Allocating Memory for the Drag Operation

To prepare for the drag operation, the source must invoke DrgAllocDraginfo to allocate memory for the DRAGINFO data structure. DrgAllocDraginfo initializes the DRAGINFO data structure as follows:

cbDraginfo

The size, in bytes, of the entire DRAGINFO data structure, including the DRAGITEM array
cbDragitem
The size, in bytes, of each DRAGITEM data structure
usOperation
DO_DEFAULT
xDrop and yDrop
The current mouse-pointer location, in desktop coordinates
cditem
The count of objects being dragged, as specified in DrgAllocDraginfo.

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