At 0:00 Uhr -0800 13.03.2000, Greg Winton wrote:
>Hello Marc,
>
>At 08:08 PM 3/8/00 +0100, you wrote:
>>Who has experiences with databases in shared-libraries? I try to
> >generate a new database from a shared-library and to write records to
>>it, but it simple does not work.
>
>I have implemented a shared library that reads and writes from a database
>with no problem. I know of no reason why reading/writing databases from a
>shared library should be any different than from an application. Perhaps
>you could post a snippet of code for the implementation of SaveData and
>ReadData?
>
>Regards,
>Greg
Greg, thanks for the reply. Currently I want to generate database
entries that are references by a unique "prefSelector", for example
when I pass a prefSelector of 10, the following data contains the
username for FTP access. Currently I just try to generate a new
record in my database (which is successfully generated and opened
through Prv_OpenDatabase). To make a new record and write some data I
tried the following, but afther this the info dialog of the launcher
application just indicates 0 records for my library's database.
What's wrong with my code?
Err SetPref(UInt refNum, DWord clientContext, UInt prefSelector,
VoidPtr prefContent)
{
ICSP_ClientContextPtr contextP;
DmOpenRef ICSP_DB; // our database pointer
Err error;
UInt recordIndex = dmMaxRecordIndex; // always add new entrys at the
// end of the database
VoidHand recordH;
ICSP_PrefsStructPtr nilP=0;
Char zero=0;
ULong length = 0;
// Validate our parameters
if ( prefSelector < ICSP_FirstSelector || prefSelector >
ICSP_LastSelector)
return ICSP_ErrInvalidSelector;
// Make sure the library has been opened
if ( !PrvIsLibOpen(refNum) )
return( ICSP_ErrNotOpen );
ICSP_DB = Prv_OpenDatabase();
length = sizeof ( prefSelector ) +
StrLen ( (CharPtr)
prefContent ) + 1; // add 1 for string terminator
recordH = DmNewRecord( ICSP_DB, &recordIndex, length );
if( recordH )
{
VoidPtr pDBRec = MemHandleLock( recordH );
DmWrite( pDBRec, 0, prefContent, length );
MemHandleUnlock( recordH );
DmReleaseRecord( ICSP_DB, recordIndex, true );
}
error = DmResetRecordStates(ICSP_DB);
if (error)
ErrFatalDisplay("failed resetting ICSP_Lib record state");
error = DmCloseDatabase(ICSP_DB);
if (error)
ErrFatalDisplay("failed cloasing ICSP_Lib database");
ICSP_DB = 0;
return( 0 );
}
--
Marc Mennigmann werkbank multimedia gmbh
PGP-Key RSA ID 0x12026CB9 [EMAIL PROTECTED]
PGP-Key DSS ID 0xB79F9DB0 http://www.werkbank.com
--
For information on using the Palm Developer Forums, or to unsubscribe, please see
http://www.palm.com/devzone/mailinglists.html
