vb屏幕截图压缩代码

'Option Explicit
Option Base 0

Private Type PALETTEENTRY
   peRed As Byte
   peGreen As Byte
   peBlue As Byte
   peFlags As Byte
End Type

Private Type LOGPALETTE
   palVersion As Integer
   palNumEntries As Integer
   palPalEntry(255) As PALETTEENTRY  ' Enough for 256 colors.
End Type

Private Type GUID
   Data1 As Long
   Data2 As Integer
   Data3 As Integer
   Data4(7) As Byte
End Type

Private Const RASTERCAPS As Long = 38
Private Const RC_PALETTE As Long = &H100
Private Const SIZEPALETTE As Long = 104

Private Type RECT
   Left As Long
   Top As Long
   Right As Long
   Bottom As Long
End Type

Private Declare Function CreateCompatibleDC Lib "GDI32" (ByVal hDC As Long) As Long
Private Declare Function CreateCompatibleBitmap Lib "GDI32" (ByVal hDC As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function GetDeviceCaps Lib "GDI32" (ByVal hDC As Long, ByVal iCapabilitiy As Long) As Long
Private Declare Function GetSystemPaletteEntries Lib "GDI32" (ByVal hDC As Long, ByVal wStartIndex As Long, ByVal wNumEntries As Long, lpPaletteEntries As PALETTEENTRY) As Long
Private Declare Function CreatePalette Lib "GDI32" (lpLogPalette As LOGPALETTE) As Long
Private Declare Function SelectObject Lib "GDI32" (ByVal hDC As Long, ByVal hObject As Long) As Long
Private Declare Function BitBlt Lib "GDI32" (ByVal hDCDest As Long, ByVal XDest As Long, ByVal YDest As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hDCSrc As Long, ByVal XSrc As Long, ByVal YSrc As Long, ByVal dwRop As Long) As Long
Private Declare Function DeleteDC Lib "GDI32" (ByVal hDC As Long) As Long
Private Declare Function GetForegroundWindow Lib "USER32" () As Long
Private Declare Function SelectPalette Lib "GDI32" (ByVal hDC As Long, ByVal hPalette As Long, ByVal bForceBackground As Long) As Long
Private Declare Function RealizePalette Lib "GDI32" (ByVal hDC As Long) As Long
Private Declare Function GetWindowDC Lib "USER32" (ByVal hWnd As Long) As Long
Private Declare Function GetDC Lib "USER32" (ByVal hWnd As Long) As Long
Private Declare Function GetWindowRect Lib "USER32" (ByVal hWnd As Long, lpRect As RECT) As Long
Private Declare Function ReleaseDC Lib "USER32" (ByVal hWnd As Long, ByVal hDC As Long) As Long
Private Declare Function GetDesktopWindow Lib "USER32" () As Long

Private Type PicBmp
   Size As Long
   Type As Long
   hBmp As Long
   hPal As Long
   Reserved As Long
End Type

Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As PicBmp, RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPicture) As Long

Private Sub Command1_Click()
Set wordapp = CreateObject("Word.Application")
x = App.Path & "/tmp/tmp2.doc"
Set worddoc = wordapp.Documents.Open(x)

End Sub

Private Sub Command2_Click()
Set Picture1.Picture = CaptureClient(Me)
 CommonDialog1.InitDir = App.Path & "/tmp"
 
 
CommonDialog1.FileName = "tmp.jpg"
CommonDialog1.DefaultExt = ".jpg"
CommonDialog1.Filter = "Bitmap Image (*.jpg)|*.jpg"
CommonDialog1.ShowSave
If CommonDialog1.FileName <> "" Then
    SavePicture Picture1.Picture, CommonDialog1.FileName
End If
End Sub
Public Function CaptureClient(frmSrc As Form) As Picture
   ' Call CaptureWindow to capture the client area of the form given
   ' its window handle and return the resulting Picture object.
   Set CaptureClient = CaptureWindow(frmSrc.hWnd, True, 0, 0, frmSrc.ScaleX(frmSrc.ScaleWidth, frmSrc.ScaleMode, vbPixels), frmSrc.ScaleY(frmSrc.ScaleHeight, frmSrc.ScaleMode, vbPixels))
End Function
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'
' CaptureWindow
'    - Captures any portion of a window.
'
' hWndSrc
'    - Handle to the window to be captured.
'
' Client
'    - If True CaptureWindow captures from the client area of the
'      window.
'    - If False CaptureWindow captures from the entire window.
'
' LeftSrc, TopSrc, WidthSrc, HeightSrc
'    - Specify the portion of the window to capture.
'    - Dimensions need to be specified in pixels.
'
' Returns
'    - Returns a Picture object containing a bitmap of the specified
'      portion of the window that was captured.
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''''''
'
Public Function CaptureWindow(ByVal hWndSrc As Long, ByVal Client As Boolean, ByVal LeftSrc As Long, ByVal TopSrc As Long, ByVal WidthSrc As Long, ByVal HeightSrc As Long) As Picture

