Re: [Flightgear-devel] Help needed fo write an FG string property
HI Curtis thanks for the response,
Well I tore my hair out for a couple of days. But I could never make any
sense of the string stored in the structure, nor could I find a string
terminator in it. I dont know exactly why as i am not very experieced in c
strings.
I ended up putting the property to a local string, then writing it into a
normal char array in the structure adding a teminator after the last
printable.
Certianly not elegant but works for now to load the stucture. A programer
would write it differently to me!
tempnode = node-getChild(registration);
pt = net-registration[i];// pointer to array
in struct
pt[0] = '\0'; // put an end
of string for default
if ( tempnode != NULL ) {
temp = tempnode-getStringValue();
n=0;
x=0x31;
while ( (x 0x19) (x0x7f) (n SL_MAX_REGISTRATION)){
x=temp[n];// pointer
to prop string to send
pt[n] = x; // wite to
the struct string
n++;
}
pt[n] = '\0'; //0x0A;
}
From the structure Its written into the other machine with
node-setStringValue(registration, net-registration[i]);
The file is a clone of the native controls io, purpose being to forward the
clouds, AI and multiplayer info to the slave pcs for display.
Now I have the Ai aircraft data across to the slaves, my next question is
where does FG pick up the AI items attached for display by the AIbase? Ie I
need to fool the slaves to display the imported aircraft from the data,
preferably with out diabling the Ai base as It is still used displaying the
multiplayer on the slaves from another protocol and port.
I know i could do it with a cloned Ai update funtion, but maybe i can do it
at a lower level?
BTW ref our mail of last weekend, I have been putting a drawing together of
how I have interconnected the sim aircraft hardware by can bus to FG I
would have mailed it by now if I had not been banging my head on the walls
with this string issue. I will revert with it shortly
Regards Harry
On Fri, Apr 17, 2009 at 2:30 AM, Curtis Olson curtol...@gmail.com wrote:
On Thu, Apr 16, 2009 at 1:07 AM, Harry Campigli wrote:
How fo write an FG string property from an indexed string in a structure?
Possibly someone can help please , I have tried to find an example with no
luck, I am sure i had it working yesterday but now every way i try i end up
with it wrong at compile, a seg fault or a property node with an empty
string. The basic setup works fine with doubles ect, here i only show the
string code.
Its wrong, but this is what i want to do, where : index i is declared as
an int, path is a node, and path[i] is a string indexed in the structure
called buf-node-setStringValue(path,buf-path[i]);
)
1-The stucture called buf with indexed stings in it from the h file
enum {
FG_MAX_AIRCRAFT = 25
};
uint32_t num_aircraft;
string callsign[FG_MAX_AIRCRAFT];
string path[FG_MAX_AIRCRAFT];
2- I write to the stucture with
tempnode = node-getChild(path);
if ( tempnode != NULL ) {
net-path[i] = tempnode-getStringValue();
}
At a glance, this looks like it should work. I believe getStringValue()
returns a const char * type and you should be able to assign this to a
string variable like you show in your example code.
If I was going to dig into this, I might start inserting some printf()'s to
dump out the value of tempnode-getStringValue() to make sure that is sane.
Make sure [i] is a sane index value, etc. Off by one errors are pretty easy
to accidentally introduce. Hehe, I still have trouble with those off by an
order of magnitude errors ... :-)
Without seeing your surrounding code, I think I would be most interested in
first checking the value of i. That should remain between 0 and 24 (i=25
would be an array overrun because you'd be referencing the 26th element of
the array.)
Best regards,
Curt.
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Re: [Flightgear-devel] aircraft modeling question
On Thursday 16 April 2009, Curtis Olson wrote: On Tue, Apr 14, 2009 at 12:26 PM, Torsten Dreyer tors...@t3r.de wrote: My questions is this ... from a modeling perspective, can that 2nd aircraft be animated with absolute lon/lat/elev and roll/pitch/yaw degrees? Or would we need to compute an X, Y, Z offset in meters for the second aircraft? It would be a pain to figure out the orientation transform relative to the original aircraft ... can the secondary aircraft be animated with absolute angles relative to the world coordinate frame? (For animating the 2nd aircraft, I imagine we'd create some set of custom property names, and I'd drive them externally via some network/file protocol ... maybe creating a custom configuration for the generic protocol.) Don't know if I understand you right, but if you want to create arbitrary aircraft with independent position and attitude values, you might want to use the multiplayer protocol. If you fake the mp-server, you might inject any number of aircraft into your scene. I was hoping for a reasonably simple solution without needing new external software development, but the idea of leveraging the multiplayer protocol is interesting. I notice that with our existing multiplayer servers, there is at least a many second delay in positioning the MP aircraft. Is that delay imposed by the server side, or is there something built into the protocol that could cause position updates to be delayed before they are drawn? Back to my other idea. It shouldn't be hard to figure out an XYZ offset of a 2nd piggyback model. But in terms of orientation, are there animation primitives that would allow me to specify absolute euler angles for the 2nd model, or would those angle also have to be computed relative to the primary model orientation (that's doable I suppose, but my brain has begun to hurt just at the suggestion of having to do it.) :-) Thanks, Curt. I can't recall any animation methods that are not relative to the orientation of the aircraft axis. On the other hand though, things like pitch, roll, altitude, lat, lon etc. are absolutes and available in the property tree, so it should be easy enough to derive an equivalent absolute frame of reference. That is, it should be easy enough to use these property tree nodes in your animations while they're atomic values but if it's decided that they should be represented by compound values, and it makes as much sense to use them for lat, lon alt, or pitch, roll yaw, as using them anywhere else, you'd have to write some code to parse them first. LeeE -- Stay on top of everything new and different, both inside and around Java (TM) technology - register by April 22, and save $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco. 300 plus technical and hands-on sessions. Register today. Use priority code J9JMT32. http://p.sf.net/sfu/p ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
[Flightgear-devel] Startup Problem
Hi, Did an upload of the the latest CVS 1.9.1, build went just fine but when starting the following happens... [cas...@rampart FlightGear]$ ./run *** *** *** Warning: changing bad FG_ROOT/--fg-root to '/usr/local/share/FlightGear/data' *** *** *** *** *** Warning: changing bad FG_ROOT/--fg-root to '/usr/local/share/FlightGear/data' *** *** ./run: line 10: 11192 Segmentation fault /usr/local/src/FlightGear-1.9.1/src/Main/fgfs --fg-root=/usr/local/share/FlightGear --geometry=1024x768 --airport=KSFO --prop:bool:/sim/rendering/random-vegetation=false --disable-random-objects --timeofday=noon --disable-clouds3d The database is the 1.9.0 release. While that doesn't appear to be the immediate problem, should that be updated as well -- best way?? via CVS?? Here is the run shell script ,, #!/bin/sh /usr/local/src/FlightGear-1.9.1/src/Main/fgfs \ --fg-root=/usr/local/share/FlightGear \ --geometry=1024x768 \ --airport=KSFO \ --prop:bool:/sim/rendering/random-vegetation=false \ --disable-random-objects \ --timeofday=noon \ --disable-clouds3d Nothing fancy, just something to get things moving. Everything worked when I first built 1.9.0 a few months ago, but this warning msg is something new. Any thoughts on what is wrong? Thanks JW -- Stay on top of everything new and different, both inside and around Java (TM) technology - register by April 22, and save $200 on the JavaOne (SM) conference, June 2-5, 2009, San Francisco. 300 plus technical and hands-on sessions. Register today. Use priority code J9JMT32. http://p.sf.net/sfu/p ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
