I have a macro which has the task of reading in several files of a TNT2 card and make with these data a new histogram.
I know want to transfer this macro to a executable file.
That worked quite well since I got that I have to include TROOT and TApplication somewhere. But at the moment this is only working as long as I give only one filename as a argument.
I don’t know how to hand over more since the call of TApplication deletes the number of arguments:
int main(int argc, char** argv)
TApplication theApp("App", &argc, argv);
After this call argc is set back to 1 and something happens to argv as well, but I don not exactly know what.
I need the information of argc and argv to implement a for loop which runs my algorithms as long as there are arguments/files but do I really have to make copies of the mentioned vectors?
Another problem with converting the script to a executable is that the canvas which is drawn as a final result just flashes on the monitor and then vanishes immediatly since the application closes immediatly:
TGraph *tofhisto = new TGraph(channels,channel_x,channel_y);
I added a theApp.Run(); to be able to access the canvas (resize, etc.), but than when I close the canvas I get the error message
and I have to use ctrl+c to finally close the app - how can I avoid that?
I hope that I described my problems detailed enough; if you need more information please ask, if you think I missed an important part of the manual somewhere please also point it out, and I will try to solve bymyself first.
if you don’t want your users to be able to use the default ROOT arguments you can do
int main(int argc, char** argv)
int argcROOT = 1;
char* argvROOT = argv;
TApplication theApp("App", &argcROOT, &argvROOT); (TApplication just needs the app’s name). Use TPad::WaitPrimitive to leave the canvas hanging around until the user clicks somewhere.
thanks for the answer, I’m now able to process as many files as I want to
But I did not got the part about WaitPrimitive: I understood the examples on the calls description page of TPad that it should be enough to call it like
But that didn’t work, it didn’t change the behaviour of the application window at all - to eb more clear:
If I press ctrl+c in the command line or close the window by the file menu it closes as it is exected, without any error, but when I press the X button of the window than there is the invalid pointer error.
The windowmanager I’m using is KWM (KDE) on a Mandriva 10.1 system with KDE 3.2.3
You do not need to call gPad->WaitPrimitive if you run a TApplication.
See examples of main program in $ROOTSYS/test programs like hworld, hworld2, etc.
Hm, do I get this right that there is no possibility of closing the application through the X of the window manager?
quit->SetLabel("Select File/Quit again to exit app");
But at least this version does not produce the mentioned error; but I still have to press ctrl+c to get back to the command line.
Btw., I work remote (ssh -X) on the machine which has root installed, but that shouldn’t make any difference…
Again, you do not send enough information to solve your problem.
Note that in general IT IS A VERY BAD IDEA to implement your main program, if you do not understand how the Application event loop works.
Simply write a script that you execute from the ROOT prompt via
root > .x myscript.C
root > .x myscript.C+ (use the native compiler via ACLIC)
Thanks for the fast answer already at the same night very much, Rene!
About the missing information: if I would exactly know what is missing I wouldn’t need any help. And I know that there is the command line and the scripts, but you have to start somewhen when you want to explore new fileds (applications in this case)
Looks like I was to early. I will get back then to the manuals to try it by myself. If I find any solution I will post it here (in case others stumble over this thread).
I have the same problem. After runnin the Run() command I have to press ctrl-C to return to the command line…and nobody seems to know the answer!!
I have to compile my code. Running it from the root console is slower…
Hi,[quote=“moriei”]I have to compile my code. Running it from the root console is slower…[/quote]You do know you can use ROOT’s built-in build system to compile your code, don’t you? It’s called ACLiC, and it plays a major role in the Users Guide. You can simply run “.x mycode.cxx+”, and ROOT will compile, link, and load your code, and then call mycode(). On all platforms.