Re: how to get the selected items from listbox
In order to have the selected items line up in accordance to the selection order, please do it one at a time. (That's the limit for that VI) If you need more than that (i.e. to regconize which item clicked first and which one comes later), you may have to figure it out ya :) Wish you good luck. Perhaps, someone else has a already made vi. Cheers! ian.f
RE: Hiding Main VI's Window in built application
Yonatan Tidhar [EMAIL PROTECTED] wrote: Yes I thought so, but way should the execution should be depend Were the front panel is open or not? No meter if I leave open reference to the VI I was expect that the vi execution will continue until the code ends. Simply because it is way to easy to close the top level front panel (x in top right corner of window for instance) and if an open reference, which was forgotten by the programmer, would keep the VI alive, you would end up with zombie processes. Basically it is protection of the (not so innocent) average LabVIEW programmer, who does not want to deal with proper resource deallocation once he is done with what he wanted to do. You can work around this by keeping a top level VI which starts up all the rests and gets neatly hidden by moving it off screen. Rolf Kalbermatter CIT Engineering Nederland BVtel: +31 (070) 415 9190 Treubstraat 7H fax: +31 (070) 415 9191 2288 EG Rijswijkhttp://www.citengineering.com Netherlands mailto:[EMAIL PROTECTED]
Serial instrument simulation of data
Brett, you asked on Wed, 3 Mar 2004 17:48:37 +0800: I have been working with a vi witch connects to a serial port and reads load and displacement, how can I simulate the type of data I would normally be receiving , so that I can test everything thoroughly, without actually connecting to the instrument at work. There is a peak load detection and clear indicator function as well as some front panel indicators that blink according to when a comparison has been made. Thanks in advance, any help examples in V6 would be greatly appreciated. I have been in your situation several times. There have been many different architectures for serial drivers. A key problem in all of 'em is a stage that handles messaging, say sending out messages to the device and receiving completely tested messages from the device. What I often do is coding this level driver with an USR that holds any incomplete messages for the next call. At this level you can easily insert a string constant and fill it with data captured from a test run with your real instrument. Than insert a boolean control 'demo' that defaults to FALSE. If it is true your driver should take some (random number) of characters from the string constant rather than from the device. Sometimes I also added another peace of code that could copy all chars from the device to a string display or a file in order to look what the raw data REALLY looks like. Device documentation is often not so clear or updated or exact. And debugging a running device's output stream can easily flood any system and program buffers. So with a file buffer one gets a chance to revisit the data and processing of raw data without the pushing device in the background. Greetings from Germany! -- Uwe Frenz ~ Dr. Uwe Frenz Entwicklung getemed Medizin- und Informationtechnik AG Oderstr. 59 D-14513 Teltow Tel. +49 3328 39 42 0 Fax +49 3328 39 42 99 [EMAIL PROTECTED] WWW.Getemed.de
Re: Error while getting directory details.
It's because of how you exit your smaller While loop. Your logic is set up so that if the user double-clicks on the listbox OR clicks on Save OR clicks on Cancel OR there is an error, the program exits the loop. The next piece of the program to run is dependent on the output of the Dbl-Click property - even if that isn't what the user clicked on! So in those cases you get a value of 0 from Dbl-Click and the program falls apart when it uses this 0 in the part that builds pathnames and you end up with a bad path that it then tries to tack the value of the Save As control onto. I think your program would benefit from a bit more thought about its structure. If it was based around an Event structure or a State Machine, you would be able to know exactly what the user had clicked on, rather than that they'd just clicked on *something* and be really specific about what code gets run in each case. Hope this helps, James.
Re: API Serial Functions
C. Allen Weekley [EMAIL PROTECTED] wrote: Has anyone written VI's to perform serial I/O using functions in kernel32.dll? Why would you want to do that? It's a pain in the ass, will only work under Windows and be likely a lot of work before you even can start communicating with your device. On the other hand using VISA I communicate with all sorts of devices since days and years and it has always worked for me, with the additional bonus that my LabVIEW applications work under Linux just as much without rewriting or even conditional VI code. Rolf Kalbermatter CIT Engineering Nederland BVtel: +31 (070) 415 9190 Treubstraat 7H fax: +31 (070) 415 9191 2288 EG Rijswijkhttp://www.citengineering.com Netherlands mailto:[EMAIL PROTECTED]
RE: API Serial Functions
C. Allen Weekley [EMAIL PROTECTED] wrote: Yes. My company manufactures a variety of instruments that communicate solely with serial. We have been using NI-VISA and are happy with it, but NI-VISA requires an installation that is often larger than the application we supply to our customers, and there are licensing restrictions for distribution. I was hoping to develop our own serial functions in a much smaller package than NI-VISA. This is why I am interested in using the Windows API. NI-VISA with its support for so many kinds of instruments seems like overkill for our application. When the customer installs the NI-VISA driver they end up installing features to support GPIB etc. that are not needed for our application. Well, I see. Just forget about my previous mail then, will you. I have started some work on a VISA32.DLL replacement which I intend to release as Open-G VISA library. It is far from complete and I have only worked on Windows yet but intend to actually push the Linux version more. It is structured similar as NI-VISA with VISA32.DLL as top level API and low level plugin DLLs which provide support for particular VISA resource types. The first I have started with is serial of course, but it is as I said not functional at all yet. I still need some common infrastructure libraries as well. I was intending to get something working before putting it out, but it is geoing slow and it will take quite some time before I get there. If you would be interested in working on that as well I could create an Open-G subproject and put up what I have so far so that you could take a look at it and work yourself on it as well. Rolf Kalbermatter CIT Engineering Nederland BVtel: +31 (070) 415 9190 Treubstraat 7H fax: +31 (070) 415 9191 2288 EG Rijswijkhttp://www.citengineering.com Netherlands mailto:[EMAIL PROTECTED]
Re: Language Independence on Serial Output of .
