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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: 100  
    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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