[firebird-support] Error using a transaction parameter block with the OO API.

[markjf...@comcast.net [firebird-support]]

I'm using the Firebird 3.0 release version.  Delphi 10.1 Berlin with the 
firebird.pas release file and fbclient3.  I can connect to the database and can 
run queries, but I can't seem to get a custom transaction parameter block to 
work.   Here's my code:

    // Transaction := attachment.startTransaction(status, 0, nil);
    tpb := Util.getXpbBuilder(status, IXpbBuilder.TPB, nil, 0);
    tpb.insertTag(status, isc_tpb_write);
    tpb.insertTag(status, isc_tpb_read_committed);
    tpb.insertTag(status, isc_tpb_nowait);
    tpb.insertTag(status, isc_tpb_rec_version);
    
    // This always seems to error with "invalid format for transaction 
parameter block"
    Transaction := attachment.startTransaction(status, 
tpb.getBufferLength(status), tpb.getBuffer(status));

Has anyone gotten that to work?  Any suggestions are appreciated.  Also, does 
anyone know what the default transaction parameters are (e.g. if no custom tpb 
is used)?  Thanks for any help.

-Mark Ford