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VB Petition

API: Copy variables/control contents to memory

Author(s)
Terry Kreft

    To copy a variable's or a control's content to memory, you must use API functions.  Although the built in RunCommand method does have a constant which allows you to copy data to clipboard, it's heavily dependent on controls on the form.  You must setFocus to the control and select the text first before you can use RunCommand on the selection.

    Here are a few functions which let you copy and paste data to/from clipboard.

'*********  Code Start  ************
' This code was originally written by Terry Kreft.
' It is not to be altered or distributed,
' except as part of an application.
' You are free to use it in any application,
' provided the copyright notice is left unchanged.
'
' Code Courtesy of
' Terry Kreft
'
Public Const GHND = &H42
Public Const CF_TEXT = 1
Private Const CF_ANSIONLY = &H400&
Private Const CF_APPLY = &H200&
Private Const CF_BITMAP = 2
Private Const CF_DIB = 8
Private Const CF_DIF = 5
Private Const CF_DSPBITMAP = &H82
Private Const CF_DSPENHMETAFILE = &H8E
Private Const CF_DSPMETAFILEPICT = &H83
Private Const CF_DSPTEXT = &H81
Private Const CF_EFFECTS = &H100&
Private Const CF_ENABLEHOOK = &H8&
Private Const CF_ENABLETEMPLATE = &H10&
Private Const CF_ENABLETEMPLATEHANDLE = &H20&
Private Const CF_ENHMETAFILE = 14
Private Const CF_FIXEDPITCHONLY = &H4000&
Private Const CF_FORCEFONTEXIST = &H10000
Private Const CF_GDIOBJFIRST = &H300
Private Const CF_GDIOBJLAST = &H3FF
Private Const CF_HDROP = 15
Private Const CF_INITTOLOGFONTSTRUCT = &H40&
Private Const CF_LIMITSIZE = &H2000&
Private Const CF_LOCALE = 16
Private Const CF_MAX = 17
Private Const CF_METAFILEPICT = 3
Private Const CF_NOFACESEL = &H80000
Private Const CF_NOSCRIPTSEL = &H800000
Private Const CF_NOSIMULATIONS = &H1000&
Private Const CF_NOSIZESEL = &H200000
Private Const CF_NOSTYLESEL = &H100000
Private Const CF_NOVECTORFONTS = &H800&
Private Const CF_NOOEMFONTS = CF_NOVECTORFONTS
Private Const CF_NOVERTFONTS = &H1000000
Private Const CF_OEMTEXT = 7
Private Const CF_OWNERDISPLAY = &H80
Private Const CF_PALETTE = 9
Private Const CF_PENDATA = 10
Private Const CF_PRINTERFONTS = &H2
Private Const CF_PRIVATEFIRST = &H200
Private Const CF_PRIVATELAST = &H2FF
Private Const CF_RIFF = 11
Private Const CF_SCALABLEONLY = &H20000
Private Const CF_SCREENFONTS = &H1
Private Const CF_BOTH = (CF_SCREENFONTS Or CF_PRINTERFONTS)
Private Const CF_SCRIPTSONLY = CF_ANSIONLY
Private Const CF_SELECTSCRIPT = &H400000
Private Const CF_SHOWHELP = &H4&
Private Const CF_SYLK = 4
Private Const CF_TIFF = 6
Private Const CF_TTONLY = &H40000
Private Const CF_UNICODETEXT = 13
Private Const CF_USESTYLE = &H80&
Private Const CF_WAVE = 12
Private Const CF_WYSIWYG = &H8000

Private Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags&, ByVal _
  dwBytes As Long) As Long
Private Declare Function GlobalLock Lib "kernel32" (ByVal hMem As Long) _
  As Long
Private Declare Function GlobalSize Lib "kernel32" (ByVal hMem As Long) _
  As Long
Private Declare Function lstrcpy Lib "kernel32" (ByVal lpString1 As Any, _
  ByVal lpString2 As Any) As Long
Private Declare Function lstrlen Lib "kernel32" Alias "lstrlenA" _
  (ByVal lpString As String) As Long