Holland, Guy [EMAIL PROTECTED] wrote: I have an application that outputs a string with numbers via the serial port. Ex. SG1.23,4.56,7.89. I developed the application in English but when the application was installed onto a Non-English say Holland language, the output string turns into SG1,23,4,56,7,89. The periods are replaced with commas. I believe it might happen with all languages that use commas ($1,00) rather than periods ($1.00). How can I get around this problem so that my application can be language independent? You have a couple of options: 1) Change the International Settings in your Control Panel (will affaect all applications on that computer) 2) Change the LabVIEW global settings (disable Options-Misc-Use localized decimal point) (This will affect all string formatting functions in your application. You can also add the according setting useLocalizedDecimalPoint=False to your application INI file.) 3) Define with each formatting command what format to use by prepending following: %.; use decimal point %,; use decimal comma This is great information. I think I will have to use both yours and Richard Mahoney's advice. Your suggestion will work for the mean time but I think the solution is to use Richard's format specifier %.; suggestion. Actually, I think the ultimate solution would be for NI to transparently do this formatting so I don't have to. If I send a . why would I want it to be anything else other than a .? Not sure what you mean. Mind reading software hasn't been developed yet ;-) Rolf Kalbermatter CIT Engineering Nederland BVtel: +31 (070) 415 9190 Treubstraat 7H fax: +31 (070) 415 9191 2288 EG Rijswijkhttp://www.citengineering.com Netherlands mailto:[EMAIL PROTECTED]
Time delay in while loops
I am using a while loop with a task in it involving the serial port. I only want the task in the loop to run for a certain amount of time (~10s). I have tried putting the 'wait' function in but this doesn't seem to work. Does anyone know what would work best. Thanks
Re: Error while getting directory details.
Ah yes, the property value is -1, not zero like I said. I knew I should have had that extra hour in bed! :)
How to create a 'circular' 30 day file in LabVIEW....
--7250537.1078830524114.JavaMail.quiq.tekken Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit How do I create a 30-day circular data (text) file in LabVIEW, the file will contain data including the date for 30 days worth, then on day 31, day 1 will be erased and day 31 shall be appended to the file, on Day 32, day 2 shall be erased and day 32 appended to file. Therefore file will be updated each day after 30 days, but will only contain 30 days worth of data. Your help is greatly appreciated. I have attached some sample data (.csv file). Regards, Saj --7250537.1078830524114.JavaMail.quiq.tekken Content-Type: text/comma-separated-values; name=Results.csv Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=Results.csv Content-Description: Sample Data File (.csv) Machine_ID:,Wheelco Item:,item1 Tracking_No:,tr1 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,0.00,0.00 2,0.00,0.00 Machine_ID:,Wheelco Item:,item1 Tracking_No:,tr1 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,0.00,0.00 Machine_ID:,WHEELCO Item:,4 Tracking_No:,0 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-9.94,2.28 2,-3.89,1.79 3,-5.92,3.42 Machine_ID:,WHEELCO Item:,M Tracking_No:,2 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-9.44,1.96 2,-1.28,2.94 Machine_ID:,WHEELCO Item:,L Tracking_No:,L Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-0.68,2.20 2,3.42,2.45 3,-4.08,1.79 4,-1.05,1.79 Machine_ID:,WHEELCO Item:,P Tracking_No:,P Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-2.46,1.79 Machine_ID:,WHEELCO Item:,O Tracking_No:,P Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,4.44,3.42 Machine_ID:,WHEELCO Item:,TS Tracking_No:,G Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-2.79,2.94 2,-4.22,3.34 Machine_ID:,WHEELCO Item:,KK Tracking_No:,GGG Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,5.48,2.85 Machine_ID:,WHEELCO Item:,9207-50031 Tracking_No:,769057002 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,9.88,1.88 2,8.00,1.79 Machine_ID:,WHEELCO Item:,9207-50031 Tracking_No:,769057002 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,10.37,2.04 2,6.24,1.63 Machine_ID:,WHEELCO Item:,9207-50031 Tracking_No:,769057002 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-0.03,1.96 Machine_ID:,WHEELCO Item:,POP Tracking_No:,POPI Date:,05/02/2004 Belt_No:,Mean_Value:,Range:, 1,NaN,0.00 Machine_ID:,WHEELCO Item:,L Tracking_No:,Z Date:,05/02/2004 Belt_No:,Mean_Value:,Range:, 1,-0.12,0.29 Machine_ID:,WHEELCO Item:,L Tracking_No:,U Date:,05/02/2004 Belt_No:,Mean_Value:,Range:, 1,-0.12,0.29 Machine_ID:,WHEELCO Item:,O Tracking_No:,V Date:,05/02/2004 Belt_No:,Mean_Value:,Range:, 1,-0.12,0.29 ,0.00,0.00 Machine_ID:, Item:, Tracking_No:, Date:,08/03/2004 Belt_No:,Mean_Value:,Range:, 1,0.00,0.00 --7250537.1078830524114.JavaMail.quiq.tekken--
How to create a 'circular' 30 day file in LabVIEW. the file...
--2799187.1078830524917.JavaMail.quiq.tekken Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit How to create a 'circular' 30 day file in LabVIEW. the file will contain data including the date for 30 days worth, then on day 31, day 1 will be erased etc... How do I create a 30-day circular data (text) file in LabVIEW, the file will contain data including the date for 30 days worth, then on day 31, day 1 will be erased and day 31 shall be appended to the file, on Day 32, day 2 shall be erased and day 32 appended to file etc... Therefore file will be updated each day after 30 days, but will only contain 30 days worth of data. Your help is greatly appreciated. I have attached some sample data (.csv file). Regards, Saj --2799187.1078830524917.JavaMail.quiq.tekken Content-Type: text/comma-separated-values; name=Results.csv Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=Results.csv Content-Description: Sample Data File (.csv) Machine_ID:,Wheelco Item:,item1 Tracking_No:,tr1 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,0.00,0.00 2,0.00,0.00 Machine_ID:,Wheelco Item:,item1 Tracking_No:,tr1 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,0.00,0.00 Machine_ID:,WHEELCO Item:,4 Tracking_No:,0 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-9.94,2.28 2,-3.89,1.79 3,-5.92,3.42 Machine_ID:,WHEELCO Item:,M Tracking_No:,2 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-9.44,1.96 2,-1.28,2.94 Machine_ID:,WHEELCO Item:,L Tracking_No:,L Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-0.68,2.20 2,3.42,2.45 3,-4.08,1.79 4,-1.05,1.79 Machine_ID:,WHEELCO Item:,P Tracking_No:,P Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-2.46,1.79 Machine_ID:,WHEELCO Item:,O Tracking_No:,P Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,4.44,3.42 Machine_ID:,WHEELCO Item:,TS Tracking_No:,G Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-2.79,2.94 2,-4.22,3.34 Machine_ID:,WHEELCO Item:,KK Tracking_No:,GGG Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,5.48,2.85 Machine_ID:,WHEELCO Item:,9207-50031 Tracking_No:,769057002 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,9.88,1.88 2,8.00,1.79 Machine_ID:,WHEELCO Item:,9207-50031 Tracking_No:,769057002 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,10.37,2.04 2,6.24,1.63 Machine_ID:,WHEELCO Item:,9207-50031 Tracking_No:,769057002 Date:,22/01/2004 Belt_No:,Mean_Value:,Range:, 1,-0.03,1.96 Machine_ID:,WHEELCO Item:,POP Tracking_No:,POPI Date:,05/02/2004 Belt_No:,Mean_Value:,Range:, 1,NaN,0.00 Machine_ID:,WHEELCO Item:,L Tracking_No:,Z Date:,05/02/2004 Belt_No:,Mean_Value:,Range:, 1,-0.12,0.29 Machine_ID:,WHEELCO Item:,L Tracking_No:,U Date:,05/02/2004 Belt_No:,Mean_Value:,Range:, 1,-0.12,0.29 Machine_ID:,WHEELCO Item:,O Tracking_No:,V Date:,05/02/2004 Belt_No:,Mean_Value:,Range:, 1,-0.12,0.29 ,0.00,0.00 Machine_ID:, Item:, Tracking_No:, Date:,08/03/2004 Belt_No:,Mean_Value:,Range:, 1,0.00,0.00 --2799187.1078830524917.JavaMail.quiq.tekken--
Re: How to set the correct time scale of VI ?
