比较系统版本

/************************************************************************/
/*判断系统的版本
 *win7：NT6.1 win8：NT6.2 
 *经验证:
(6,1)    (6,2)
 * win7   true     false
 * win8   true     true
 * xp     false
*/
/************************************************************************/

bool IsWinVerGreaterThan(DWORD dwMajorVersion, DWORD dwMinorVersion)

{

OSVERSIONINFOEXW osvi = {0};
DWORDLONG dwlConditionMask = 0;
BOOL bRes = FALSE;


ZeroMemory(&osvi, sizeof(osvi));
osvi.dwOSVersionInfoSize= sizeof(osvi);
osvi.dwMajorVersion= dwMajorVersion;
osvi.dwMinorVersion= dwMinorVersion;


// 主版本号判断
VER_SET_CONDITION(dwlConditionMask, VER_MAJORVERSION, VER_GREATER);
bRes = ::VerifyVersionInfoW(&osvi, VER_MAJORVERSION, dwlConditionMask);//经验证<=6返回true,>6返回false
if ( !bRes )
{
DWORD dwErr = GetLastError();
return false;
}


// 次版本号判断
VER_SET_CONDITION(dwlConditionMask, VER_MAJORVERSION, VER_EQUAL);
VER_SET_CONDITION(dwlConditionMask, VER_MINORVERSION, VER_GREATER);


bRes = ::VerifyVersionInfo(&osvi, VER_MAJORVERSION | VER_MINORVERSION, dwlConditionMask);
if ( !bRes )
{
DWORD dwErr = GetLastError();
return false;
}


return bRes;

}