将IP地址转换为二进制表示

string convert(char* cur, int size) {
    char byte[10] = {0};
    memcpy(byte, cur - size, size);
    unsigned int value = atoi(byte);
    char final_value[9] = {0};
    for (int i = 0; i < 8; i++) {
        final_value[8 - i -1] =  '0' + value % 2 - 0;
        value = value / 2;
    }

    string ret = final_value;
    return ret;
}

string atob(char* p) {
    string ret = "";

    if (NULL == p) return "";

    int length = 0;

    while ('\0' != *p) {
        if ('.' == *p) {
            ret += convert(p, length);
            length = 0;
        } else {
            length++;
        }

        p++;
    }

    ret += convert(p, length);

    return ret;
}

void main()
{
  string final_bin = atob("192.168.6.16");
}