Change the Scaling factors to 2004 or whatever date you want which is under X Scale formatting option.
Re: clearing the cursor legend programatically
Problem solved. Thanks for the help. Bert
Re: Extract value in last cell of spreadsheet Excell
Is this number special in any way , ie , the highest or lowest number or unique in some way to the rest of the data ? If so,this should this will be very easy to do.
Re: backward compatibility problem V6.1 - V7
Could you post an example? I switch back and forth between LV 6.1 and 7 regularly and I have not experienced any issues. I have even used LV7 to invoke a LV 6 VI and all of the clusters worked fine. I do beleive there was a change to the Waveform data type and of course the new time format. Trying to help, Ben a href=http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101RPAGEID=261HRedirected=TrueHUserId=101_3529RFORMNUMBER=6;Ben Rayner/a a href= http://volt.ni.com/niwc/common.jsp?page=products_certification_cldnode=10638; Certified LabVIEW Developer /a www.DSAutomation.com Why do I feel like I am talking to myself?
Re: How to create a 'circular' 30 day file in LabVIEW. the file...
If the file is as small as your example, or even if it's several times bigger, I would just read the whole file into a string, convert it to a string array using Spreadsheet String to Array, use the array functions to strip off the unwanted data and append the new data, then convert and write the whole file out again. If it's megabytes in size but you have plenty of spare disc space, you could read the file in one line or block of lines at a time until you reach the start of the part you want to keep, then open a new file and start writing the lines/blocks out to the new file as you read them in, then append the new data, then delete the old file and rename the new one you have created. There may be a better solution in this case, but this will certainly work. I would be interested in others' comments though, because I once wanted to maintain a rolling buffer like this for audio data (i.e. a much faster data rate) and I didn't find any simple solutions on offer.
Re: How to connect front panel items as before?
Aaaarrghhh! Just my opinion of the auto-tool selection. Ben
Re: How to connect front panel items as before?
Thanks, I have tolerated the auto selection tool but find myself hitting the space and the tab constantly. I agree that it can be handy. Yet often it is like dragging fingernails across a chalkboard.
Re: Changing the brightness and contrast of an image displayed in a picture control
Pretty much, yes. If you want to play around with image analysis, have a look at the free ImageTool software from http://ddsdx.uthscsa.edu/dig/itdesc.html - the brightness contrast adjustment tool in this program illustrates the idea very neatly. (Mac users of course should get NIH Image from http://rsb.info.nih.gov/nih-image/ )
Re: Dialog color that matches tab in the XP theme too
What is the 01 in the upper byte for? I did not know that was used for anything. Ben
I need to defend Labview from some co-workers previous experience.
I had a co-worker state the following Labview does not have revision control nor compile function, which are essential for a multi-site utilization. Is this true? How do I defend Labview to ensure him that Labview will work for our application? He based his comments on Labview 5 years ago. What version was he using?
Re: Dialog color that matches tab in the XP theme too
What is the 01 in the upper byte for? I did not know that was used for anything. The color format is xxrrggbb where xx means the uppers are reserved. If xx is 00, then the lowers form the 24 bit rgb value. If nonzero, then something else is going on and either the color is invalid or it has a symbolic meaning, which is what the 01 indicates. And the other upper byte values are still reserved for future use, like alpha channel for example. Anyway, 01yy means we can have 2^24 symbolic colors, and so far Apple and MS have used about fifty and the most common six are in the color picker. Greg Mckaskle
Re: VI Link
Ich habs mir gerade noch einmal angeschaut. Wenn man das xy_Test.vi mit einem Texteditor l=E4d steht eindeutig ein Verweis auf Setup.vi drin. Nur voher der kommt und wie man in weg krieg...R=E4tsel Vielleicht weiss ja Waldemar noch eine L=F6sung.
Re: How to connect front panel items as before?
