OSVERSIONINFO

The OSVERSIONINFO data structure contains operating system version information. The information includes major and minor version numbers, a build number, a platform identifier, and descriptive text about the operating system. This structure is used with the GetVersionEx function.

typedef struct _OSVERSIONINFO{ 
    DWORD dwOSVersionInfoSize; 
    DWORD dwMajorVersion; 
    DWORD dwMinorVersion; 
    DWORD dwBuildNumber; 
    DWORD dwPlatformId; 
    TCHAR szCSDVersion[ 128 ]; 
} OSVERSIONINFO; 
 

Members

dwOSVersionInfoSize

Specifies the size, in bytes, of this data structure. Set this member to sizeof(OSVERSIONINFO) before calling the GetVersionEx function.

dwMajorVersion

Identifies the major version number of the operating system. For example, for Windows NT version 3.51, the major version number is 3; and for Windows NT version 4.0, the major version number is 4.

dwMinorVersion

Identifies the minor version number of the operating system. For example, for Windows NT version 3.51, the minor version number is 51; and for Windows NT version 4.0, the minor version number is 0.

dwBuildNumber

Windows NT: Identifies the build number of the operating system.

Windows 95: Identifies the build number of the operating system in the low-order word. The high-order word contains the major and minor version numbers.

dwPlatformId

Identifies the operating system platform. This member can be one of the following values:

Value	Platform
VER_PLATFORM_WIN32s	Win32s on Windows 3.1.
VER_PLATFORM_WIN32_WINDOWS	Win32 on Windows 95 or Windows 98. For Windows 95, dwMinorVersion is zero. For Windows 98, dwMinorVersion is greater than zero.
VER_PLATFORM_WIN32_NT	Win32 on Windows NT.

szCSDVersion

Windows NT: Contains a null-terminated string, such as "Service Pack 3", that indicates the latest Service Pack installed on the system. If no Service Pack has been installed, the string is empty.

Windows 95: Contains a null-terminated string that provides arbitrary additional information about the operating system.

QuickInfo

  Windows NT: Requires version 3.5 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in winbase.h.
  Unicode: Defined as Unicode and ANSI structures.

See Also

System Information Overview, System Information Structures, GetVersionEx, OSVERSIONINFOEX