Using Win32 functions in Visual FoxPro Image Gallery
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An alternative way of setting Form.Closable to False

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  • PUBLIC oForm
    oForm = CREATEOBJECT("TestForm")
    oForm.Visible = .T.
    
    DEFINE CLASS TestForm As Form
    #DEFINE SM_CXSIZE 30
    #DEFINE SM_CYSIZE 31
    #DEFINE SM_CXFRAME 32 
    #DEFINE SM_CYFRAME 33 
    #DEFINE RGN_XOR 3
    
        Width=500
        Height=300
        AutoCenter=.T.
        Caption="Closing button, ahem... disabled"
    
    PROCEDURE Load
        THIS.declare
    
    PROCEDURE Activate
        THIS.RegionOn
    
    PROCEDURE Resize
        THIS.RegionOn
    
    PROCEDURE RegionOn
        LOCAL lnBtnWidth, lnBtnHeight, hRgnBase,;
            hRgnExcl, hWindow, x1,y1
    
        * or use SYSMETRIC
        lnBtnWidth = GetSystemMetrics(SM_CXSIZE) +;
            GetSystemMetrics(SM_CXFRAME) + 1
    
        lnBtnHeight = GetSystemMetrics(SM_CYSIZE) +;
            GetSystemMetrics(SM_CYFRAME) + 1
    
        hWindow = GetFocus()
    *    hWindow = ThisForm.HWnd
        THIS.GetFormRect(hWindow, @x1,@y1)
    
        hRgnBase = CreateRectRgn(0,0,x1,y1)
    
        hRgnExcl = CreateRectRgn(x1-lnBtnWidth,0,;
            x1,lnBtnHeight)
    
        = CombineRgn(hRgnBase, hRgnBase,;
            hRgnExcl, RGN_XOR)
    
        = SetWindowRgn(hWindow, hRgnBase, 1)
        = DeleteObject(hRgnBase)
        = DeleteObject(hRgnExcl)
    
    PROCEDURE GetFormRect(hWindow, x1,y1) 
        LOCAL lpRect
        lpRect = SPACE(16)
        = GetWindowRect(hWindow, @lpRect)
    
        x1 = THIS.buf2dword(SUBSTR(lpRect, 9,4)) -;
            THIS.buf2dword(SUBSTR(lpRect, 1,4))
    
        y1 = THIS.buf2dword(SUBSTR(lpRect, 13,4)) -;
            THIS.buf2dword(SUBSTR(lpRect, 5,4))
    
    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)
    
    PROCEDURE declare
        DECLARE INTEGER GetSystemMetrics IN user32;
            INTEGER nIndex
    
        DECLARE INTEGER DeleteObject IN gdi32;
            INTEGER hObject
    
        DECLARE INTEGER GetFocus IN user32
    
        DECLARE SetWindowRgn IN user32;
            INTEGER hWindow, INTEGER hRgn, SHORT bRedraw
    
        DECLARE SHORT GetWindowRect IN user32;
            INTEGER hWindow, STRING @lpRect
    
        DECLARE INTEGER CreateRectRgn IN gdi32;
            INTEGER nLeftRect, INTEGER nTopRect,;
            INTEGER nRightRect, INTEGER nBottomRect
    
        DECLARE INTEGER CombineRgn IN gdi32; 
            INTEGER hrgnDest, INTEGER hrgnSrc1,;
            INTEGER hrgnSrc2,;
            INTEGER fnCombineMode
    
    ENDDEFINE
    

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    2151 bytes  
    Created: 2001-08-28 12:00:00  
    Modified: 2011-01-19 18:36:52  
    Visits in 7 days: 182  
    Listed functions:
    CombineRgn
    CreateRectRgn
    DeleteObject
    GetFocus
    GetSystemMetrics
    GetWindowRect
    SetWindowRgn
    Printer friendly API declarations
    My comment:
    Visual FoxPro 8.0 Samples: Creating Irregularly Shaped Windows Sample.
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