Erfassen und Drucken eines Bildschirms, Formulars oder eines beliebigen Fensters

Dieser Artikel beschreibt, wie Sie ein Formular oder Fenster mit dem gesamten Bildschirm in einem Visual Basic-Picture-Objekt erfassen können. Wenn der Bildschirmdruck im Picture-Objekt erfasst wurde, kann er mit der Methode "PaintPicture" des Visual Basic-Printer-Objekts einfach gedruckt werden.

Im Beispiel weiter unten werden mehrere nützliche Routinen zur Erfassung von Bildern erläutert. Alle Routinen funktionieren unter 16-Bit- und 32-Bit-Windows-Plattformen und bieten vollständige Palettenunterstützung. Mit den im Beispiel erläuterten Routinen können Sie folgende Aufgaben ausführen:

• Erfassen des gesamten Inhalts eines Formulars
• Erfassen des Innenbereichs eines Formulars
• Erfassen des gesamten Bildschirms
• Erfassen des aktiven Fensters auf dem Bildschirm
• Erfassen eines beliebigen Teils von Fenstern mit einer Zugriffsnummer
• Erstellen eines Picture-Objekts aus einer Bitmap und einer Palette
• Drucken von Picture-Objekten in maximaler Größe

In Visual Basic 4.0 wurde ein neues Picture-Objekt eingeführt. Das Picture-Objekt ist ein OLE-Standardtyp und im CDK (Control Developer's Kit) dokumentiert.

Das CDK beinhaltet die Funktion "OleCreatePictureIndirect", mit der Sie neue Picture-Objekte in Visual Basic 4.0 erstellen können. Die Routine "CreateBitmapPicture" im Beispiel ruft "OleCreatePictureIndirect" auf, um ein Picture-Objekt von einer Zugriffsnummer für eine Bitmap oder eine Palette zu erstellen. Wenn das Picture-Objekt eine gültige Palette enthält, verwendet Visual Basic diese beim Rendern des Picture-Objekts auf dem Bildschirm oder Drucker. Die Routine "CreateBitmapPicture" wird von der Routine "CaptureWindow" verwendet, um Picture-Objekte zu erstellen, die eine Bitmap eines teilweisen oder ganzen Fensters enthalten.

Die Routine "CaptureWindow" im Beispiel erfasst jeden Teil eines Fensters, das eine Fensterzugriffsnummer hat. Die Routine enthält mehrere Parameter, mit denen der zu erfassende Teil des Fensters exakt festgelegt werden kann. "CaptureWindow" kopiert das Bild eines Fensters in eine neue Bitmap. Gleichzeitig wird überprüft, ob auf dem Bildschirm eine Palette vorhanden ist. Diese wird ggf. ebenfalls kopiert. "CaptureWindow" ruft anschließend "CreateBitmapPicture" auf, um eine Bitmap aus der neu erstellten Bitmap und Palette zu erstellen.

Die Routinen "CaptureForm", "CaptureClient", "CaptureScreen" und "CaptureActiveWindow" im Beispiel verwenden alle "CaptureWindow", um bestimmte Fenster zu erfassen. "CaptureForm" und "CaptureClient" rufen beide die Routine "CaptureWindow" auf und übergeben ihr die hWnd-Eigenschaft eines Form-Objekts. "CaptureScreen" ruft einfach die Zugriffsnummer für das Desktopfenster ab und ruft anschließend "CaptureWindow" auf. "CaptureActiveWindow" ruft gleichermaßen die Fensterzugriffsnummer des aktiven Fensters ab und ruft anschließend "CaptureWindow" auf.

Wenn das gewünschte Bild in einem Picture-Objekt erfasst ist, kann es in Visual Basic 4.0 einfach mit der Methode "PaintPicture" des Printer-Objekts gedruckt werden. Im Beispiel wird die Routine "PrintPictureToFitPage" bereitgestellt, die mit der Methode "PaintPicture" die erfassten Bilder in maximaler Größe im druckbaren Bereich der Seite druckt.

Beispiel

1. Erstellen Sie ein neues Projekt. "Form1" wird standardmäßig erstellt.
2. Setzen Sie entlang der linken Seite sechs Befehlsschaltflächen auf das Formular.
3. Setzen Sie rechts neben den Schaltflächen ein Bildfeld auf das Formular.
4. Geben Sie in "Form1" den folgenden Code ein:

         '--------------------------------------------------------------------
         ' Capture the entire screen.
   