Private Declare Function GlobalUnlock Lib "kernel32" (ByVal hMem As Long) _
  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 GetClipboardData Lib "user32" (ByVal wFormat As _
  Long) As Long
Private Declare Function EmptyClipboard Lib "user32" () As Long
Private Declare Function SetClipboardData Lib "user32" (ByVal wFormat _
  As Long, ByVal hMem As Long) As Long

Function ClipBoard_SetText(strCopyString As String) As Boolean
  Dim hGlobalMemory As Long
  Dim lpGlobalMemory As Long
  Dim hClipMemory As Long

  ' Allocate moveable global memory.
  '-------------------------------------------
  hGlobalMemory = GlobalAlloc(GHND, Len(strCopyString) + 1)

  ' Lock the block to get a far pointer
  ' to this memory.
  lpGlobalMemory = GlobalLock(hGlobalMemory)

  ' Copy the string to this global memory.
  lpGlobalMemory = lstrcpy(lpGlobalMemory, strCopyString)

  ' Unlock the memory and then copy to the clipboard
  If GlobalUnlock(hGlobalMemory) = 0 Then
    If OpenClipboard(0&) <> 0 Then
      Call EmptyClipboard
      hClipMemory = SetClipboardData(CF_TEXT, hGlobalMemory)
      ClipBoard_SetText = CBool(CloseClipboard)
    End If
  End If
End Function

Function ClipBoard_GetText() As String
  Dim hClipMemory As Long
  Dim lpClipMemory As Long
  Dim strCBText As String
  Dim RetVal As Long
  Dim lngSize As Long
  If OpenClipboard(0&) <> 0 Then
    ' Obtain the handle to the global memory
    ' block that is referencing the text.
    hClipMemory = GetClipboardData(CF_TEXT)
    If hClipMemory <> 0 Then
      ' Lock Clipboard memory so we can reference
      ' the actual data string.
      lpClipMemory = GlobalLock(hClipMemory)
      If lpClipMemory <> 0 Then
        lngSize = GlobalSize(lpClipMemory)
        strCBText = Space$(lngSize)
        RetVal = lstrcpy(strCBText, lpClipMemory)
        RetVal = GlobalUnlock(hClipMemory)
        ' Peel off the null terminating character.
        strCBText = left(strCBText, InStr(1, strCBText, Chr$(0), 0) - 1)
      Else
        MsgBox "Could not lock memory to copy string from."
      End If
    End If
    Call CloseClipboard
  End If
  ClipBoard_GetText = strCBText
End Function

Function CopyOlePiccy(Piccy As Object)
  Dim hGlobalMemory As Long, lpGlobalMemory As Long
  Dim hClipMemory As Long, X As Long

  ' Allocate moveable global memory.
  '-------------------------------------------
  hGlobalMemory = GlobalAlloc(GHND, Len(Piccy) + 1)

  ' Lock the block to get a far pointer
  ' to this memory.
  lpGlobalMemory = GlobalLock(hGlobalMemory)


  'Need to copy the object to the memory here

  lpGlobalMemory = lstrcpy(lpGlobalMemory, Piccy)

  ' Unlock the memory.
  If GlobalUnlock(hGlobalMemory) <> 0 Then
    MsgBox "Could not unlock memory location. Copy aborted."
    GoTo OutOfHere2
  End If

  ' Open the Clipboard to copy data to.
  If OpenClipboard(0&) = 0 Then
    MsgBox "Could not open the Clipboard. Copy aborted."
    Exit Function
  End If

  ' Clear the Clipboard.
  X = EmptyClipboard()

  ' Copy the data to the Clipboard.
  hClipMemory = SetClipboardData(CF_TEXT, hGlobalMemory)

OutOfHere2:
  If CloseClipboard() = 0 Then
    MsgBox "Could not close Clipboard."
  End If
End Function
'*********  Code End   ************

1998-2010, Dev Ashish & Arvin Meyer, All rights reserved. Optimized for Microsoft Internet Explorer