Hello,
I'd like to run check from within my c program a gnupg signature. The
easiest way should be to simply call gnupg, right? But how do i get
the output of that program into a string?
best regards,
niko 3 3383
Niko Schwarz <ni**********@g mx.net> wrote: I'd like to run check from within my c program a gnupg signature. The easiest way should be to simply call gnupg, right? But how do i get the output of that program into a string?
Unless you are prepared to resort to non-standard, platform-specific
solutions the only way you can do that is using the system() function
and have the external program write to a file. That file you read in
from the C program to get the output into your string.
<OT>
If you don't mind using a platform-specific solution and you're using
UNIX it might be worthwhile to have a look at the popen() function. I
guess that it's also available on Windows.
</OT>
Regards, Jens
--
\ Jens Thoms Toerring ___ Je***********@p hysik.fu-berlin.de
\______________ ____________ http://www.toerring.de Je***********@p hysik.fu-berlin.de writes: Niko Schwarz <ni**********@g mx.net> wrote: I'd like to run check from within my c program a gnupg signature. The easiest way should be to simply call gnupg, right? But how do i get the output of that program into a string?
Unless you are prepared to resort to non-standard, platform-specific solutions the only way you can do that is using the system() function and have the external program write to a file. That file you read in from the C program to get the output into your string.
But there's no portable way to tell an external program to write its
output to a file. Many systems will support
system("gpg blah blah > output.txt");
but most such systems probably also support the (non-standard) popen()
function. As long as you're writing non-portable code anyway, you
might as well do it in a way that avoids creating a superfluous
temporary file.
If you want to be fanatical about portability, you can have some
external source (the user or a config file) specify the command string
to be passed to system(), but I wouldn't bother.
(If you have questions about popen() that aren't answered by your
system's documentation, comp.unix.progr ammer is the place to ask
them.)
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
Keith Thompson <ks***@mib.or g> wrote: Je***********@p hysik.fu-berlin.de writes: Niko Schwarz <ni**********@g mx.net> wrote: I'd like to run check from within my c program a gnupg signature. The easiest way should be to simply call gnupg, right? But how do i get the output of that program into a string? Unless you are prepared to resort to non-standard, platform-specific solutions the only way you can do that is using the system() function and have the external program write to a file. That file you read in from the C program to get the output into your string.
But there's no portable way to tell an external program to write its output to a file. Many systems will support
system("gpg blah blah > output.txt");
I was assuming that either that is possible or that the external
program has some options to tell it to write its output to a file.
If neither of these assumptions is true the OP draws a blank;-)
Regards, Jens
--
\ Jens Thoms Toerring ___ Je***********@p hysik.fu-berlin.de
\______________ ____________ http://www.toerring.de This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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