Hi all: I'm using gpg 1.4.10. Now I want to
operate it in my program, and I want to get the output info of gpg from popen,
in order that I can process them. Codes like the
following:----------------------------------------------------------------#include
<stdio.h>#include <sys/wait.h>#include <string.h>#include
<stdlib.h>int main(void){ FILE *fpout = popen("gpg
--verify yrp.sig yrp", "r"); char
buf[1024]; bzero(buf, 1024); int len =
fread(buf, 1024, 1, fpout); printf("The return of fread = %d,
The length of the buf = %d\n", len, strlen(buf));
printf("%s\n", buf); pclose(fpout); exit
(0);}----------------------------------------------------------------The result
didn't appear normal:gpg: Signature made Mon 04 Jul 2016 06:14:44 PM CST using
RSA key ID 5FEC9A32gpg: Good signature from "yuriping (3)
<[email protected]>"The return of fread = 0, The length of the buf = 0But
when I popen "ls" as following,
----------------------------------------------------------------#include
<stdio.h>#include <sys/wait.h>#include <string.h>#include
<stdlib.h>int main(void){ FILE *fpout = popen("ls",
"r"); char buf[1024]; bzero(buf,
1024); int len = fread(buf, 1024, 1,
fpout); printf("The return of fread = %d, The length of the
buf = %d\n", len, strlen(buf)); printf("%s\n",
buf); pclose(fpout); exit
(0);}----------------------------------------------------------------It worked
properly:The return of fread = 0, The length of the buf =
60popen_lspopen_ls.csignsign.cverifyverify.cyrpyrp.sigIt seems that the output
of gpg does not be redirected to the popen command buffer, it still output to
the stdout.I want to know what causes the difference, and how to fix it. By the
way, this issue appears when "popen("gpg --detach-sign yrp", "w")"Best Regards!
------------------------------------------
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