findnext() function call fails on second call. Program crashes

Question

The _findnext() function is not working when called for the second time. Here is the code.

int main() {
    struct _finddata_t ffblk;
    intptr_t done;

    chdir("tmp");
    printf("Directory changed to dir successfully\n");

    done=_findfirst("*.txt",&ffblk);
    printf("Call to findfirst successful\n");
    printf("%s\n",ffblk.name);
    do{
        done=_findnext(done,&ffblk);
        printf("%s\n",ffblk.name);
    } while(!done);
    printf("Exited the main loop\n");
    getch();
}

The program crashes once it gets and prints the name of first two files in the folder tmp. The first file name printed is from the findfirst() function. The next file name is printed by findnext(). I have checked via debugging.

Now when findnext() is called the second time in the loop, the program crashes. I am using gcc and tried most of the things with return value too, but no success. Any ideas ?

Answer 1

Your problem is that you cannot assign the value of _findnext to your handle, you need two variables:

intptr_t handle = 0;
int done = 0;

handle = _findfirst("*.txt",&ffblk);
while(handle && done != -1)
{
    printf("%s\n",ffblk.name);
    done = _findnext(handle,&ffblk);
}