Storing screen shot of a form to bitmap file -- Visual FoxPro : Using Win32 (WinAPI) Functions


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Storing screen shot of a form to bitmap file

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Before you begin:

Call this code from a VFP form to store its snapshot to a bitmap file (24-bpp). Make sure that the target file (m.lcFilename) is a valid path.

Check similar example Storing screen shot of a form to enhanced metafile (*.emf).

See also:

GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)

Printing the image of a FoxPro form

Storing clipboard contents to a BMP file

Using the LoadImage() to display a BMP file on the main VFP window

How to print a bitmap file


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9378 bytes
Created: 2001-11-05 20:12:41
Modified: 2011-03-28 09:42:56
Visits in 7 days: 140

Listed functions:

BitBlt
CloseHandle
CopyIcon
CreateCompatibleBitmap
CreateCompatibleDC
CreateFile
DeleteDC
DeleteObject
DestroyIcon
DrawIcon
GetCursorInfo
GetDIBits
GetFocus
GetWindowDC
GetWindowRect
GlobalAlloc
GlobalFree
ReleaseDC
SelectObject
ShowCursor
WriteFile

My comment:

The resulting file is forced to be in 24-bit format (24 bits per pixel). It is not compressed.

The part of DIB (Device-Independent Bitmap), that contains pixel data, can be too large for managing it via VFP strings. For that reason the GlobalAlloc/GlobalFree combination is used to allocate/release memory for this buffer.

The WriteFile function is declared in two different ways: one for strings and another for pointers.

Microsoft Knowledge Base Article - 161299
HOWTO: Capture and Print the Screen, a Form, or Any Window

* * *
April 5, 2006: a procedure added that draws current mouse cursor on the bitmap.

* * *
FileFormat.Info references on file extensions, file formats, MIME types, data conversion between formats and more.

Word Index links for this example:

screen shot of a form

storing screen shot of a form

clipboard contents to a bmp file

contents to a bmp file

storing clipboard contents to a bmp file

enhanced metafile

image of a foxpro form

printing the image of a foxpro form

device-independent bitmap

bmp file on the main vfp window

display a bmp file on the main

file extension

snapshot

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