Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Extensible Storage Engine class library
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Custom GDI+ class
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Converting Unicode data from the Clipboard to a character string using a given code page
GDI+: Implementing image scrolling with inertia
Using Month Calendar Control (VFP9, Comctl32.dll)
Monitoring clipboard content changes (VFP9)
Winsock: sending email messages (SMTP, port 25)
Enumerating data formats currently available on the clipboard
Browsing Windows Known Folders (Special Folders)
Displaying icons in the system tray (VFP9)
How to find which fonts Windows uses for drawing captions, menus and message boxes
Windows Shell Icons displayed and exported to ICO files (Vista)
Custom FTP Class for Visual FoxPro application
How to draw custom Window Caption on FoxPro form
Writing entries to custom Event Log
Customizing the frame of top-level form: removing the standard frame (VFP9, Vista)
Detecting changes in connections to removable drives (VFP9)
Displaying dimmed window behind VFP top-level form
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
How to change display settings: screen resolution, screen refresh rate

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Before you begin:
This code sample shows how to switch the monitor resolution to 800x600 pixels and back, keeping the existing refresh rate.

Before changing the resolution the code verifies if the hardware supports the requested graphics mode.



See also:
  • How to adjust monitor brightness (Vista, monitor with DDC support)
  • How to detect if additional monitor is connected and active
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    User rating: 10/10 (2 votes)
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    6320 bytes  
    Created: 2003-01-21 10:56:03  
    Modified: 2016-02-25 09:23:01  
    Visits in 7 days: 69  
    Listed functions:
    ChangeDisplaySettings
    EnumDisplayDevices
    EnumDisplaySettings
    GetDesktopWindow
    GetMonitorInfo
    MonitorFromWindow
    Printer friendly API declarations
    My comment:
    A screenshot of C# version of this code sample.


    * * *
    Five ways of obtaining current monitor resolution:

  • The SYSMETRIC(1 | 2) is the simplest one. Very likely it is a wrapper around either GetSystemMetrics (SM_CXFULLSCREEN | SM_CYFULLSCREEN) call or SystemParametersInfo call. Each of three reports data for the primary monitor only.

  • Presented in the code sample above, the EnumDisplaySettings populates the DEVMODE structure. Members dmPelsWidth and dmPelsHeight of this structure contain the width and the height for enumerated monitor.

  • The GetMonitorInfo populates the MONITORINFO structure. The rcMonitor member in this structure is the RECT structure itself. It contains the display monitor rectangle expressed in virtual-screen coordinates.

  • The GetWindowPlacement populates a rectangle -- RECT rcNormalPosition. Call this function with the handle to the desktop window. For multiple monitor configuration, such desktop rectanlge is a combination of all active monitor rectangles.

  • Normally the mouse cursor is confined inside the desktop window. The GetClipCursor copies the desktop window dimensions into the RECT structure.
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    User Contributed Notes:
    Rosemar | 2006-12-08 11:49:22
    I have 2 computers.

    One of then, with Windows XP and another one, with Windows 98.

    In the machine with Windows XP this code works right, but, in another computer with Windows 98, when I run the code, the desktop area lost the original icons positions and the Windows Task Bar became HIDED outside the desktop area.

    This problem have solution ?

    Thank's.
    A.M. | 2006-12-11 20:09:50
    You may try to refresh the Desktop window by calling an API function like ShowWindow, MoveWindow, SetWindowPos, SetForegroundWindow, SwitchToThisWindow.

    Win98 -- this is an old system. Some API calls are not supported or behave in a different way.

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