获得windows操作系统的版本

        CString sOSInfo, sTmp;
	OSVERSIONINFOEX osvi;
	BOOL bOsVersionInfoEx;

	// Try calling GetVersionEx using the OSVERSIONINFOEX structure.
	// If that fails, try using the OSVERSIONINFO structure.

	ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

	if( !(bOsVersionInfoEx = GetVersionEx ((OSVERSIONINFO *) &osvi)) )
	{
		osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
		if (! GetVersionEx ( (OSVERSIONINFO *) &osvi) ) 
			return FALSE;
	}

	switch (osvi.dwPlatformId)
	{
		// Test for the Windows NT product family.
	case VER_PLATFORM_WIN32_NT:
		if ( osvi.dwMajorVersion > 5)
			sOSInfo = "Microsoft Windows Vista, ";

		// Test for the specific product family.
		if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2 )
			sOSInfo = "Microsoft Windows Server 2003 family, ";

		if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1 )
			sOSInfo = "Microsoft Windows XP ";

		if ( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0 )
			sOSInfo = "Microsoft Windows 2000 ";

		if ( osvi.dwMajorVersion <= 4 )
			sOSInfo = "Microsoft Windows NT ";

		// Test for specific product on Windows NT 4.0 SP6 and later.
		if( bOsVersionInfoEx )
		{
			// Test for the workstation type.
			if ( osvi.wProductType == VER_NT_WORKSTATION )
			{
				if( osvi.dwMajorVersion == 4 )
					sOSInfo += "Workstation 4.0 ";
				else if( osvi.wSuiteMask & VER_SUITE_PERSONAL )
					sOSInfo += "Home Edition ";
				else
					sOSInfo += "Professional ";
			}

			// Test for the server type.
			else if ( osvi.wProductType == VER_NT_SERVER )
			{
				if( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2 )
				{
					if( osvi.wSuiteMask & VER_SUITE_DATACENTER )
						sOSInfo += "Datacenter Edition ";
					else if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )
						sOSInfo += "Enterprise Edition ";
					else if ( osvi.wSuiteMask == VER_SUITE_BLADE )
						sOSInfo += "Web Edition ";
					else
						sOSInfo += "Standard Edition ";
				}

				else if( osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0 )
				{
					if( osvi.wSuiteMask & VER_SUITE_DATACENTER )
						sOSInfo += "Datacenter Server ";
					else if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )
						sOSInfo += "Advanced Server ";
					else
						sOSInfo += "Server ";
				}

				else  // Windows NT 4.0 
				{
					if( osvi.wSuiteMask & VER_SUITE_ENTERPRISE )
						sOSInfo += "Server 4.0, Enterprise Edition ";
					else
						sOSInfo += "Server 4.0 ";
				}
			}
		}
		else  // Test for specific product on Windows NT 4.0 SP5 and earlier
		{
			HKEY hKey;
			char szProductType[BUFSIZE];
			DWORD dwBufLen=BUFSIZE;
			LONG lRet;

			lRet = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
				"SYSTEM//CurrentControlSet//Control//ProductOptions",
				0, KEY_QUERY_VALUE, &hKey );
			if( lRet != ERROR_SUCCESS )
				return FALSE;

			lRet = RegQueryValueEx( hKey, "ProductType", NULL, NULL,
				(LPBYTE) szProductType, &dwBufLen);
			if( (lRet != ERROR_SUCCESS) || (dwBufLen > BUFSIZE) )
				return FALSE;

			RegCloseKey( hKey );

			if ( lstrcmpi( "WINNT", szProductType) == 0 )
				printf( "Workstation " );
			if ( lstrcmpi( "LANMANNT", szProductType) == 0 )
				printf( "Server " );
			if ( lstrcmpi( "SERVERNT", szProductType) == 0 )
				sOSInfo += "Advanced Server ";

			sTmp.Format( "%d.%d ", osvi.dwMajorVersion, osvi.dwMinorVersion );
			sOSInfo += sTmp;
		}

		// Display service pack (if any) and build number.

		if( osvi.dwMajorVersion == 4 && 
			lstrcmpi( osvi.szCSDVersion, "Service Pack 6" ) == 0 )
		{
			HKEY hKey;
			LONG lRet;

			// Test for SP6 versus SP6a.
			lRet = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
				"SOFTWARE//Microsoft//Windows NT//CurrentVersion//Hotfix//Q246009",
				0, KEY_QUERY_VALUE, &hKey );
			if( lRet == ERROR_SUCCESS )
			{
				sTmp.Format( "Service Pack 6a (Build %d)/n", osvi.dwBuildNumber & 0xFFFF ); 
				sOSInfo += sTmp;
			}
			else // Windows NT 4.0 prior to SP6a
			{
				sTmp.Format( "%s (Build %d)/n",
					osvi.szCSDVersion,
					osvi.dwBuildNumber & 0xFFFF);
				sOSInfo += sTmp;
			}

			RegCloseKey( hKey );
		}
		else // Windows NT 3.51 and earlier or Windows 2000 and later
		{
			sTmp.Format( "%s (Build %d)/n",
				osvi.szCSDVersion,
				osvi.dwBuildNumber & 0xFFFF);
			sOSInfo += sTmp;
		}


		break;

		// Test for the Windows 95 product family.
	case VER_PLATFORM_WIN32_WINDOWS:

		if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 0)
		{
			sOSInfo = "Microsoft Windows 95 ";
			if ( osvi.szCSDVersion[1] == &apos;C&apos; || osvi.szCSDVersion[1] == &apos;B&apos; )
				sOSInfo += "OSR2 ";
		} 

		if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 10)
		{
			sOSInfo = "Microsoft Windows 98 ";
			if ( osvi.szCSDVersion[1] == &apos;A&apos; )
				sOSInfo += "SE ";
		} 

		if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 90)
		{
			sOSInfo = "Microsoft Windows Millennium Edition/n";
		} 
		break;

	case VER_PLATFORM_WIN32s:

		sOSInfo += "Microsoft Win32s/n";
		break;
	}
	return sOSInfo;

获得Windows操作系统的版本信息：（从MSDN拷贝，加了一句话而已）

我的系统版本信息：Microsoft Windows Vista, Home Edition  (Build 6000)