Programming for Multiple Monitors in Windows 98
Figure 3: Cache the Work Area

Continued from Figure 2: The Virtual Desktop

This code snippet caches the work area of every monitor for later use.

// global variables to store work area

int gCount;

LPRECT gpRectArray = NULL;

void CacheWorkAreas()

{

// set the counter to 0

gCount = 0;

// delete old array, since number of monitors may

// have changed

delete [] gpRectArray;

// allocate a new array sized to the number of monitors

gpRectArray = new RECT[GetSystemMetrics(SM_CMONITORS)];

EnumDisplayMonitors(NULL, NULL, monitorEnumInfoProc, 0);

}

// definition of callback function

BOOL CALLBACK monitorEnumProc(

HMONITORhmonitor,

HDChdcMonitor,

LPRClprcMonitor,

DWORDdwData)

{

MONITORINFO mi;

mi.cbSize = sizeof(mi)

GetMonitorInfo(hmonitor, &mi);

*gpRectArray[gCount] = mi.rcWork;

gCount++;

}

Published as Power Programming in the 4/7/98 issue of PC Magazine.