Thanks, I have tolerated the auto selection tool but find myself hitting the space and the tab constantly. I agree that it can be handy. Yet often it is like dragging fingernails across a chalkboard. The analogy I use at work is that when purchasing a car, some people buy an automatic transmission, some buy a standard. Some people are lost without their choice, and some can switch effortlessly between them. Luckily you bought a car (LV) with both. The switch for choosing is in the ToolsOptions dialog, and if you have it set for auto, you can shift-right click or use the palette to get to the manual ones temporarily, then shift tab to get back to auto. Just a tab may work also. Anyway, it is left up to the consumer to decide which they want to use. Also, if you have suggestions about how to make the automatic less clumsy, please suggest them on the web site. Greg McKaskle
RE: API Serial Functions
I am interested in having the capability (of not using VISA) for the same reasons as you. Please let me know if you are able to find a substitute for the VISA serial functions. Yes. My company manufactures a variety of instruments that communicate solely with serial. We have been using NI-VISA and are happy with it, but NI-VISA requires an installation that is often larger than the application we supply to our customers, and there are licensing restrictions for distribution. I was hoping to develop our own serial functions in a much smaller package than NI-VISA. This is why I am interested in using the Windows API. NI-VISA with its support for so many kinds of instruments seems like overkill for our application. When the customer installs the NI-VISA driver they end up installing features to support GPIB etc. that are not needed for our application. Allen Lewis Drake Process Automation Corporation Belle Mead, NJ 908 359-1011 www.processauto.com
TCP/IP driven event / Interrupt
Hi all, I thought about a better way of detecting the change of a value of a data socket connectin (OPC) than a loop with 50ms delay which continually polls the opc-server. Is there a way in LV to react on events which are not induced by a frontpanel input but by a change of a value of a data socket connection? Or is there another way to react on a change of a value of a data socket connection like an interrupt? Best Regards, Toni
Re: I need to defend Labview from some co-workers previous experience.
I went through the same thing were I work at. All the programmers here work with visual basic 6. .NET and visual C++ to do a lot of hard core coding simply because they have been doing it for years. I am the lab manger here now and i purchased Labview 7 express. Now when it comes to building test for production and other projects they come to me because i can do them faster in labview than they can in any form of coding. do this find something simple that you can do in labview (ie connect to GPIB) have your coworker do the same and see who gets done faster with same results. HAHAHAHA you'll be drinking coffee for at least 30 min. before he does. god bless have fun (Isn't this exciting)
Re: I need to defend Labview from some co-workers previous experience.
Ok here we go I think you will get alot of replies but I guess I will start 1. LabVIEW does have source code control and can integrate with probably one of the most powerful source code control programs Visual Source Safe by Microsoft. 2. As far as revision history, there is a setting to enable a popup window to enter comments every time the vi is saved, closed, etc. This revision history is kept on a vi basis. So the history goes wherever the vi goes. 3. LabVIEW does its own compliling and doesn't burden the user with the problems of syntax. Ask your co worker how easy it is to make a window with 3 buttons? Actually ask them how long it will take? Compare it to LV and there should be the real answer. 4. So far I have not found 1 think that LV cannot do that C++ can. The biggest benefit is the development time or lack of development time when in LV. I am just opening the can of worms I am sure others will reply and pick up where I left off. By the way I started as a C++ and Assembly programmer... :)
Re: Does LabVIEW support Shared Memory File created by VC++?
--1813850.1078843123492.JavaMail.quiq.tekken
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
I am having trouble trying to do this also. I have a c++ program that
is creating and writing to a shared memory location. I know that it
is working correctly becuase i read off that memory with several other
apps. I tried writing a dll with the same read code, but Labview
Crashes Everytime I run it.
Attached is a simple dll example i tried to trys to read one element
out of and array.(The arrays has 40 elements.) Anyone have any
suggestions? (This is just the read mind you.)
--1813850.1078843123492.JavaMail.quiq.tekken
Content-Type: text/plain; name=sharedmemopen.txt
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename=sharedmemopen.txt
Content-Description: dll code for labview
#incl/* Call Library source file */
#include extcode.h
#include cvilvsb.h
#include fundtypes.h
#include hosttype.h
#include platdefines.h
#include windows.h
#include fcntl.h
#include sys/types.h
#include stdio.h
#include process.h
#include memory.h
extern C{
_declspec(dllexport) void SharedMemoryInit(float *x1);}
_declspec(dllexport) void SharedMemoryInit(float *x1)
{
HANDLE hMapObject;
float *MapView;
//share memory file init
hMapObject=OpenFileMapping(FILE_MAP_ALL_ACCESS,FALSE,rstk_shared_memory);
MapView=(float*)MapViewOfFileEx(hMapObject,FILE_MAP_ALL_ACCESS,0,0,0,0);
*x1=MapView[3];
}
--1813850.1078843123492.JavaMail.quiq.tekken--
Removing duplicates from string
I have a string of comma delimited characters and I want to search and remove any duplicate strings (i.e. John,Sally,Joe,John,Fred,John to John,Sally,Joe,Fred). What is the easiest way to do this with LabVIEW? Has something already been written that will do this?
Re: Errormessage, please help explain
The most likely cause of that error is calling a function in a DLL with the incorrect number of parameters. Too many or too few parameters can mess things up quite well (trust me on this one - been there, done that). Usually, no damage is done. Check the function in your DLL and reproduce the parameter structure EXACTLY. Rob
Re: Fatal internal error:memory.cpp,line 593
typedef struct {
long dimSizes[2];
double Numeric[1];
} TD8;
typedef TD8 **TD8Hdl;
TD8Hdl *spec_map;
DSSetHandleSize(*spec_map, sizeof(int32)*2 + 100*10*sizeof(double) );
Greg could you please explain what is wrong with this because i am
still getting an exception error.
Re: I need to defend Labview from some co-workers previous experience.
Five years ago, LabVIEW did have source code control and the ability to create executables but only if you bought the professional version. I use Visual Source Safe for my revision control and I'm not that familiar with LabVIEW's built-in one. The application builder is and was available separately but it' worth buying the pro version because then you also get the diff tool to compare either VI's or hierarchies.
Re: How to create a 'circular' 30 day file in LabVIEW. the file...
