TControlBar Function Calling issue

ROOT
1

Hello ,

I am trying to develop a standalone application using the TGeom library to display the geometry of a detector to illustrate the hits and tracking of the particles traveling through it. The geometry and tracking isn’t proving to be too difficult but I was trying to make a TControlBar that would control the program and allow for the selection of different entries in the TTree I am reading data from.

When I attempt to call a function from a button I get the following code returned in the terminal:

Error: Function box() is not defined in current scope (tmpfile):1:
*** Interpreter error recovered ***

I have attempted numerous methods to define the function box() which is just a test program for now. I have tried to find previous suggestions I have found online but so far have been unable to correct it. My code is attached below. One interesting thing I noticed is that to exit the control bar I had to use the command “.q”. To me this means the program is dependent on ROOT CINT and isn’t looking for the compiled function but I have no idea how to fix it, but this is just my current thought about it.

int main(int argc, char **argv){
TApplication * theApp = new TApplication(“RichEvent”, 0, 0);
TControlBar *bar = new TControlBar(“vertical”, “Pienu Visualization GUI”,200,10);
bar->AddButton(“Box Geom”,“box()”,“This will make a random Geometry”);
bar->AddButton(“exit”,".q",“This will close the program”);
bar->SetButtonWidth(400);
bar->Show();
theApp->Run();
return 0;
}

Thanks for you help,

Cameron

2

Replace the line:

bar->AddButton("exit",".q","This will close the program"); by

bar->AddButton("exit","gROOT->ProcessLine(\".q\")");
Rene

3

Cameron did you ever solved this and how, I’m having the exact same issue.

4

Just to clarify, the issue is with the box() function that is not recognized, not the quit call.

5

You have to generate a dictionary for the box() function. Take a look at this example: box.tar.gz (810 Bytes)

6

Thanks for the reply. This worked.

I would appreciate (but will understand if you can’t) the procedure to make the box method setupBox below available to the bar:

modified box.h:

#include "Riostream.h"

class box {
public:
	box() = default;

	void setupBox() {
		std::cout << "from global run_me() : Hello!\n";

	}
};
7

In LinkDef.h, replace:
#pragma link C++ function box;
by:
#pragma link C++ class box+;

And in box.cxx (showing only the relevant part):

   box *mybox = new box();
   TApplication *theApp = new TApplication("RichEvent", 0, 0);
   TControlBar *bar = new TControlBar("vertical", "Pienu Visualization GUI",200,10);
   bar->AddButton("Box Geom", Form("((box *)0x%ld)->setupBox()", mybox), "This will make a random Geometry");

Cheers, Bertrand.

1 Like
8

Ah thanks so much Bertrand.

I did have to remove 0x:

bar->AddButton(“Box Geom”, Form("((box *)%ld)->setupBox()", mybox), “This will make a random Geometry”);

After that your solution worked. Thanks so much!

Amicalement,
Mauri

1 Like