Hi again,
Thanks, Scott-- though I think I messed up in my code
listing-- I didn't mean to imply that where:
listString = aValue[n];
that aValue[] was a character array-- I meant to say
that when going through the loop, aValue is one of 4
possible strings... that is, as my remark noted, a
each a different line from a string list resource...
So if I understand where you were going with checking
the length of the string to popluate the record, the
difference is that each field would hold a distinct
string.
So to repeat my code with edits, with hope you, or
someone else could comment in this regard (thanks =)
)...
typedef struct {
Char Header1;
Char Header2;
Char Header3;
Char Header4;
} HeaderType;
...
static void FirstFunction(){
Char listString;
MemPtr strBuffer[4];
for (n=0; n<=3; n++) {
strBuffer[n] = MemPtrNew(80);
listString =
SysStringByIndex(headStringListRes[position], n,
strBuffer[n], 80);
HeadWrite(n, listString);
}
MemPtrFree(strBuffer[0]);
MemPtrFree(strBuffer[1]);
MemPtrFree(strBuffer[2]);
MemPtrFree(strBuffer[3]);
}
static Err HeadWrite(Int8 fieldIndex, Char
*recordString ) {
HeaderType *RecordP;
MemHandle RecordH;
Err error;
RecordH = DmGetRecord(MyDB, 0);
if (!RecordH) error=DmGetLastErr();
else {
RecordP = (HeaderType *) MemHandleLock(RecordH);
switch (fieldIndex) {
case 0:
error = DmStrCopy(RecordP,
OffsetOf(HeaderType, Header1), recordString);
break;
case 1:
... //same as above, for Header2
break;
... //and so on, through case 3/Header4
//for the record, instead of this switch/case
//method of iterating through the fields, I also
tried
//to use DmStrCopy(RecordP, fieldIndex,
recordString); to
//same results
}
MemHandleUnlock(RecordH);
DmReleaseRecord(fortuneDB, 0, true);
}
MemPtrFree(index);
return error;
}
--- In [EMAIL PROTECTED], "Grosch, Scott"
<[EMAIL PROTECTED]> wrote:
> > Kind of a newbie question, I guess: I'm trying to
> > write four strings into a record with four fields.
>
> Your example is confusing as you say you're writing
a string,
> yet your header is 4 characters.
>
> If you're really writing strings (multiple
characters) to the
> database, then you need to do the DmGetRecord and
then loop
> over the length. For example, if you want to write
the third
> string:
>
> Char *str, *record;
> UInt16 offset;
>
> h = DmGetRecord(db, idx);
> record = (Char *)MemHandleLock(h);
>
> // Find how long the first string is. Add one so
you skip over
> // the \0 which ends the string.
> offset = StrLen(record) + 1;
>
> // Now move that far forward in the record
> record += offset;
>
> // Find how long the second string is.
> offset += StrLen(record) + 1;
>
> // Move over it as well
> record += offset;
>
> // len is now the offset into the record of where to
write the
> // third string
> DmStrCopy(record, offset, "your new value");
>
>
>
> Note that I'm not checking out of bounds conditions
here, and I've
> now corrupted the following records. You basically
need to loop
> over it the first time and copy out the strings
(MemPtrNew()) into
> temp variables, then rewrite it entirely with all 4.
You will
> likely have to resize your record as well. If that
doesn't make
> sense mail back.
>
> --
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