On 5/26/05 4:50 PM, Arshad Tayyeb didst favor us with:
>
> I have an application that needs to find any mounted CDs and get
> their TOCs.
> It pretty much works under Panther, but in Tiger I get the following
> problem:
>
> When calling FSGetVolumeInfo and iterating over the volumes, the
> first time I call it, it works fine. It returns me the volRef
> numbers -100, -101 (for the 2 drives I always have mounted), and -112
> (for example) for the currently mounted CD.
>
> Then I eject the CD, and load a different CD, and run that code again
> (during the same run of the program).
>
> The I get -100, -101, and -112 *again*! And -112 is no longer a
> valid ref number.
I have code that iterates over the volumes using FSGetVolumeInfo and I'm not
seeing this. Even if I insert a CD I just ejected, it mounts with the next
vRefNum. How are you ejecting these disks? Are you doing it programmatically
and not unmounting them?
Larry
>
> If I quit the program and re-launch it correctly identifies -113 as
> the new CD's volume reference.
>
> This problem is not limited to CDs - it also occurs when mounting/
> dismounting iPods, for example.
>
> My guess is that once I call FSGetVolumeInfo, it caches the volumes
> for the lifespan of the current process.
>
> Is this a bug in Tiger? And can anyone think of any way around it?
> Is there any way to flush the File Manager's cache of volume
> information?
>
> Thanks,
> -Arshad
>
> Here's the code I'm using (approximately):
>
>
> while (1) /* bug occurs when the code runs more than once
> during the process' lifetime */
> {
> char x[1024];
> gets(x); /* this makes it prompt me, if I hit enter it will
> re-scan for volumes */
> findalltocs();
> printf("Reading....\n");
> result = noErr;
>
>
> short ref = GetDefaultAudioCDRefNum();
> printf("ref : %d\n", ref);
>
> for (volumeIndex = 1; result == noErr || result != nsvErr;
> volumeIndex++)
> {
> FSVolumeRefNum actualVolume;
> HFSUniStr255 volumeName;
> FSVolumeInfo volumeInfo;
>
> bzero((void *) &volumeInfo, sizeof(volumeInfo));
>
> result = FSGetVolumeInfo(kFSInvalidVolumeRefNum,
> volumeIndex,
> &actualVolume,
> kFSVolInfoFSInfo,
> &volumeInfo,
> &volumeName,
> NULL);
>
> printf("Vol %d %d\n", volumeIndex, actualVolume); /*
> actual volume is the volume ref */
> ...
> }
> }
>
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