OSVERSIONINFOEX WinVersion;

ZeroMemory(&WinVersion,sizeof(OSVERSIONINFOEX));

WinVersion.dwOSVersionInfoSize=sizeof(OSVERSIONINFOEX);

BOOL flag=(BOOL)GetVersionEx((OSVERSIONINFO *)&WinVersion);//得到当前版本号

float fSysVer = 0.;

fSysVer = WinVersion.dwMajorVersion + WinVersion.dwMinorVersion * 0.1;

win 95              4.0

win 98              4.1

win 2000win NT）      5.0

win xp（NT5.1）         5.1

win 2003          5.2

win Vista          6.0

win 7               6.1

typedef struct _OSVERSIONINFOEXW {

DWORD dwOSVersionInfoSize;

DWORD dwMajorVersion;

DWORD dwMinorVersion;

DWORD dwBuildNumber;

DWORD dwPlatformId;

WCHAR  szCSDVersion[ 128 ]; 

WORD  wServicePackMajor;

WORD  wServicePackMinor;

WORD  wSuiteMask;

BYTE  wProductType;

BYTE  wReserved;

}