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
Retrieving graphic capabilities of your display

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More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
#DEFINE DRIVERVERSION      0
#DEFINE TECHNOLOGY         2
#DEFINE HORZSIZE           4
#DEFINE VERTSIZE           6
#DEFINE HORZRES            8
#DEFINE VERTRES           10
#DEFINE LOGPIXELSX        88
#DEFINE LOGPIXELSY        90 
#DEFINE BITSPIXEL         12
#DEFINE PLANES            14
#DEFINE NUMBRUSHES        16
#DEFINE NUMPENS           18
#DEFINE NUMFONTS          22
#DEFINE NUMCOLORS         24
#DEFINE ASPECTX           40
#DEFINE ASPECTY           42
#DEFINE ASPECTXY          44
#DEFINE CLIPCAPS          36
#DEFINE SIZEPALETTE      104
#DEFINE NUMRESERVED      106
#DEFINE COLORRES         108
#DEFINE PHYSICALWIDTH    110
#DEFINE PHYSICALHEIGHT   111
#DEFINE PHYSICALOFFSETX  112
#DEFINE PHYSICALOFFSETY  113
#DEFINE SCALINGFACTORX   114
#DEFINE SCALINGFACTORY   115
#DEFINE RASTERCAPS        38
#DEFINE CURVECAPS         28
#DEFINE LINECAPS          30
#DEFINE POLYGONALCAPS     32
#DEFINE TEXTCAPS          34

DO decl

    LOCAL hdc
    hdc = GetDC(0)  && entire screen

    CREATE CURSOR csResult (name C(30), prm N(12))

    = AddLog("Driver version", GetDeviceCaps(hdc, DRIVERVERSION))
    = AddLog("Device technology", GetDeviceCaps(hdc, TECHNOLOGY))
    = AddLog("Physical screen, width, mm", GetDeviceCaps(hdc, HORZSIZE))
    = AddLog("Physical screen, height, mm", GetDeviceCaps(hdc, VERTSIZE))
    = AddLog("Screen, width, pixels", GetDeviceCaps(hdc, HORZRES))
    = AddLog("Screen, height, pixels", GetDeviceCaps(hdc, VERTRES))
    = AddLog("Pixels per inch, X", GetDeviceCaps(hdc, LOGPIXELSX))
    = AddLog("Pixels per inch, Y", GetDeviceCaps(hdc, LOGPIXELSY))
    = AddLog("Bits per pixel", GetDeviceCaps(hdc, BITSPIXEL))
    = AddLog("Color planes", GetDeviceCaps(hdc, PLANES))
    = AddLog("Device-spec. brushes", GetDeviceCaps(hdc, NUMBRUSHES))
    = AddLog("Device-spec. pens", GetDeviceCaps(hdc, NUMPENS))
    = AddLog("Device-spec. fonts", GetDeviceCaps(hdc, NUMFONTS))
    = AddLog("Colors in table", GetDeviceCaps(hdc, NUMCOLORS))
    = AddLog("Pixel relative width", GetDeviceCaps(hdc, ASPECTX))
    = AddLog("Pixel relative height", GetDeviceCaps(hdc, ASPECTY))
    = AddLog("Pixel relative diagonal", GetDeviceCaps(hdc, ASPECTXY))
    = AddLog("Clipping capab.", GetDeviceCaps(hdc, CLIPCAPS))
    = AddLog("Entries in sys.palette", GetDeviceCaps(hdc, SIZEPALETTE))
    = AddLog("Res.entries in sys.palette", GetDeviceCaps(hdc, NUMRESERVED))
    = AddLog("Actual color resolution", GetDeviceCaps(hdc, COLORRES))
    = AddLog("Physical page width", GetDeviceCaps(hdc, PHYSICALWIDTH))
    = AddLog("Physical page height", GetDeviceCaps(hdc, PHYSICALHEIGHT))
    = AddLog("Physical offset X", GetDeviceCaps(hdc, PHYSICALOFFSETX))
    = AddLog("Physical offset Y", GetDeviceCaps(hdc, PHYSICALOFFSETY))
    = AddLog("Printer scaling factor X", GetDeviceCaps(hdc, SCALINGFACTORX))
    = AddLog("Printer scaling factor Y", GetDeviceCaps(hdc, SCALINGFACTORY))
    = AddLog("Raster caps", GetDeviceCaps(hdc, RASTERCAPS))
    = AddLog("Curve caps", GetDeviceCaps(hdc, CURVECAPS))
    = AddLog("Line caps", GetDeviceCaps(hdc, LINECAPS))
    = AddLog("Polygon caps", GetDeviceCaps(hdc, POLYGONALCAPS))
    = AddLog("Text caps", GetDeviceCaps(hdc, TEXTCAPS))

    = ReleaseDC(0, hdc)

    GO TOP
    BROWSE NORMAL NOWAIT

PROCEDURE AddLog(lcName, lnPrm)
    INSERT INTO csResult VALUES(m.lcName, m.lnPrm)

PROCEDURE decl
    DECLARE INTEGER GetDC IN user32 INTEGER hwnd
    DECLARE INTEGER ReleaseDC IN user32 INTEGER hwnd, INTEGER hdc
    DECLARE INTEGER GetDeviceCaps IN gdi32 INTEGER hdc, INTEGER nIndex



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3498 bytes  
Created: 2001-11-06 18:58:50  
Modified: 2011-12-10 09:20:22  
Visits in 7 days: 42  
Listed functions:
GetDC
GetDeviceCaps
ReleaseDC
Printer friendly API declarations
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