I am writing a small programme, which is using functions from DateBK.c
(Release: Palm OS SDK 5.0).
According to this example, one of the first steps to edit a record is
to unpack the record.
Well this works fine. Following this I am able to do everything I want
to do, for example editing the description or the note field.
//My Testfile
ApptUnpack(ptorecord, &unpacked);
descr=unpacked.description;
WinDrawChars(descr, StrLen(descr),0,100);
descr=unpacked.note;
WinDrawChars(descr, StrLen(descr),0,120);
But if I need to read a lot descriptions and notes from many records
this would take a lot of time (I am using a PalmIII ;-) ).
So I found the following typedef in DateDB.c.
// The following structure doesn't really exist. The first field
// varies depending on the data present. However, it is convient
// (and less error prone) to use when accessing the other information.
typedef struct {
ApptDateTimeType when;
ApptDBRecordFlags flags; // A flag set for each datum
present
char firstField;
UInt8 reserved;
} ApptPackedDBRecordType;
typedef ApptPackedDBRecordType * ApptPackedDBRecordPtr;
I tried to understand how the data is written in such a packed record
and I also made a lot of tests with the Debugger. But I wasn't able to
understand what is "firstField" and how to get data out of it.
Is it possible to get the whole information of the description and the
note field out of a packed record?
How?
Thanks a lot for your answer!
Oliver
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