操作系统	版本号
windows 10	10.0
windows Server 2016	10.0
windows 8.1	6.3
windows Server 2012 R2	6.3
windows 8	6.2
windows Server 2012	6.2
windows 7	6.1
windows Server 2008 R2	6.1
windows Server 2008	6.0
windows Vista	6.0
windows Server 2003 R2	5.2
windows XP 64-bit Edition	5.2
windows XP	5.1
windows 2000	5.0

通过系统Windows的API中GetVersionEx这个函数获取win8.1下的版本
win8.1以上的版本用GetVersionEx将获取不了，要用别的方法.

std::string vname;
//先判断是否为win8.1或win10
typedef void(__stdcall*NTPROC)(DWORD*, DWORD*, DWORD*);
HINSTANCE hinst = LoadLibrary("ntdll.dll");
DWORD dwMajor, dwMinor, dwBuildNumber;
NTPROC proc = (NTPROC)GetProcAddress(hinst, "RtlGetNtVersionNumbers"); 
proc(&dwMajor, &dwMinor, &dwBuildNumber); 
if (dwMajor == 6 && dwMinor == 3)	//win 8.1
{vname = "Microsoft Windows 8.1";printf_s("此电脑的版本为:%s\n", vname.c_str());return;
}
if (dwMajor == 10 && dwMinor == 0)	//win 10
{vname = "Microsoft Windows 10";printf_s("此电脑的版本为:%s\n", vname.c_str());return;
}

//判断win8.1以下的版本
SYSTEM_INFO info;                //用SYSTEM_INFO结构判断64位AMD处理器  
GetSystemInfo(&info);            //调用GetSystemInfo函数填充结构  
OSVERSIONINFOEX os;
os.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
#pragma warning(disable:4996)
if (GetVersionEx((OSVERSIONINFO *)&os))
{//下面根据版本信息判断操作系统名称  switch (os.dwMajorVersion){                        //判断主版本号  case 4:switch (os.dwMinorVersion){                //判断次版本号  case 0:if (os.dwPlatformId == VER_PLATFORM_WIN32_NT)vname ="Microsoft Windows NT 4.0";  //1996年7月发布  else if (os.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)vname = "Microsoft Windows 95";break;case 10:vname ="Microsoft Windows 98";break;case 90:vname = "Microsoft Windows Me";break;}break;case 5:switch (os.dwMinorVersion){               //再比较dwMinorVersion的值  case 0:vname = "Microsoft Windows 2000";    //1999年12月发布  break;case 1:vname = "Microsoft Windows XP";      //2001年8月发布  break;case 2:if (os.wProductType == VER_NT_WORKSTATION &&info.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)vname = "Microsoft Windows XP Professional x64 Edition";else if (GetSystemMetrics(SM_SERVERR2) == 0)vname = "Microsoft Windows Server 2003";   //2003年3月发布  else if (GetSystemMetrics(SM_SERVERR2) != 0)vname = "Microsoft Windows Server 2003 R2";break;}break;case 6:switch (os.dwMinorVersion){case 0:if (os.wProductType == VER_NT_WORKSTATION)vname = "Microsoft Windows Vista";elsevname = "Microsoft Windows Server 2008";   //服务器版本  break;case 1:if (os.wProductType == VER_NT_WORKSTATION)vname = "Microsoft Windows 7";elsevname = "Microsoft Windows Server 2008 R2";break;case 2:if (os.wProductType == VER_NT_WORKSTATION)vname = "Microsoft Windows 8";elsevname = "Microsoft Windows Server 2012";break;}break;default:vname = "未知操作系统";}printf_s("此电脑的版本为:%s\n", vname.c_str());
}
elseprintf_s("版本获取失败\n");