C语言char*字符串数组和unsigned char[]数组的相互转换

#include <iostream>
#include <string>
using namespace std;

void convertUnCharToStr(char* str, unsigned char* UnChar, int ucLen)
{
    int i = 0;
    for(i = 0; i < ucLen; i++)
    {
        //格式化输str,每unsigned char 转换字符占两位置%x写输%X写输
        sprintf(str + i * 2, "%02x", UnChar[i]);
    }
}

void convertStrToUnChar(char* str, unsigned char* UnChar)
{
    int i = strlen(str), j = 0, counter = 0;
    char c[2];
    unsigned int bytes[2];

    for (j = 0; j < i; j += 2)
    {
        if(0 == j % 2)
        {
            c[0] = str[j];
            c[1] = str[j + 1];
            sscanf(c, "%02x" , &bytes[0]);
            UnChar[counter] = bytes[0];
            counter++;
        }
    }
    return;
}

int main()
{
    unsigned char src[6] = {0x12, 0x32,0x56,0x78,0x90,0xab};
    char buffer[20];//维数定义些
    convertUnCharToStr(buffer, src, 6);
    printf("%s\n", buffer);


    unsigned char dst[6];
    int len = strlen(buffer);
    cout << len << endl;
    convertStrToUnChar(buffer, dst);

    int i = 0;
    for(i = 0; i < 6; i++)
    {
        printf("%x ", dst[i]);
    }
    cout << endl;


    return 0;
}