• 问题：

char *buf = "EC|RN0851|PW0851|LC8,0|";
char *h = "hhh";

 strcat(h, buf);
strcpy(h, buf);

在ARC机制下使用ARC管理机制外的函数操作内存，程序直接崩溃，物错误提示

• 解决方案：

char *c = (char *) malloc(strlen(h) + strlen(buf));

PS:

    //ARC机制下操作内存需要申请
    char *str = "EC|RN0851|PW0851|LC8,0|";
    char pried = 0x02;
    char end = 0x03;
    char check = 0x01;
    char *buff = (char *) malloc(3 + strlen(str));
    
    strncpy(buff, &pried,1);

    strncat(buff, str, strlen(str));

    strncat(buff, &end,1);

    strncat(buff, &check,1);

    NSLog(@"length:%ld",strlen(&pried));//输出为4,所以单字符时可以写成数组等，或者如上
    
    for (int i = 0; i < strlen(buff); i++) {
        printf("-%x", buff[i]);
    }