Using Win32 functions in Visual FoxPro Image Gallery
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Attaching menu to a top-level form

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Before you begin:
In this example menu is created and attached to a top-level VFP form. The System popup and a user-defined popup are inserted in the menu.



See also:
  • Adding user-defined items to the Control Menu of VFP form (requires VFP9)
  • Transparent Menu Class (requires VFP9)
  • Reading structure of menu attached to the main VFP window
  • Accessing Adobe Reader 7.0 main menu from VFP application

  •  
    PUBLIC frm
    frm = CreateObject("Tform")
    frm.Visible = .T.
     
    DEFINE CLASS Tform As Form
    PROTECTED hWindow, hMenu, hPopup, hSysPopup
        Autocenter=.T.
        ShowWindow=2  && this is important
     
    PROCEDURE Load
        THIS.declare
     
    PROCEDURE Init
        STORE 0 TO THIS.hWindow, THIS.hMenu,;
            THIS.hPopup, THIS.hSysPopup
     
    PROCEDURE Destroy
        * DestroyMenu is recursive, which means 
        * it destroys the menu including all submenus
        = DestroyMenu(THIS.hMenu)
     
    PROCEDURE Activate
        IF THIS.hWindow = 0
            THIS.InitMenu()
        ENDIF
     
    PROCEDURE InitMenu
    #DEFINE MF_STRING  0
        THIS.hWindow = GetFocus()
     
        THIS.hSysPopup = GetSystemMenu(THIS.hWindow, 0)
        THIS.hPopup = CreateMenu()
        = AppendMenu(THIS.hPopup, MF_STRING, 1, "Option &1")
        = AppendMenu(THIS.hPopup, MF_STRING, 1, "Option &2")
        = AppendMenu(THIS.hPopup, MF_STRING, 1, "Option &3")
     
        THIS.hMenu = CreateMenu()
        THIS.AddMenuItem(THIS.hMenu, 0, "&Form", THIS.hPopup)
        THIS.AddMenuItem(THIS.hMenu, 1, "&System", THIS.hSysPopup)
     
        = SetMenu(THIS.hWindow, THIS.hMenu)
     
    PROCEDURE AddMenuItem(hMenu, lnPosition, lcCaption, lnPopup)
    *| typedef struct tagMENUITEMINFO {
    *|   UINT    cbSize;         0:4
    *|   UINT    fMask;          4:4
    *|   UINT    fType;          8:4
    *|   UINT    fState;        12:4
    *|   UINT    wID;           16:4
    *|   HMENU   hSubMenu;      20:4
    *|   HBITMAP hbmpChecked;   24:4
    *|   HBITMAP hbmpUnchecked; 28:4
    *|   ULONG_PTR dwItemData;  32:4
    *|   LPTSTR  dwTypeData;    36:4
    *|   UINT    cch;           40:4
    *|   HBITMAP hbmpItem;      44:4
    *| } MENUITEMINFO, *LPMENUITEMINFO; total = 48 bytes
    #DEFINE MENUITEMINFO_SIZE  48
     
    #DEFINE MFT_STRING 0
    #DEFINE MIIM_STATE 1
    #DEFINE MIIM_ID 2
    #DEFINE MIIM_SUBMENU 4
    #DEFINE MIIM_TYPE 16
    #DEFINE MFS_ENABLED 0
     
        LOCAL lcMask, lcItemInfo, loCaption
        loCaption = CREATEOBJECT("PChar", lcCaption)
        lcMask = MIIM_STATE + MIIM_ID + MIIM_TYPE + MIIM_SUBMENU
     
        * fill MENUITEMINFO structure
        lcItemInfo =;
            num2dword(MENUITEMINFO_SIZE) +;
            num2dword(lcMask) +;
            num2dword(MFT_STRING) +;
            num2dword(MFS_ENABLED) +;
            num2dword(lnPosition) +;
            num2dword(lnPopup) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(loCaption.GetAddr()) +;
            num2dword(Len(lcCaption)) +;
            num2dword(0)
     
        = InsertMenuItem(hMenu, lnPosition, 1, @lcItemInfo)
    RETURN
     
    PROCEDURE declare
        DECLARE INTEGER GetFocus IN user32
        DECLARE INTEGER CreateMenu IN user32
        DECLARE INTEGER CreatePopupMenu IN user32
        DECLARE INTEGER DestroyMenu IN user32 INTEGER hMenu
     
