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Detect Multiple Monitors

By Sergey - Posted on January 1st, 2008
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The GetSystemMetrics WIN API can be used to get the number of monitors. Some other constants related to multi-monitor PC configurations are also included.

This is sample code. Add error handling and adjust to your requirements as necessary.

#DEFINE SM_XVIRTUALSCREEN 76
#DEFINE SM_YVIRTUALSCREEN 77
#DEFINE SM_CXVIRTUALSCREEN 78
#DEFINE SM_CYVIRTUALSCREEN 79
#DEFINE SM_CMONITORS 80
DECLARE INTEGER GetSystemMetrics IN user32 INTEGER nIndex
lnNonitors = GetSystemMetrics(SM_CMONITORS)
? lnNonitors