Using Win32 functions in Visual FoxPro Image Gallery
Keyboard Input
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ActivateKeyboardLayout
BlockInput
EnableWindow
GetActiveWindow
GetAsyncKeyState
GetFocus
GetKBCodePage
GetKeyboardLayout
GetKeyboardLayoutList
GetKeyboardLayoutName
GetKeyboardState
GetKeyNameText
GetKeyState
IsWindowEnabled
keybd_event
MapVirtualKey
RegisterHotKey
SetFocus
SetKeyboardState
ToAscii
UnregisterHotKey
VkKeyScan
Code examples:
Adding an ODBC data source with the SQLConfigDataSource; use automatic or interactive mode
Bitmap Class for Visual FoxPro application
Comparing dimensions of the VFP main window with _SCREEN properties
Configuring DEVMODE structure for a printer
Confining Windows calculator inside the VFP main window
Creating a window using CreateWindowEx function
Creating an Open dialog box to specify the drive, directory, and name of a file to open (Shell32 version)
Creating the Open dialog box to specify the drive, directory, and name of a file to open
Creating the Save dialog box to specify the drive, directory, and name of a file to save
Deleting files into the Recycle Bin
Displaying bitmap using the AlphaBlend function
Displaying printer-properties Property Sheet for the specified printer
Displaying system dialog that selects a folder
Drawing a rectangle using Windows regular edges and borders
Drawing a window caption using the DrawCaption routine
Drawing cursors for the classes defined by the system (preregistered): BUTTON, EDIT, LISTBOX etc.
Drawing icons associated with the VFP main window
Drawing Windows frame controls using the DrawFrameControl function
Drawing Windows predefined bitmaps using the LoadBitmap functions
Establishing connection using the SQLDriverConnect
Extended MessageBox Class
FindText -- the hopeless and useless Common Dialog
Form Magnifier
GetFocus returns a HWND value
Getting a bit more than the _CLIPTEXT offers
How to browse and connect to printers on a network (WinNT)
How to change the name and the size of the font in the MessageBox dialog
How to copy the image of a form to the Clipboard using Bitmap API functions
How to display a dialog box with which the user can add a data source (DSN)
How to display picture stored in enhanced-format metafile (*.emf)
How to display the port-configuration dialog box for a port on the specified server
How to display the Properties dialog box for a file (ShellExecuteEx)
How to make the caption of a VFP application flashing in the Windows task bar
How to play AVI file on the _screen
How to position the GETPRINTER() dialog
How to print a bitmap file
How to print picture stored in enhanced-format metafile (*.emf)
How to put a horizontal text scrolling on the form (a news line)
How to put a vertical text scrolling on the form (a movie cast)
How to remove a directory that is not empty
Initiating Inet connection using a modem
Locking mouse and keyboard input for the VFP application
Minimizing all running applications
Obtaining the bounding rectangle for the specified device context
Obtaining window class name for the main VFP window
Placing an arbitrary rectangular area of main VFP window on the Clipboard
Printing text on the client area of the main VFP window
Printing text on the main VFP window
Reading metrics for the currently selected font
Reading the structure of VFP main menu
Retrieving information about the main VFP window
Retrieving long values associated with the class of the VFP window
Retrieving Window Class information for the VFP window
Scanning the hierarchy of child windows down from the main VFP window
Sending a standard message with one or more attached files using default email client
Setting the mouse capture to the specified window
Simple MAPI: how to pick an email recipient from Outlook Express address book
Splash Screen for the VFP application
Starting a dialog box for connecting to network resources (mapping network drive)
Storing content of the Clipboard to a bitmap file
Terminating all running applications from a VFP program
Testing Clipboard functions: emptying the clipboard
The window and its ancestors
Using FlashWindowEx to flash the taskbar button of the VFP application
Using Font and Text functions
Using GetNearestColor
Using InternetGoOnline function
Using IsChild() for testing ThisForm.ShowWindow property
Using the ChooseColor function
Using the DrawText function
Using the GradientFill function
Using the IsWindowEnabled function
Using the LoadImage function to have a bitmap file loaded and displayed on VFP main window
Using the MessageBox Win32 function
Using the RestartDialog function -- restarting Windows
Who is the first in viewing the Clipboard
Who owns the Windows Clipboard
Reading the structure of VFP main menu

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Before you begin:
This code reads structure of main VFP window menu and saves it in an XML document (the Microsoft.XMLDOM object is used).

