ACC2000:
How to Capture Screen Shots of Your Forms
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The
information in this article applies to:
Advanced: Requires expert coding,
interoperability, and multiuser skills.
You can use Microsoft Windows API functions to
capture screen shots of any object on the Windows desktop. You can capture
screen shots of the Access user interface, Access objects, other Windows
applications, or the entire desktop.
Microsoft provides programming examples for illustration only, without warranty
either expressed or implied, including, but not limited to, the implied
warranties of merchantability and/or fitness for a particular purpose. This
article assumes that you are familiar with the programming language being
demonstrated and the tools used to create and debug procedures. Microsoft
support professionals can help explain the functionality of a particular
procedure, but they will not modify these examples to provide added
functionality or construct procedures to meet your specific needs. If you have
limited programming experience, you may want to contact a Microsoft Certified
Partner or the Microsoft fee-based consulting line at (800) 936-5200. For more
information about Microsoft Certified Partners, please see the following page
on the World Wide Web:
http://www.microsoft.com/partner/referral/
For
more information about the support options available from Microsoft, please see
the following page on the World Wide Web:
http://support.microsoft.com/directory/overview.asp
The following sample Visual Basic for Applications
code captures an object on the screen in the Clipboard. Note that you can
change the handle, AccessHwnd, in the sample code below to create screen shots
of other applications, including specific objects within Access.
After capturing a screen shot, you can open Paint (MSPaint.exe) and click the Paste
command on the Edit menu. The screen shot from Access then appears in
Paint as an image.
To run this code, call the ScreenDump() function from an event, a macro,
or the module's Debug window. To run ScreenDump() from the Immediate
window, type the following, and then press ENTER:
?ScreenDump()
To
set up the ScreenDump() function, open a new or existing module and type
or paste the following code.
NOTE: You may have some Microsoft Windows API functions defined in an
existing Microsoft Access library; therefore, your declarations may be
duplicates. If you receive a duplicate procedure name error message, remove or
comment out the declarations statement in your code.
Option Compare DatabaseOption Explicit Type RECT_Type left As Long top As Long right As Long bottom As Long End Type 'The following declare statements are case sensitive. Declare Function GetActiveWindow Lib "User32" () As LongDeclare Function GetDesktopWindow Lib "User32" () As LongDeclare Sub GetWindowRect Lib "User32" (ByVal Hwnd As Long, _ lpRect As RECT_Type)Declare Function GetDC Lib "User32" (ByVal Hwnd As Long) As LongDeclare Function CreateCompatibleDC Lib "Gdi32" (ByVal hdc As Long) _ As LongDeclare Function CreateCompatibleBitmap Lib "Gdi32" (ByVal hdc _ As Long, ByVal nWidth As Long, _ ByVal nHeight As Long) As LongDeclare Function SelectObject Lib "Gdi32" (ByVal hdc As Long, _ ByVal hObject As Long) As LongDeclare Function BitBlt Lib "Gdi32" (ByVal hDestDC As Long, _ ByVal X As Long, ByVal Y _ As Long, ByVal nWidth As Long, _ ByVal nHeight As Long, _ ByVal hSrcDC As Long, _ ByVal XSrc As Long, _ ByVal YSrc As Long, _ ByVal dwRop As Long) As LongDeclare Function OpenClipboard Lib "User32" (ByVal Hwnd As Long) As LongDeclare Function EmptyClipboard Lib "User32" () As LongDeclare Function SetClipboardData Lib "User32" (ByVal wFormat As Long, _ ByVal hMem As Long) As LongDeclare Function CloseClipboard Lib "User32" () As LongDeclare Function ReleaseDC Lib "User32" (ByVal Hwnd As Long, _ ByVal hdc As Long) As LongDeclare Function DeleteDC Lib "Gdi32" (ByVal hdc As Long) As Long Global Const SRCCOPY = &HCC0020Global Const CF_BITMAP = 2
Type
the following function in the General section of the module:
Function ScreenDump() Dim AccessHwnd As Long, DeskHwnd As Long Dim hdc As Long Dim hdcMem As Long Dim rect As RECT_Type Dim junk As Long Dim fwidth As Long, fheight As Long Dim hBitmap As Long DoCmd.Hourglass True '--------------------------------------------------- ' Get window handle to Windows and Microsoft Access '--------------------------------------------------- DeskHwnd = GetDesktopWindow() AccessHwnd = GetActiveWindow() '--------------------------------------------------- ' Get screen coordinates of Microsoft Access '--------------------------------------------------- Call GetWindowRect(AccessHwnd, rect) fwidth = rect.right - rect.left fheight = rect.bottom - rect.top '--------------------------------------------------- ' Get the device context of Desktop and allocate memory '--------------------------------------------------- hdc = GetDC(DeskHwnd) hdcMem = CreateCompatibleDC(hdc) hBitmap = CreateCompatibleBitmap(hdc, fwidth, fheight) If hBitmap <> 0 Then junk = SelectObject(hdcMem, hBitmap) '--------------------------------------------- ' Copy the Desktop bitmap to memory location ' based on Microsoft Access coordinates. '--------------------------------------------- junk = BitBlt(hdcMem, 0, 0, fwidth, fheight, hdc, rect.left, _ rect.top, SRCCOPY) '--------------------------------------------- ' Set up the Clipboard and copy bitmap '--------------------------------------------- junk = OpenClipboard(DeskHwnd) junk = EmptyClipboard() junk = SetClipboardData(CF_BITMAP, hBitmap) junk = CloseClipboard() End If '--------------------------------------------- ' Clean up handles '--------------------------------------------- junk = DeleteDC(hdcMem) junk = ReleaseDC(DeskHwnd, hdc) DoCmd.Hourglass False End Function