Hello,

I want to add checkLatestVersion functionality to my program. My program will connect foo.com/bar.file and get the latestVersion and compares with currentVersion. If latestVersion is greater then currentVersion that it will give a message (there is a new version, download it) and then quit.

Here is my code:
Qt Code: 
  1. void VersionChecker::checkVersion()
  2. {
  3. 	versionHttp = new QHttp();
  4. 	connect(versionHttp,SIGNAL(requestFinished(int,bool)),this,SLOT(versionHttpData(int,bool)));
  5. 	versionHttp>setHost("www.foo.com", 80);
  6. 	versionHttpRequestId = versionHttp->get("/bar/latest.txt");
  7. }
  8.  
  9. void VersionChecker::versionHttpData(int id, bool error)
  10. {
  11. 	if (id != versionHttpRequestId)
  12. 	{
  13. 		return;
  14. 	}
  15. 	if(error)
  16. 	{
  17. 		latestVersionString = "2.0.0.0";
  18. 		return;
  19. 	}
  20. 	latestVersionString = versionHttp->readAll();
  21. }
  22.  
  23. QString VersionChecker::getLatestVersion()
  24. {
  25. 	return latestVersionString;
  26. }
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and how i use it:

Qt Code: 
  1. QApplication a(argc, argv);
  2.  
  3. 	VersionChecker *versionControl = new VersionChecker();
  4. 	versionControl->checkVersion();
  5. 	QString latestVersion = versionControl->getLatestVersion();
  6.  
  7. 	if(latestVersion != _PROGRAM_VERSION)
  8. 	{
  9. 		NewVersionAvailableDialog *newVersionDialog = new NewVersionAvailableDialog();
  10. 		newVersionDialog->setModal(true);
  11. 		newVersionDialog->setAttribute( Qt::WA_DeleteOnClose );
  12. 		newVersionDialog->show();
  13. 		return a.exec();
  14. 	}
  15.  
  16.  
  17. 	MainForm w;
  18. 	w.show();
  19. 	a.connect(&a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()));
  20. 	return a.exec();
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The problem is, the program runs, QHttp connects and gets the latest version but, while these are being MainWindow is shown. I dont want it to be shown. Firstly latestVersion control must be finished. If current version is the latest version, then MainWindow must shown, otherwise i want the program to quit.

How can I do that? Where's the problem?