This is an output this code produces -- the structure of VFP9 main menu.

See also:
  • Transparent Menu on top-level form (requires VFP9)
  • How to hot-track menu item selection in top-level form
  • Adding user-defined items to the Control Menu of VFP form

  •  
    PRIVATE objXml, cTargetFile
    cTargetFile = "c:\temp\mnu.xml"  && replace with valid file name
     
    DECLARE INTEGER GetActiveWindow IN user32
    objXml = CREATEOBJECT("Tmenu", GetActiveWindow(), cTargetFile)
     
    IF TYPE("objXML") = "O"
        objXml.SaveXML
        objXml.ViewXml
    ELSE
        = MessageB("Invalid input parameters. ", 48, " Error")
    ENDIF
     
    DEFINE CLASS Tmenu As Custom
    PROTECTED hWindow, hMenu, xmldoc, rootnode, targetfile
     
    PROCEDURE Init(hwnd, cTargetFile)
        THIS.declare
     
        cTargetFile = FULLPATH(cTargetFile)
        IF PathFileExists(SUBS(cTargetFile, 1,RAT("\",cTargetFile))) = 0
            RETURN .F.  && invalid path
        ENDIF
     
        THIS.hWindow = hwnd
        THIS.hMenu = GetMenu(hwnd)
        IF IsMenu(THIS.hMenu) = 0
            RETURN .F.  && no menu found
        ENDIF
     
        WITH THIS
            .targetfile = cTargetFile
            .xmldoc = CreateObject("Microsoft.XMLDOM")
     
            .xmldoc.LoadXML(CHR(60)+[?xml version="1.0" ?]+CHR(62)+;
                CHR(60)+[TopMenu ]+CHR(47)+CHR(62))
     
            .rootnode = .xmldoc.documentElement()
            .SetProperty(.rootnode, "hWnd", m.hwnd)
            .DescribeNode(-1, .rootnode, .hMenu, 0,0)  && recursion
        ENDWITH
     
    PROCEDURE SaveXML
        THIS.xmldoc.Save(THIS.targetfile)
     
    PROCEDURE ViewXml
        = ShellExecute(0,"open", THIS.targetfile, "", "", 3)
     
    PROCEDURE DescribeNode(hParent, objNode, hMenu, lnItemIndex, lnItemID)
        LOCAL lnItemCount, objSubnode, hSubitem, lnIndex, lnID,;
            lnItemType, lnDataType, lnChecked, lnUnchecked, lnBitmap, lcItemType
     
        THIS.SetProperty(objNode, "hMenu", m.hMenu)
        THIS.SetProperty(objNode, "ItemIndex", m.lnItemIndex)
        THIS.SetProperty(objNode, "ItemID", m.lnItemID)
     
        IF hParent = -1  && root
            THIS.SetProperty(objNode, "WinCaption", THIS.GetWinCaption())
        ELSE
            STORE 0 TO lnItemType, lnDataType, lnBitmap, lnChecked, lnUnchecked
            THIS.GetItemData(hParent, lnItemIndex, @lnItemType,;
                @lnDataType, @lnChecked, @lnUnchecked, @lnBitmap)
     
            THIS.SetProperty(objNode, "ItemType", lnItemType)
            IF lnItemType <> 0
                lcItemType = THIS.GetItemTypeStr(lnItemType)
                THIS.SetProperty(objNode, "ItemTypeStr", lcItemType)
            ENDIF
            THIS.SetProperty(objNode, "DataType", lnDataType)
        ENDIF
     
        IF hMenu = -1
            RETURN
        ENDIF
     
        lnItemCount = GetMenuItemCount(m.hMenu)
        THIS.SetProperty(objNode, "ItemCount", m.lnItemCount)
     
        FOR lnIndex = 0 TO lnItemCount-1
            lnID = GetMenuItemID(m.hMenu, lnIndex)
            IF lnID = -1  && submenu
                objSubnode = THIS.xmldoc.CreateElement("SubMenu")
                hSubitem = THIS.GetSubmenuHandle(m.hMenu, m.lnIndex)
            ELSE  && menu item
                objSubnode = THIS.xmldoc.CreateElement("MenuItem")
                hSubitem = -1
            ENDIF
            objNode.AppendChild(objSubnode)
            THIS.DescribeNode(hMenu, objSubnode, hSubitem, lnIndex, lnID)
        ENDFOR
    RETURN
     