I would be interested in others' comments though, because I once wanted to maintain a rolling buffer like this for audio data (i.e. a much faster data rate) and I didn't find any simple solutions on offer. I didn't look too close at the sample data, but it is possible to use random access and do this without copying the contents of the file. If the data collected over a day is fixed size or bounded, lets say that it fits in 1MB, then you right up front make your file contain 30 1MB chunks. To read in a given day, you compute where in the file it will be, then read 1MB of info, which could be one record, N elements of an array, a flattened string, or N lines in a text file, just as long as you know what it takes to read the day's 1MB of info. To overwrite a day, you seek to the same spot and do a write that corresponds to the read's parameters. If you can't compute the position in the file without additional info, you place a header record either at the front or end of the file and put the info you need in there, even a full table of contents stating which date is in which record. To use the header, you first read the header record, then compute the location (adding the header size to the position), then do the read or write like before. And if the data isn't fixed or bounded, you can do this more generally by putting more info in the table of contents such as an array of record locations and putting more than 30 records in the file. When a day is overwritten, you first overwrite the records belonging to that day, then append to the end of the file. If the new record is smaller than the old one, you add the records to the Available list in the table of contents. If the table of contents is no longer fixed size, you store it at the end of the file and possibly relocate it each time the file is updated. Anyway, my point is that file I/O can be very efficient with the right approach, but it takes a bit of thought and some programming to achieve it, which is why with small files your suggestion is right on the money. But when the files get large enough, play with the seek and offset fields on the file I/O blocks and you can make almost anything out of them. Greg McKaskle
Re: Extract value in last cell of spreadsheet Excell
The last row of the spreadsheet can vary from 01 to x hundreds or x thousands and it is not possible to know it in advance, but when I intend to work on the spreadsheet, the spreadsheet is created for some days and is present on the computer.
Re: I need to defend Labview from some co-workers previous experience.
Labview does not have revision control nor compile function, which are essential for a multi-site utilization. Is this true? There are more detailed documents on the NI site. You might want search there and forward the links to the coworker. The short answer is that LV is compatible with numerous revision control systems, Source Safe, Perforce, etc. If you purchase the professional edition, the revision control will be somewhat more integrated into the LV menus, but you can use the revision control client app without this. All LV VIs are compiled, but I don't know what is meant by having a compile function. Perhaps the Dr. VI article on the LV compiler will answer his question, or perhaps he wants a make system. And of course, feel free to ask more detailed questions or have him post the questions here directly. LV has been used for quite large projects, and often hearing of other people's usage is better than an analytical listing of features. Greg McKaskle
RE: Detecting Lurking VIs
LabVIEWers, Prodded by Dan Bookwalter and assured by Rolf Kalbermatter that I was not overlooking the obvious, I have upgraded Ghost Buster to launch different code for different versions of LabVIEW. The new release warns of minimized VIs in LabVIEW 7 and up. Visit http://www.sullutions.com/LabVIEW.html to read about the improvements and download the new version (royalty free for personal or company internal use). In LabVIEW 7.0 on my Mac, the launcher stays in memory, even though I think I have killed all references to it. In 6.02 and 6.1, the launcher leaves as soon as Ghost Buster 6 is running, as I expect. If you know what I am doing wrong, please let me know and I'll fix it in the next version. -- EnWirementally, Paul F. Sullivan SULLutions (781)769-6869 when a single discipline is not enough visit http://www.SULLutions.com
How to save output image after IMAQ-FFT to the file
When I apply IMAQ FFT on monochromatic image and display complex destination image by IMAQ WindDraw, I get picture which I am not able to save to the file. I tried various conversions from complex image to bitmap (array), but result was everytime different from that got by IMAQ WindDraw. I thank for any help.
Re: Extract value in last cell of spreadsheet Excell
You can use the UsedRange property of excel. This will give you the last cell used in your excel worksheet.
Re: Removing duplicates from string
I would transfer the whole list in an array, sort it compare each item with the item before, if it is equal than delete it.
Re: Dialog color that matches tab in the XP theme too
We got away from using system colours on all of our GUIs for just this reason. Explicitly stated colours allow us to have a consistent looking GUI on whatever OS. Might be an idea so that whatever scheme the OS producers come up with, the GUI will still be usable. BTW, we had some comments in the code with system colurs and they disappeared against the background on Windoze XP. Rob
Re: I need to defend Labview from some co-workers previous experience.
Five years ago that should have been LabVIEW 4 or 5. But then, as we've seen here, some people keep versions around forever. I have always worked with the professional packages, so I've always had access to compilers for LabVIEW. Where I work now, we use Perforce for revision control. It works great. I've also used Visual Source Safe and I'll stick to Perforce, thanks. You can even set the client to automatically sign out the code if you change to edit mode on the diagram. AS others have said - LabVIEW excels at equipment connectivity. An example from my past: a C programmer had spent 2.5 days building a terminal type of program to talk to our equipment. He gave me the DLL that he was using for communications and watched as I built the same program in LabVIEW and completed in 15 minutes. His comment was that he was probably going to be relegated to supporting the old code while I made the new code and for the most part he was right. Rob
Dlls working fine in LabVIEW 6.1 dont do so in LabVIEW 7.0
We are using the following dlls from Microstar Labs for one of our Microstar DSP boards : a. DAPIO32.dll : DAPcell client I/O library b. Diostub.dll We use these in the main Vi called DAPControl.vi We currently run this VI in LV 6.1 - its working fine for the last several months. When we open this VI in LV 7.0 the VI loads (i.e. there is no problem reported by LV as far any subvi/dll is concerned), but during run time it gives an error. Specifically the Function DAPLinePut does not work - when trying to input offset values set display.
Re: create all combinations elements 1D array of cluster of arrays
Could you please post the input structure. I am not quite sure if I understand what you want. Chris
indicator not updating from global file on network
A labview program is running locally but accessing a global variable on a shared network. If I view the diagram with the lightbulb turned on, the variable value on the diagram is changing, but the variable value on the front panel does not change. Any suggestions?
How I pass a cluster with array of various data type (double, I32, string)
I have to pass from a VI to a Microsoft Visual C++ DLL, a cluster with
some arrays of various data type. The problem is with Double array,
that during Visual C debug is incorrect:the dimension is correct
passed, but not array data. In the DLL I have inserted the C code
genereted by LabVIEW. I tried to pass a cluster of only one array of
double, and the results is the same. Then, I tried to pass a cluster
with scalar number and the result is correct in only one case. If the
double data is the first in the cluster, the result is correct; if the
first is another data type, such as integer or boolean, the double
data is incorrect during the debug of the DLL.
This is the code of my DLL:
// LabViewParam.cpp : Defines the entry point for the DLL application.
//
#include stdafx.h
#include LabViewParam.h
#include extcode.h
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
typedef struct {
long dimSize;
double elt[1];
} TD2;
typedef TD2 **TD2Hdl;
typedef struct {
TD2Hdl elt1;
} TD1;
// This is an example of an exported variable
LABVIEWPARAM_API int nLabViewParamPass=0;
// This is an example of an exported function.
