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
GDI+: sending image of FoxPro form to printer

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Before you begin:
The code is based on custom GDI+ class. Download the class module first and save it in gdiplus.prg file.

Call this code from a method or event of a FoxPro form when that form is active, i.e. posesses the keyboard focus.

See also:

Download ScreenCapture Library

  • How to print FoxPro form
  • How to print FoxPro form -- II (using metafile)
  • Storing screen shot of a form to a BMP file
  • Storing clipboard contents to a BMP file
  • SET PROCEDURE TO gdiplus ADDITIVE
    #DEFINE SRCCOPY  0x00CC0020
    DO decl
    
    * an instance of gdiplusinit should be created before
    * and released after using any of gdi+ objects
    PRIVATE gdiplus
    gdiplus = CREATEOBJECT("gdiplusinit")
    
    LOCAL hwindow, hdc, bmp, nWidth, nHeight
    hwindow = GetFocus()
    hdc = GetWindowDC(hwindow)
    STORE 0 TO nWidth, nHeight
    = GetWinRect(hwindow, @nWidth, @nHeight)
    
    bmp = CREATEOBJECT("gdibitmap", m.nWidth, m.nHeight)
    WITH bmp
        .graphics.GetDC
        = BitBlt(.graphics.hdc, 0,0, .imgwidth, .imgheight,;
            m.hdc, 0,0, SRCCOPY)
        .graphics.ReleaseDC
    ENDWITH
    
    LOCAL hPrnDC, gdip, docinfo
    hPrnDC = GetPrnDC()
    gdip = CREATEOBJECT("graphics", hPrnDC)
    
    docinfo = PADR(CHR(20), 20, CHR(0))
    = StartDoc(m.hPrnDC, m.docinfo)
    = StartPage(m.hPrnDC)
    WITH gdip
        * note that the actual printing is scaled
        .DrawImage(bmp, 20,20,;
            bmp.imgwidth/2, bmp.imgheight/2)
    
    *    .DrawImage(bmp, 20,20)
    ENDWITH
    = EndPage(m.hPrnDC)
    = EndDoc(m.hPrnDC)
    = DeleteDC(m.hPrnDC)
    = ReleaseDC(m.hwindow, m.hdc)
    * end of main
    
    PROCEDURE GetWinRect(hwindow, nWidth, nHeight)
    #DEFINE maxDword  0xffffffff
        LOCAL lpRect, nLeft, nTop, nRight, nBottom
        lpRect = REPLI (Chr(0), 16)
        = GetWindowRect (hwindow, @lpRect)
        nRight  = buf2dword(SUBSTR(lpRect, 9,4))
        nBottom = buf2dword(SUBSTR(lpRect, 13,4))
    
        nLeft = buf2dword(SUBSTR(lpRect, 1,4))
        IF nLeft > nRight
            nLeft = nLeft - maxDword
        ENDIF
        nTop = buf2dword(SUBSTR(lpRect, 5,4))
        IF nTop > nBottom
            nTop = nTop - maxDword
        ENDIF
        nWidth = nRight - nLeft
        nHeight = nBottom - nTop
    RETURN
    
    FUNCTION GetPrnDC
    * returns device context of default printer
    #DEFINE PD_RETURNDC      0x100
    #DEFINE PD_RETURNDEFAULT 0x400
        LOCAL lcStruct, lnFlags
        lnFlags = PD_RETURNDEFAULT + PD_RETURNDC
    
        lcStruct = num2dword(66) + Repli(Chr(0), 16) +;
            num2dword(lnFlags) + Repli(Chr(0), 42)
        IF PrintDlg(@lcStruct) <> 0
            RETURN buf2dword (SUBSTR(lcStruct, 17,4))
        ENDIF
    RETURN 0
    
    PROCEDURE decl
        DECLARE INTEGER GetFocus IN user32
        DECLARE INTEGER GetWindowDC IN user32 INTEGER hwindow
        DECLARE INTEGER ReleaseDC IN user32 INTEGER hwindow, INTEGER hdc
        DECLARE INTEGER GetWindowRect IN user32 INTEGER hwnd, STRING @lpRect 
        DECLARE INTEGER DeleteDC IN gdi32 INTEGER hdc
        DECLARE INTEGER PrintDlg IN comdlg32 STRING @ lppd
        DECLARE INTEGER StartPage IN gdi32 INTEGER hdc
        DECLARE INTEGER EndPage IN gdi32 INTEGER hdc
        DECLARE INTEGER EndDoc IN gdi32 INTEGER hdc
        DECLARE INTEGER StartDoc IN gdi32 INTEGER hdc, STRING lpdi
    
        DECLARE INTEGER BitBlt IN gdi32;
            INTEGER hDestDC, INTEGER x, INTEGER y,;
            INTEGER nWidth, INTEGER nHeight, INTEGER hSrcDC,;
            INTEGER xSrc, INTEGER ySrc, INTEGER dwRop
    
    
    

    User rating: 10/10 (1 votes)
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    2696 bytes  
    Created: 2004-07-13 10:11:10  
    Modified: 2011-03-28 09:41:52  
    Visits in 7 days: 39  
    Listed functions:
    BitBlt
    DeleteDC
    EndDoc
    EndPage
    GetFocus
    GetWindowDC
    GetWindowRect
    PrintDlg
    ReleaseDC
    StartDoc
    StartPage
    Printer friendly API declarations
    My comment:

    #kwd: sln_gdiplus, sln_printform
    Word Index links for this example:
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    User Contributed Notes:
    65.13.0.61 | 2006-08-19 11:49:49
    Anatoliy,

    I am creating a thematic map of the United States. It consists of a container object on a form. The container object contains shape objects in the form of each state in the U.S.

    I would like to save the image of the map to a .BMP, .JPG or .PNG without making the form visible. How do I do this?

    Dan
    danrhymes@bellsouth.net | 2006-08-19 11:50:11
    Anatoliy,

    I am creating a thematic map of the United States. It consists of a container object on a form. The container object contains shape objects in the form of each state in the U.S.

    I would like to save the image of the map to a .BMP, .JPG or .PNG without making the form visible. How do I do this?

    Dan
    Hugh Winters | 2006-08-30 12:55:10
    I am having trouble finding the gdiplus.prg you refer to in your code setup. Please tell me exactly where I might find this program. I have looked everywhere.

    Perhaps this program was outmoded by the new GDIPlusX.vcx class library and is no longer available. If so, please adjust your code to work with it.

    Thanks!

    Hugh Winters
    A.M. | 2006-08-30 19:34:07
    Hugh,

    There's a link to this code in Before You Begin section on this page

    http://www.news2news.com/vfp/?example=450

    This GDI+ library is not freeware though. It is also not compatible with GDI+ FFC code, since I have decided to create this library from scratch.

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