    PROCEDURE SetProperty(objNode, lcProperty, lvValue)
        LOCAL loProperty, loAttr, lcType
        loProperty = objNode.SelectSingleNode(lcProperty)
     
        IF TYPE("loProperty.Value") <> "C"
            loProperty = THIS.xmldoc.CreateElement(lcProperty)
            objNode.AppendChild(loProperty)
        ENDIF
     
        lcType = TYPE("lvValue")
        DO CASE
        CASE lcType = "C"
            lvValue = ALLTRIM(lvValue)
        CASE lcType = "L"
            lvValue = Iif(lvValue, "true","false")
        CASE lcType = "D"
            lvValue = DTOC(lvValue)
        CASE lcType = "T"
            lvValue = TTOC(lvValue)
        CASE lcType = "N"
            lvValue = LTRIM(STR(lvValue, 20))
        ENDCASE
        loProperty.Text = lvValue
     
    PROCEDURE declare
    #DEFINE MENUITEMINFO_SIZE 48
    #DEFINE MIIM_TYPE  16
    #DEFINE MIIM_SUBMENU 4
    #DEFINE MIIM_DATA 32
    #DEFINE MF_STRING 0
    #DEFINE MF_BITMAP 4
    #DEFINE MF_MENUBARBREAK 0x20
    #DEFINE MF_MENUBREAK 0x40
    #DEFINE MIIM_BITMAP 0x80
    #DEFINE MF_OWNERDRAW 0x100
    #DEFINE MFT_RADIOCHECK 0x200
    #DEFINE MF_SEPARATOR 0x800
    #DEFINE MFT_RIGHTORDER 0x2000
    #DEFINE MF_RIGHTJUSTIFY 0x4000
     
        DECLARE INTEGER GetObjectType IN gdi32 INTEGER h
        DECLARE INTEGER GetLastError IN kernel32
        DECLARE INTEGER GetMenu IN user32 INTEGER hWnd
        DECLARE INTEGER IsMenu IN user32 INTEGER hMenu
        DECLARE INTEGER PathFileExists IN shlwapi STRING pszPath
        DECLARE INTEGER GetMenuItemCount IN user32 INTEGER hMenu
        DECLARE INTEGER GetMenuItemID IN user32 INTEGER hMenu, INTEGER nPos
     
        DECLARE INTEGER ShellExecute IN shell32;
            INTEGER hwnd, STRING lpOperation, STRING lpFile,;
            STRING lpParams, STRING lpDir, INTEGER nShowCmd
     
        DECLARE INTEGER GetMenuItemInfo IN user32;
            INTEGER hMenu, INTEGER uItem, INTEGER fByPosition, STRING @lpmii
     
        DECLARE INTEGER GetMenuString IN user32;
            INTEGER hMenu, INTEGER uIDItem, STRING @lpString,;
            INTEGER @nMaxCount, INTEGER uFlag
     
        DECLARE INTEGER GetWindowText IN user32;
            INTEGER hwnd, STRING @lpString, INTEGER cch
     
    FUNCTION GetWinCaption
        LOCAL lcCaption
        lcCaption = SPACE(250)
        = GetWindowText(THIS.hWindow, @lcCaption, LEN(lcCaption))
    RETURN ALLTRIM(STRTRAN(lcCaption, Chr(0), ""))
     
    FUNCTION GetSubmenuHandle(hMenu, lnIndex)
        LOCAL lcBuffer
        lcBuffer = num2dword(MENUITEMINFO_SIZE) +;
            num2dword(MIIM_SUBMENU) + Repli(Chr(0), 40)
        = GetMenuItemInfo(hMenu, lnIndex, 1, @lcBuffer)
    RETURN buf2dword(SUBSTR(lcBuffer, 21,4))
     
