HM_UPDATE_OBJCOM_WINDOW_CHAIN

This message is sent to the currently active communication object by the communication object who wants to withdraw from the communication chain.

Syntax

param1
HWND hwnd; /* The handle of the object to be withdrawn from the communication chain. */

param2
HWND hwnd; /* Window containing the handle of the object to be replaced. */

Parameters

hwnd (HWND) - input

The handle of the object to be withdrawn from the communication

chain.

hwnd (HWND) - input

Window containing the handle of the object to be replaced.

Returns

ulReserved (ULONG) - return

Reserved value, should be 0.

Remarks

The object that receives this message should check to see if the object handle returned from HM_SET_OBJCOM_WINDOW is equal to the handle in param1. If the handle is equal, then the handle in param1 should be replaced by the handle in param2. If the handle is not equal and the handle previously received is not NULL HANDLE, then send HM_UPDATE_OBJCOM_WINDOW_CHAIN to that object.

Default Processing

None.