%stdin

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6 total messages Started by Miklos Somogyi Wed, 18 Dec 2002 15:39

#1315

Author: Miklos Somogyi
Date: Wed, 18 Dec 2002 15:39

15 lines
1347 bytes

Sometimes I need a few rgb <--> hsb conversions.
I edit a ps file and ask my trusted Level 2 Adobe
DPS to do the job.
If I need more, I edit more, etc.
Would dearly love to skip editing and have a mini
ps program to prompt me for rgb or hsb and print
the other set.
The problem is that read would not wait for input
on %stdin.

Could someone show me a program segment for any
simple write_prompt - read_answer dialogue?
If not, what's the use of %stdin ?

Miklos

Re: %stdin

#1316

Author: Marc Antoni Malagarriga i Picas
Date: Thu, 19 Dec 2002 08:25

17 lines
1256 bytes

I Miklos,

I consider more flexible read and write data with a controlled disk adress, like:

(DiskUnit/MyDir/MyOutputFile) (w) file /MyOutputFile exch def

and write and read data with prompt, like:

MyOutputFile (Merry Christmas Miklos !!) dup == writestring
(DiskUnit/MyDir/MyOutputFile) (r) file /MyImputFile exch def
MyImputFile 100 string readstring pop ==

This helps ?

... MaRC anToni
www.femfum.com
PostScript&PDF Tools Developers

Re: %stdin

#1317

Author: Miklos Somogyi
Date: Thu, 19 Dec 2002 13:39

25 lines
1473 bytes

Thanks and Happy Xmas, MaRC

I don't fully understand your scheme but if I need
to put my data in a file to read it by a ps
program, I might as well put the data in the ps program.

I don't know how and why, my Adobe DPS lets me open
a file for read:

(/dir/file1) (r) file /infile exch def

and lets me read from it, but

(/dir/file2) (w) file /outfile exch def

is not working, I get an invalidfileaccess error.

---

So my question still is: is it poss to read something from
%stdin in the manner of other languages (i.e. the DPS waits
until receives an lf), or not.
If not, what is the purpose of %stdin?

Miklos

Re: %stdin

#1318

Author: Aandi Inston
Date: Thu, 19 Dec 2002 14:21

4 lines
966 bytes

Many PostScript implementations disable file writing, to protect
against malicious code distributed as PostScript.

Aandi Inston

Re: %stdin

#1319

Author: Marc Antoni Malagarriga i Picas
Date: Thu, 19 Dec 2002 15:52

19 lines
1158 bytes

Hi Miklos,

Here is an example with %stdin and %stdout files:

% standard file in/out creation
(%stdin) (r) file /In exch def
(%stdout) (w) file /Out exch def

% writes the string
Out (Hi Noi!) writestring

% reads and prompts the string
In 50 string readstring pop ==

Hope this works for you ...

... MaRC anToni
(][ wwww.femfum.com
PostScript&PDF Tools Developers

Re: %stdin

#1320

Author: Miklos Somogyi
Date: Fri, 20 Dec 2002 04:42

15 lines
1245 bytes

Good point Aaandi, but I don't need to write to a file.
I only need to wite to the screen and "==" can do that.

MaRC, Ghostview does not accept "(%stdout) (w) file" at
all (invalidfileaccess), the Adobe DPS accepts it
but "Out (Hi Noi!) writestring" needs a flush, just
like == does.

However, the crucial part "In 50 string readstring pop =="
does nothing with/without flushing "(Hi Noi!)".
What DPS do you use?

Thanx

Miklos

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