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File Manager Drag and Drop to a VB4 form in NT3.51

Posted on 1997-05-20
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How do I get a VB4 form to accept drag and drop files from the file manager and then retrieve the filenames. I could do this in VB3 in Win 3.11 but the method doesn't work in VB4 and NT3.51.

The API calls DragAcceptFiles, DragQueryFiles and DragFinish turn on draggin and dropping, allow the filenames to be retrieved and stop dragging and droping respectively. But how do I detect the drop event (and how do I know my form was the one dropped on)?
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Question by:coons
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Expert Comment

by:tward
ID: 1426431
Try the following API calls:

DragAcceptFiles, DragFinish: Support File Manager drag/drop file ability.

I haven't had time to get them to work yet but here are some declarations:

Declare Sub DragAcceptFiles Lib "shell32.dll" Alias "DragAcceptFiles" (ByVal hwnd As Long, ByVal fAccept As Long)

Declare Function DragDetect Lib "user32" Alias "DragDetect" (ByVal hWnd As Long, ByVal pt As POINTAPI) As Boolean

Declare Sub DragFinish Lib "shell32.dll" Alias "DragFinish" (ByVal hDrop As Long)

Declare Function DragObject Lib "user32" Alias "DragObject" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal un As Long, ByVal dw As Long, ByVal hCursor As Long) As Long

Declare Function DragQueryFile Lib "shell32.dll" Alias "DragQueryFileA" (ByVal HDROP As Long, ByVal UINT As Long, ByVal lpStr As String, ByVal ch As Long) As Long

Declare Function DragQueryPoint Lib "shell32.dll" Alias "DragQueryPoint" (ByVal HDROP As Long, lpPoint As POINTAPI) As Long
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by:coons
ID: 1426432
Edited text of question
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Author Comment

by:coons
ID: 1426433
How do I detect the drop event (see new question text)?
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Accepted Solution

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tward earned 100 total points
ID: 1426434
The only way that I have seen is through a program that can hook into the messages.  You have to trap the WM_DROPFILES Message.  There are several Shareware OCX's that hook into the messages.  One that comes to mind is Message Blaster.
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