I can't use offsetof() in my application. My StructType is defined as
typedef struct {
UInt32 Id1;
UInt32 Id2;
char Data[1];
} StructType;
I can use offsetof(StructType, Id1) to write to the first field, but how can I
update data in the 5th field (also have to consider there is also data in the
sixth field and new data might have a different size)?
-Elizabeth
|--------+----------------------->
| | rishib@lisco.|
| | com |
| | |
| | 10/02/00 |
| | 04:47 PM |
| | Please |
| | respond to |
| | palm-dev-foru|
| | m |
| | |
|--------+----------------------->
>-----------------------------------------------------------|
| |
| To: [EMAIL PROTECTED] |
| cc: |
| Subject: Re: How to update a specified field in |
| the database |
>-----------------------------------------------------------|
From: <[EMAIL PROTECTED]>
Subject: How to update a specified field in the database
> Can someone give me some direction on updated a specific field in the
database
> for a giving field position, data to be written to the record, and the
record
> handle? I already know how to write data to the database record by
record, but
> I sometimes need to update just some specified field(s) in the record.
Thanks.
>From Neil Rhodes' book (available online at
http://www.palmos.com/dev/tech/docs/devguide/ch06.htm#P218_13516):
VoidHand myRecord = DmGetRecord(gDB, recordNumber);
StructType *s = MemHandleLock(myRecord);
DmWrite(s, offsetof(StructType, field), &newValue, sizeof(newValue));
MemHandleUnlock(myRecord);
DmReleaseRecord(gDB, recordNumber, true);
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