  Dim hDCMemory As Long
  Dim hBmp As Long
  Dim hBmpPrev As Long
  Dim r As Long
  Dim hDCSrc As Long
  Dim hPal As Long
  Dim hPalPrev As Long
  Dim RasterCapsScrn As Long
  Dim HasPaletteScrn As Long
  Dim PaletteSizeScrn As Long
  Dim LogPal As LOGPALETTE

   ' Depending on the value of Client get the proper device context.
   If Client Then
      hDCSrc = GetDC(hWndSrc) ' Get device context for client area.
   Else
      hDCSrc = GetWindowDC(hWndSrc) ' Get device context for entire
                                    ' window.
   End If

   ' Create a memory device context for the copy process.
   hDCMemory = CreateCompatibleDC(hDCSrc)
   ' Create a bitmap and place it in the memory DC.
   hBmp = CreateCompatibleBitmap(hDCSrc, WidthSrc, HeightSrc)
   hBmpPrev = SelectObject(hDCMemory, hBmp)

   ' Get screen properties.
   RasterCapsScrn = GetDeviceCaps(hDCSrc, RASTERCAPS) ' Raster
                                                      ' capabilities.
   HasPaletteScrn = RasterCapsScrn And RC_PALETTE       ' Palette
                                                        ' support.
   PaletteSizeScrn = GetDeviceCaps(hDCSrc, SIZEPALETTE) ' Size of
                                                        ' palette.

   ' If the screen has a palette make a copy and realize it.
   If HasPaletteScrn And (PaletteSizeScrn = 256) Then
      ' Create a copy of the system palette.
      LogPal.palVersion = &H300
      LogPal.palNumEntries = 256
      r = GetSystemPaletteEntries(hDCSrc, 0, 256, LogPal.palPalEntry(0))
      hPal = CreatePalette(LogPal)
      ' Select the new palette into the memory DC and realize it.
      hPalPrev = SelectPalette(hDCMemory, hPal, 0)
      r = RealizePalette(hDCMemory)
   End If

   ' Copy the on-screen image into the memory DC.
   r = BitBlt(hDCMemory, 0, 0, WidthSrc, HeightSrc, hDCSrc, LeftSrc, TopSrc, vbSrcCopy)

' Remove the new copy of the  on-screen image.
   hBmp = SelectObject(hDCMemory, hBmpPrev)

   ' If the screen has a palette get back the palette that was
   ' selected in previously.
   If HasPaletteScrn And (PaletteSizeScrn = 256) Then
      hPal = SelectPalette(hDCMemory, hPalPrev, 0)
   End If

   ' Release the device context resources back to the system.
   r = DeleteDC(hDCMemory)
   r = ReleaseDC(hWndSrc, hDCSrc)

   ' Call CreateBitmapPicture to create a picture object from the
   ' bitmap and palette handles. Then return the resulting picture
   ' object.
   Set CaptureWindow = CreateBitmapPicture(hBmp, hPal)
End Function

 

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'
' CreateBitmapPicture
'    - Creates a bitmap type Picture object from a bitmap and
'      palette.
'
' hBmp
'    - Handle to a bitmap.
'
' hPal
'    - Handle to a Palette.
'    - Can be null if the bitmap doesn't use a palette.
'
' Returns
'    - Returns a Picture object containing the bitmap.
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'

Public Function CreateBitmapPicture(ByVal hBmp As Long, ByVal hPal As Long) As Picture
  Dim r As Long

   Dim Pic As PicBmp
   ' IPicture requires a reference to "Standard OLE Types."
   Dim IPic As IPicture
   Dim IID_IDispatch As GUID

   ' Fill in with IDispatch Interface ID.
   With IID_IDispatch
      .Data1 = &H20400
      .Data4(0) = &HC0
      .Data4(7) = &H46
   End With

   ' Fill Pic with necessary parts.
   With Pic
      .Size = Len(Pic)          ' Length of structure.
      .Type = vbPicTypeBitmap   ' Type of Picture (bitmap).
      .hBmp = hBmp              ' Handle to bitmap.
      .hPal = hPal              ' Handle to palette (may be null).
   End With

   ' Create Picture object.
   r = OleCreatePictureIndirect(Pic, IID_IDispatch, 1, IPic)

   ' Return the new Picture object.
   Set CreateBitmapPicture = IPic
End Function
 考下来可以直接用哦！^^