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Copy or paste files to the clipboard as Explorer does

Copy or paste files to the clipboard as Explorer does

API Declarations


' * Programmer Name : Karl E. Peterson
' * Web Site : http://www.mvps.org/vb
' * E-Mail : [email protected]
' * Date : 11/11/98
' * Time : 12:40
' * Module Name : MClipFileCopy
' * Module Filename : MClipFileCopy.bas
' **********************************************************************
' * Comments :
' *
' *
' * Copyright (C)1995-98,
' *
' * Author grants royalty-free rights to use this code within
' * compiled applications. Selling or otherwise distributing
' * this source code is not allowed without author's express
' * permission.
' *************************************************************

Option Explicit

' Required data structures
Private Type POINTAPI
x As Long
y As Long
End Type

' Clipboard Manager Functions
Private Declare Function EmptyClipboard Lib "user32" () As Long
Private Declare Function OpenClipboard Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function CloseClipboard Lib "user32" () As Long
Private Declare Function SetClipboardData Lib "user32" (ByVal wFormat As Long, ByVal hMem As Long) As Long
Private Declare Function GetClipboardData Lib "user32" (ByVal wFormat As Long) As Long
Private Declare Function IsClipboardFormatAvailable Lib "user32" (ByVal wFormat As Long) As Long

' Other required Win32 APIs
Private 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
Private Declare Function DragQueryPoint Lib "shell32.dll" (ByVal hDrop As Long, lpPoint As POINTAPI) As Long
Private Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Private Declare Function GlobalFree Lib "kernel32" (ByVal hMem As Long) As Long
Private Declare Function GlobalLock Lib "kernel32" (ByVal hMem As Long) As Long
Private Declare Function GlobalUnlock Lib "kernel32" (ByVal hMem As Long) As Long
Private Declare Sub CopyMem Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)

' Predefined Clipboard Formats
Private Const CF_TEXT = 1
Private Const CF_BITMAP = 2
Private Const CF_METAFILEPICT = 3
Private Const CF_SYLK = 4
Private Const CF_DIF = 5
Private Const CF_TIFF = 6
Private Const CF_OEMTEXT = 7
Private Const CF_DIB = 8
Private Const CF_PALETTE = 9
Private Const CF_PENDATA = 10
Private Const CF_RIFF = 11
Private Const CF_WAVE = 12
Private Const CF_UNICODETEXT = 13
Private Const CF_ENHMETAFILE = 14
Private Const CF_HDROP = 15
Private Const CF_LOCALE = 16
Private Const CF_MAX = 17

' New shell-oriented clipboard formats
Private Const CFSTR_SHELLIDLIST As String = "Shell IDList Array"
Private Const CFSTR_SHELLIDLISTOFFSET As String = "Shell Object Offsets"
Private Const CFSTR_NETRESOURCES As String = "Net Resource"
Private Const CFSTR_FILEDESCRIPTOR As String = "FileGroupDescriptor"
Private Const CFSTR_FILECONTENTS As String = "FileContents"
Private Const CFSTR_FILENAME As String = "FileName"
Private Const CFSTR_PRINTERGROUP As String = "PrinterFriendlyName"
Private Const CFSTR_FILENAMEMAP As String = "FileNameMap"

' Global Memory Flags
Private Const GMEM_FIXED = &H0
Private Const GMEM_MOVEABLE = &H2
Private Const GMEM_NOCOMPACT = &H10
Private Const GMEM_NODISCARD = &H20
Private Const GMEM_ZEROINIT = &H40
Private Const GMEM_MODIFY = &H80
Private Const GMEM_DISCARDABLE = &H100
Private Const GMEM_NOT_BANKED = &H1000
Private Const GMEM_SHARE = &H2000
Private Const GMEM_DDESHARE = &H2000
Private Const GMEM_NOTIFY = &H4000
Private Const GMEM_LOWER = GMEM_NOT_BANKED
Private Const GMEM_VALID_FLAGS = &H7F72
Private Const GMEM_INVALID_HANDLE = &H8000
Private Const GHND = (GMEM_MOVEABLE Or GMEM_ZEROINIT)
Private Const GPTR = (GMEM_FIXED Or GMEM_ZEROINIT)

Private Type DROPFILES
pFiles As Long
pt As POINTAPI
fNC As Long
fWide As Long
End Type




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' * Programmer Name  : Karl E. Peterson
' * Web Site         : http://www.mvps.org/vb
' * E-Mail           : [email protected]
' * Date             : 11/11/98
' * Time             : 12:40
' * Module Name      : MClipFileCopy
' * Module Filename  : MClipFileCopy.bas
' **********************************************************************
' * Comments         :
' *
' *
' * Copyright (C)1995-98,
' *
' * Author grants royalty-free rights to use this code within
' * compiled applications. Selling or otherwise distributing
' * this source code is not allowed without author's express
' * permission.
' *************************************************************

