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Execute a Shell command silently and get the Output

Hello everyone,

I was looking for a way to execute a shell command (e.g. "ping localhost") without the user seeing a command shell(Win XP)
and recieve its output. Any ideas on that?

Thank you in advance,
Lord.
0
LordTTSeven
Asked:
LordTTSeven
  • 2
1 Solution
 
mnashadkaCommented:
You can use _popen to open the command as a FILE *, and then use the standard fgets/fscanf/etc. functions to read the result, then use _pclose to close the stream.  Hope this helps.
0
 
chensuCommented:
Call ShellExecute() with the SW_HIDE flag. Or call CreateProcess() with the DETACHED_PROCESS flag.
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LordTTSevenAuthor Commented:
chensu:

I honestly dont get it how to recieve the Output here?

mnashadka:

This code:

#include <stdio.h>

void main(void) {
      FILE* cons;
      char s[999];
      cons = _popen("ping localhost","r");
      
      while(fscanf(cons,"%s",s))
            printf("%s",s);
      
      _pclose(cons);
      scanf("%s",s);
}

Provides me this(excuse my german Windows)

C:\User\VC>shellexec
Pinglord2[127.0.0.1]mit32BytesDaten:Antwortvon127.0.0.1:Bytes=32Zeit<1msTTL=128A
ntwortvon127.0.0.1:Bytes=32Zeit<1msTTL=128Antwortvon127.0.0.1:Bytes=32Zeit<1msTT
L=128Antwortvon127.0.0.1:Bytes=32Zeit<1msTTL=128Ping-Statistikfür127.0.0.1:Paket
e:Gesendet=4,Empfangen=4,Verloren=0(0%Verlust),Ca.ZeitangabeninMillisek.:Minimum
=0ms,Maximum=0ms,Mittelwert=0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0
ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms
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s0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0
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0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms0ms^C

It somehow does neither get CRLFs nor Spaces, and the last word(?) is repeatet untill i press CTRL+C...

Thank you, Lord.
0
 
mnashadkaCommented:
fscanf ignores whitespace, and i suggest that the end part is related to the buffer not being cleared out.  Change fscanf to fgets, and you'll get better results:

#include <stdio.h>

void main(void) {
     FILE* cons;
     char s[999];
     cons = _popen("ping localhost","r");
     
     while(fgets(s, 999, cons))
        printf("%s",s);
     
     _pclose(cons);
     scanf("%s",s);
}
0
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