Here's a convinience function for determining Windows version:

Qt Code: 
  1. typedef enum {Vista, Windows, XP} WindowsVersion;
  2.  
  3. WindowsVersion getWindowsVersion(){
  4. 	OSVERSIONINFOEX osvi;
  5.    BOOL bOsVersionInfoEx;
  6.    ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
  7.    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
  8.  
  9.    if( !(bOsVersionInfoEx = GetVersionEx ((OSVERSIONINFO *) &osvi)) ){
  10. 	  osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
  11. 	  if (! GetVersionEx ( (OSVERSIONINFO *) &osvi) )
  12. 		 return Windows;//default
  13.    }
  14.  
  15.    switch (osvi.dwPlatformId){
  16.       case VER_PLATFORM_WIN32_NT:
  17.  
  18.          if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1 )
  19.             return XP;
  20.  
  21.          if ( osvi.dwMajorVersion >= 6 )
  22.             return Vista;
  23.    }
  24.    return Windows;
  25. }
  26.  
  27. class CheckBoxStyleNoFocusDraw_XP: public QWindowsXPStyle{...}
  28.  
  29. class CheckBoxStyleNoFocusDraw_Windows: public QWindowsStyle{...}
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