displaying JPGs & GIFs?

[Robert E. Carneal]

In Quickbasic 4.5, I displayed Gifs & Jpgs by using a Dos
graphics viewer and simply shelling to that. Example:

Filename$ = "C:\Acctng\Showjpg c:\Acctng\Owner.pg"
Shell Filename$

And it worked.

When I tried that in Powerbasic, it did not. So I thought I
would simply write it again in Quickbasic, compile it to an
EXE and just use Shell to call it again from Powerbasic. No go.

So I am stuck- how do I display a GIF & JPGs/JPEGs from
Powerbasic? Someone told me convert them to SCRs but I am not
sure what they are.

I am using Powerbasic 3.5 for Dos.

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[Gustavo Asplanatti]

Robert:

I have proven and it worked.
Do you have enough free memory?
It can also prove some routines that exist in:
http://www.powerbasic.com/files/pub/pbdos/

There is several that you can use to visualize GIF and JPG.

Be luck!!

Gustavo Asplanatti
[email protected]



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Gustavo Asplanatti

[Tom Hanlin]

In what way does it not work? Have you checked ERR after the SHELL?

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Tom Hanlin
PowerBASIC Staff

[Robert E. Carneal]

Tom-

It closes the Dos window. I am using Windows Me. I am using an
AMD 850 processor. I have 38G free remaining on the hard drive.
In Windows, the message says:

The program has performed an illegal operation
and will be terminated. Quit all programs and
then restart your computer.

If the program consistently encounters problems,
click the Start button, then select Help,
Troubleshooting, and "If you have trouble running
MS-DOS programs.

Yes, I tried trapping the error using ERR. As near as I can tell, the
program attempts to run that Shell command, but MS-DOS seems
to stop before actually going back to the program. (Well, that is
how is appears to me.) I am not sure it gets far enough to get
to the routine to report the ERR number. Let me admit this: I am
not THAT good at using ERR, and ERL. Our professor at school
told us if we were good at this, then we did not need it. I wish
he taught it anyway.

My thinking at this point is the viewer itself is probably ok, it
works from the Dos prompt and also works from the SHELL inside
Quickbasic.

Should I post the code? It is only two lines. If I
do, anyone wanting to try it will also need a copy of the
graphics viewer. I am not sure how to post EXE files, it is
shareware though.

Thanks guys.

Robert

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[Tom Hanlin]

Oooh. Bad professor! Bad! Proper use of ERR is vital for writing robust
software, besides being awfully handy for debugging.

Did you try the PowerBASIC program only inside the IDE? You might want
to compile the program to an .EXE and run that instead. That will make
a difference in terms of memory used (conventional and maybe EMS).

Have you tried SHELLing other programs from PowerBASIC? This problem is
most likely tied to SHOWJPG, but it would be worth making sure.

You can find PB/DOS source code for viewing a variety of image formats
in the Downloads area here.


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Tom Hanlin
PowerBASIC Staff