Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
How to change display settings: screen resolution, screen refresh rate
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Converting Unicode data from the Clipboard to a character string using a given code page
Enumerating data formats currently available on the clipboard
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
How to print FoxPro form
Obtaining current Internet Explorer browser version and UserAgent
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
How to create transparent areas inside a form -- punching holes in the form
Creating a clipping region from the path selected into the device context of a form
FindText -- the hopeless and useless Common Dialog
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Using the Semaphore object to allow only one instance of VFP application running
Retrieving graphic capabilities of default printer
Using EnumPrinters function to enumerate locally installed printers
Current keyboard type
Reading VFP settings from the Windows Registry
Enumerating Processes -- WinNT
Using FrameRgn for displaying system colors
How to save registry key including its subkeys and values to a file
Using the DeleteFile
Changing file attributes
How to initiate System shutdown
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: 183  
    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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