MLM_UNDO

This message performs any available undo operation.

Syntax

param1
ULONG ulReserved; /* Reserved value, should be 0. */

param2
ULONG ulReserved; /* Reserved value, should be 0. */

Parameters

ulReserved (ULONG) - input

Reserved value, should be 0.

ulReserved (ULONG) - input

Reserved value, should be 0.

Returns

rc (USHORT) - return

Success indicator.

TRUE: An undo operation was performed.

FALSE: No undo operation was performed.

Remarks

The last operation is undone (note that an undo can be undone). This can cause an overflow, see MLN_OVERFLOW.

Default Processing

The default window procedure takes no action on this message, other than to set rc to FALSE.