How to detect if additional monitor is connected and active -- Visual FoxPro : Using Win32 (WinAPI) Functions


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How to detect if additional monitor is connected and active

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Before you begin:

Nowadays having two monitors connected to a PC becomes more a common place rather than exception. This code sample explains how to detect all available monitors through enumerating display devices and their properties.

How to adjust monitor brightness (Vista, monitor with DDC support)


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4378 bytes
Created: 2008-12-09 14:50:37
Modified: 2010-12-22 20:36:24
Visits in 7 days: 138

Listed functions:

EnumDisplayDevices
EnumDisplaySettings
GetMonitorInfo
MonitorFromWindow

My comment:

In the cursor created by this code sample, each connected monitor is indicated by non-empty MonitorName value.

For an active monitor (the desktop extends to such monitor), several other values are populated:

Screenwidth

Screenheight

Bitsperpixel

DsppositionX

DsppositionY

From the screen dimensions and the display position it is possible to determine whether a given window is visible on a particular display.

* * *
Read Two monitors are better than one by Tony Northrup published on Microsoft website. Bet he might be busy writing a sequel "N+1 monitors better than N".

* * *
Some graphics cards and external units (Matrox) support connections to three and more monitors.

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