Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Custom GDI+ class
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Vertical Label control
Subclassing CommandButton control to create BackColor property
Storing content of the Clipboard to a bitmap file
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How to put a vertical text scrolling on the form (a movie cast)
How to put a horizontal text scrolling on the form (a news line, marquee)
Storing screen shot of a form to bitmap file
Bitmap Class for Visual FoxPro application
Playing WAV sounds simultaneously
Custom FTP Class for Visual FoxPro application
How to play AVI file on the _screen
Obtaining names and positions for shortcuts located on the Windows Desktop
Enumerating devices installed on the local machine
How to view icons stored in executable files (Icon Viewer) - II
Enumerating Processes -- WinNT
Passing data records between VFP applications via the Clipboard
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
CryptoAPI: Collection of Providers class
Monitoring clipboard content changes (VFP9)
Placing an arbitrary rectangular area of main VFP window on the Clipboard
Converting image file to .ICO file

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Before you begin:
This code sample shows how to load an image file (BMP, GIF, JPEG, PNG, TIFF), scale it and save as .ICO file. It creates a simple icon file containing one 32x32 icon in 32 bit per pixel format and assigns the new icon to the Icon property.

The code instantiates objects defined in custom GDI+ class. Download the class module first and save it in gdiplus.prg file.



See also:
  • How to extract icon resources from EXE or DLL and save them in image files
  • How to extract icon resources from EXE or DLL and save them in .ICO files
  • GDI+ function GdipCreateHICONFromBitmap

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    5525 bytes  
    Created: 2005-12-11 15:38:50  
    Modified: 2009-12-28 22:02:50  
    Visits in 7 days: 269  
    Listed functions:
    CreateCompatibleDC
    DeleteDC
    DeleteObject
    DestroyIcon
    GetDIBits
    GetIconInfo
    GetObject
    SelectObject
    Printer friendly API declarations
    My comment:
    As I can find, VFP supports only 16x16 and 32x32 icons. Also note that CLEAR RESOURCES is required in case an icon file is overwritten with new content while linked to the Icon property of a form or of the main VFP screen.

    * * *
    Worthy to read:
    Icons in Win32 by John Hornick, Microsoft Corp.

    * * *
    The bWidth and bHeight members of the ICONDIRENTRY structure occupy 1 byte each. This effectively restricts sizes of icons to 1..255 pixels range. While there are no other restrictions, common icon sizes include 16, 32, and 48 pixels square.

    Use GDI+ library to load an image file. If needed, scale it to a common icon size or to any size within 255 pixels.

    The GdipCreateHICONFromBitmap function creates HICON handle from the Bitmap GDI+ object. Use the GetIconInfo to obtain the ICONINFO structure, and the GetDIBits to retrieve the AND mask and XOR mask DIB bits.

    Calculate several other members of the ICONDIR, ICONDIRENTRY, BITMAPINFOHEADER and ICONIMAGE structures and save them to a .ICO file.

    * * *
    2007: .NET System.Drawing.Icon.Save method produces rather poor (should I say lousy) results, saving icons in something like 4 bpp format. Things might have changed since then.
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