unsigned char指针内容如何比较？

Question

C++ 比如我有一个unsigned char * p={101,202,12,8,0,32,46,58,231,255,18,64,78}
问：
1:如何判断p(3-4)=={8,0} 且 p(9)={255}
2:如何判断{231,255,18,64}的起始位置，返回8

Answer 1

如果你硬要用 * 的话，你就将下面的访问方式改成 * (p+id)即可

const int num=13;
unsigned char p[num]={101,202,12,8,0,32,46,58,231,255,18,64,78};
bool judge3=(p[3]==8)? true : false;
bool judge4=(p[4]==0)? true : false;
bool judge9=(p[9]==255)? true : false;
bool judge_condition2=false;
int judge_condition2_id=0;
for(int id=0;id!=num;id++)
{
    if(p[id]==231 && (id+3<num && p[id+3]==64) && p[id+2]==18 && p[id+1]=255)
    {
        judge_condition2=true;
        judge_condition2_id=id;
        break;
    }
}
if(judge_condition2)
    printf("judge_condition2_id:%d \n",judge_condition2_id);