Windows API 23 篇 WTSQuerySessionInformation

函数原型：
BOOL
WINAPI
WTSQuerySessionInformationW(
                                                      IN HANDLE hServer,
                                                      IN DWORD SessionId,
                                                      IN WTS_INFO_CLASS WTSInfoClass,
                                                      __deref_out_bcount(*pBytesReturned) LPWSTR * ppBuffer,
                                                      __out DWORD * pBytesReturned
                                                      );
说明：
hServer： WTS_CURRENT_SERVER_HANDLE
SessionId：会话ID，可以从WTSEnumerateProcesses或者WTSEnumerateSessions 或WTSGetActiveConsoleSessionId
中得到，
WTSInfoClass：指定要查找的信息，该结构是一个枚举类型，可以看下面定义：
typedef enum _WTS_INFO_CLASS {

  WTSInitialProgram,
  WTSApplicationName,
WTSWorkingDirectory,
 WTSOEMId,

WTSSessionId,

WTSUserName,
 WTSWinStationName,
 WTSDomainName,

WTSConnectState,
 WTSClientBuildNumber,
 WTSClientName,

  WTSClientDirectory,

WTSClientProductId,
 WTSClientHardwareId,

WTSClientAddress,

WTSClientDisplay,

WTSClientProtocolType
 } WTS_INFO_CLASS;

ppBuffer:输出指针
pBytesReturned：返回信息的长度

DWORD dwSessionId = WTSGetActiveConsoleSessionId();
		PVOID pstr = NULL;
		DWORD dwLen = 0;
		WTSQuerySessionInformationW(WTS_CURRENT_SERVER_HANDLE, dwSessionId, WTS_INFO_CLASS::WTSUserName, (LPWSTR*)&pstr, &dwLen);

		wstring strUserName = (PWCHAR)pstr;