上位机串口通信

http://blog.sina.com.cn/s/blog_9faf08510101dhk0.html

2013

  private void serialPort1_DataReceived(objectsender, System.IO.Ports.SerialDataReceivedEventArgs e)
       {

           //先读取下位机发来的数据，然后就比较
           //如果是呼叫我，则回复他
           //下位机接到回复后就发数据过来，这边要接收
           //吧接受的数据与该用户的之前的数据进行比较
           //如果是减肥成功了，就form5,否则就form4
           //最后就插入该用户刚刚测试的数据

           if (serialPort1.IsOpen == false)
           {
               return;
           }
          Thread.Sleep(2000);
           int c = serialPort1.BytesToRead; //获取缓冲区中的字节数
           //int n = serialPort1.ReadBufferSize;
           byte[] buf = new byte[c];//声明一个临时数组存储当前来的串口数据
           StringBuilder strbuilder = new StringBuilder(buf.Length);
           serialPort1.Read(buf, 0, c);//读取缓冲数
           //data =System.Text.Encoding.ASCII.GetString(buf);//将RevData中的数据转换成字符串
           string str2="";
           int data = 0;
           if (c == 1)
           {
               foreach (byte b in buf)
               {
                   strbuilder.Append(b.ToString("X2"));//如果两个数10和26，正常情况十六进制显示0xA、0x1A，这样看起来不整齐，为了好看，我们可以指定X2，这样显示出来就是：0x0A、0x1A。
               }
               data = 0;
               //data =int.Parse ( strbuilder.ToString());
               data = Convert.ToInt32(strbuilder.ToString(),16);
             //MessageBox.Show(c+" " + data);
           }
           else if(c>=2)
           {
               for (int i = 0; i <= 1;i++ )
                  
                   {
                       string strtemp =Convert.ToString(Convert.ToInt32(buf[i].ToString("X2"), 16), 2);//如果两个数10和26，正常情况十六进制显示0xA、0x1A，这样看起来不整齐，为了好看，我们可以指定X2，这样显示出来就是：0x0A、0x1A。
                       int str_length = strtemp.Length;
                       if (str_length < 8)
                       {
                           int temp = 8 - str_length;
                           for (int ii = 1; ii <= temp; ii++)
                           {
                               strtemp = "0" + strtemp;
                           }
                       }
                       str2 += strtemp;

                   }
               data=Convert.ToInt32(str2, 2);
               MessageBox.Show("称得数据："+data+"（百克）");
               
           }