setting execv arguments

[Douglas Dillon]

I am trying to use tiffcp to reconfigure tif files (if they are tiled)
to nontiled so I can use existing code to handle them. However, I am
having issues providing the arguments. The app is run from a temp
directory which has local copy of tiffcp.

///////////////////////////////////////////////////////////////////////////
char *args[] = { "tiffcp", "-p", "contig", "-s", "-r", "1", "-c",
"none", stripe->tif_file_name, dstfile };

if (execv(NULL, args) == -1)
///////////////////////////////////////////////////////////////////////////

What is the proper format?

Thanks,

Douglas

[Walter Roberson]

In article <8e**************************@posting.google.com >,
Douglas Dillon <do***********@yahoo.ca> wrote:
:I am trying to use tiffcp to reconfigure tif files (if they are tiled)
:to nontiled so I can use existing code to handle them. However, I am
:having issues providing the arguments. The app is run from a temp
:directory which has local copy of tiffcp.

:char *args[] = { "tiffcp", "-p", "contig", "-s", "-r", "1", "-c",
:"none", stripe->tif_file_name, dstfile };

:if (execv(NULL, args) == -1)

execv() is not part of C itself, so this is not covered by the C standard.

:What is the proper format?

I've never seen NULL as the first argument of execv() before.
The first argument should be the path to the executable. If it is in
your current directory, then you would use "./tiffcp" as the path
in your case.
--
Beware of bugs in the above code; I have only proved it correct,
not tried it. -- Donald Knuth

[Mark McIntyre]

On 12 Mar 2005 09:05:54 -0800, in comp.lang.c , do***********@yahoo.ca (Douglas
Dillon) wrote:

I am trying to use tiffcp to reconfigure tif files
neither this...
if (execv(NULL, args) == -1)
.... nor this....
What is the proper format?

.... is defined by the C standard. Its thus offtopic here, and you'd be better to
ask in comp.unix.programming.

--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt>

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[Jens.Toerring]

Walter Roberson <ro******@ibd.nrc-cnrc.gc.ca> wrote:

In article <8e**************************@posting.google.com >,
Douglas Dillon <do***********@yahoo.ca> wrote:
:I am trying to use tiffcp to reconfigure tif files (if they are tiled)
:to nontiled so I can use existing code to handle them. However, I am
:having issues providing the arguments. The app is run from a temp
:directory which has local copy of tiffcp. :char *args[] = { "tiffcp", "-p", "contig", "-s", "-r", "1", "-c",
:"none", stripe->tif_file_name, dstfile }; :if (execv(NULL, args) == -1) execv() is not part of C itself, so this is not covered by the C standard.
And thus questions should be asked in e.g. comp.unix.programmer;-)
:What is the proper format? I've never seen NULL as the first argument of execv() before.
The first argument should be the path to the executable. If it is in
your current directory, then you would use "./tiffcp" as the path
in your case.

<OT>
And you need a additional NULL pointer at the end of the 'args' array.
</OT>
Regards, Jens
--
\ Jens Thoms Toerring ___ Je***********@physik.fu-berlin.de
\__________________________ http://www.toerring.de