    PROCEDURE GetItemData
    PARAM hMenu, lnIndex, lnIType, lnDType, lnChecked, lnUnchecked, lnBMP
        LOCAL lcBuffer, loItemData
        loItemData = CreateObject("PChar", Repli(Chr(0), 250))
        lcBuffer = num2dword(MENUITEMINFO_SIZE) +;
            num2dword(MIIM_TYPE+MIIM_DATA) + Repli(Chr(0), 28) +;
            num2dword(loItemData.hMem) + Repli(Chr(0), 8)
        = GetMenuItemInfo(hMenu, lnIndex, 1, @lcBuffer), lcBuffer
        lnIType = buf2dword(SUBSTR(lcBuffer, 9,4))
        lnDType = buf2dword(SUBSTR(lcBuffer, 37,4))
        lnBMP = buf2dword(SUBSTR(lcBuffer, 45,4))
     
    FUNCTION BTest(lnExpr, lnTest)
    RETURN BitAnd(lnExpr, lnTest) = lnTest
     
    FUNCTION GetItemTypeStr(lnType)
        LOCAL cType
        cType = ""
        cType = cType + Iif(THIS.BTest(lnType, MF_BITMAP),       "bitmap;", "")
        cType = cType + Iif(THIS.BTest(lnType, MF_MENUBARBREAK), "barbreak;","")
        cType = cType + Iif(THIS.BTest(lnType, MF_MENUBREAK),    "break;","")
        cType = cType + Iif(THIS.BTest(lnType, MIIM_BITMAP),     "xbitmap;","")
        cType = cType + Iif(THIS.BTest(lnType, MF_OWNERDRAW),    "owner;","")
        cType = cType + Iif(THIS.BTest(lnType, MFT_RADIOCHECK),  "radio;","")
        cType = cType + Iif(THIS.BTest(lnType, MF_SEPARATOR),    "separator;","")
        cType = cType + Iif(THIS.BTest(lnType, MFT_RIGHTORDER),  "rightord;","")
        cType = cType + Iif(THIS.BTest(lnType, MF_RIGHTJUSTIFY), "rightjust;","")
    RETURN cType
    ENDDEFINE
     
    DEFINE CLASS PChar As Custom
        hMem=0
     
    PROCEDURE Init(lcString)
        THIS.setValue(lcString)
    PROCEDURE Destroy
        THIS.ReleaseString
     
    PROCEDURE SetValue(lcString) && assigns new string value
    #DEFINE GMEM_FIXED 0 
        DECLARE INTEGER GlobalAlloc IN kernel32 INTEGER, INTEGER
        DECLARE RtlMoveMemory IN kernel32 As Str2Heap;
            INTEGER, STRING @, INTEGER
     
        LOCAL lnSize
     
        THIS.ReleaseString
        lcString = lcString + Chr(0)
        lnSize = Len(lcString)
     
        THIS.hMem = GlobalAlloc(GMEM_FIXED, lnSize)
        IF THIS.hMem <> 0
            = Str2Heap(THIS.hMem, @lcString, lnSize)
        ENDIF
     
    PROCEDURE ReleaseString  && releases allocated memory
        IF THIS.hMem <> 0
            DECLARE INTEGER GlobalFree IN kernel32 INTEGER
            = GlobalFree(THIS.hMem)
            THIS.hMem = 0
        ENDIF
    ENDDEFINE
     
    FUNCTION buf2dword(cBuffer)
    RETURN Asc(SUBSTR(cBuffer, 1,1)) + ;
        BitLShift(Asc(SUBSTR(cBuffer, 2,1)),  8) +;
        BitLShift(Asc(SUBSTR(cBuffer, 3,1)), 16) +;
        BitLShift(Asc(SUBSTR(cBuffer, 4,1)), 24)
     
    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: 10/10 (2 votes)
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    7678 bytes  
    Created: 2002-10-31 11:29:48  
    Modified: 2009-06-11 13:39:43  
    Visits in 7 days: 188  
    Listed functions:
    GetActiveWindow
    GetLastError
    GetMenu
    GetMenuItemCount
    GetMenuItemID
    GetMenuItemInfo
    GetMenuString
    GetObjectType
    GetWindowText
    GlobalAlloc
    GlobalFree
    IsMenu
    PathFileExists
    ShellExecute
    Printer friendly API declarations
    My comment:
    All VFP menu items are of OWNERDRAW type. That means the main VFP window receives at least two types of menu-related window messages: WM_MEASUREITEM and WM_DRAWITEM.

    The first one is received when a menu item is created. The second message -- every time an item has to be drawn or redrawn (for example, when selected or unselected).

    VFP9 allows intercepting window messages (BINDEVENT). So an application can receive and process the WM_DRAWITEM and other menu-related window messages.
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