Thread: Read each line in a text file when I press a key (inside while loop)? C

Hello everyone!

I know how to use fgets inside a while loop to read an entire text file, but how can I press a key inside that loop, so it will read another line, one at a time?
I tried with a simple printf("Press any key\n") getchar() but nothing happens, I run the programm and it just doesn't do anything, not even show the first line. I'm assuming this may be a stupid question but I can't find anywhere how to do this

Here is what I've tried:

Code:

/*  gcc readline.c -Wall -o read */


#include <stdio.h>
//#include <stdlib.h>








int main (int argc, char *argv[]) {


    char url[]="dbus.log";
    FILE *arq;
    char info[1000];
    
    arq = fopen(url, "r");
    
        while( (fgets(info, sizeof(info), arq))!=NULL ){        
            
            printf("%s", info);
            printf("Press Any Key to Continue\n");  
            getchar();   
            
        }
        
    fclose(arq);
    
     return 0;
}

Any clues on how to proceede?

You should check to insure that the file actually opens.

Jim

Hey Jim!

I checked and it was reading the entire file without problem (the file is on the same directory), but i forgot something very important inside the while loop..... just forgot to put a fflush(stdout); before I use getchar()... . Here is the code working 100%:

Code:

/*  gcc readline.c -Wall -o read */


#include <stdio.h>
//#include <stdlib.h>


int main (int argc, char *argv[]) {


    char url[]="dbus.log";
    FILE *arq;
    char info[1000];


    arq = fopen(url, "r");


    while (fgets(info, sizeof(info), arq) != NULL) {        
        printf("%s", info);
        fflush(stdout);
        printf("Press Any Key to Continue\n");  
        getchar();   
    }


    fclose(arq);
    return 0;
}

Thanks for your answer Jim!

Originally Posted by kdan

just forgot to put a fflush(stdout); before I use getchar()

That's unlikely to have been the problem since the terminal is normally line-buffered so that outputting a newline will automatically flush it. And it's not "press ANY key" but "press the ENTER key".

@itsme86 Yeah it is, and I'm sorry for that, I just needed to make it work as soon as possible, and it won't happen again

@algorism, I'm actually running it in Msys2 and not in a Linux OS, not sure if it interfere, but I do need to use the fflush otherwise it won't work, and yes indeed is not any key but enter key.