         Private Sub Command1_Click()
            Set Picture1.Picture = CaptureScreen()
         End Sub
   
         ' Capture the entire form including title and border.
         Private Sub Command2_Click()
            Set Picture1.Picture = CaptureForm(Me)
         End Sub
   
         ' Capture the client area of the form.
         Private Sub Command3_Click()
            Set Picture1.Picture = CaptureClient(Me)
         End Sub
   
         ' Capture the active window after two seconds.
         Private Sub Command4_Click()
            MsgBox "Two seconds after you close this dialog " & _
               "the active window will be captured."
   
            ' Wait for two seconds.
            Dim EndTime As Date
            EndTime = DateAdd("s", 2, Now)
            Do Until Now > EndTime
               DoEvents
            Loop
   
            Set Picture1.Picture = CaptureActiveWindow()
   
            ' Set focus back to form.
            Me.SetFocus
         End Sub
   
         ' Print the current contents of the picture box.
         Private Sub Command5_Click()
            PrintPictureToFitPage Printer, Picture1.Picture
            Printer.EndDoc
         End Sub
   
         ' Clear out the picture box.
         Private Sub Command6_Click()
            Set Picture1.Picture = Nothing
         End Sub
   
         ' Initialize the form and controls.
         Private Sub Form_Load()
            Me.Caption = "Capture and Print Example"
            Command1.Caption = "&Screen"
            Command2.Caption = "&Form"
            Command3.Caption = "&Client"
            Command4.Caption = "&Active"
            Command5.Caption = "&Print"
            Command6.Caption = "C&lear"
            Picture1.AutoSize = True
         End Sub
         '--------------------------------------------------------------------
   
   					

5. Fügen Sie dem Projekt ein neues Standardmodul (standardmäßig "Modul1") hinzu.
6. Geben Sie in das neue Modul den folgenden Code ein:

         '--------------------------------------------------------------------
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         ' Visual Basic 4.0 16/32 Capture Routines
         '
         ' This module contains several routines for capturing windows into a
         ' picture.  All the routines work on both 16 and 32 bit Windows
         ' platforms.
         ' The routines also have palette support.
         '
         ' CreateBitmapPicture - Creates a picture object from a bitmap and
         ' palette.
         ' CaptureWindow - Captures any window given a window handle.
         ' CaptureActiveWindow - Captures the active window on the desktop.
         ' CaptureForm - Captures the entire form.
         ' CaptureClient - Captures the client area of a form.
         ' CaptureScreen - Captures the entire screen.
         ' PrintPictureToFitPage - prints any picture as big as possible on
         ' the page.
         '
         ' NOTES
         '    - No error trapping is included in these routines.
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         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
   
         #If Win32 Then
   
            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
   
         #ElseIf Win16 Then
   
            Private Const RASTERCAPS As Integer = 38
            Private Const RC_PALETTE As Integer = &H100
            Private Const SIZEPALETTE As Integer = 104
   
            Private Type RECT
               Left As Integer
               Top As Integer
               Right As Integer
               Bottom As Integer
            End Type
   
            Private Declare Function CreateCompatibleDC Lib "GDI" ( _
               ByVal hDC As Integer) As Integer
            Private Declare Function CreateCompatibleBitmap Lib "GDI" ( _
               ByVal hDC As Integer, ByVal nWidth As Integer, _
               ByVal nHeight As Integer) As Integer
            Private Declare Function GetDeviceCaps Lib "GDI" ( _
               ByVal hDC As Integer, ByVal iCapabilitiy As Integer) As Integer
            Private Declare Function GetSystemPaletteEntries Lib "GDI" ( _
               ByVal hDC As Integer, ByVal wStartIndex As Integer, _
               ByVal wNumEntries As Integer, _
               lpPaletteEntries As PALETTEENTRY) As Integer
            Private Declare Function CreatePalette Lib "GDI" ( _
               lpLogPalette As LOGPALETTE) As Integer
            Private Declare Function SelectObject Lib "GDI" ( _
               ByVal hDC As Integer, ByVal hObject As Integer) As Integer
            Private Declare Function BitBlt Lib "GDI" ( _
               ByVal hDCDest As Integer, ByVal XDest As Integer, _
               ByVal YDest As Integer, ByVal nWidth As Integer, _
               ByVal nHeight As Integer, ByVal hDCSrc As Integer, _
               ByVal XSrc As Integer, ByVal YSrc As Integer, _
               ByVal dwRop As Long) As Integer
            Private Declare Function DeleteDC Lib "GDI" ( _
               ByVal hDC As Integer) As Integer
            Private Declare Function GetForegroundWindow Lib "USER" _
               Alias "GetActiveWindow" () As Integer
            Private Declare Function SelectPalette Lib "USER" ( _
               ByVal hDC As Integer, ByVal hPalette As Integer, ByVal _
               bForceBackground As Integer) As Integer
            Private Declare Function RealizePalette Lib "USER" ( _
               ByVal hDC As Integer) As Integer
            Private Declare Function GetWindowDC Lib "USER" ( _
               ByVal hWnd As Integer) As Integer
            Private Declare Function GetDC Lib "USER" ( _
               ByVal hWnd As Integer) As Integer
            Private Declare Function GetWindowRect Lib "USER" ( _
               ByVal hWnd As Integer, lpRect As RECT) As Integer
            Private Declare Function ReleaseDC Lib "USER" ( _
               ByVal hWnd As Integer, ByVal hDC As Integer) As Integer
            Private Declare Function GetDesktopWindow Lib "USER" () As Integer
   
