Re: Reading IFS bin file into an RPG variable

[Kyle Collie <kcollie@xxxxxxxxx>]

When I compare hex-to-hex they are the same.

Yes, it is a GIF. The goal is to read the image into a variable that
can be passed back to a calling program to ultimately be displayed in
a browser.

Currently, the browser is displaying the åñã  /


On 1/21/06, Simon Coulter <shc@xxxxxxxxxxxxxxxxx> wrote:
>
> On 22/01/2006, at 3:16 AM, Kyle Collie wrote:
>
> > If I do a wrklnk on  an IFS file, I see this:
> >
> > GIF89a    ÷     ÿÿÿðíîGFG...
> >
> > But in debug, my temp variable contains this:
> >
> > åñã  /    7        0ÒÓåãå      x¿ÝzÞ^xÐÞ   ~xzwÝ(r)       (í ...
> >
> > Not nearly the same.
> >
> > What am I missing? If is a codepage issue?
>
> At least three things:
>         1) Your code is doing a binary read. What makes you think WRKLNK is
> doing the same?
>
>         2) This output:
>                         GIF89a    ÷     ÿÿÿðíîGFG...
> tells me you are viewing the contents of a GIF image file. GIF files
> are binary but use ASCII code points. The fact that WRKLNK (really DSPF
> file but ...) shows the characters GIF89a on your green screen in an
> EBCDIC CCSID tells me it is converting the data otherwise the
> characters wouldn't be recognisable. Thus DSPF is converting from the
> CCSID of the file (probably 819) to the CCSID of the job (probably 37)
> and is doing so, probably, because it opens the file using O_TEXTDATA.
>
>         3) Debug always shows the contents of variables using CCSID 65535
> (described in the help text) which means no character conversion is
> performed. It shows the raw content of the variable.
>
> When viewing data in binary you can only rely on the hexadecimal code
> points of each character. From the above 3 points you can see that the
> data in debug is the correct output. The data in DSPF has, probably,
> been converted from ASCII to EBCDIC.
>
> Using the F10=Display Hex option in DSPF will show you the hex data.
> This should match the hex output in debug.
>
> NOTE:- On 530 DSPF shows the real Hex data from the file content. On
> some earlier releases DSPF would show the Hex values of the converted
> output which is not much use at all.
>
> NOTE:- On some early releases DSPF only shows Hex output when using a
> 24*80 display device. It will not show hex output in wide-screen
> (27*132) mode--also less than helpful. I see this "oversight" has been
> corrected in 530. I don't know in exactly what release they fixed this.
>
> Regards,
> Simon Coulter.
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