        DECLARE INTEGER SetMenu IN user32;
            INTEGER hWindow, INTEGER hMenu
     
        DECLARE INTEGER GetSystemMenu IN user32;
            INTEGER hWindow, INTEGER bRevert
     
        DECLARE INTEGER AppendMenu IN user32;
            INTEGER hMenu, INTEGER uFlags,;
            INTEGER uIDNewItem, STRING @lpNewItem
     
        DECLARE INTEGER InsertMenuItem IN user32;
            INTEGER hMenu, INTEGER uItem,;
            INTEGER fByPosition, STRING @lpmii
    ENDDEFINE
     
    DEFINE CLASS PChar As Session
    PROTECTED hMem
     
    PROCEDURE Init(lcString)
        THIS.hMem = 0
        THIS.setValue(lcString)
     
    PROCEDURE Destroy
        THIS.ReleaseString
     
    FUNCTION GetAddr
    RETURN THIS.hMem
     
    FUNCTION GetValue
        LOCAL lnSize, lcBuffer
        lnSize = THIS.getAllocSize()
        lcBuffer = SPACE(lnSize)
     
        IF THIS.hMem <> 0
            DECLARE RtlMoveMemory IN kernel32 As MemToStr;
                STRING @, INTEGER, INTEGER
            = MemToStr(@lcBuffer, THIS.hMem, lnSize)
        ENDIF
    RETURN lcBuffer
     
    FUNCTION GetAllocSize
        DECLARE INTEGER GlobalSize IN kernel32 INTEGER hMem
    RETURN Iif(THIS.hMem=0, 0, GlobalSize(THIS.hMem))
     
    PROCEDURE SetValue(lcString)
    #DEFINE GMEM_FIXED 0 
        THIS.ReleaseString
     
        DECLARE INTEGER GlobalAlloc IN kernel32 INTEGER, INTEGER
        DECLARE RtlMoveMemory IN kernel32 As StrToMem;
            INTEGER, STRING @, INTEGER
     
        LOCAL lnSize
        lcString = lcString + Chr(0)
        lnSize = Len(lcString)
        THIS.hMem = GlobalAlloc(GMEM_FIXED, lnSize)
        IF THIS.hMem <> 0
            = StrToMem(THIS.hMem, @lcString, lnSize)
        ENDIF
     
    PROCEDURE ReleaseString
        IF THIS.hMem <> 0
            DECLARE INTEGER GlobalFree IN kernel32 INTEGER
            = GlobalFree (THIS.hMem)
            THIS.hMem = 0
        ENDIF
    ENDDEFINE
     
    FUNCTION num2dword(lnValue)
    #DEFINE m0 0x0000100
    #DEFINE m1 0x0010000
    #DEFINE m2 0x1000000
        IF lnValue < 0
            lnValue = 0x100000000 + lnValue
        ENDIF
        LOCAL b0, b1, b2, b3
        b3 = Int(lnValue/m2)
        b2 = Int((lnValue - b3*m2)/m1)
        b1 = Int((lnValue - b3*m2 - b2*m1)/m0)
        b0 = Mod(lnValue, m0)
    RETURN Chr(b0)+Chr(b1)+Chr(b2)+Chr(b3)
     
     
     

    User rating: 8.5/10 (2 votes)
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    4446 bytes  
    Created: 2001-12-09 11:26:57  
    Modified: 2006-05-18 08:46:40  
    Visits in 7 days: 16  
    Listed functions:
    AppendMenu
    CreateMenu
    CreatePopupMenu
    DestroyMenu
    GetFocus
    GetSystemMenu
    GlobalAlloc
    GlobalFree
    GlobalSize
    InsertMenuItem
    SetMenu
    Printer friendly API declarations
    My comment:
    Take a note that the ShowWindow property for the form should be set to 2. That means "a top-level form in which child forms can be placed".

    See also:
  • BINDEVENT()
  • ShowWindow
  • Adding a Menu to a Top-Level Form.
  • Word Index links for this example:
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    User Contributed Notes:
    Carlos Alloatti | 2006-05-08 11:44:43
    Maybe with VFP 9 Bindevent to window messages this can be made to react to user selections?
    64.229.225.52 | 2006-05-08 13:45:00
    Carlos, this example is quite old. I should have it rewritten logn time ago.

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