output « buffer « C Q&A

1. capturing commandline output directly in a buffer    stackoverflow.com

I want to execute a command using system() command or execl and want to capture the output directly in a buffer in C. Is ther any possibility to capture the output ...

2. How this simple program works, I/O related    stackoverflow.com

This is my program:

#include <stdio.h>
int main(int argc, char* argv[]) {
  char buf[1024] = {0};
  setvbuf(stdout, buf, _IOFBF, 1024);
  printf("error\n");
  printf("%s\n", buf);
}

error
error

Exited: ExitFailure 7

3. Output Help. Buffer Size Maybe?    cboard.cprogramming.com

4. Flushing the output buffer from printfs?    cboard.cprogramming.com

I have this piece of code, used as a debugging tool: printf("%d", p->digits[0]); printf("%d", p->digits[0]); It printed out 21. This is logically impossible, and it's not a junk number. I tried putting just the first line alone, and even the first line alone with different indexes and got correct output. I figure the only possible way to get this error, and ...

5. Bad output -- possible input buffer problems    cboard.cprogramming.com

Code: #include // functions void getNumberAndBase(void); void convertNumber(void); void displayConversion(void); void clear_line(void); // globals int gConvertedNumber[64], gBase, gDigit = 0; unsigned long long gNumber; int main(void) { int stop = 1; char ch; while (stop == 1) { //1. get the number and coversion base getNumberAndBase(); if (gNumber == 0) stop = 0; else { //2. convert the number by ...

6. Output buffer flushing    forums.devshed.com

[windows, dev c++] I have this piece of code, used as a debugging tool: printf("%d", p->digits[0]); printf("%d", p->digits[0]); It printed out 21. This is logically impossible, and it's not a junk number. I tried putting just the first line alone, and even the first line alone with different indexes and got correct output. I figure the only possible way to get ...

7. Redirecting standard output to buffer    forums.devshed.com

Hi, I am using Clamv as antivirus program to check for any virus infected files. How do I execute the command for invoking the antivirus program and interpret the results. System only indicates whether the command was executed successfully or not, however I need to get the results returned by Clamv. The command to be executed for checking the files for ...

8. How to buffer output?    daniweb.com

#define MAX_BUFFER 1000 char BUFFER[MAX_BUFFER]; BUFFER[0] = '\0'; strcat(BUFFER, toPrint);/*toPrint contains whatever u wanted to print*/ /*but check for the buffer content size because if it exceed MAX_BUFFER u wil get seg fault*/ /*do it for every printf("%s", toPrint)*/ printf("The size of the buffer is: %i\n", strlen(BUFFER)); // 2. Get and print the size of the buffer. printf("Here is the output:\n\n%s", ...