> first, the obvious stuff:
> - where does it crash?
I have a form that contains a list control. It crashes when that form
opens, after displaying the list and after it shows the record count
popup. The only other thing the form does is call:
GetImportNames(). GetImportNames() has been commented out to do
nothing except what is shown below. The exact text is shown below.
> - how many iterations thru the loop before it crashes?
Have not determined that yet.
> - what exactly are you doing in the "Do something here" part?
Nothing! I have only left a place to do something. The only code in
that function is shown below. If I comment out everything in the
'for' loop, it does not crash (fatal error).
> - are you sure ImportDB is really pointing at the memopad database?
I use:
void OpenImportDB(void) {
curIdx = 0;
ImportDB = DmOpenDatabaseByTypeCreator(DBTYPE2,
CREATORID2, dmModeReadWrite);
if (!ImportDB)
{
FrmCustomAlert(altNotice, "MemoDB not found!", "Create with
MemoPad", "Thanks");
}
}
to get ImportDB.
> - did you verify under the debugger that DmNumRecords really returned 535,
> or could there be an error in your popup debugging code?
I did load the MemoDB right after hot-syncing, into POSE and ran the
application. It showed a different larger number of records. Wierd.
Anyway, it might be easier just to show me how to do the following as
simply as possible.
Open the MemoDB
Read the first 6 characters from the first 10 records into an
array.
that's it! That is what I was trying to do. I have the
OpenDatabase() function and the GetImportNames() to read the first 6
chars, of the first 10 records, into an array. All of _that_ code
has been commented out to isolate the problem. The code that I have
shown is all the code envolved in this attempt.
Since, this code causes a fatal error, there must be something wrong.
BTW, I have also tried DmQueryNextInCategory() just in case there
was something wrong with DmQueryRecord.
This is odd!
> now, something interesting:
> i've seen databases that have somehow become corrupted, where the
> specific effect of the corruption is that the database claims to have many
> many many more records than it actually has. trying to install the
> database onto POSE yields a "database corrupt" error. however, the
> database for the most part seems to work (and if i tweak POSE to load the
> database anyway, it basically works, too). your symptoms sound identical
> to this problem. everyone for whom i've seen this kind of corruption
> happen has been using MacPac v2. (i've seen it happen to 7 different
> users, one of whom claims every time he does a HotSync it corrupts his
> database, even if he is starting fresh from a hard reset).
>
>
>
> ----- Original Message -----
> From: Mike Davis <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, August 23, 1999 6:14 PM
> Subject: Re: Reading/Writing MemoPad DBs ???
>
>
> > more info on problem #1 -- DmNumRecords will tell you total records
> > including deleted records. DmNumRecordsInCategory will tell you how
> > many live records there are (to get all live records, specify
> > dmAllCategories).
>
> First, I sync several times a day. Shouldn't that get rid of any
> deleted records? I find it hard to believe that I can have almost
> 400 deleted records since I hardly ever use MemoPad.
>
> Second, when I execute this code within the 'for' statement, the
> system gives me a fatal error and resets. If I comment out the:
> RecHandle = DmQueryRecord(ImportDB, i);
> RecPointer = MemHandleLock(RecHandle);
> // Do something here
> // to access specific data
> MemPtrUnlock(RecPointer);
> lines, it does not crash. So it has something to do with this.
> Now, since I suspect that the numRec is higher than it should be,
> maybe that is causing access to areas that do not exist.
>
> But why does it not return the correct number of records? Like
> I say, I hardly ever use MemoPad and hot-sync daily.
>
> Any other ideas? BTW, the code below is exactly what I execute after
> opening the DB. There are no other routines associated with this DB. I
> open it then execute GetImportNames, as written.
>
> Mike
>
>
> > ----- Original Message -----
> > From: S�rgio Carvalho <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Monday, August 23, 1999 4:09 PM
> > Subject: Re: Reading/Writing MemoPad DBs ???
> >
> >
> > > Hi,
> > >
> > > Problem 1: Make sure you're not getting confused by deleted records.
> > > Deleted records stay in the DB until the next sincronization, so the
> > > total record count, and the 'live' record count may be different.
> > >
> > > Problem 2: If you try to write to the record, in the Do Something here
> > > section, you must use DmSet. Other than that, I guess your code is
> > > correct.
> > >
> > > Problem 3: Yes. A Memopad record is only a null terminated string.
> > > I've successfully read from it, with no problems. The pointer obtained
> > > by the record handle lock points to the first char. The best source of
> > > info about the MemPad database is the application source code
> > > (headers, mainly).
> > >
> > > Sergio
> > >
> > > Mike Davis wrote:
> > >
> > > > I am having a problem understanding how to read and write
> > > > a MemoPad record.
> > > >
> > > > I have looked at MemoPad application but is not really helping
> > > > me on this. I have three problems (probably more).
> > > >
> > > > Problem 1: I have placed a Custom Alert to tell me how many
> > > > records are in the DB. The popup reports 535 records. But
> > > > there are only 144 records. I have verified the real number of
> > > > records by the count in MemoPad and by looking at the DB with
> > > > RsrcEdit app. Both show 144 records. Why the discrepancy?
> > > >
> > > > Problem 2: I get a fatal error when I use this code. I have
> > > > removed everything down to the bare minimum that causes the
> > > > crash. The problem is with what is inside the 'for' block. I
> > > > use this code to access another of my own DBs. What is wrong
> > > > with this code? Why does it crash?
> > > >
> > > > Problem 3: I have looked at the MemoDB with RsrcEdit and it is just
> > > > a null terminated string for each record. Doesn't RecPointer point
> > > > to the first char of the MemoPad data? If not, what is the format
> > > > of the record pointed to by RecPointer?
> > > >
> > > > Where is the best source of documentation on a MemoPad record?
> > > > A simple app would help.
> > > >
> > > > Thanks
> > > >
> > > > void GetImportNames(void) {
> > > > VoidHand RecHandle;
> > > > Ptr RecPointer;
> > > > int i, numRecs;
> > > > char buffer[10];
> > > >
> > > > numRecs = DmNumRecords(ImportDB);
> > > > StrIToA(buffer, numRecs);
> > > > FrmCustomAlert(altNotice, buffer, "", "");
> > > >
> > > > for(i=0; i<numRecs; i++) { // get names
> > > > RecHandle = DmQueryRecord(ImportDB, i);
> > > > RecPointer = MemHandleLock(RecHandle);
> > > > // Do something here
> > > > // to access specific data
> > > > MemPtrUnlock(RecPointer);
> > > > }
> > > > }
> > > > --
> > > > -----------------------------------------------------------------
> > > > Discussion Group: http://www.halcyon.com/ipscone/wwwboard/
> > > >
> > > > Protect your constitutional rights. Your favorite one may be next!
> > > > -----------------------------------------------------------------
> > >
> > > --
> > > Sergio Carvalho
> > > ---------------
> > > [EMAIL PROTECTED]
> > >
> > >
> > >
> >
> >
>
>
> --
> -----------------------------------------------------------------
> Discussion Group: http://www.halcyon.com/ipscone/wwwboard/
>
> Protect your constitutional rights. Your favorite one may be next!
> -----------------------------------------------------------------
>
>
>
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