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Detect Windows-wide drag event

I need to able to detect if the mouse is currently in a drag state, as in if it's dragging a snippet of text or a file. This could not only be from my own app, but any other application running in Windows - even explorer itself.

I want to show a form on the edge of the screen if the object being dragged is a compatible object to be dropped in my app, for example - my app won't accept .lnk files, so I don't want to show the form if the object being dropped is a .lnk file. But I accept .png files, thus I want my form to appear.

This can only be done if I can check what is being dragged BEFORE its dropped on my form.

Any help will be appreciated.
Sep 6 '12 #1
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