On 2/19/07, SaiKamesh Rathinasabapathy <[EMAIL PROTECTED]> wrote:
> Sorry I forgot to attach my sample program in the first mail. here I have
> attached that.
> Hi Daniel,
> Thank you very much once again.Even though you don't know what my
> problem is, you are trying to help me. Thank you very much. Here I have
> attached a sample code which explains what I am trying to do and what the
> problem I am facing. I have given comments to explain my problem. please
> have a look at this program and try to help me!.
>
>
>
> On 2/19/07, SaiKamesh Rathinasabapathy <[EMAIL PROTECTED]> wrote:
> >
> >
> >
> >
> > On 2/18/07, Daniel Elstner < [EMAIL PROTECTED]> wrote:
> > > Am Samstag, den 17.02.2007, 19:19 +0530 schrieb SaiKamesh
> > > Rathinasabapathy:
> > >
> > > > I have already written a program in c++, which reads the data from the
> > > > serial port.
> > > > So I have no problem in reading the data from the barcode reader which
> > > > is connected to the serial port.
> > >
> > > Okay, then I don't know what your problem is. The thing is, the answer
> > > to your question very much depends on the context. Without any context,
> > > it's nearly impossible to help you. The answer might boil down to "hide
> > > it" or "delete it", but I reckon you'd have figured that out by yourself
> > > if it really was that trivial.
> > >
> > > So, why don't you send us a sample program that roughly shows what
> > > you're actually trying to do? And please CC to the list, too.
> > >
> > > > My problem is, when I run my application a window should be opened,
> > > > that has a label on it "Scan the barcode using scanner". then I have
> > > > to read the barcode, after reading the barcode the window should
> > > > automatically be closed, then a new window should be opened.
> > > > I don't know how to close the first window automatically, after
> > > > reading the barcode. plz help me to so this.
> > >
> > > > If possible send me sample program.
> > >
> > > I already said that I don't have such a sample program.
> > >
> > > --Daniel
> > >
> > >
> > >
> > Hi Daniel,
> > Thank you very much once again.Even though you don't know what my
> problem is, you are trying to help me. Thank you very much. Here I have
> attached a sample code which explains what I am trying to do and what the
> problem I am facing. I have given comments to explain my problem. please
> have a look at this program and try to help me!.
> >
>
>
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>
>
Well, the most obvious thing that jumps out is that on line 275 you're
creating a Glib main loop. This loop blocks until either a call to
Gtk::Main::quit() or the obj.wind Gtk::Window is hidden (and probably
other ways I don't know about).
This is the call thats starting things off:
Gtk::Main::run(obj.wind);// displaying the first window
Does rs_getch() ever even get called? I'm just looking at how this is
written and my initial guess is probably not. But then again, I could
be completely wrong because this is a bit hard to parse.
You should probably rework a bit of the architecture here.
First off, I've never made more than a single call to Gtk::Main::run()
in a program. I'm not sure if anyone else has done this, but I'm
guessing most people on the list will agree that its probably not a
good idea in this case.
If I were writing this, I would start with this basic structure:
Create a main window class. This is the first window show.
When the main window is instantiated, create a Glib::IOSource for your
serial port communication. (This gets rid of all your signaling code.)
http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/classGlib_1_1IOSource.html
Once, you read enough from the serial port you can call a function
that performs your mysql lookup.
In this same function you can use a dialog to display the message
about being logged in.
Something like the following:
MainWindowClass:
Constructor()
open serial port with options (like you already have)
create IOSource
connect callback to IOSource ( on_data_ready() )
on_data_ready():
read data from serial port until a block would occur.
(you can check by testing errno == EAGAIN )
store data read in buffer.
if( all data has been read ):
perform_mysql_look()
if( lookup is successful ):
notify_user( success )
else
notify_user( failure )
The trickiest part of all this should be in your on_data_read()
method. Specificaly the
if( all data has been read ):
check. I usually pick ease of coding over efficiency and read all
data a byte at a time. Granted I'm not reading huge amounts of data so
this is generally ok. You only seem to be reading a max of 600 bytes
so this would probably be fine for you as well.
Anyway, that should be enough to get you going for a bit.
HTH,
Paul Davis
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