Hey guys,

i'm making a program with a gui, due to ram and cpu specifications i need to put this program on a cluster and run it there. I cannot get gui support from the server through vpn. So im trying to make my app work as a gui or as a commandline program.

I can start the program from command line with the command(this is on linux):
"./imex" -> with gui
"./imex -nogui" -> withought gui

the thing im interested in, is the final if{nogui==false} below, why does my gui not show up on my testmachine if i run the ./imex command, if i dont run the nogui check ( the if {nogui==false} it will run fine).

Qt Code: 
  1. #include "mainwindow.h"
  2. #include <QApplication>
  3. #include "imex.h"
  4. #include <SpiceUsr.h>
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.     QApplication a(argc, argv);
  9.  
  10.     qDebug() << "";
  11.  
  12.     //start with gui if not specified
  13.     bool nogui=false;
  14.  
  15.     //check input arguments
  16.     for (int i=1; i<argc; i++)
  17.    {
  18.  
  19.         if( strncmp(argv[i], "-nogui", 9) == 0)
  20.         {
  21.             nogui=true;
  22.             //no gui support
  23.  
  24.             imex guidata;
  25.             qDebug() << "Input kernel location";
  26.             QTextStream s(stdin);
  27.             guidata.filepath_metakernel = s.readLine();
  28.             qDebug() << "Path is: " << guidata.filepath_metakernel;
  29.  
  31.             const char *c_str;
  32.  
  33.             //QString -> C-String
  34.             ba = guidata.filepath_metakernel.toUtf8();
  35.             c_str = ba.data();
  36.  
  37.             furnsh_c(c_str);
  38.  
  39.             qDebug() << "No consol, not implemented";
  40.             qDebug() << "";
  41.         }
  42.     }
  43.     if(nogui == false)
  44.     {
  45.         qDebug() << "running gui";
  46.         //run gui
  47.         MainWindow w;
  48.         w.show();
  49.     }
  50.     return a.exec();
  51. }
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can someone explain what happens with the gui if i put the mainwWindow w; w.show(); in the if-brackets?