Re: DmResizeRecord on T3 device

Michael A. Waldron Wed, 29 Oct 2003 07:33:36 -0800

I've seen the same error when running the old built in app databases through the exchange manager (both reading and writing) but it's fairly hard to duplicate. Once your device does it though, it happens almost every time. I'm 100% sure it's a problem with Palm's database "shadowing" system and as of yet I have found no way around it.

I've seen the problem on a T3 and a TE.

-Mike

At 10:06 PM 10/28/2003 -0500, you wrote:

Hi David,

I am the one who posted on this subject on October 18th that Lance is
refereing to.
No one from PalmOne ever responded to this one.  Like stated, I "fixed" my
issue by changing not to use the resize.

There error does happen on the close of the database, and it is one of the
PIM databases.  I was just creating a Memo.

Below is what I originally posted.  Perhaps someone from PalmOne can answer
why it is no longer any good.

Thanks,

Scott
---------------------------------------------------------------------------
I have a piece of code that copies some text to a buffer, then makes a memo
from the buffer.

This has worked in my product on every OS 5 device except the T3.  On the
T3, I get the following  error when calling
DmCloseDatabase(memoDB);

DataMgr.c, Line:7399, DmWrite: DmWriteCheck failed

Notice that it says DmWrite is writing this fatal alert.  This is happening
when I call DmCloseDatabase.  Looking at the DataMgr.c source, I cannot see
where DmCloseDatabase even calls DmWrite.  Anyhow does anyone see anything
wrong with the code I have below that would cause the above to happen only
on the T3(and T3 simulator), and it happens when DmCloseDatabase is called.

Thanks,

Scott

               DmOpenRef memoDB;
                MemHandle hNew;
                char *writebuf;
                UInt16 numbytes;
                UInt16 RecNum;
                Char *theMemo;
                Err err;
                UInt32 tlong;
                DateTimeType td;
                #define MemoBufsize 1024
                Char buf[40];

                memoDB = DmOpenDatabaseByTypeCreator( 'DATA', 'memo',
dmModeReadWrite);
                if (!memoDB) {
                  break;
                }
                writebuf = (char *) MemPtrNew(MemoBufsize);
                if (!writebuf) {
                  FrmAlert(NoMemAlert);
                  DmCloseDatabase(memoDB);
                  break;
                }

                numbytes = 0;
                // copy some stuff to the writebuf

                hNew = DmNewRecord(memoDB, &RecNum, MemoBufsize);
                if (!hNew) {
                  FrmAlert(NoMemAlert);
                  DmCloseDatabase(memoDB);
                  break;
                }

                theMemo = MemHandleLock(hNew);
               DmStrCopy(theMemo, 0, writebuf);
                err = MemHandleResize(hNew, numbytes);
                MemHandleUnlock(hNew);

                DmReleaseRecord(memoDB, RecNum, true);
                err = DmCloseDatabase(memoDB);
                MemPtrFree(writebuf);
              }
              break;

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--- Michael A. Waldron, AE0MW http://www.mikew.org PGP: http://www.mikew.org/mypgpkey.txt


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Re: DmResizeRecord on T3 device

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