Using Win32 functions in Visual FoxPro Image Gallery
Keyboard Input
..msdn
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)
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
Drawing standard Windows icons

User rating: 8.5/10 (2 votes)
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More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
Before you begin:

See also:
  • Displaying the associated icons and descriptions for files and folders
  • How to view icons stored in executable files
  • Drawing Windows frame controls
  • Drawing Windows predefined bitmaps
  •  
    PUBLIC frm
    frm = CREATEOBJECT("Tform")
    frm.Visible = .T.
    * end of main
     
    DEFINE CLASS Tform As Form
    * Icon Ids
    #DEFINE IDI_APPLICATION  32512
    #DEFINE IDI_ASTERISK  32516
    #DEFINE IDI_ERROR  32513
    #DEFINE IDI_EXCLAMATION  32515
    #DEFINE IDI_HAND  IDI_ERROR
    #DEFINE IDI_INFORMATION  IDI_ASTERISK
    #DEFINE IDI_QUESTION  32514
    #DEFINE IDI_WARNING  IDI_EXCLAMATION
    #DEFINE IDI_WINLOGO  32517
     
        Width=400
        Height=130
        AutoCenter = .T.
        Caption = " Drawing standard Windows Icons"
     
        ADD OBJECT cmd As CommandButton WITH;
            Caption="Draw", Width=80, Height=27
     
    PROCEDURE Init
        THIS.declare
        THIS.Resize
     
    PROCEDURE Resize
        WITH THIS.cmd
            .Left = Int((ThisForm.Width - .Width)/2)
            .Top = THIS.Height - .Height - 20
        ENDWITH
        ThisForm.DrawIcons
     
    PROCEDURE DrawIcons
        THIS._draw(IDI_APPLICATION, 20,20)
        THIS._draw(IDI_HAND, 60,20)
        THIS._draw(IDI_QUESTION, 100,20)
        THIS._draw(IDI_EXCLAMATION, 140,20)
        THIS._draw(IDI_ASTERISK, 180,20)
        THIS._draw(IDI_WINLOGO, 220,20)
        THIS._draw(IDI_WARNING, 260,20)
        THIS._draw(IDI_ERROR, 300,20)
        THIS._draw(IDI_INFORMATION, 340,20)
     
    PROTECTED PROCEDURE _draw(lnIconId, X,Y)
        LOCAL hWindow, hdc, hicon
        hWindow = THIS.HWnd && GetFocus() for older VFP versions
     
        hdc = GetDC(hWindow)
     
        hicon = LoadIcon(0, lnIconId)
        IF hicon <> 0
            = DrawIcon(hdc, X,Y, hicon)
        ENDIF
        = ReleaseDC(hWindow, hdc)
     
    PROCEDURE declare
        DECLARE INTEGER GetFocus IN user32
        DECLARE INTEGER GetDC IN user32 INTEGER hWindow
     
        DECLARE INTEGER LoadIcon IN user32;
            INTEGER hInstance, INTEGER lpIconName
     
        DECLARE SHORT DrawIcon IN user32;
            INTEGER hDC, INTEGER X, INTEGER Y, INTEGER hIcon
     
        DECLARE INTEGER ReleaseDC IN user32;
            INTEGER hWindow, INTEGER hdc 
     
    PROCEDURE Paint
        ThisForm.DrawIcons
     
    PROCEDURE Moved
        ThisForm.DrawIcons
     
    PROCEDURE cmd.Click
        ThisForm.DrawIcons
     
    ENDDEFINE
     

    User rating: 8.5/10 (2 votes)
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    • ~
    1864 bytes  
    Created: 2001-08-21 12:00:00  
    Modified: 2009-01-21 23:37:41  
    Visits in 7 days: 85  
    Listed functions:
    DrawIcon
    GetDC
    GetFocus
    LoadIcon
    ReleaseDC
    Printer friendly API declarations
    My comment:
    Since the icons are displayed not via native VFP controls, the Resize, Paint and Moved methods of the form need to be instructed to redraw the icons. Otherwise the icons would be wiped out when, for example, the form after having been partially moved beyond the main VFP window then is moved within.
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