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TVM_CREATEDRAGIMAGE message

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Creates a dragging bitmap for the specified item in a tree-view control. The message also creates an image list for the bitmap and adds the bitmap to the image list. An application can display the image when dragging the item by using the image list functions. You can send this message explicitly or by using the TreeView_CreateDragImage macro.

Parameters

wParam

Must be zero.

lParam

Handle to the item that receives the new dragging bitmap.

Return value

Returns the handle to the image list to which the dragging bitmap was added if successful, or NULL otherwise.

Remarks

If you create a tree-view control without an associated image list, you cannot use the TVM_CREATEDRAGIMAGE message to create the image to display during a drag operation. You must implement your own method of creating a drag cursor.

Your application is responsible for destroying the image list when it is no longer needed.

Requirements

Requirement Value
Minimum supported client
 Windows Vista [desktop apps only]
Minimum supported server
 Windows Server 2003 [desktop apps only]
Header
Commctrl.h