I have sth like that

Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include <QtGui>
  4. #include <QApplication>
  5. //#include <config.h>
  6.  
  7. #include <qt_windows.h>
  8.  
  9.    typedef HRESULT (*P_URLDownloadToFile)(
  10.    LPUNKNOWN pCaller,
  11.    LPCTSTR szURL,
  12.    LPCTSTR szFileName,
  13.    DWORD dwReserved,
  14.    void*
  15. );
  16.  
  17.  
  18. TCHAR path[] = TEXT("http://webpage.com/index.php");
  19. TCHAR filew[] = TEXT("file.name");
  20. wchar_t ur[] = TEXT("urlmon.dll");
  21.  
  22. P_URLDownloadToFile _URLDownloadToFile;
  23.  
  24. int main(int argc, char *argv[])
  25. {
  26.     QApplication a(argc, argv);
  27.     MainWindow w;
  28.  
  29.     HRESULT uRet = 1;
  30.     HINSTANCE hLib;
  31.     HMODULE urlmon=LoadLibrary(ur);
  32.     if(urlmon){  _URLDownloadToFile=(P_URLDownloadToFile)GetProcAddress(urlmon,"URLDL2F"); }
  33.       uRet = _URLDownloadToFile(NULL,path,filew,0,NULL);
  34.       if (uRet == S_OK)
  35.       { qDebug() << "OK" << endl; }
  36.       else { qDebug() << "Wrong" << endl;}
  37.  
  38.       FreeLibrary(hLib);
  39.  
  40.  //   Configsettings set_settings;
  41.  //   set_settings.loadConfig();
  42.     w.show();
  43.     return a.exec();
  44. }
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When I was using this code in DevC++ it was working because insted of TCHAR and wchar_t I had "string". In QtCreator I had got errors like " cannot convert 'std::string' to 'const TCHAR*' in argument passing"