Nobody can help me? I´vre read the companion many times, but tried to
find how the AddressBook manages it, but I´m stuck.
Must I set the point usin TblSetItemPtr or the implementing the
function set bt TblSetLoadDataProcedure is enough?
On Thu, 03 Feb 2005 12:10:38 -0200, AyloNs Hazzud <[EMAIL PROTECTED]> wrote:
> On Thu, 03 Feb 2005 00:03:58 -0600, Logan Shaw <[EMAIL PROTECTED]>
> wrote:
>
> > AyloNs Hazzud wrote:
> >> Err PrvMedindoPegaItem(void *tableP, Int16 row, Int16 column, Boolean
> >> editable,
> >> MemHandle *dataH, Int16 *dataOffset, Int16
> >> *dataSize,
> >> FieldPtr fld){
> >> FieldAttrType attr;
> >> Char * dataP;
> >> AnPiRecordPtr recordP;
> >> MemHandle recordH, fldH;
> >>
> >> /*Aproveita que a função lida field a field e os configura*/
> >> FldGetAttributes(fld, &attr);
> >> attr.justification = rightAlign;
> >> attr.numeric = true;
> >> attr.singleLine = true;
> >> FldSetAttributes(fld, &attr);
> >>
> >>
> >> FldSetMaxChars(fld, 6);
> >> *dataSize = FldGetMaxChars(fld) + 1;
> >> *dataOffset = 0;
> >>
> >> /*Retorna 1 se houver erro na alocação da memória*/
> >> if (!(fldH = MemHandleNew(*dataSize)))
> >> return 1;
> >>
> >> recordH = DmQueryRecord(AnPiDB, CurrentRecord);
> >> ErrFatalDisplayIf(DmGetLastRecord(), "Record não encontrado");
> >>
> >> recordP = MemHandleLock(recordH);
> >>
> >> dataP = (Char *) MemHandleLock(fldH);
> >>
> >> /*record->estado diz a medida atual*/
> >> FlpFToText(recordP->P[recordP->estado][row][column], dataP,
> >> *dataSize - 1);
> >>
> >> MemHandleUnlock(fldH);
> >> MemHandleUnlock(recordH);
> >>
> >> *dataH = fldH;
> >>
> >> return 0;
> >>
> >> }
> >
> > Since you're getting read errors from 0x000000 and 0x000002 and
> > since you have two pointers of type (Int16 *), it seems suspicious
> > that maybe one of them is NULL. Have you tried validating
> > all the arguments at the beginning of the function, like this:
> >
> > if (! tableP || ! dataH || ! dataOffset || ! dataSize || ! fld)
> > {
> > FrmCustomAlert (MyAlert, "NULL pointer passed", "", "");
> > return 1;
> > }
> >
> > Also, it looks like you are storing a pointer (the "P" member
> > of the AnPiRecord) in a database. That can be a bad idea.
> > Are you sure that after you read recordP that the pointer
> > recordP->P actually points anywhere?
>
> You must be talking about this piece of code:
>
> FlpFToText(recordP->P[recordP->estado][row][column], dataP,
> >> *dataSize - 1);
>
> This function reads the P member and write it´s value (FlpCompDouble) in a
> especially formated text in dataP, which is a pointer to a locked
> MemHandle, Then, I assign this memhandle to the *data parameter.
>
> >
> > Beyond that, my best advice is to step through this function
> > in the debugger to establish exactly *which* line of code is
> > accessing memory at 0x000000. That should at least tell you
> > which pointer is invalid. (If you don't want to use the
> > debugger, put a bunch of FrmCustomAlert()s in and then you
> > have to click "OK" over and over again, and one time after
> > you click "OK", the system will print its error message
> > about invalid access to 0x000000. Then you know it's after
> > the FrmCustomAlert() you just clicked "OK" for.)
> >
> > - Logan
> >
>
> I´ve already tried to debug in search of an pointer to Ox000000 being set
> in my function, but I cannot find it. Actually, this functions always run
> seamless, bothh anallowed access occurs when I´m adding text to the field,
> more precisely in the ExpandFieldHeight function.
>
> Here is a screenshot of my debugging section when exiting the function. I
> really cannot realize what I´m doing wrong.
>
> http://img226.exs.cx/img226/3047/screenshot0411go.jpg
>
> All data is read and saved OK. In fact, in a actual device, It runs OK.
> The item style is narrowTextTableItem, and I have set its int field with
> TblSetItemInt.
>
> Must I have to set any other fields before drawing the table? I want to
> left the pixels on the right blank, must I implement the drawprocedure or
> I can left it just as it is?
>
> --
> AyloNs Hazzud, com N invertido
>
> Sempre usando Opera e seu fantástico programa de email, o M2. Comparação
> do zoom do Opera com o do Firefox:
> http://www.aylons.kit.net/2004/11/isso-sim-que-zoom.html
>
> --
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