如何將字符串轉換爲十六進制，反之亦然c？

Question

如何將字符串轉換爲十六進制，反之亦然c。例如：，像「謝謝」字符串以十六進制格式：7468616e6b20796f75並從十六進制7468616e6b20796f75到字符串：「謝謝」。有沒有辦法做到這一點？

在此先感謝

Answer 1

sprintf和sscanf是這種不夠好。

#include <stdio.h> 
#include <string.h> 

int main(void) { 
    char text[] = "thank you"; 
    int len = strlen(text); 

    char hex[100], string[50]; 

    // Convert text to hex. 
    for (int i = 0, j = 0; i < len; ++i, j += 2) 
    sprintf(hex + j, "%02x", text[i] & 0xff); 

    printf("'%s' in hex is %s.\n", text, hex); 

    // Convert the hex back to a string. 
    len = strlen(hex); 
    for (int i = 0, j = 0; j < len; ++i, j += 2) { 
    int val[1]; 
    sscanf(hex + j, "%2x", val); 
    string[i] = val[0]; 
    string[i + 1] = '\0'; 
    } 

    printf("%s as a string is '%s'.\n", hex, string); 

    return 0; 
} 

現在

$ ./a.out 
'thank you' in hex is 7468616e6b20796f75. 
7468616e6b20796f75 as a string is 'thank you'.