Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
GDI+: Storing content of the Clipboard to a bitmap file
How to change display settings: screen resolution, screen refresh rate
GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)
Custom GDI+ class
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
How to convert a bitmap file to monochrome format (1 bpp)
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Capturing keyboard activity of another application with the Raw Input API (VFP9)
GDI+: Implementing image scrolling with inertia
Retrieving the name of the primary domain controller (PDC) and join status information
Storing content of the Clipboard to a bitmap file
Custom HttpRequest class (WinHTTP)
How to detect if additional monitor is connected and active
The SQLGetProp() creates a bridge between Visual FoxPro and the ODBC API
Winsock: sending email messages (SMTP, port 25)
How to display Windows On-Screen Keyboard
Custom HttpRequest class (WinINet)
How to activate Windows Calculator
How to put a horizontal text scrolling on the form (a news line, marquee)
How to create MD-5 and SHA-1 hash values from a string
How to change the name and the size of the font in the MessageBox dialog
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Mapping and disconnecting network drives
How to change display settings: screen resolution, screen refresh rate

User rating: 10/10 (2 votes)
Rate this code sample:
  • ~
More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
Versions:
click to open
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
  •  
      Members area. Log in to view this example.
     
      User name:
      Password:
     
     
      Forgot your password?
     
      Sign up for
    the Membership
     
      Buy this example for $10.00
    Instant email delivery.

    Read more...
     


    User rating: 10/10 (2 votes)
    Rate this code sample:
    • ~
    6320 bytes  
    Created: 2003-01-21 10:56:03  
    Modified: 2013-09-20 13:29:51  
    Visits in 7 days: 421  
    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.
  • Word Index links for this example:
    Translate this page:
      Spanish    Portuguese    German    French    Italian  
    FreeTranslation.com offers instant, free translations of text or web pages.
    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.

    Copyright 2001-2014 News2News, Inc. Before reproducing or distributing any data from this site please ask for an approval from its owner. Unless otherwise specified, this page is for your personal and non-commercial use. The information on this page is presented AS IS, meaning that you may use it at your own risk. Microsoft Visual FoxPro and Windows are trade marks of Microsoft Corp. All other trademarks are the property of their respective owners. 

    Privacy policy
    Credits: PHP (4.4.9), an HTML-embedded scripting language, MySQL (5.1.68), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
    Last Topics Visited (50.17.79.35)
    6 sec.Function: 'NetServerGetInfo'
    Function group: 'Network Management'
    9 sec.
    Function group: 'Shell Lightweight Utility APIs -- misc. functions'
    20 sec.Function: 'GetWindowLong'
    Function group: 'Window Class'
    26 sec.Function: 'UpdateResource'
    35 sec.Example: 'Printing Image File, programmatically set print page orientation to landscape'
    55 sec.Function: 'GetForegroundWindow'
    Function group: 'Window'
    Google
    Advertise here!