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.