            Private Type PicBmp
               Size As Integer
               Type As Integer
               hBmp As Integer
               hPal As Integer
               Reserved As Integer
            End Type
   
            Private Declare Function OleCreatePictureIndirect _
               Lib "oc25.dll" ( PictDesc As PicBmp, RefIID As GUID, _
               ByVal fPictureOwnsHandle As Integer, IPic As IPicture) _
               As Integer
   
         #End If
   
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         ' 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.
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         #If Win32 Then
            Public Function CreateBitmapPicture(ByVal hBmp As Long, _
               ByVal hPal As Long) As Picture
   
               Dim r As Long
         #ElseIf Win16 Then
            Public Function CreateBitmapPicture(ByVal hBmp As Integer, _
               ByVal hPal As Integer) As Picture
   
               Dim r As Integer
         #End If
            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
   
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         ' 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.
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         ''''''
         '
         #If Win32 Then
            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
         #ElseIf Win16 Then
            Public Function CaptureWindow(ByVal hWndSrc As Integer, _
               ByVal Client As Boolean, ByVal LeftSrc As Integer, _
               ByVal TopSrc As Integer, ByVal WidthSrc As Long, _
               ByVal HeightSrc As Long) As Picture
   
               Dim hDCMemory As Integer
               Dim hBmp As Integer
               Dim hBmpPrev As Integer
               Dim r As Integer
               Dim hDCSrc As Integer
               Dim hPal As Integer
               Dim hPalPrev As Integer
               Dim RasterCapsScrn As Integer
               Dim HasPaletteScrn As Integer
               Dim PaletteSizeScrn As Integer
         #End If
            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
   
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         ' CaptureScreen
         '    - Captures the entire screen.
         '
         ' Returns
         '    - Returns a Picture object containing a bitmap of the screen.
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         Public Function CaptureScreen() As Picture
            #If Win32 Then
               Dim hWndScreen As Long
            #ElseIf Win16 Then
               Dim hWndScreen As Integer
            #End If
   
            ' Get a handle to the desktop window.
            hWndScreen = GetDesktopWindow()
   
            ' Call CaptureWindow to capture the entire desktop give the handle
            ' and return the resulting Picture object.
   
            Set CaptureScreen = CaptureWindow(hWndScreen, False, 0, 0, _
               Screen.Width \ Screen.TwipsPerPixelX, _
               Screen.Height \ Screen.TwipsPerPixelY)
         End Function
   
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         ' CaptureForm
         '    - Captures an entire form including title bar and border.
         '
         ' frmSrc
         '    - The Form object to capture.
         '
         ' Returns
         '    - Returns a Picture object containing a bitmap of the entire
         '      form.
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         Public Function CaptureForm(frmSrc As Form) As Picture
            ' Call CaptureWindow to capture the entire form given its window
            ' handle and then return the resulting Picture object.
            Set CaptureForm = CaptureWindow(frmSrc.hWnd, False, 0, 0, _
               frmSrc.ScaleX(frmSrc.Width, vbTwips, vbPixels), _
               frmSrc.ScaleY(frmSrc.Height, vbTwips, vbPixels))
         End Function
   
