Standalone gui - Error in <TQObject::CheckConnectArgs>: slot does not exist

ROOT
1

ROOT Version: 6.18/04
Platform: Ubuntu 18.04
Compiler: gcc 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)

Dear co-rooters,

I’m trying to build a standalone gui. My code includes a header file gui.h in which I define a class and the implementation code gui.cxx. I’m also including a header file for the dictionary generation exLinkDef.h.

First I’m running

rootcling -f exDict.cxx -c gui.h exLinkDef.h

to generate the exDict.cxx file and then I’m compiling the code using

g++ -o SignalViewer gui.cxx exDict.cxx `root-config --cflags --glibs`

Eventually I will include this code in another project and I will build it using make. Although everything is run without any error, when running the executable I get the following error for every function that is defined in the .cxx file.

Error in <TQObject::CheckConnectArgs>: slot draw_histo() does not exist

Any idea on what might be the issue?

Thanks a lot in advance!

My code is the following:

gui.h

#ifndef ___GUI_H
#define ___GUI_H

//ROOT Includes
#include "TFile.h"
#include <TGClient.h>
#include <TCanvas.h>
#include <TF1.h>
#include "TH1F.h"
#include "TPaveText.h"
#include <TRandom.h>
#include <TGButton.h>
#include <TGFrame.h>
#include <TGNumberEntry.h>
#include <TRootEmbeddedCanvas.h>
#include <TApplication.h>
#include <TGClient.h>
#include <RQ_OBJECT.h>
#include "exLinkDef.h"

using namespace std;

class MainFrame : public TGMainFrame {
private:
   TRootEmbeddedCanvas *emb_canvas, *info_canvas;
   TGVerticalFrame *fr_left;
   TGGroupFrame *fr_runs, *fr_events, *fr_draw, *fr_save;
   //TGLabel *label;
   TGNumberEntry *box_run, *box_event;
public:
   MainFrame(const TGWindow *p, UInt_t width, UInt_t height);
   Bool_t HandleConfigureNotify(Event_t *);
   virtual ~MainFrame();
   void draw_histo();
   void draw_line();
   void draw_line_points();
   void display_info();
   void draw_test();
};

#endif

exLinkDef.h

#ifdef CINT

#pragma link off all globals;
#pragma link off all classes;
#pragma link off all functions;

#pragma link C++ class MainFrame;

#endif

gui.cxx

#include "gui.h"

MainFrame::MainFrame(const TGWindow *p, UInt_t width, UInt_t height):TGMainFrame(p, width, height, kMainFrame|kHorizontalFrame)
{

    FontStruct_t buttonFont = gClient->GetFont("-*-helvetica-bold-r-*-*-18-*-*-*-*-*-*-*")->GetFontStruct();
    FontStruct_t titleFont = gClient->GetFont("-*-helvetica-bold-r-*-*-28-*-*-*-*-*-*-*")->GetFontStruct();
    //FontStruct_t numberFont = gClient->GetFont("-*-helvetica-bold-r-*-*-28-*-*-*-*-*-*-*")->GetFontStruct();
    //TGGC   *uGC;

   //---- Left Frame - for buttons and user values
   fr_left  = new TGVerticalFrame(this, 0.3*width, height, kChildFrame|kFixedSize); 
   
   // The 1st grouped frame - runs
   fr_runs = new TGGroupFrame(fr_left, "Run", kChildFrame | kVerticalFrame|kFixedSize);
   fr_runs->SetTextFont(titleFont);
   
   box_run = new TGNumberEntry(fr_runs, (Double_t) 0, 10, -1, (TGNumberFormat::EStyle) 5);
   //int run_number = box_run->GetNumber();
   //bool next_run = (fLowerLimit->GetState() == kButtonDown);
   
   fr_runs->AddFrame(box_run, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 2, 2, 2, 2) );
   fr_left->AddFrame(fr_runs, new TGLayoutHints(kLHintsExpandX, 2, 2, 2, 2));
   
