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From: carolyn@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Better Printer Output
Message-ID: <2665@cbmvax.UUCP>
Date: Fri, 30-Oct-87 10:20:43 EST
Article-I.D.: cbmvax.2665
Posted: Fri Oct 30 10:20:43 1987
Date-Received: Sun, 1-Nov-87 09:12:35 EST
References: <186@iconsys.UUCP>
Reply-To: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS)
Organization: Commodore Technology, West Chester, PA
Lines: 71
Keywords: printer driver code device

In article <186@iconsys.UUCP> danny@iconsys.UUCP (Danny Young) writes:
>I would like to be able to look at the information in the 
>PrinterExtendedData portion of the current Preference-chosen
>printer driver.
>
>My question is: Is there a way I can get to this data (through
>several levels of indirection) from the pointer returned to me
>by an OpenDevice("printer.device") command? 
        
-------------------------------------------------------------------------

  Fragment of code for accessing printertag and printer prefs.

...
 #include exec/ports.h 
 #include exec/io.h
 #include intuition/intuition.h
 #include devices/printer.h
 #include devices/prtbase.h
...
 
 union  printerIO {
           struct IOStdReq     ios;
           struct IODRPReq     iodrp;
           struct IOPrtCmdReq  iopc;
           };

 union printerIO  *request;

 struct MsgPort  *printerPort;    
 
 struct PrinterData  *pdata;
 struct Preferences  *prefs;
 int error;

...

main
   {
   ... (libraries, init, etc)

   printerPort = (struct MsgPort *)CreatePort("myPrtPort",0);
  
   ... (error checking)
 
   request = (union printerIO *)CreateExtIO(printerPort,
                                               sizeof(union printerIO));

   error = OpenDevice("printer.device",0,request,0)
   ... (error checking)

   pdata = (struct PrinterData *)request->ios.io_Device;
   prefs = (struct Preferences *)&pdata->pd_Preferences;
   
   /* Giving you ptr to PrinterData structure 
       and printer device's copy of Preferences in that structure */

   printf("Prefs color0 = %x\n",prefs->color0);
   printf("NumRows = %x\n",pdata->pd_SegmentData->ps_PED.ped_NumRows);

   /* Last line prints one of the values from the printertag data */

   ...
   }

-- 
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Carolyn Scheppner -- CATS   >>Commodore Amiga Technical Support<<
                     UUCP  ...{allegra,ihnp4,rutgers}!cbmvax!carolyn 
                     PHONE 215-431-9180
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