> MemPtr RecP;
> MemHandle RecH
> RecP = MemHandleLock(RecH);
> // attempt to get pointer to beginning of strings.
> RecP += (sizeof(MyRecType) + 1);
> I also tried casting the pointer to a char* like:
> RecP = (char*) MemHandleLock(RecH);
This last line is wrong (in conjunction with the declaration) - the
location
of this last cast says "whatever is returned by MemHandleLock(), cast as
a
char *", but you're then immediately assigning it to a void * (RecP). I
usually just declare my record pointer as type Char * and then cast it
as
that from MemHandleLock(), i.e.:
...
Char *RecP; // note the type
RecP = (Char *) MemHandleLock( ... );
// liberal utilization of string functions with no casts
...
I do this because I subsequently use a lot of Str...() functions, all of
which need
a Char *, not a void *, and this way leads to a lot fewer casts. I'm
also using
C++, which is stricter about the types. To get at strings you want to
use a
Char *.
-----Original Message-----
From: Jim Duffy [mailto:[EMAIL PROTECTED]]
Sent: Monday, April 02, 2001 11:58 AM
To: Palm Developer Forum
Subject: Re: Packed Record HELP PLEASE
Thanx for this help Fox,
Could you add to the reading part a bit though?
For example, What kind of pointer should I be using to get to the
strings.
I need to first get past my struct which is at the beginning of the
record
to get to my strings.
I tried:
MemPtr RecP;
MemHandle RecH
RecP = MemHandleLock(RecH);
// attempt to get pointer to beginning of strings.
RecP += (sizeof(MyRecType) + 1);
I also tried casting the pointer to a char* like:
RecP = (char*) MemHandleLock(RecH);
But this gives me an "illegal type" error.
Any suggestions?
Thanx a bunch..
Jim
"Ingo Claro Fox" <[EMAIL PROTECTED]> wrote in message
news:44394@palm-dev-forum...
>
> you must use DmStrCopy to write the text to the databse to pack the
contents.
> Then when you read the record and have a pointer to it you do:
> recP+=StrLen(recP)+1
> to catch the next string.
>
>
> DmWrite(RecPtr,StructSize,prefs.String1,String1Len);
> > DmWrite(RecPtr,(StructSize +
String1Len),prefs.String2,String2Len);
> > DmWrite(RecPtr,(StructSize + String1Len +
> >String2Len),prefs.String3,String3Len);
> > MemHandleUnlock(NewRecordH);
> > DmReleaseRecord(DBRef,Location,true);
>
> Ingo Claro Fox
> [EMAIL PROTECTED]
>
>
>
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