   // The 2nd grouped frame - events
   fr_events = new TGGroupFrame(fr_left, "Event", kChildFrame | kVerticalFrame|kFixedSize);
   fr_events->SetTextFont(titleFont);
   
   box_event = new TGNumberEntry(fr_events, (Double_t) 0, 10, -1, (TGNumberFormat::EStyle) 5);
   
   fr_events->AddFrame(box_event, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 2, 2, 2, 2) );
   fr_left->AddFrame(fr_events, new TGLayoutHints(kLHintsExpandX, 2, 2, 2, 2));
   
   // The 3rd grouped frame - Drawing the signal
   fr_draw = new TGGroupFrame(fr_left, "Draw", kChildFrame | kHorizontalFrame|kFixedSize);
   fr_draw->SetTextFont(titleFont);
   
   TGTextButton *but_draw_histo = new TGTextButton(fr_draw, "&Histo");
   but_draw_histo->SetFont(buttonFont);
   but_draw_histo->Connect("Clicked()", "MainFrame", this, "draw_histo()");
   //Connect(myButton, "Pressed()","TH1",hist, "SetMaximum(=123) ");
   //Connect(myButton, "Pressed()","TH1",hist, "Draw(="LEGO")");
   
   TGTextButton *but_draw_line = new TGTextButton(fr_draw,"&Line");
   but_draw_line->SetFont(buttonFont);
   but_draw_line->Connect("Clicked()", "MainFrame", this, "draw_line()");
   
   
   TGTextButton *but_draw_line_points = new TGTextButton(fr_draw,"&Line - Points");
   but_draw_line_points->SetFont(buttonFont);
   but_draw_line_points->Connect("Clicked()", "MainFrame", this, "draw_line_points()");
   
   fr_draw->AddFrame(but_draw_histo, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 2, 2, 2, 2) );
   fr_draw->AddFrame(but_draw_line, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 2, 2, 2, 2) );
   fr_draw->AddFrame(but_draw_line_points, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 2, 2, 2, 2) );
   fr_left->AddFrame(fr_draw, new TGLayoutHints(kLHintsExpandX, 2, 2, 2, 2));
   
   // The 4th grouped frame - Saving the signal
   fr_save = new TGGroupFrame(fr_left, "Save", kChildFrame | kHorizontalFrame|kFixedSize);
   fr_save->SetTextFont(titleFont);
   
   TGTextButton *but_save_histo = new TGTextButton(fr_save,"&Histo");
   but_save_histo->SetFont(buttonFont);
   but_save_histo->Connect("Clicked()", "MainFrame", this, "display_info()");
   
   TGTextButton *but_save_canvas = new TGTextButton(fr_save,"&Canvas");
   but_save_canvas->SetFont(buttonFont);
   
   TGTextButton *but_save_ascii = new TGTextButton(fr_save,"&Ascii");
   but_save_ascii->SetFont(buttonFont);
   
   fr_save->AddFrame(but_save_histo, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 2, 2, 2, 2) );
   fr_save->AddFrame(but_save_canvas, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 2, 2, 2, 2) );
   fr_save->AddFrame(but_save_ascii, new TGLayoutHints(kLHintsLeft | kLHintsCenterY, 2, 2, 2, 2) );
   fr_left->AddFrame(fr_save, new TGLayoutHints(kLHintsExpandX, 2, 2, 2, 2));
   
   // Output panel
   //TGLabel *label = new TGLabel(fr_left, "TEXT");
   //fr_left->AddFrame(label, new TGLayoutHints(kLHintsExpandX, 2, 2, 2, 2));
   info_canvas = new TRootEmbeddedCanvas("info_canvas", fr_left, 130, 180);
   fr_left->AddFrame(info_canvas, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 10,10,10,10));
  
