Thanks for that. I did not see any info on WHICH creator ID to use
in the documentation. I inserted the generic 'STRT' for the sake of
example, but I did not have 'psys' in my actual code. I switched my
code to use 'psys' and that seems to work on my TX that I use for
testing.
I still haven't quite figured out the DmGetRecord DmReleaseRecord
thing yet. I thought I was on the right track because it was
working in Simulator 5.4. Yesterday I tried it on my TX and it was
a crash fest. Here is the code in the original daVinci API:
extern Err GetRecord(DmOpenRef db, UInt16 recordNum, void *item)
{
void *src;
void *recordH;
//Get the record from the database
recordH = DmQueryRecord(db, recordNum);
src = MemHandleLock(recordH);
if (src == NULL) return dmErrIndexOutOfRange;
//Unpack the record
UnpackRecord(db, item, src);
MemHandleUnlock(recordH);
return 0;
}
I changed it to:
extern Err GetRecord(DmOpenRef db, UInt16 recordNum, void *item)
{
void *src;
void *recordH;
UInt32 value = 0;
Err error = errNone;
UInt8 highest;
UInt32 count;
UInt32 busy;
//these lines were added
error = FtrGet('psys',sysFtrNumDmAutoBackup, &value);
if (error == 0)
{
error = DmSyncDatabase(db);
if (error != errNone)
ErrAlert(error);
}
else if (error == ftrErrNoSuchFeature)
gBigBadError = error;
//Get the record from the database
//recordH = DmQueryRecord(db, recordNum);// - this line was replaced by the
following
recordH = DmGetRecord(db, recordNum);
src = MemHandleLock(recordH);
if (src == NULL) return dmErrIndexOutOfRange;
//Unpack the record
UnpackRecord(db, item, src);
MemHandleUnlock(recordH);
DmGetDatabaseLockState (db, &highest, &count, &busy);
if (busy > 0)
{
DmReleaseRecord(db, recordNum, true);
error = DmSyncDatabase(db);
}
return 0;
}
I noticed that calling DmReleaseRecord when a record is not busy causes the TX
to crash (reset) hence the DmGetDatabaseLockState call. Am I on the right
track? Why does MemHandleUnlock seem to clear the busy count?
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