hi all
this is Full Source of My Program
Qt Code: 
  1. #include "mainwindow.h"
  2. #include <QApplication>
  3. #include <QSystemTrayIcon>
  4. #include <QMenu>
  5. #include <QAction>
  6. #include <QFileDialog>
  7. #include <QMessageBox>
  8. #include <thread>
  9. #include <fstream>
  10. #include <QTextStream>
  11. #include <time.h>
  12. #include <windows.h>
  13. using namespace std;
  14.  
  15.  
  16.  
  17.     const tm* timeinfos;
  18. void tray();
  19. void refresh();
  20. void starts();
  21. void wait();
  22. ofstream dif("d:\\dif.txt");
  23. const char* const path = "d:\\dif.txt" ;
  24. void starts();
  25. int hour=0,minu=0;
  26. ofstream times("d:\\time.txt");
  27. struct tm * timeinfo;
  28.  time_t rawtime = time(0) ;
  29.  int sec,secd;
  30.     MainWindow w;
  31.  
  32.  
  33.  
  34. int main(int argc, char *argv[])
  35. {
  36.     QApplication a(argc, argv);
  37.     w.hide();
  38.     std::thread first(tray);
  39.     std::thread second(starts);
  40.     std::thread third(refresh);
  41.     starts();
  42.             first.join();
  43.             third.join();
  44.  
  45.     return a.exec();
  46. }
  47.  
  48.  
  49. void tray(){
  51.        QMenu *menu=new QMenu("TimeUsage");
  52.        menu->addAction("Open");
  53.        menu->addAction("Exit");
  54.        trayIcon->setContextMenu(menu);
  55.        trayIcon->setIcon(QIcon("e:\\icon.png"));
  56.        trayIcon->show();
  57.        trayIcon->showMessage("TimeUsage","TimeUsage Is Here!");
  58.  
  59.        QObject::connect(menu,&QMenu::triggered,[&w](QAction* act){
  60.  
  61.            const auto& text = act->text();
  62.            if(text=="Exit"){
  63.                QApplication::exit();
  64.            }
  65.            else if(text=="Open"){
  66.                w.show();
  67.            }
  68.  
  69.  
  70.        });
  71. }
  72.  
  73.  
  74. void refresh(){
  75.     for(;;){
  76.         wait();
  77.     time_t now = time(0) ;
  78.         ifstream dif(path);
  79.         time_t earlier = 0  ;
  80.         dif >> earlier ;
  81.  
  82.         double secs = difftime( now, earlier );
  83.         minu=secs/60;
  84.         while(minu>60){
  85.             minu-=60;
  86.             hour++;
  87.         }
  88.         QFile times("d:\\time.txt");
  89.         times.open(QIODevice::Append);
  90.         QTextStream stream(&times);
  91.         stream<<asctime(timeinfos)<<endl<<hour<<"/"<<minu<<endl;
  92.     }
  93. }
  94.  
  95.  
  96. void starts(){
  97.     timeinfos = localtime ( &rawtime );
  98.  
  99.     ofstream dif(path);
  100.     dif << rawtime << '\n' ;
  101.     dif.close();
  102.     refresh();
  103. }
  104.  
  105.  
  106. void wait(){
  107.     int i;
  108.     for (i=0; i<=10; ++i) {
  109.           this_thread::sleep_for (chrono::seconds(1));
  110. }
  111. }
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the Program Has No Problem With Compiling But will Not Run And I Get the Following Error:
Untitled.png
Any Help Will Be Great