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How to drag a file from a VB.NET form TO Windows Explorer
I have a VB.NET Application with a treeview. Within this treeview, I have nodes that contain a filename and an ID. When the user clicks on a node, it saves the node's ID to a local variable. This ID can be used to retrieve the BLOB from a database for the file's byte array. What I've done so far is setup a DragLeave Event on the Treeview so if the user clicks and drags a file, the moment the file is dragged outside the Treeview, it saves the file from the database down to a local temp directory and saves this entire filename (including the directory) to a variable called TempFullFileName. The following is then run:
Dim dto as DataObject = New DataObject(DataFormats.Fil
DoDragDrop(dto, DragDropEffects.Copy)
I have checked everything up until this point - if I break on the "Dim dto" line, I can see the file has been created in the temp directory and I can double click on it which opens it just fine. Also, when I drag outside the treeview (or the application itself), I am getting the Copy cursor as I should. If I release the mouse button over the explorer window (or the desktop), however, nothing copies. Am I missing something here? Thanks!
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by: CyprexxDevPosted on 2008-06-03 at 15:15:36ID: 21705080
I figured out the answer right after I posted this... The TempFullFileName variable must be an array. Since I only have one at a time, I was using a variable of the type "string" instead of "String()". Once I changed it over to the string array, it worked fine.