获得操作系统版本

osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx (&osvi);

typedef struct _OSVERSIONINFOEX {
  DWORD dwOSVersionInfoSize;
  DWORD dwOSVersionInfoSize;
  DWORD dwMajorVersion;
  DWORD dwMinorVersion;
  DWORD dwMinorVersion;
  DWORD dwBuildNumber;
  DWORD dwPlatformId;
  TCHAR dwPlatformId;
  TCHAR szCSDVersion[128];
  WORD wServicePackMajor; //wServicePackMajor; //sp
  WORD wServicePackMinor;
  WORD wServicePackMinor;
  WORD wSuiteMask;
  BYTE wProductType;
  BYTE wProductType;
  BYTE wReserved;
} OSVERSIONINFOEX, 
*POSVERSIONINFOEX, 
*LPOSVERSIONINFOEX;

dwMajorVersion 
Major version number of the operating system. This member can be one of the following values.

    

        

            
Value
Meaning
        
        

            
4
            
Windows NT 4.0
        
        

            
5
            
Windows Server 2003, Windows XP, or Windows 2000
        
    

dwMinorVersion 
Minor version number of the operating system. This member can be one of the following values.

    

        

            
Value
Meaning
        
        

            
0
            
Windows 2000 or Windows NT 4.0
        
        

            
1
            
Windows XP
        
        

            
2
            
Windows Server 2003