Here is an odd behavior I cannot seem to track down...
I have a app that uses the old serial manager code, "back door" methods to
do event-based reads of the serial port:
if (sirRefNum == sysInvalidRefNum) {
err = SysLibFind ("Serial Library", &sirRefNum);
if (err) return;
err = SerOpen (sirRefNum, 0, 9600);
if (err && (err != serErrAlreadyOpen)) {
sirRefNum = sysInvalidRefNum;
return;
}
// We're going to use a Wakeup Handler
// instead of polling for input
SerSetWakeupHandler(sirRefNum, SIRWake, 0);
SerPrimeWakeupHandler(sirRefNum, 1);
}
Now for the weird part... When this code runs, the Palm device (several that
I've tested including Palm IIIc/ 3.5os, pdQPhone/3.0x, VII/3.2) there is a
soft "tick" sound (ie, SndPlaySystemSound(sndClick)) played *every time* the
code above is executed. Commenting out the SerSet/SerPrime calls gets rid of
the sound, but also renders the program non-functional.
Where is that sound comming from, and how do I get rid of it?
- John Schettino
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