Reading an output from another program

[joelf223]

Hi,
I'm trying to get this program to read, then print, the output from another short program (hw7.c) it compiles fine but then does not return the values I want it to. I'm assuming I have a problem with my fscanf function. Any help would be great.

 
/* the idea is to read the ouput from hw7.c and return these values */
#include <stdio.h>
#define FILENAME "hw7.c"
int main(void)
{
/* declare and initialize variables */
float max, min;
FILE *hw7;
 
/* open input program */
 
hw7 = fopen("hw7.c", "r");
if ( hw7 == NULL)
    printf("Error opening hw7. \n");
/* good to go above here */
 
fscanf(hw7, "%f %f", &max, &min);
 
/*print summary */
printf("Max: %f \n", max);
printf("Min: %f \n", min);
 
/* close input program */
 
fclose(hw7);
 
return 0;
}
 

Thanks,
Joel

[gpraghuram]

Hi,
I'm trying to get this program to read, then print, the output from another short program (hw7.c) it compiles fine but then does not return the values I want it to. I'm assuming I have a problem with my fscanf function. Any help would be great.

 
/* the idea is to read the ouput from hw7.c and return these values */
#include <stdio.h>
#define FILENAME "hw7.c"
int main(void)
{
/* declare and initialize variables */
float max, min;
FILE *hw7;
 
/* open input program */
 
hw7 = fopen("hw7.c", "r");
if ( hw7 == NULL)
    printf("Error opening hw7. \n");
/* good to go above here */
 
fscanf(hw7, "%f %f", &max, &min);
 
/*print summary */
printf("Max: %f \n", max);
printf("Min: %f \n", min);
 
/* close input program */
 
fclose(hw7);
 
return 0;
}
 

Thanks,
Joel

If u are reading the C code , how u can use a float to read it.
It shuld be a char buffer u shuld be using.

Raghuram

[weaknessforcats]

If you are really going to read the output from another program, then you have to execute that program and not just read its source code.

[Ganon11]

Maybe you could run hw7.c and store its output in a file, then run this program and read from that file, rather than reading from hw7.c (which will have you reading C code).

[AHMEDYO]

HI...

if i understand you correctlly, you must create your exe file from hw7.cpp program and use API createProcess to run it and then use Pipe to read output from it.