Thread: copy application-output into a txt-file

Hi,

at first i want to say, that i´m a beginner in c-programming and i didn´t find any thread which helps me

now i try to describe my problem:

i want to save the output from an application (for example "tracert.exe" from Windows) into a txt.file. But i don´t know how i have to code it.

i tried to use the function 'system("tracert.exe .....")' from <stdlib.h> and fill this output in an array so i can write the characters of the array in this txt.file, but it doesn´t work

i think the cause is the "printf()" function from "tracert" - can i devert the output? if yes - how?

can anybody help me or give me some advice?

thx

tracert.exe > output.txt

If you enter this on the command line the output (stdout) of the program tracert.exe is written to the file output.txt.

System("tracert.exe > output");
This should work.

thx Sargnagel for this advice. it is working now

i think i tried already - but i got the error "to many arguments (or parameters)" - its possible that i made an other mistake - i dont know it anymore.

i am really happy that this code is working now many many thx

Here's another way which reads the output directly in to you're program by using _popen(). This example is running the DIR command then printing the DIR output with printf(). Then you can write to file or anything, also modify the output.

Code:

#include <stdio.h>

void Dir(char* Path)
{
     char   Buffer[128];
     char   CommandLine[128];
     FILE* fin;
 
     sprintf(CommandLine, "DIR %s", Path);

     if ((fin = _popen(CommandLine, "r")) !=  NULL) 
     {
          while( !feof( fin ) )
          {
               if( fgets( Buffer, 128, fin ) != NULL )
               {
                    printf("My Output>>: " );
                    printf( Buffer );
               }
          }
          _pclose(fin);
     }
}

int main()
{
     Dir("C:\\");

     return 0;
}