Using Win32 functions in Visual FoxPro Image Gallery
Device Context
..msdn
ChangeDisplaySettings
CreateCompatibleDC
CreateDC
DeleteDC
DeleteObject
EnumDisplayDevices
EnumDisplaySettings
GetDC
GetDeviceCaps
GetObject
GetObjectType
ReleaseDC
SelectObject
Code examples:
Bitmap Class for Visual FoxPro application
Converting twips to pixels and vice versa
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
Creating a window using CreateWindowEx function
Displaying animated images on FoxPro form with BitBlt and StretchBlt functions
Displaying bitmap using the AlphaBlend function
Displaying the associated icons and descriptions for files and folders
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 standard Windows icons
Drawing Windows frame controls using the DrawFrameControl function
Drawing Windows predefined bitmaps using the LoadBitmap functions
Form Magnifier
GDI+ fun: roach-infested desktop
GDI+: Color Transparency
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
GDI+: Creating thumbnails to preview images in a directory
GDI+: custom control, base class
GDI+: how to make VFP controls visually shake and shudder
GDI+: Implementing image scrolling with inertia
GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)
GDI+: Scrolling through large image using the mouse
GDI+: sending image of FoxPro form to printer
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 picture stored in enhanced-format metafile (*.emf)
How to find which fonts Windows uses for drawing captions, menus and message boxes
How to make a VFP form fading out when released (GDI version)
How to make a VFP form fading out when released (GDI+ version)
How to play AVI file on the _screen
How to print a bitmap file
How to print FoxPro form
How to print FoxPro form -- II
How to print picture stored in enhanced-format metafile (*.emf)
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 view icons stored in executable files (Icon Viewer)
How to view icons stored in executable files (Icon Viewer) - II
Obtaining the bounding rectangle for the specified device context
Placing an arbitrary rectangular area of main VFP window on the Clipboard
Placing On-screen Alert on top of all windows
Printing text on the client area of the main VFP window
Printing text on the main VFP window
Printing text with the Escape function
Reading metrics for the currently selected font
Retrieving graphic capabilities of your display
Splash Screen for the VFP application
Storing content of the Clipboard to a bitmap file
Storing screen shot of a form to bitmap file
Storing screen shot of a form to enhanced metafile (*.emf)
Subclassing CommandButton control to create BackColor property
Using Font and Text functions
Using FrameRgn for displaying system colors
Using GetNearestColor
Using the DrawText function
Using the GradientFill function
Using the LoadImage function to have a bitmap file loaded and displayed on VFP main window
Vertical Label control
Using the DrawText function

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More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
DO decl
#DEFINE TRANSPARENT  1
#DEFINE OPAQUE       2

#DEFINE DT_LEFT      0
#DEFINE DT_CENTER    1
#DEFINE DT_TOP       0
#DEFINE DT_RIGHT     2
#DEFINE DT_WORDBREAK 16

    LOCAL hWindow, hDC, lcRect, lcText
    hWindow = GetActiveWindow()
    hDC = GetWindowDC(hWindow)

    _screen.BackColor = Rgb(238,238,255)

    lcText = "The DrawText function draws formatted text " +;
        "in the specified rectangle. It formats the text " +;
        "according to the specified method (expanding tabs, " +;
        "justifying characters, breaking lines, and so forth)."

    * left, top, right, bottom
    lcRect = n2dw(100) + n2dw(100) + n2dw(300) + n2dw(260)
    = DrawText (hDC, lcText, Len(lcText),;
        @lcRect, DT_WORDBREAK+DT_RIGHT)

    * changing background mode and color
    = SetBkMode (hDC, TRANSPARENT)

    = SetTextColor (hDC, Rgb(216,216,248))
    lcRect = n2dw(105) + n2dw(303) + n2dw(405) + n2dw(603)
    = DrawText (hDC, lcText, Len(lcText), @lcRect, DT_WORDBREAK)

    = SetTextColor (hDC, Rgb(0,80,192))
    lcRect = n2dw(100) + n2dw(300) + n2dw(400) + n2dw(600)
    = DrawText (hDC, lcText, Len(lcText), @lcRect, DT_WORDBREAK)

    = ReleaseDC(hWindow, hDC)

PROCEDURE decl
    DECLARE INTEGER GetActiveWindow IN user32
    DECLARE INTEGER GetWindowDC IN user32 INTEGER hWnd
    DECLARE INTEGER ReleaseDC IN user32 INTEGER hWnd, INTEGER hDC
    DECLARE INTEGER SetBkMode IN gdi32 INTEGER hdc, INTEGER iBkMode
    DECLARE INTEGER SetTextColor IN gdi32 INTEGER hdc, INTEGER crColor

    DECLARE INTEGER DrawText IN user32;
        INTEGER hDC, STRING lpString, INTEGER nCount,;
        STRING @lpRect, INTEGER uFormat

FUNCTION  n2dw (lnValue)
#DEFINE m0       256
#DEFINE m1     65536
#DEFINE m2  16777216
    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)


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1867 bytes  
Created: 2002-04-20 14:52:48  
Modified: 2002-04-20 14:53:00  
Visits in 7 days: 38  
Listed functions:
DrawText
GetActiveWindow
GetWindowDC
ReleaseDC
SetBkMode
SetTextColor
Printer friendly API declarations
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User Contributed Notes:
"Malcolm Greene" <news2news@bdurham.com> | 2005-03-21 09:27:55
Does anyone have any tips to share on how to configure DrawText() to work with a specific font? My problem lies in calculating font height for the CreateFont() call. I'm not getting accurate heights returned by DrawText() for many True Type fonts at various font sizes.

Heres what I have so far:

Assuming pcFontName, pnFontSize (in points), and boolean lbBold, lbItalic, lbUnderline, and lbStrikeThru variables contain font specific info.

* determine font height
* NOTE: - MulDiv( pnFontSize, GetDeviceCaps( hDC, LOGPIXELSY ), 72 )
local lnFontHeight
lnFontHeight = - int( pnFontSize * GetDeviceCaps( hDC, LOGPIXELSY ) / 72 )

* create a new font to use for our text calculations
local hFont
hFont = CreateFont( ;
lnFontHeight, 0, 0, 0, lnBold, lbItalic, lbUnderLine, lbStrikeThru, ;
ANSI_CHARSET,OUT_OUTLINE_PRECIS, CLIP_STROKE_PRECIS, PROOF_QUALITY, DEFAULT_PITCH, pcFontName )

* select new font into the device context and delete the old one
= DeleteObject( SelectObject( hdc, hFont ) )

My goals are to use DrawText() to:

a. Determine the max amount of vertical space required to display a word wrapped string in order to create an autosizing editbox

b. Use DrawText() with the DT_MODIFYSTRING parm to get back trimmed strings with elllipsis (...) when I need to display more text than will fit in a specific rectangle. I can get this to work with single line strings - but not with strings that wrap and/or have carriage returns.

Any ideas appreciated!

Malcolm

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