Hi all, I'm trying to write a function for my assigment, that function need
to print out to both stdout and a file. My C program get user input by
scanf.
I intend to write a function like printf but i don't really know how:
I tried this, but it only can work with "pure" string, can't convert %d,
%.*lf...
> void dupPrint(FILE *fp,char *string)
> {
> printf("%s",string);
> fprintf(fp,"%s",string);
>
> return;
> }
>
I tried dup2 and freopen but they didn't work for me.
#include <stdio.h>
> #include <unistd.h>
> #include <fcntl.h>
>
> int main()
> {
> int file = open("input3.txt", O_APPEND | O_WRONLY);
> if(file < 0) return 1;
>
> if(dup2(file,1) < 0) return 1;
>
> printf("Redirect to file!\n");
> printf("Nhap vao so i : ");
> // scanf("%d",&i);
> //printf("%d\n",i);
>
>
> return 0;
> }
>
This dup2() tut only print to file.
I also tried tee, but may be it not work because I have to get input from
user (if work, it's not "fair" because tee isn't in my program).
Can anyone suggest a solution for my problem.
Thanks!
(sorry for my bad English).
--
Thanks & Best regards,
Nguyen Viet Hung (Mr)
Email: [email protected]
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