LABVIEWPARAM_API int LabViewParamPass(TD1 *pparam)
{
double parametro;
int i;
for (i=0;i(**(*pparam).elt1).dimSize;i++)
{
parametro=(**(*pparam).elt1).elt[i];
}
return 42;
}
// This is the constructor of a class that has been exported.
// see LabViewParam.h for the class definition
CLabViewParam::CLabViewParam()
{
return;
}
I use LabVIEW 7.0 and Windows XP.
Sorry for my english.
Thanks to every one for your suggestions.
Filippo
control exe from labview
I was wondering is there a way that I can run and pass parameters to exe file from the labview program. If yes then please enlighten me.. In anticipation of reply cheers Priiyank
Re: How do you clone propety nodes?
Great, Thanks! (Wish I would have asked this one a long time ago!)
What to install for office/desktop use only?
I'd like to write Labview programs on my desktop, which does\will not have any DAQ hardware attached to it. Therefore, I think I do not have to choose 'complete installation', but I do not know what components to leave out. Any advice?
Re: create all combinations elements 1D array of cluster of arrays
Thanks for even looking at my vague question. Basically, what I am trying to do is create all possible combinations of values of data from different sets. Let's say I have set1 contains the values 1,2,3,4 set2 contains the values a,b,c,d set3 contains the values A,B,C,D set4 contains the values X,Y,Z My desired output, all combinations of the above sets, is a set of data with the values: 1aAX 1aAY 1aAZ 1aBX 1aBY 1aBZ .. 1aDZ .. 1bAX 1bAY .. 4dDZ I want to write code that can handle any # of sets of any size each. I think I have figured out a way to do this. (After giving up at work last night, it came to me while falling asleep.) I am sort of flattening the data by treating everything (even if #s) as a string, and merely concatenating the combinations exactly as shown above. (Well, I have to do this repeatedly -- I'm still working on the code for that.) That way, my output data retains the same dimensionality (1D, that is) regardless of the # of sets or their size. I'll let you know if I fail at this, but I think I am on the right track now.
Prompting user input in LabVIEW
We've written a number of VIs that require user input, and we'd like for the user to be able to begin typing right away, rather than having to use the mouse or the Tab key to move the cursor to the first text field. What's a good way of doing this? Thank you very much. -Dan
Re: when I press install in the autorun page it doesn't work
college student, In this case it would be really helpful to know which operating system you are attempting to install LabVIEW on. Make sure that you are installing your LabVIEW CD on a compatible operating system. You may also navigate to the setup.exe file on the CD itself. You will want to open a file browser and open the LabVIEW CD within the file browser to find setup.exe. You can also click on =91Explore CD=92 link on the autorun page, navigate to the setup.exe file, and run it. If you are still having problems please post back with more detail on the system you are attempting to install LabVIEW on (OS, LabVIEW version, etc.) Good luck! Craig H. National Instruments
Is there a LabView(6.1) VI for Hameg HM 8130 serial interface
HM 8130 is a function generator
Re: Vi Text Modification?
Just change the foreground and background colors of the indicator to transparent. With the brush tool, right click on the indicator. In the pop-up, select T for transparent. If necessary, use the space bar to switch between foreground and background to change both. jpo [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Hi I am looking for some direction in how to modify the appearance of a string indicator in my vi's front panel. I would like to remove the rectangular box that surrounds the text to make it appear as it is a just regular text on the front panel. The reason I want to do this is that I would like be able to modify the text and its position dynamically in the program. Thanks John
Re: Can't control the HP3325b (error code:Hex:BFFA0010)
MusicLive, Sorry for the long delay! You can make sure that LabVIEW is using the instrument driver correctly before you even connect it to your device. Specifically in the Getting Started.vi you can set the simulate field equal to one in the options string of this VI. Below is a great tutorial that should get you started using this IVI driver. I wish you the best of luck! Let me know if you need any more assistance with this issue. http://zone.ni.com/devzone/conceptd.nsf/webmain/d839bfb01c77d8ca86256a450063e9b0?OpenDocument Shea Clymer Applications Engineer
collect and buffer position information from sinusoidal encoder
I need hardware that would allow me to collect and buffer, then display, position data from a encoder with a sinusoidal output.
Re: Who used Protection Plus system?
Hello - Are you trying to use the Protection Plus System to protect an application built out of LabVIEW? If that is the case, a href=http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101RPAGEID=135HOID=50650008000E1BUCATEGORY_0=_49_%24_6_UCATEGORY_S=0USEARCHCONTEXT_QUESTION_0=protection+plusUSEARCHCONTEXT_QUESTION_S=0;this/a discussion forum post provides a few suggestions for protection methods. As for specific use of the Protection Plus System, I am not aware of anyone in office who has tested with that. Hopefully another customer will reply. Good luck with your project. Have a great day! Becky B. Applications Engineer National Instruments
Re: indicator not updating from global file on network
If you set the vi property-execution to user interface, it may help Right click on the vi icon, select vi properties execution- preffered execution system
Re: Is there a LabView(6.1) VI for Hameg HM 8130 serial interface
Yes there is. The driver is available A href=http://zone.ni.com/idnet97.nsf/9b2b33e1993d877786256436006ec498/ce4b7203e9468141862568ab005fbb1e?OpenDocument;here/A. For future reference, the A href=http://www.ni.com/devzone/idnet/;Instrument Driver Network/A is the place to start searching for drivers.
Re: Error code -2146827284 when trying to programmatically...
Hello Gavin, You are probably getting this error because you are trying to access cells outside the maximum range in Excel. A Microsoft Excel spreadsheet is limited to 256 columns and 65,536 rows. This a href=3Dhttp://digital.ni.com/public.nsf/websearch/23EF6DD43866726C86256D5C0= 0687E51?OpenDocumentKnowledge Base/a has further information. If you are interested in a more robust data tool for managing, inspecting, analyzing and reporting test Data, check out a href=3Dhttp://sine.ni.com/apps/we/nioc.vp?cid=3D5050lang=3DUSDIAdem/a. It can handle data sets with over 1 billion values. If none of these suggestions help, or if I=92m not correctly understanding your issue, please post the software and versions you are using, the applicable portions of your code, and any other information that may help, and I=92ll be happy to look further into it. Have a nice day! Robert M Applications Engineer National Instruments
How do you keep track of a series of elapsed times in an array or file?
