LbDragDrop




Type POINTAPI
x As Long
y As Long
End Type

Type MSG
hWnd As Long
message As Long
wParam As Long
lParam As Long
time As Long
pt As POINTAPI
End Type

Public Declare Sub DragAcceptFiles Lib "shell32.dll" _
(ByVal hWnd As Long, ByVal fAccept As Long)

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

Public 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

Public Declare Function PeekMessage Lib "user32" Alias "PeekMessageA" _
(lpMsg As MSG, ByVal hWnd As Long, ByVal wMsgFilterMin As Long, _
ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long

Public Const PM_NOREMOVE = &H0
Public Const PM_NOYIELD = &H2
Public Const PM_REMOVE = &H1
Public Const WM_DROPFILES = &H233

Private Sub Main()

'In order for this to function properly you should place of of your program

'execution code in the Sub Main(), Make sure you change the project startup

'to sub Main

Form1.Show

'This must be the last line! Nothing gets called after this

WatchForFiles

End Sub


Public Sub WatchForFiles()

'This watches for all WM_DROPFILES messages


Dim FileDropMessage As MSG 'Msg Type
Dim fileDropped As Boolean 'True if Files where dropped
Dim hDrop As Long 'Pointer to the dropped file structure
Dim filename As String * 128 'the dropped filename
Dim numOfDroppedFiles As Long 'the number of dropped files
Dim curFile As Long 'the current file number

'loop to keep checking for files

'NOTE: Do any code you want to execute before this set


Do

'check for Dropped file messages

fileDropped = PeekMessage(FileDropMessage, 0, _
WM_DROPFILES, WM_DROPFILES, PM_REMOVE Or PM_NOYIELD)

If fileDropped Then

'get the pointer to the dropped file structure

hDrop = FileDropMessage.wParam

'get the total number of files

numOfDroppedFiles = DragQueryFile(hDrop, True, filename, 127)

For curFile = 1 To numOfDroppedFiles

'get the file name

ret = DragQueryFile(hDrop, curFile - 1, filename, 127)

'at this pointer you can do what you want with the filename

'the filename will be a full qualified path

Form1.lblNumDropped = LTrim$(Str$(numOfDroppedFiles))
Form1.List1.AddItem filename

Next curFile

'we are now done with the structure, tell windows to discard it

DragFinish (hDrop)

End If

'be nice

DoEvents

Loop

End Sub

Private Sub Command1_Click()
'You can turn the form's / controls ability

'to accept the files by passing DragAcceptFiles

'the hWnd as the first parameter and True/False

'as the second parameter


If Command1.Caption = "&Accept Files" Then

'allow the application to accept files

DragAcceptFiles Form1.hWnd, True
Command1.Caption = "&Do Not Accept"

Else

DragAcceptFiles Form1.hWnd, False
Command1.Caption = "&Accept Files"

End If

End Sub


Private Sub Command2_Click()
'Clears the contents of the list box

List1.Clear
End Sub

Private Sub Command3_Click()
'end the program

Unload Me
End Sub












( lbdragdrop.html )- by Paolo Puglisi - Modifica del 17/12/2023