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:
An alternative way of setting Form.Closable to False
Animating a transition of the VFP form (a wire-frame rectangle)
Attaching menu to a top-level form
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Creating a clipping region from the path selected into the device context of a form
Disabling drawing in the VFP form
Displaying animated images on FoxPro form with BitBlt and StretchBlt functions
Dragging files from Explorer window and dropping them on FoxPro control (requires VFP9)
Drawing a window caption using the DrawCaption routine
Drawing standard Windows icons
Form Magnifier
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)
GDI+: sending image of FoxPro form to printer
GetFocus returns a HWND value
How to block the ALT+TAB shortcut (WinXP)
How to block the PrintScreen key
How to copy the image of a form to the Clipboard using Bitmap API functions
How to create transparent areas inside a form -- punching holes in the form
How to drag a Form not using its Titlebar or Caption
How to intercept window messages sent to VFP form
How to print FoxPro form
How to print FoxPro form -- II
How to put a horizontal text scrolling on the form (a news line, marquee)
How to put a vertical text scrolling on the form (a movie cast)
How to start the screen saver and how to find whether the screen saver is active
How to view icons stored in executable files (Icon Viewer)
Placing a button on the VFP form as a new child window
Retrieving top-child window for the VFP form
Retrieving window and menu help context identifiers
Round FoxPro form
Running a regular FoxPro form while main VFP window is minimized
Setting the mouse capture to the specified window
Setting the Window Region for a form
Shortcut Menu Class
Storing screen shot of a form to bitmap file
Storing screen shot of a form to enhanced metafile (*.emf)
The window and its ancestors
Tracking mouse movement to detect when to start dragging
Using Common Controls: the Header Control
Using FrameRgn for displaying system colors
Using IsChild() for testing ThisForm.ShowWindow property
Using FrameRgn for displaying system colors

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#DEFINE sqTop       120
#DEFINE sqLeft       30
#DEFINE sqHeight     64
#DEFINE sqWidth      64
#DEFINE stroke       32
#DEFINE sqInterval   10
#DEFINE dsHeight    600
#DEFINE dsWidth     600

DO decl

    X = sqLeft
    Y = sqTop
    lnColorIndex = 0

    DO WHILE .T.
        IF Not _display (lnColorIndex, X,Y, sqWidth,sqHeight)
            EXIT
        ENDIF

        lnColorIndex = lnColorIndex + 1
        X = X + sqWidth + sqInterval

        IF X > dsWidth
            X = sqLeft
            Y = Y + sqHeight + sqInterval
        ENDIF
    ENDDO

FUNCTION  _display (lnColorIndex, X,Y, width, height)
* draw a frame using system color

    LOCAL hwnd, hDc, hBrush, hRgn
    hBrush = GetSysColorBrush (lnColorIndex)

    IF hBrush <> 0
        hwnd = GetFocus()
        hDc = GetWindowDC(hwnd)
        hRgn = CreateRectRgn (X, Y, X+width, Y+height) 

        * draw a bold frame
        = FrameRgn (hDc, hRgn, hBrush, stroke, stroke)

        * set text color
        = SetTextColor (hDC, Rgb (128,128,128))

        * print color index value
        lcColorIndex = STR(lnColorIndex, 3) + " "
        = TextOut (hDc, X+4,Y+4,;
            lcColorIndex, Len(lcColorIndex))

        * draw a thin frame with system color 1
        hBrush = GetSysColorBrush (1)
        = FrameRgn (hDc, hRgn, hBrush, 1, 1)

        = DeleteObject (hRgn)
        = ReleaseDC (hwnd, hdc)
        RETURN .T.
    ENDIF
RETURN .F.

PROCEDURE  decl
    DECLARE INTEGER GetFocus IN user32 
    DECLARE INTEGER GetWindowDC IN user32 INTEGER hwnd  
    DECLARE INTEGER ReleaseDC IN user32;
        INTEGER hwnd, INTEGER hdc 
    DECLARE INTEGER DeleteObject IN gdi32 INTEGER hObject  

    DECLARE INTEGER GetSysColorBrush IN user32 INTEGER nIndex

    DECLARE INTEGER CreateRectRgn IN gdi32; 
        INTEGER nLeftRect, INTEGER nTopRect,; 
        INTEGER nRightRect,INTEGER nBottomRect 

    DECLARE SHORT FrameRgn IN gdi32;
        INTEGER hdc,;
        INTEGER hrgn, INTEGER hbr,;
        INTEGER nWidth, INTEGER nHeight

    DECLARE INTEGER TextOut IN gdi32;
        INTEGER hdc,;
        INTEGER x, INTEGER y,;
        STRING  lpString, INTEGER nCount

    DECLARE INTEGER SetTextColor IN gdi32;
        INTEGER hdc, INTEGER crColor


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2030 bytes  
Created: 2001-08-27 12:00:00  
Modified: 2002-11-07 19:22:51  
Visits in 7 days: 260  
Listed functions:
CreateRectRgn
DeleteObject
FrameRgn
GetFocus
GetSysColorBrush
GetWindowDC
ReleaseDC
SetTextColor
TextOut
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