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         ' CaptureClient
         '    - Captures the client area of a form.
         '
         ' frmSrc
         '    - The Form object to capture.
         '
         ' Returns
         '    - Returns a Picture object containing a bitmap of the form's
         '      client area.
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         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
   
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         ' CaptureActiveWindow
         '    - Captures the currently active window on the screen.
         '
         ' Returns
         '    - Returns a Picture object containing a bitmap of the active
         '      window.
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         Public Function CaptureActiveWindow() As Picture
            #If Win32 Then
               Dim hWndActive As Long
               Dim r As Long
            #ElseIf Win16 Then
               Dim hWndActive As Integer
               Dim r As Integer
            #End If
            Dim RectActive As RECT
   
            ' Get a handle to the active/foreground window.
            hWndActive = GetForegroundWindow()
   
            ' Get the dimensions of the window.
            r = GetWindowRect(hWndActive, RectActive)
   
            ' Call CaptureWindow to capture the active window given its
            ' handle and return the Resulting Picture object.
         Set CaptureActiveWindow = CaptureWindow(hWndActive, False, 0, 0, _
               RectActive.Right - RectActive.Left, _
               RectActive.Bottom - RectActive.Top)
         End Function
   
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         ' PrintPictureToFitPage
         '    - Prints a Picture object as big as possible.
         '
         ' Prn
         '    - Destination Printer object.
         '
         ' Pic
         '    - Source Picture object.
         '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
         '
         Public Sub PrintPictureToFitPage(Prn As Printer, Pic As Picture)
            Const vbHiMetric As Integer = 8
            Dim PicRatio As Double
            Dim PrnWidth As Double
            Dim PrnHeight As Double
            Dim PrnRatio As Double
            Dim PrnPicWidth As Double
            Dim PrnPicHeight As Double
   
            ' Determine if picture should be printed in landscape or portrait
            ' and set the orientation.
            If Pic.Height >= Pic.Width Then
               Prn.Orientation = vbPRORPortrait   ' Taller than wide.
            Else
               Prn.Orientation = vbPRORLandscape  ' Wider than tall.
            End If
   
            ' Calculate device independent Width-to-Height ratio for picture.
            PicRatio = Pic.Width / Pic.Height
   
            ' Calculate the dimentions of the printable area in HiMetric.
            PrnWidth = Prn.ScaleX(Prn.ScaleWidth, Prn.ScaleMode, vbHiMetric)
            PrnHeight = Prn.ScaleY(Prn.ScaleHeight, Prn.ScaleMode, vbHiMetric)
            ' Calculate device independent Width to Height ratio for printer.
            PrnRatio = PrnWidth / PrnHeight
   
            ' Scale the output to the printable area.
            If PicRatio >= PrnRatio Then
               ' Scale picture to fit full width of printable area.
               PrnPicWidth = Prn.ScaleX(PrnWidth, vbHiMetric, Prn.ScaleMode)
               PrnPicHeight = Prn.ScaleY(PrnWidth / PicRatio, vbHiMetric, _
                  Prn.ScaleMode)
            Else
               ' Scale picture to fit full height of printable area.
               PrnPicHeight = Prn.ScaleY(PrnHeight, vbHiMetric, Prn.ScaleMode)
               PrnPicWidth = Prn.ScaleX(PrnHeight * PicRatio, vbHiMetric, _
                  Prn.ScaleMode)
            End If
   
            ' Print the picture using the PaintPicture method.
            Prn.PaintPicture Pic, 0, 0, PrnPicWidth, PrnPicHeight
         End Sub
         '--------------------------------------------------------------------
   					

7. Speichern Sie das Projekt.
8. Stellen Sie sicher, dass in den Projektverweisen ein Verweis auf die OLE-Automatisierung (StdOle2.tlb) vorhanden ist, bevor Sie das Projekt ausführen.
9. Führen Sie das Projekt aus, und testen Sie es. Sie sollten das Formular, den Innenbereich des Formulars, den Bildschirm und das aktive Fenster erfassen können. Alle genannten Objekte können nun auch gedruckt werden.

Hinweis: Nachdem Sie das Bild in einem Picture-Objekt erfasst haben, können Sie es mit der Methode "SetData" des Clipboard-Objekts einfach in der Zwischenablage ablegen.

Weitere Informationen finden Sie in folgenden Artikeln der Microsoft Knowledge Base: