I've been looking for this info in the conduit forums, but stumbled across it here. It sounds like I've been doing it correctly: offsetting by 8 bytes and reading and appending the remainder of the records to a file on the host. However, while I get a file that is about the right size for a jpeg, looks like a jpeg and smells like a jpeg, the graphics viewer, e.g. Paintshop Pro, says it is not a valid jpeg file. I'm reading the DBLK formatted ****.jpg files from internal memory of a Cli� (NZ90) and storing them on the PC. I will need this to also work on a Zire. Are jpegs special in some way? Don't tell me it's another Sony proprietary thing, I'll jump - I swear...
Thks, Randyp > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:bounce-palm- > [EMAIL PROTECTED] On Behalf Of Ben Combee > Sent: Wednesday, July 02, 2003 3:30 PM > To: Palm Developer Forum > Subject: Re: Reading a file stream via conduit... > > At 09:30 AM 7/2/2003, Arrow wrote: > >i'm using CW + POL to write a streaming file in a Palm app, > >using the POL CFile class (which calls FileOpen,FileWrite,etc) > >...the Palm app just reads packets from a serial connection > >and just needs to save the data as one big block...henced > >why i used streaming file... > > Sounds like a good use for them. > > >...for my conduit, using CDK 4.03, i can read in > >this block. i use the CHHMgr class -> palmRec(CPalmRecord) > >which reads this block. I noticed though, that the > >data pointer ( via palmRec.GetRawData() ) points 8 bytes > >before the actual data, the first 4 bytes make up "DBLK" > >(what does "DBLK" represent?) and then the next 4 bytes make up > >the size the data...no problem to get the data by moving the > >pointer 8 bytes ahead ( i just need to parse it and save to a flat > file), > >but does this sound correct ? ...wondering if anyone else has done > similar. > > 'DBLK' is a header that Palm OS uses to verify that the database is > indeed > a filestream. Your interpretation sounds correct, and also matches > that > used by the libprc library (part of the program par) that can read and > write filestream PDB files. > > >i read the drawback of using streaming file is that i cannot > >backup the pdb to PC, is this correct ? > > File streams are not backed up by the backup conduit, but you can > manually > back them up in your conduit. > > > -- > For information on using the Palm Developer Forums, or to unsubscribe, > please see http://www.palmos.com/dev/support/forums/ -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