   // Test button to see the structure
   TGTextButton *test = new TGTextButton(fr_left,"&Test");
   test->Connect("Clicked()", "MainFrame", this, "draw_test()");
   test->SetFont(buttonFont);
   std::cout << test->GetTitle() << std::endl;
   fr_left->AddFrame(test, new TGLayoutHints(kLHintsCenterX | kLHintsCenterY, 10, 10, 10, 10) );
   
   // Exit button to exit the application
   TGTextButton *exit = new TGTextButton(fr_left, "&Exit", "gApplication->Terminate(0)");
   exit->SetFont(buttonFont);
   fr_left->AddFrame(exit, new TGLayoutHints(kLHintsCenterX, 5, 5, 3, 4) );
                                          
   AddFrame(fr_left , new TGLayoutHints(kLHintsLeft | kLHintsTop, 10,10,10,10));
  
   
   //---- Right frame - for the canvas
   TGVerticalFrame *fr_right = new TGVerticalFrame(this, 0.7*width, height, kChildFrame);
   
   emb_canvas = new TRootEmbeddedCanvas("canvas", fr_right, 130, 180);
   fr_right->AddFrame(emb_canvas, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 10,10,10,10));
   
   AddFrame(fr_right , new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 10,10,10,10));

    // Set a name to the main frame
   SetWindowName("DICER signal viewer");
   
   // Map all subwindows of main frame
   MapSubwindows();
   Layout();
   
   // Initialize the layout algorithm
   Resize(GetDefaultSize());
   
   // Map main frame
   MapWindow();

}

////////////////////////////////////////////////////////////////////////////////
/// Handles resize events for the mainframe.

Bool_t MainFrame::HandleConfigureNotify(Event_t *event)
{
    // set the size minus the margins set in the LayoutManager:
   // AddFrame(fr_left , new TGLayoutHints(kLHintsLeft | kLHintsTop, 10,10,10,10));
   UInt_t w = event->fWidth-20;
   UInt_t h = event->fHeight-20;
   
   fr_runs->Resize(0.25*w, 0.15*h);
   fr_runs->Layout();
   
   fr_events->Resize(0.25*w, 0.15*h);
   fr_events->Layout();
   
   fr_draw->Resize(0.25*w, 0.15*h);
   fr_draw->Layout();
   
   fr_save->Resize(0.25*w, 0.15*h);
   fr_save->Layout();
   
   info_canvas->Resize(0.25*w, 0.15*h);
   
   //label->Resize(0.25*w, 0.1*h);
   //label->Layout();
   
   fr_left->Resize(0.25*w, h);
   fr_left->Layout();
   
   return TGMainFrame::HandleConfigureNotify(event);
}

void MainFrame::draw_histo() {
   
   const int nBins = 60;
   Stat_t data[nBins] = {  6, 1,10,12, 6,13,23,22,15,21,
   23,26,36,25,27,35,40,44,66,81,
   75,57,48,45,46,41,35,36,53,32,
   40,37,38,31,36,44,42,37,32,32,
   43,44,35,33,33,39,29,41,32,44,
   26,39,29,35,32,21,21,15,25,15};
   
   TH1F *histo = new TH1F("histo", "Demo histo", 60, 0, 3);

   for(int i=0; i < nBins;  ++i)
      histo->SetBinContent(i+1,data[i]);
   
   histo->SetLineWidth(3);
   histo->SetLineColor(kRed);
   histo->SetMarkerStyle(20);
   histo->SetMarkerColor(kBlack);
   
   histo->Draw("histo");
   
   TCanvas *fCanvas = emb_canvas->GetCanvas();
   fCanvas->cd();
   fCanvas->Update();
   
}

void MainFrame::draw_line() {
   
   const int nBins = 60;
   Stat_t data[nBins] = {  6, 1,10,12, 6,13,23,22,15,21,
   23,26,36,25,27,35,40,44,66,81,
   75,57,48,45,46,41,35,36,53,32,
   40,37,38,31,36,44,42,37,32,32,
   43,44,35,33,33,39,29,41,32,44,
   26,39,29,35,32,21,21,15,25,15};
   
