serial.cpp中的接收：
 

1.  
   serial_read(std::string &rcv_buf) {
2.  
   unsigned char msg;
3.  
   int ret, pos=0;
4.  
   char mn[2];
5.  
    
6.  
   tcflush(serial_fd_, TCIOFLUSH);//清掉串口缓存
7.  
   fcntl(serial_fd_, F_SETFL, 0);
8.  
   while (1) {
9.  
   ret = read(serial_fd_, &msg, 1);
10.  
    //printf("%X ",msg);
11.  
    if ((pos > 0 && msg == 0x55) || pos >= 1024){
12.  
    rcv_buf = rcv_buf.erase(rcv_buf.length()-1,1);
13.  
    return pos;
14.  
    }
15.  
    if (pos > 0) {
16.  
    sprintf(mn,"%02x",msg);
17.  
    rcv_buf=rcv_buf+mn+" ";
18.  
    pos++;
19.  
    }
20.  
    if (pos == 0 && msg == 0x55) {
21.  
    sprintf(mn,"%x",msg);
22.  
    rcv_buf=rcv_buf+mn+" ";
23.  
    pos++;
24.  
    }
25.  
    if (-1 == ret){
26.  
    return pos;
27.  
    }
28.  
    }
29.  
    }

用户函数中对string进行操作：

1.  
   string msg;
2.  
   serial_read(msg);
3.  
   char * byteStr = new char[strlen(msg.c_str())+1];
4.  
   strcpy(byteStr, msg.c_str());

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