I have a digital output that turns on and off for different periods of time. I am using the elapled time function to measure the time it is on and I need to store this time value in an array or in a file whenever the output goes off. I am having trouble getting my program to store the value, does anyone have any ideas?
Re: Understanding the Pattern-Matching algorithm
Most likely the failure is due to the fact that the pattern is faint and there is a lot of noise which blurs the pattern even more. For more detailed information on the Pattern Matching algorithm, take a look at the following resources. How to Match Patterns or Shapes in IMAQ Vision? http://digital.ni.com/public.nsf/websearch/862567530005F09C86256754005ED3D8 IMAQ Vision for LabVIEW User Manual, page 5-17: http://digital.ni.com/manuals.nsf/websearch/CDEE235576535B2586256D3C005FBC98?OpenDocumentnode=132090_US IMAQ Vision Concepts Manual, chapter 12 http://digital.ni.com/manuals.nsf/websearch/55A90080787F932586256D3C0065F4DA?OpenDocumentnode=132090_US Hope this helps - Julie S Applications Engineer National Instruments
Re: Prompting user input in LabVIEW
Use the Key Focus property to set the focus on the input string. The input string will be automatically selected
running exe files in labview (or alternatives)
I am currently trying to make LabVIEW communicate with a DT3155 frame grabber. It reads exe files programmed in c. I initially wanted to call the dll libraries of the frame grabber and rewrite the code into sub-VI's, but then realized it would be much too big for me to make. Is there any way to call on exe files in LabVIEW, so that I can run a program whenever I wanted to perform a function? And if not, what other options can I consider utilizing? Sorry if this question is too basic, I'm just starting to learn LabVIEW. Thanks in advance for any help you guys can offer to me. ~Josh
How to manage different instrument models with one driver?
Hi, I have a driver already developed for an instrument and want to incorporate another model into it. These instruments have the nearly the same instruction set except one is a subset of the other. I would like to know the standard way or the NI way of combining these drivers. Is there a way of storing global data? I'm using LabView 6.0. Thanks in advance.
Re: How to put signal in spreadsheet
Ann - The VIs you mentioned are not provided by NI, but they do sound like they use functions from the NI-IMAQ driver, which is used with National Instruments image acquisition boards. If you have the IMAQ Vision software, it will be very easy to take the average signal of the images. Here is an example program that will do this for you: IMAQ Running Average in LabVIEW: http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=BCF19BC556AA1487E034080020E74861p_node=DZ52511p_source=External There are also examples that are shipped with LabVIEW and the IMAQ driver to acquire and save images. They are located in the folder C:\Program Files\National Instruments\LabVIEW\examples\IMAQ . Hope this helps- Julie S Applications Engineer National Instruments
Re: Fire an Event automaticaly
I agree that always was a little strong. There are many instances where the timeout could be avoided. However, in my experience it is good practice to include the timeout in most instances as it eliminates the possibility that you get stuck endlessly waiting for an event to occur and you don't want to trigger an event. Certainly with proper programming techniques this problem can be avoided (the event could include the front panel stop button, e.g.), but since most event structures are already in a loop so that they can handle more than one event, including an empty timeout event results in very little overhead. I can think of few instances where the timeout event is detrimental.
Re: Dialog color that matches tab in the XP theme too
Thanks Greg! The color I was looking for is 16777271, works as expected (the color picker just shows it as black though). Can we have more system colors on the palette next time...?:-)
Re: Need help hooking up Omega Vacuum Sensor?
HolzschuM, You will find wiring information as well as other configuration info at the a href=http://www.ni.com/pdf/products/us/4daqsc253-265_194-196.pdfSCC Configuration Guide/a. Here is another link that discusses how to configure the a href=http://www.ni.com/pdf/products/us/4daqsc251-52_266-69_194-96.pdfSC-2345 Carrier/a. If these resources fail to address your concern please post back with more details (which feed-through module you are using, etc.) Good luck! Craig H. National Instruments
Re: Vi Text Modification?
The answer to your question is in my answer to the original post. If you right click on the board with the color tool, you'll see the box in the lower left corner with two different colors. One is grey and the other has a T in it? These are the foreground and background colors of the border (I don't know which is which). The T box has a white line around it. This is the one that's currently selected. If you hit the space bar once, the white box disappears and you can apply the selected color to both foreground and background. Hit the space bar again, and the white box moves to the left around the grey. The selected color will then apply only to that area.
Read Key(String).vi and spaces
Hello all, I am having some trouble with the Read Key(String).vi. One of the strings I am reading in ends in spaces. This vi seems to want to truncate any trailing spaces. I don't want it to do that. Is there anyway of modifing the vi to not truncate spaces? Or should I not allow spaces to be written? Thanks in advance, Glen
why do i see negative peaks when reading for bragg...
why do i see negative peaks when reading for bragg wavelengths from a photodetector using a A/D indicators? i dont understand why i see negative peaks on my A/D indicator when i use it to read bragg wavelengths from a photodetector for voltage vs time, yet no negative peaks will appear for a waveform graph, can anyone explain? what exactly is this A/D value representing? thnks
Re: Error while getting directory details.
Thanks for your help.It worked fine.
Re: Changing the brightness and contrast of an image displayed in a picture control
THanks for the link I will chase it down. I did mention that this topic interests me and did not claim to be an expert, didn't I? Thank tmh! Ben
binary data from serial port?
I want to be able to read binary data from a serial port using labview. The packets are of known length (in even bytes) but they are not ascii. I am worried that if i read them as ascii first and then try to convert, there will be problems such as with special characters appearing
Re: Dialog color that matches tab in the XP theme too
We used to do that ourselves; but at a point we decided that it looked better to follow the windows theme. It takes some time to ensure that it looks OK on the most common themes, but it makes things look more native for the users.
Re: Dialog color that matches tab in the XP theme too
I've overlooked the dialog label(!)...in this case we haven't used separate labels so the coloring Greg helped with was nice to get, but I'll use the dialog label in the future.
Re: I want an appended array (of Strings) to write to an excel file.
There are two things that need to be fixed. 1. You state that you are using the Write Character to spreadsheet, but your code shows the write to spreadsheet file which requires an array of numbers. You need to replace it with the Write Characters to File which will take only a single string. 2. Insert Array to Spreadsheet String to convert the array of strings into a single string. Specify a format of %s. Michael Munroe Certified LabVIEW Developer ABCDEF
Re: Common Dialog Activex control not loading
Wiebe, yes the problem was pretty persistent even on executables generated by the App builder. Still not totally happy with the solution!
