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DL_CANCELDRAG


DL_CANCELDRAG 
    idCtl = (WPARAM)(int) wParam; 
    pDragInfo = (LPARAM)(LPDRAGLISTINFO) lParam;

Signals that the user has canceled a drag operation by clicking the right mouse button or pressing the ESC key. A drag list box sends DL_CANCELDRAG to its parent window in the form of a drag list message.

idCtl
Control identifier of the drag list box.
pDragInfo
Address of a DRAGLISTINFO structure that contains the DL_CANCELDRAG notification code, the handle to the drag list box, and the cursor position.

By processing the DL_CANCELDRAG notification message, an application can reset its internal state to indicate that dragging is not in effect.

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