Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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How to change display settings: screen resolution, screen refresh rate
GDI+: Storing content of the Clipboard to a bitmap file
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Adding and deleting Scheduled Tasks using NetScheduleJob API functions
How to set Creation Date/Time for a folder (WinNT)
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
HOWTO: Use the Win32 API to Access File Dates and Times
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Winsock: sending email messages (SMTP, port 25)
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Custom GDI+ class
How to display Windows On-Screen Keyboard
Enumerating data formats currently available on the clipboard
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
How to convert a bitmap file to monochrome format (1 bpp)
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Custom HttpRequest class (WinINet)
Converting Unicode data from the Clipboard to a character string using a given code page
Printing Image File, programmatically set print page orientation to landscape
How to adjust monitor brightness (Vista, monitor with DDC support)
How to detect if additional monitor is connected and active
How to create MD-5 and SHA-1 hash values from a string
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:

Download ScreenCapture Library

  • 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: 62  
    Listed functions:
    BitBlt
    CloseHandle
    CopyIcon
    CreateCompatibleBitmap
    CreateCompatibleDC
    CreateFile
    DeleteDC
    DeleteObject
    DestroyIcon
    DrawIcon
    GetCursorInfo
    GetDIBits
    GetFocus
    GetWindowDC
    GetWindowRect
    GlobalAlloc
    GlobalFree
    ReleaseDC
    SelectObject
    ShowCursor
    WriteFile
    Printer friendly API declarations
    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.
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