Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Custom GDI+ class
How to change display settings: screen resolution, screen refresh rate
Obtaining names and positions for shortcuts located on the Windows Desktop
GDI+: Implementing image scrolling with inertia
Displaying dimmed window behind VFP top-level form
Storing content of the Clipboard to a bitmap file
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Displaying icons in the system tray (VFP9)
Detecting changes in connections to removable drives (VFP9)
How to print a bitmap file
How to load a user profile
How to print FoxPro form
Printing Image File, programmatically set print page orientation to landscape
Subclassing CommandButton control to create BackColor property
Windows Shell Icons displayed and exported to ICO files (Vista)
Moving shortcut to a specified position on the Windows Desktop
Custom FTP Class for Visual FoxPro application
Browsing Windows Known Folders (Special Folders)
Capturing keyboard activity of another application with the Raw Input API (VFP9)
How to copy the image of a form to the Clipboard using Bitmap API functions
Vertical Label control
Accessing Adobe Reader 7.0 main menu from VFP application
Storing screen shot of a form to bitmap file
Customizing the frame of top-level form: removing the standard frame (VFP9, Vista)
Reading and setting explicit Application User Model ID for the current process (Win7)

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Before you begin:
Application User Model IDs (AppUserModelIDs) are used extensively by the taskbar in Windows 7 and later systems to associate processes, files, and windows with a particular application.

See also:
  • Accessing the list of Windows Recent Documents
  • LOCAL oAppUserModel As AppUserModel
    oAppUserModel = CREATEOBJECT("AppUserModel")
    ? "[" + oAppUserModel.AppID + "]"
    oAppUserModel.AppID = "VFP.MyApplication.MainForm"
    ? "[" + oAppUserModel.AppID + "]"
    * end of main
    DEFINE CLASS AppUserModel As Custom
    * implements access to Application User Model ID (AppUserModelID) 
    * that identifies the current process to the taskbar
    PROCEDURE Init( cAppID As String )
        IF VAL(OS(3))*10 + VAL(OS(4)) < 61
            WAIT WINDOW "Minimum supported OS: Win7 !" TIMEOUT 10
            RETURN .F.
        IF NOT EMPTY(m.cAppID)
            THIS.AppID = m.cAppID
    PROCEDURE AppID_ASSIGN(vValue As Variant)
        LOCAL cAppID
        cAppID = TRANSFORM(m.vValue)
        * note: converted to Unicode
        THIS.ErrorCode = API_SetAppID(;
            STRCONV(m.cAppID,5) )
        IF THIS.ErrorCode = 0
        * you may need to hide and show
        * VFP main window to refresh its jump list
            THIS.AppID = m.cAppID
        LOCAL hAppID, cAppID, nBufSize
        THIS.ErrorCode = API_GetAppID( @hAppID )
        IF THIS.ErrorCode = 0
            nBufSize = GlobalSize( m.hAppID )
            cAppID = REPLICATE( CHR(0), nBufSize )
            MemToStr( @cAppID, hAppId, nBufSize )
            * note: converted from Unicode
            nBufSize = AT(CHR(0)+CHR(0), m.cAppID)
            IF nBufSize > 0
                cAppID = STRCONV(SUBSTR(m.cAppID, 1,;
                    m.nBufSize), 6)
            cAppID = ""
        IF hAppId <> 0
            = CoTaskMemFree( hAppId )
    RETURN m.cAppID
    PROCEDURE declare
        DECLARE INTEGER GlobalSize IN kernel32 INTEGER hMem
        DECLARE CoTaskMemFree IN Ole32 INTEGER hMem
        DECLARE RtlMoveMemory IN kernel32 As MemToStr;
        DECLARE SHORT GetCurrentProcessExplicitAppUserModelID IN Shell32;
        AS API_GetAppID;
            INTEGER @AppID
        DECLARE SHORT SetCurrentProcessExplicitAppUserModelID IN Shell32;
        AS API_SetAppID;
            STRING AppID

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    1937 bytes  
    Created: 2001-07-12 12:00:00  
    Modified: 2011-01-17 09:18:05  
    Visits in 7 days: 52  
    Listed functions:
    Printer friendly API declarations
    My comment:
    Read Application User Model IDs article on MSDN.

    Legacy applications do not declare an explicit AppUserModelID. In that case, the system uses a series of heuristics to assign an internal AppUserModelID. Applications cannot retrieve a system-assigned AppUserModelID.

    If an application uses an explicit AppUserModelID, it must also assign the same AppUserModelID to all running windows or processes, shortcuts, and file associations. It must also use that AppUserModelID when customizing its Jump List through ICustomDestinationList, and in any calls to SHAddToRecentDocs.

    * * *
    An explicit application ID better be created before the main application window shows on. When VFP main window appears on the screen, the system has already assigned a default application ID to this VFP instance.

    After setting an explicit application ID, hide and show again VFP main window. That refreshes the jump list attached to the VFP taskbar icon. That simple:
    _screen.Visible = .F.
    _screen.Visible = .T.

    Another option is using SCREEN=OFF and COMMAND settings in VFP configuration file. The COMMAND should start a program that sets application ID and then turns the main window on.

    * * *
    Setting application ID for an individual VFP top-level form requires access to the IPropertyStore interface. Apparently it can be done only through writing an external library. A fragment of such FLL is shown in C++ section of this code sample.

    * * *
    If a window owns an explicit application ID, calling the GetProp with this window handle and property name "{9F4C2855-9F79-4B39-A8D0-E1D42DE1D5F3} 5" returns valid data handle (IPropertyStore ?).
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