函数原型：

BOOL WTSEnumerateSessions(  HANDLE hServer,

                                                      DWORD Reserved,

                                                      DWORD Version,

                                                      PWTS_SESSION_INFO* ppSessionInfo,

                                                      DWORD* pCount

                                                    );

作用：对当前系统的session信息进行枚举。

参数说明：

hServer：指定要对终端断服务枚举的句柄，本机可以的话可以为WTS_CURRENT_SERVER_HANDLE， 或者NULL

Reserved：系统保留位，必须为0

Version：指定枚举请求的版本，必须为1

ppSessionInfo：一个WTS_SESSION_INFO结构

可以看一下该结构的定义：

typedef struct _WTS_SESSION_INFO

{

     DWORD SessionId;

     LPTSTR pWinStationName;

     WTS_CONNECTSTATE_CLASS State;

 } WTS_SESSION_INFO, * PWTS_SESSION_INFO;

该结构中包含绘画ID， Windows空间站名，session的状态，此状态为枚举值。再次看下一结构

typedef enum _WTS_CONNECTSTATE_CLASS

{

    WTSActive,              // User logged on to WinStation

    WTSConnected,           // WinStation connected to client

    WTSConnectQuery,        // In the process of connecting to client

    WTSShadow,              // Shadowing another WinStation

    WTSDisconnected,        // WinStation logged on without client

    WTSIdle,                // Waiting for client to connect

    WTSListen,              // WinStation is listening for connection

    WTSReset,               // WinStation is being reset

    WTSDown,                // WinStation is down due to error

    WTSInit,                // WinStation in initialization

} WTS_CONNECTSTATE_CLASS;

pCount：返回Session的数量，为输出参数

举例说明：

   void main（）

   {

        PWTS_SESSION_INFO psi;

	DWORD dwCount;

	BOOL bRet = WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE, 0, 1, &psi, &dwCount);

	if (!bRet)

		return 0;

	wstring strName;

	for (unsigned int i = 0; i < dwCount; i ++)

	{

		printf("%s \t", psi[i].pWinStationName);

		printf("%d \t", psi[i].SessionId);

		printf("%d \n", psi[i].State);

	}

	WTSFreeMemory(psi);

    }