C# 串口通信 求助

Question

本帖最后由 u011825449 于 2013-08-26 14:01:49 编辑

Answer 1

这是我写的代码，请高手看看那里出错了？
void comm_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            if (IsClosing)
                return;
            try
            {
                Listening = true;
                int n = comm.BytesToRead;  
                byte[] buf = new byte[n];
                received_count += n;
                comm.Read(buf, 0, n);//读取缓冲数据  
               
                bool data_1_catched = false;//缓存记录数据是否捕获到  
               
                buffer.AddRange(buf);
                 
                while (buffer.Count >= 8)
             
                {
                    if (buffer[0] ==0x16 && buffer[1] == 0x16 && buffer[2] == 0x01 && buffer[3] == 0x30
                       && buffer[4] == 0x30 && buffer[5] == 0x02 && buffer[62]==0x03)
                 
                    {
                        
                        int len = n - 8;                        if (buffer.Count < len + 8)
                            break;
                        else
                        {
                            byte checksum = 0;
                            for (int i = 2; i <len + 7; i++)
                            {
                                checksum ^= buffer[i];
                            }
                            if (checksum != buffer[len + 7])
                            {
                                buffer.RemoveRange(0, len + 8);                                continue;
                            }
                            else
                            { 
                                buffer.CopyTo(0, Hex_data_1, 0, len + 8);
                            
                            }
                        }
    
                        data_1_catched = true;
                        buffer.RemoveRange(0, len + 8);
     
                    }
                    else
                    {
                      
                        buffer.RemoveAt(0);
                    }
                  
                }
                
                    builder.Clear();//清除字符串构造器的内容  
                //因为要访问ui资源，所以需要使用invoke方式同步ui。  
                this.Invoke((EventHandler)(delegate
                {
                    //判断是否是显示为16进制  
                    if (checkBoxHexView.Checked)
                    {
                        //依次的拼接出16进制字符串  
                        foreach (byte b in buf)
                       // foreach (byte b in buf)
                        {
                            builder.Append(b.ToString("X2") + " ");
                            string bStr = b.ToString("X2");
                            if (bStr == "FF" || bStr == "EF")
                            {
                                builder.Append("\r\n");
                            }
                        }
                    }
                    else
                    {
                        //直接按ASCII规则转换成字符串  
                        builder.Append(Encoding.ASCII.GetString(buf));
                    }
                    //追加的形式添加到文本框末端，并滚动到最后。 
                     string temp = buffer.ToString();
                    string result="";
                    for (int m = 0; m <=n; m++)
                    {
                        
                        result = result + Convert.ToString(buffer[m]);
                       
                    }
                    txGet.Text = result;
                    //修改接收计数  
                    labelGetCount.Text = "Get:" + received_count.ToString();
                }));
            }
            finally
            {
                Listening = false;//我用完了，ui可以关闭串口了
            }
        }

Answer 2

 int n = comm.BytesToRead;  我想请教一下上面的代码，我调用ByteToRead成员时抛出“端口已关闭”的异常，可能是什么原因。我加入监视，其实在调用ByteToRead前端口都是打开的。