Status report Monday 05-Nov-01: Question about CGM support in plo tutils-2.4.1

[David Humphrey]

I've spent some time walking through the code in the debugger and now
believe that the extra byte '0d' is introduced into the output stream when
libplot writes the output cgm file to disk.  Therefore, it must be the way
I'm opening the output file.

It now dawns on me that I left out some important information.  I've taken
plotutils-2.4.1 and compiled libplot on Windows NT using Microsoft Visual
Studio 6.0.  So, this bug is probably a case of misuse on my part since
Windows and UNIX treat files a bit differently.  I'll resolve this problem
and submit the fix for your information.

Regards,
David L. Humphrey
Director, Technical Services
Bell Geospace, Inc

>  -----Original Message-----
> From:         David L. Humphrey [mailto:address@hidden 
> Sent: Saturday, November 03, 2001 3:02 PM
> To:   address@hidden
> Subject:      Additional Information: Question about CGM 
> support in plotutils-2.4.1
> 
> I have some additional information on this problem.  I sat 
> down and decoded the binary CGM file by hand in a effort to 
> discover the problem.  It seems that there is an error in the 
> encoding of the first Restricted Text command starting at 
> byte 0x198.  The 0x0d byte at 0x19a does not belong there.  I 
> removed it and the Microsoft products read the file properly.
> 
> It's odd that the first Restricted Text command is erroneous 
> while the following two are correct.  I'll peruse the code 
> Monday in an effort to spot the bug.  If I can find it, I'll 
> submit a correction.  However, I strongly request that you 
> look for this one, too.
> 
> Regards,
> David L. Humphrey
> Director, Technical Services
> Bell Geospace, Inc
> 
        >  -----Original Message-----
        > From:         David Humphrey  
        > Sent: Friday, November 02, 2001 12:10 PM
        > To:   'address@hidden'
        > Subject:      Question about CGM support in plotutils-2.4.1
        > 
        > Attached are two test files I produced from plotutils-2.4.1.  
        > The only difference is that I changed the encoding from 
        > "binary" to "cleartext".  Microsoft Word & Powerpoint will 
        > display the cleartext version, but report an error for the 
        > binary one.  At first, I thought the Microsoft products would 
        > not display binary CGMs at all, but this is not the case as I 
        > have displayed several intricate ones without problems.
        > 
        > Would you please advise me on where the problem resides?  Am 
        > I misusing plotutils in some way?
        > 
        > Regards,
        > David L. Humphrey
        > Director, Technical Services
        > Bell Geospace, Inc
        > 
        >  << File: binV1.cgm >>  << File: ctV1.cgm >>