Download Circuit Cellar January 2011 by Steve Ciarcia Founder Editor PDF

By Steve Ciarcia Founder Editor

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This starting time information is required to calculate how much time is left in the current hour. Obtaining the local time is simple in Window’s Mobile. Passing a pointer to a SYSTEMTIME structure to the function GetLocalTime() allows the mobile device’s operating system (OS) to populate the structure with the current time and date (see Listing 2, Lines 116–118). The wHour member will contain the number of hours elapsed since the beginning of the day (24-hour time format). Likewise, wMinute specifies the number of minutes since the beginning of the hour.

I have to make sure to stop the timers once recording stops (a second key-press event, as you can see in Listing 4, Lines 220–242). To accomplish this, I call KillTimer() twice, once for each timer, inside the WM_KEYDOWN message handler (see Listing 4, Lines 222 and 223). I also call KillTimer() inside the WM_DESTROY message handler to stop the timer if the window closes in the middle of recording (see Listing 1, Lines 42–44). If the timers have already been stopped, then calling KillTimer() again won’t cause problems.

The function needs to define the size and location of the graph within the window (see Listing 9). To accomplish this, I use another RECT structure, which I call graphSize. The graphSize structure is filled using the WHERE TO NEXT? windowSize structure. Using such a simple snore recogI apply some padding around the nizer DSP algorithm based on a sigedges of the graph to leave room for nal RMS value to determine whether whitespace and labels. The beauty of basing the graph size Listing 8—My PaintGraphData() paints the graph’s data line to the application’s window.

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