[open-beos-printing] =?iso-8859-1?Q?Re: Undocumented transport add-ons init=5Ftransport() =behavior!??=

>
>Hi, it's me again!
>
>Last night I try to hunt down the 
>"PDF Writer crash on filepanel cancellation" bug.
>
>A print_server transport add-on should export two functions:
>- BDataIO * init_transport(BMessage * msg);
>- void exit_transport(void);
>
>BeOS R5.0.x built-in "Print To File" transport add-on don't return 
>a NULL BDataIO * if you cancel the filepanel. 
>But I doesn't seem to be a valid BDataIO * even, because 
>a BDataIO::Write() on it crash it immediatly! 
>In PDF Writer case, it crash in same place, at first PDFWriter::WriteData() 
>call.
>
>Built-in BeOS R5.0.x print drivers seem to know something we don't 
>(yet?!) here, because they don't crash nor they seem to start print job *
>rendition* when user cancel the filepanel. But they make a difference 
>with a NULL BDataIO * returned value, as they all show a error alert box
>in this case.
>
>I've print out the msg after being pass to init_transport, 
>but the add-on don't modify it.
>Same thing for job file attributs...
>
>So, currently I'm lost :-(

Hmm, I don't know if this is the official way, but I have found a possibility
to work around that problem (see repository).

http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/open-beos/print_kit/source/add
-ons/drivers/PDF/source/PrinterDriver.cpp

- Michael

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