Public Function ClipboardCopyFiles(Files() As String) As Boolean
   
   ' * Programmer Name  : Karl E. Peterson
   ' * Web Site         : www.geocities.com/ResearchTriangle/6311/
   ' * E-Mail           : [email protected]
   ' * Date             : 24/11/98
   ' * Time             : 13:07
   ' * Module Name      : ClipboardFiles_Module
   ' * Module Filename  : ClipboardFiles.bas
   ' * Procedure Name   : ClipboardCopyFiles
   ' * Parameters       :
   ' *                    Files() As String
   ' **********************************************************************
   ' * Comments         : Copy files to the clipboard
   ' *  Like in Explorer or something similar. You can paste them
   ' *  in explorer.
   ' *
   ' **********************************************************************
   
   Dim data       As String
   Dim df         As DROPFILES
   Dim hGlobal    As Long
   Dim lpGlobal   As Long
   Dim i          As Long
   
   ' Open and clear existing crud off clipboard.
   If OpenClipboard(0&) Then
      Call EmptyClipboard
      
      ' Build double-null terminated list of files.
      For i = LBound(Files) To UBound(Files)
         data = data & Files(i) & vbNullChar
      Next
      data = data & vbNullChar
      
      ' Allocate and get pointer to global memory,
      ' then copy file list to it.
      hGlobal = GlobalAlloc(GHND, Len(df) + Len(data))
      If hGlobal Then
         lpGlobal = GlobalLock(hGlobal)
         
         ' Build DROPFILES structure in global memory.
         df.pFiles = Len(df)
         Call CopyMem(ByVal lpGlobal, df, Len(df))
         Call CopyMem(ByVal (lpGlobal + Len(df)), ByVal data, Len(data))
         Call GlobalUnlock(hGlobal)
         
         ' Copy data to clipboard, and return success.
         If SetClipboardData(CF_HDROP, hGlobal) Then
            ClipboardCopyFiles = True
         End If
      End If
      
      ' Clean up
      Call CloseClipboard
   End If
   
End Function

Public Function ClipboardPasteFiles(Files() As String) As Long
   
   ' * Programmer Name  : Karl E. Peterson
   ' * Web Site         : www.geocities.com/ResearchTriangle/6311/
   ' * E-Mail           : [email protected]
   ' * Date             : 24/11/98
   ' * Time             : 13:07
   ' * Module Name      : ClipboardFiles_Module
   ' * Module Filename  : ClipboardFiles.bas
   ' * Procedure Name   : ClipboardPasteFiles
   ' * Parameters       :
   ' *                    Files() As String
   ' **********************************************************************
   ' * Comments         : Paste file coming from the clipboard
   ' *  Those files have been added by Explorer or something similar
   ' *
   ' **********************************************************************
   
   Dim hDrop         As Long
   Dim nFiles        As Long
   Dim i             As Long
   Dim desc          As String
   Dim filename      As String
   Dim pt            As POINTAPI
   Const MAX_PATH    As Long = 260
   
   ' Insure desired format is there, and open clipboard.
   If IsClipboardFormatAvailable(CF_HDROP) Then
      If OpenClipboard(0&) Then
         
         ' Get handle to Dropped Filelist data, and number of files.
         hDrop = GetClipboardData(CF_HDROP)
         nFiles = DragQueryFile(hDrop, -1&, "", 0)
         
         ' Allocate space for return and working variables.
         ReDim Files(0 To nFiles - 1) As String
         filename = Space(MAX_PATH)
         
         ' Retrieve each filename in Dropped Filelist.
         For i = 0 To nFiles - 1
            Call DragQueryFile(hDrop, i, filename, Len(filename))
            Files(i) = TrimNull(filename)
         Next
         
         ' Clean up
         Call CloseClipboard
      End If
      
      ' Assign return value equal to number of files dropped.
      ClipboardPasteFiles = nFiles
   End If
   
End Function

Private Function TrimNull(ByVal sTmp As String) As String
   
   Dim nNul As Long
   
   '
   ' Truncate input sTmpg at first Null.
   ' If no Nulls, perform ordinary Trim.
   '
   nNul = InStr(sTmp, vbNullChar)
   Select Case nNul
      Case Is > 1
         TrimNull = Left(sTmp, nNul - 1)
      Case 1
         TrimNull = ""
      Case 0
         TrimNull = Trim(sTmp)
   End Select
   
End Function