Re: Read Key(String).vi and spaces
I haven't dug very far into the config file VIs but the easiest thing to do is to enclose all of your strings with quote marks (). If you do that, key values with trailing spaces are read correctly.
How to reset the main front panel?
Hi all, My program contains many subvis and loops controlled by buttons in my mainVI. Some of the subvis are use as display panel that will show results. My Qn is this: Is there any way that by pressing a button on my mainvi, i reset the FP of my mainvi and close the subvi? thanks. further info: my mainvi FP contains some output string data, buttons, enum buttons, and all this must be reset to default value.
creating a LabView VI from LabWindows application
What is the process of turning a LabWindows application into LabView VI.
1000 Responses
I just wanted to congratulate Ben. I understand he just passed the 1000 mark. His responses are always helpful and well thought out. If you make it to NIWeek, be sure to introduce yourself, or maybe the enthusiasts should wear a special hat or something -- with a propellor or blinking LEDs. Anyway, congratulations and thanks for your time and effort. Greg McKaskle
Re: Fatal internal error:memory.cpp,line 593
typedef struct {
long dimSizes[2];
double Numeric[1];
} TD8;
typedef TD8 **TD8Hdl;
TD8Hdl *spec_map;
DSSetHandleSize(*spec_map, sizeof(int32)*2 + 100*10*sizeof(double) );
Greg could you please explain what is wrong with this because i am
still getting an exception error.
You are only giving a small snippet of code, but it looks like you have
a variable, spec_map with an uninitialized value. When calling
DSSetHandleSize, you are dereferencing this variable and you are
probably crashing right there, before you even make the function call.
And if you get lucky and the value is able to be dereferenced, the DSSet
function will be asked to resize a nonexistant handle and will hopefully
return an error that the argument is invalid.
To allocate a handle, you use DSNewHandle which is used as *spec_map=
DSNewHandle(size);
Normally you would be given a param where the handle is already
allocated and just needs to be resized. In that case, use the
SetHandleSize.
Greg McKaskle
Re: signal conditioning
If you are intent on using thermocouples, then I would highly recomend signal conditioning, as at room temperatures, the millivolt output of almost all thermocouples is very low (depends on the type of thermocuple). Thermocouple-specific signal conditioning will also provide for the required signal characterization (thermocouples are not linear devices). The other problem you mention, calibration, is also critical with thermocouples especially if you are operating in the room temperature and lower ranges. You have to have a method of compensating for the reference junction temperature (assuming that it remains constant, which in an outdoor environment, is questionable). Having said all of the above, I would highly recomend that you elect to use RTD's to measure your temperatures. The first gain is that you can calibrate them with a fixed value resistor substitution. There is no reference junction ambiguity/possible-variable to deal with. You will require signal conditioning with and RTD, but the cost is similar to that for a thermocouple, and you circumvent all of the problems of thermocouples. The second big advantage with RTD's is that you can wire to them with ordinary copper wire. With thermocouples, you must use specific thermocouple wire (read expensive) from the thermocouple terminals to the point at which you measure your reference junction. If there is some distance to your thermocouple, the cost of wire can outstrip the cost of the thermocouple itself! Which ever path you decide to take, NI has good signal conditioners listed on their site/in their catalog. Hope this is of some helpt to you. Dave
Re: How I pass a cluster with array of various data type (double,
I have to pass from a VI to a Microsoft Visual C++ DLL, a cluster with some arrays of various data type. The problem is with Double array, that during Visual C debug is incorrect:the dimension is correct passed, but not array data. In the DLL I have inserted the C code genereted by LabVIEW. I tried to pass a cluster of only one array of double, and the results is the same. Then, I tried to pass a cluster with scalar number and the result is correct in only one case. If the double data is the first in the cluster, the result is correct; if the first is another data type, such as integer or boolean, the double data is incorrect during the debug of the DLL. It is hard tell for sure, but you might have alignment problems. The key symptom is that you can pass a cluster of big and small fine, but small big doesn't pass correctly. You might also test this by seeing what the size of your struct is. For Boolean and Double, sizeof() should return nine bytes no matter what order the array is in. If you are getting different sizes, you have two options. You can either order them such that the sizes work, or you can build the EXE or a wrapper DLL so that the alignment matches LV's native alignment. Greg McKaskle
hide front panel when opened
I have a VI running as a back ground task (VI_A) to the main VI (VI_B). VI_B starts VI_A and the idea is that VI_A will be minimised on startup. There is a button on VI_B to restore the window and a button on VI_A to hide the window and return to VI_B. This is all working OK, I open VI_A front panel when called, VI_B minimises VI_A straight away etc, I am using the WINUTIL.LLB functions to perform this. The problem I have is VI_A front panel is visible upon start up for a couple of seconds (there is no real delay in my execution to minimise). I have tried setting VI_A to be at teh back within VI_A but still it appears at the front for a couple of seconds. Does anyone have any suggestions as to why this is occuring. Cheers, Wayne
convert hex string to ascii charactors
How can I simply convert a string 010A to the ascii charactors reprsented by 0x01h, 0x0Ah?? my string could be of any length.
Re: 1000 Responses
conbG/bratulations
How can I view an llb file, or vi file without LabView?
I dont have Labview program. I want to open .llb and .vi files, but I cant with microsoft word, notepad etc. Thanks
Re: how to do a loop for controls
Its great.you have reduced many things.But why all the values are not getting plotted in a single run as the previous one vi that i have sent.In this it is plotting one by one for every run.
Stereo Microphone Sound Cards
LabVIEW has a set of SI-Config/Read/etc VI's that take data from the computer's microphone input. A configuration option is Mono-versus-Stereo. Does anybody have a list (or even one example) of Stereo sound input cards that work with these LabVIEW SI VIs? (Including information such as: Microphone or Line level) Thanks, [EMAIL PROTECTED]
How does Pulse Params Vi determine pulse width
I need to know how the PulseParams vi calculate pulse width, rise/fall time? Is it based on the standard 10/90 method or something else? How does it determine what is a valid pulse? What is the Delay parameter and how do you use it?
