Scratch that, reverse it. I get chunk overlocked errors. That is because i
am never unlocking it, so it gets overselected.
Andrew Lathrop <[EMAIL PROTECTED]> wrote in message
news:22338@palm-dev-forum...
>
> If you don't mind my asking, did you get around it? If so, how? I tried
> not unlocking the record, and that would give me chunk underlocked errors
if
> the record was selected multiple times. Thanks for the suggestions,
> Andrew
> <[EMAIL PROTECTED]> wrote in message news:22290@palm-dev-forum...
> >
> > I had the NULL handle problem with redrawing my table cells before. I'm
> > using my own custom table drawing callback to draw my cells.
> > The way I get data for the cell is to use recH=DmGetRecord(xxx, index),
> > and after I'm done drawing, I did a MemHandleFree(recH).
> > Which is wrong and BAD. Because the next time I try to access that same
> > record index, there is no MemHandle to it, and I'm trying to draw data
> > from it.
> > MemHandles can be multiple locked, and the only way for a
> > DmQueryRecord() to return a NULL handle is if DmQueryRecord() doesn't
> > have anything to return (like a record that has already been freed?). So
> > says the documentation.
> >
> > Hope this helps, chances are, I haven't given you all possible
> > explanations. I've only been doing this for a couple of months.
> >
> >
> > Andrew Lathrop wrote:
> > >
> > > I have a table in my app. The way i am using the table, once the user
> > > selects a table item, they then have to click a button to edit the
> record,
> > > delete it, etc. The table and buttons work fine. But, if the user
> double
> > > clicks the table selection, (selects it twice without clicking
anything
> > > else) two things happen. 1) For any record besides the first, the
cell
> is
> > > redrawn with some new value. 2) I get an error about MemoryMgr.c
> causing a
> > > NULL handle error.
> > > The only reason i can come up with for the NULL handle error is that
the
> > > handle is locked, and then locked again without being unlocked.
> > > I have the following two lines of code where the error appears to come
> from.
> > > I have a breakpoint set at precord =, and can see that hrecord has a
> value,
> > > except when it is double clicked. Then the value is 0x00000000, which
> > > causes the error since it then tries to lock the memory at that
> location,
> > > and none exists. Is there anyway around this?
> > > hrecord = DmQueryRecord( sonomaDB, record );
> > > precord = MemHandleLock( hrecord );
> > >
> > > Thanks,
> > > Andrew
> >
> >
>
>
>
>
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