Using Win32 functions in Visual FoxPro Image Gallery
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Before you begin:
This code sample employs SHGetStockIconInfo Shell API function for retrieving information about system-defined Shell icons.

Here is a VFP form hosting ListView control with Windows Shell icons.

ICO files are neither created or required to run this code sample. For icons, the ListView connects directly to the system image list using icon index obtained through SHGetStockIconInfo call.

A Shell icon (actually any ICO resource from EXE or DLL file) can be stored to ICO file perfectly usable in VFP. Like this one, for example:

The Comment part down this page has more on it.

See also:
  • How to view icons stored in executable files
  • Displaying the associated icons and descriptions for files and folders
  • Converting image file to .ICO file
  • Storing DLL icon resources in image files
  • Storing DLL icon resources in .ICO files
  • Displaying icons in the system tray
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    9786 bytes  
    Created: 2011-01-17 15:43:32  
    Modified: 2011-01-27 08:12:08  
    Visits in 7 days: 132  
    Listed functions:
    DestroyIcon
    GetWindowLong
    GlobalAlloc
    GlobalFree
    GlobalSize
    SendMessage
    SetWindowLong
    SHGetFileInfo
    SHGetStockIconInfo
    Printer friendly API declarations
    My comment:
    When switched to Report mode (View=3), the ListView control displays the resource file and ICO resource index for each icon displayed (szPath and iIcon members of SHSTOCKICONINFO structure).

    That reveals that Windows 7 stores Shell icons in at least 4 files residing in System32 directory:
  • Shell32.dll
  • Imageres.dll
  • Imagesp1.dll
  • Mydocs.dll

    With known resource file and resource index, saving a Shell icon to ICO file is an easy task.

    Here is another code sample on this web site that explains how. It defines VFP classes IconGroupResource and IconResource. The former creates ICO files holding multiple versions of the same icon (size & color depth vary). The latter creates ICO files holding a single icon version, for example 48x48, 8 bit.


    Selected Windows iconsDownload a small selection of Windows icons from System32\Imageres.dll library.


    The code below stores Imageres.dll Icon resources to ICO files.
    oIconGroups = CREATEOBJECT("IconGroups",;
            GETENV("SystemRoot") + "\system32\imageres.dll")

    oIconGroups.EnumIconGroupResources
    ? "Icon groups:", oIconGroups.Count

    LOCAL cTargetPath, nGroupIndex, nIconIndex
    cTargetPath = GETDIR("", "Select ICO files destination folder.")

    IF NOT EMPTY(m.cTargetPath)
            SET SAFETY OFF
            nGroupIndex = 0

            FOR EACH oIconGroup IN oIconGroups
                    oIconGroup.SaveToFile(cTargetPath +;
                            "groupicon_" + TRANSFORM(nGroupIndex) + ".ico")

                    nIconIndex = 0
                    FOR EACH oIcon IN oIconGroup.icons
                            oIcon.SaveToFile(cTargetPath +;
                                    "icon_" +;
                                    TRANSFORM(nGroupIndex) + "_" +;
                                    TRANSFORM(nIconIndex) + "_" +;
                                    TRANSFORM(oIcon.resid) + ".ico")

                            nIconIndex = nIconIndex + 1
                    NEXT
                    nGroupIndex = nGroupIndex + 1
            NEXT
            SET SAFETY ON
    ENDIF

    Storing DLL icon resources in .ICO files

    * * *
    Another Icon Viewer code sample on this web site reads icons directly from .EXE or .DLL file calling ExtractIcon and GetIconInfo functions. If pointed at Shell32.dll, that viewer displays even larger number of icons then the one presented.

    But the former has a deficiency. The Shell icons are retrieved based on their respective resource index in Shell32.dll. This index may fluctuate through OS versions. In contrast, the SHGetStockIconInfo uses OS-approved SHSTOCKICONID enumeration.
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