View source for DM DISCARDOBJECT

This message is sent to a source that supports the "DRM_DISCARD" rendering method.
==Syntax==
<PRE>
param1
PDRAGINFO pDragInfo;   /* Pointer to the DRAGINFO structure representing the items to be discarded. */

mpparam2
MPARAM ulReserved;    /* Reserved value, should be NULL. */
</PRE>

==Parameters==
;pDragInfo (P[[DRAGINFO]]) - Input
: Pointer to the [[DRAGINFO]] structure representing the items to be discarded.
;ulReserved ([[MPARAM]]) - Input
: Reserved value, should be NULL.

==Returns==
;ulAction ([[ULONG]]) - returns
: Flag.
::DRR_SOURCE: The source window procedure accepts responsibility for the operation.
::DRR_TARGET: The target window procedure is to accept responsibility for the operation. The OS/2 shell supports the discarding of dragitems that can be rendered by the DRM_OS2FILE method.
::DRR_ABORT: Abort the entire [[DM_DROP]] action.

==Remarks==
This message is sent to the source window for the drag action. The source should make a copy of the parameters and return. The source should also create a separate thread to execute the discard action if it responds with DRR_SOURCE.

==Default Processing==
The [[WinDefWindowProc]] function does not expect to receive this message and takes no action on it, other than to set '''ulAction''' to the default value of NULL.

[[Category:Messages]]