WTSWaitSystemEvent function (wtsapi32.h)

Waits for a Remote Desktop Services event before returning to the caller.

BOOL WTSWaitSystemEvent(
  [in]  HANDLE hServer,
  [in]  DWORD  EventMask,
  [out] DWORD  *pEventFlags
);

[in] hServer

Handle to an RD Session Host server. Specify a handle opened by the WTSOpenServer function, or specify WTS_CURRENT_SERVER_HANDLE to indicate the RD Session Host server on which your application is running.

[in] EventMask

Bitmask that specifies the set of events to wait for. This mask can be WTS_EVENT_FLUSH to cause all pending WTSWaitSystemEvent calls on the specified RD Session Host server handle to return. Or, the mask can be a combination of the following values.

Wait for any event type.

A client connected to a WinStation.

A new WinStation was created.

An existing WinStation was deleted.

A client disconnected from a WinStation.

The Remote Desktop Services' license state changed. This occurs when a license is added or deleted using License Manager.

A user logged off from either the Remote Desktop Services console or from a client WinStation.

A user logged on to the system from either the Remote Desktop Services console or from a client WinStation.

An existing WinStation was renamed.

A WinStation connection state changed. For a list of connection states, see the WTS_CONNECTSTATE_CLASS enumeration type.

[out] pEventFlags

Pointer to a variable that receives a bitmask of the event or events that occurred. The returned mask can be a combination of the values from the previous list, or it can be WTS_EVENT_NONE if the wait terminated because of a WTSWaitSystemEvent call with WTS_EVENT_FLUSH.

If the function succeeds, the return value is a nonzero value.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

WTSOpenServer