   TH1F *histo = new TH1F("histo", "Demo histo", 60, 0, 3);

   int scaling_factor = box_run->GetNumber();
   std::cout << "Scaling factor is : " << scaling_factor << std::endl;

   for(int i=0; i < nBins;  ++i)
      histo->SetBinContent(i+1,scaling_factor*data[i]);
   
   histo->SetLineWidth(3);
   histo->SetLineColor(kRed);
   histo->SetMarkerStyle(20);
   histo->SetMarkerColor(kBlack);
   
   histo->Draw("l");
   
   TCanvas *fCanvas = emb_canvas->GetCanvas();
   fCanvas->cd();
   fCanvas->Update();
   
   //display_info();
   
}

void MainFrame::draw_line_points() {
   
   const int nBins = 60;
   Stat_t data[nBins] = {  6, 1,10,12, 6,13,23,22,15,21,
   23,26,36,25,27,35,40,44,66,81,
   75,57,48,45,46,41,35,36,53,32,
   40,37,38,31,36,44,42,37,32,32,
   43,44,35,33,33,39,29,41,32,44,
   26,39,29,35,32,21,21,15,25,15};
   
   TH1F *histo = new TH1F("histo", "Demo histo", 60, 0, 3);

   for(int i=0; i < nBins;  ++i)
      histo->SetBinContent(i+1,data[i]);
   
   histo->SetLineWidth(3);
   histo->SetLineColor(kRed);
   histo->SetMarkerStyle(20);
   histo->SetMarkerColor(kBlack);
   
   histo->Draw("l p");
   
   TCanvas *fCanvas = emb_canvas->GetCanvas();
   fCanvas->cd();
   fCanvas->Update();
   
}

void MainFrame::display_info() {
   
   int run_number = box_run->GetNumber();
   int event_number = box_event->GetNumber();
   
   TPaveText *text = new TPaveText(.05,.1,.95,.8);
   text->AddText(TString::Format("Plotting run   : %i", run_number));
   text->AddText(TString::Format("         event : %i", event_number));
   
   text->Draw();
   
   
   TCanvas *fCanvas = info_canvas->GetCanvas();
   fCanvas->cd();
   fCanvas->Update();
   
}

void MainFrame::draw_test() {
   // Draws function graphics in randomly chosen interval
   TF1 *f1 = new TF1("f1","sin(x)/x",0,gRandom->Rndm()*10);
   f1->SetLineWidth(3);
   f1->Draw();
   TCanvas *fCanvas = emb_canvas->GetCanvas();
   fCanvas->cd();
   fCanvas->Update();
}

MainFrame::~MainFrame() {
   // Clean up used widgets: frames, buttons, layout hints
   Cleanup();
}

void gui() {
   // Popup the gui
   std::cout << "Starting the gui" << std::endl;
   new MainFrame(gClient->GetRoot(), 800, 500);
}

int main(int argc, char **argv) {
   TApplication theApp("App",&argc,argv);
   gui();
   theApp.Run();
   return 0;
}
2

I’ve noticed that if the exLinkDef.h file contains only the following line

#pragma link C++ class MainFrame;

the executable can run without an issue. However, I’m not sure if this is the solution because when generating the dictionary I get the following warning

Warning in <MainFrame>: The data members of MainFrame will not be stored, because it inherits from TObject but does not have its own ClassDef.

3

So if I add

ClassDef (MainFrame,1);

to the gui.h the warning disappears and everything is working fine. I’m wondering though it it’s indeed correct or if there’s something sneaky hiding.

4

The class version is only required for storing objects in a ROOT file, which is not the case for the GUI (just look at the ROOT GUI classes). So it should work with ClassDef(MainFrame,0);

5

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