Hex to ascii string conversion

Question

i have an hex string and want it to be converted to ascii string in C. How can i accomplish this??

Answer 1

strtol() is your friend here. The third parameter is the numerical base that you are converting.

Example:

#include       /* printf */
#include      /* strtol */

int main(int argc, char **argv)
{
    long int num  = 0;
    long int num2 =0;
    char * str. = "f00d";
    char * str2 = "0xf00d";

    num = strtol( str, 0, 16);  //converts hexadecimal string to long.
    num2 = strtol( str2, 0, 0); //conversion depends on the string passed in, 0x... Is hex, 0... Is octal and everything else is decimal.

    printf( "%ld\n", num);
    printf( "%ld\n", num);
}