串口发送接收数据信息（接收不到信息超时）

[zoushunliang]

我写了个发送接收程序，不知道哪里错了，我也刚了解这个，请各位大虾帮我找找问题出在哪？谢谢
急！！！！！！！！！！！



using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using System.IO.Ports;

namespace Serialexpample
{
partial class Form1 : Form
{
PropertyPage pp = new PropertyPage();

SerialPort sp = new SerialPort();

public Form1()
{
InitializeComponent();
}

private void propertyButton_Click(object sender, EventArgs e)
{
pp.ShowDialog();

propertyButton.Hide();
}

private void sendButton_Click(object sender, EventArgs e)
{
try
{
sp.WriteLine(textBox.Text);//发送数据
textBox.Text = "";
}
catch (System.Exception ex)
{
baudRatelLabel.Text = ex.Message;
}

}

private void ReadButton_Click(object sender, EventArgs e)
{
try
{
textBox.Text = "";
textBox.Text = sp.ReadLine();//接受数据
}
catch(System.Exception ex)
{
baudRatelLabel.Text = ex.Message;
}
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
MessageBox.Show("Do u want to Close the App");
sp.Close();
}

private void startCommButton_Click(object sender, EventArgs e)
{
startCommButton.Hide();
sendButton.Show();
ReadButton.Show();
textBox.Show();
}

private void saveStatusButton_Click_1(object sender, EventArgs e)
{
if (pp.bRate == "" && pp.sBits == "")
{
dataBitLabel.Text = "BaudRate = " + sp.BaudRate.ToString();//设置串口通讯波特率
readTimeOutLabel.Text = "StopBits = " + sp.StopBits.ToString();//设置串口通讯停止位
}
else
{
dataBitLabel.Text = "BaudRate = " + pp.bRate;
readTimeOutLabel.Text = "StopBits = " + pp.sBits;
}

parityLabel.Text = "DataBits = " + sp.DataBits.ToString();//设置串口通讯数据位
stopBitLabel.Text = "Parity = " + sp.Parity.ToString();//设置串口通讯奇偶校验位
readTimeOutLabel.Text = "ReadTimeout = " +
sp.ReadTimeout.ToString();

if (propertyButton.Visible == true)
propertyButton.Hide();
saveStatusButton.Hide();
startCommButton.Show();

try
{
sp.Open();
sp.ReadTimeout = 500;
}
catch (System.Exception ex)
{
baudRatelLabel.Text = ex.Message;
}
}

}
}

[freeboy827]

没有看到你设置了串口的参数啊,

[zoushunliang]

默认的不行吗？不是可以不设置嘛！~

[zoushunliang]

大家有类似的案例程序吗？

[wudliang]

将你的代码改了一下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using System.IO.Ports;

namespace Serialexpample
{
    partial class Form1 : Form
    {
        PropertyPage pp = new PropertyPage();

        SerialPort sp = new SerialPort();

        public Form1()
        {
            InitializeComponent();
            sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
        }

        //响应串口接收到数据事件。
        private void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            try
            {
                string tmp = sp.ReadExisting(); //读取接收到的数据。
            }
            catch { }

            //防止文本框溢出
            int n = textBox.Text.Length;
            int m = tmp.Length;
            if (n + m > 32000)
                textBox.Text = textBox.Text.Substring(m, n - m);

            textBox.AppendText(tmp);
            textBox.Select(textBox.Text.Length, 0);
        }

        private void propertyButton_Click(object sender, EventArgs e)
        {
            pp.ShowDialog();

            propertyButton.Hide();
        }

        private void sendButton_Click(object sender, EventArgs e)
        {
            try
            {
                sp.WriteLine(textBox.Text);//发送数据 
                textBox.Text = "";
            }
            catch (System.Exception ex)
            {
                baudRatelLabel.Text = ex.Message;
            }

        }

        //private void ReadButton_Click(object sender, EventArgs e)
        //{
        //    try
        //    {
        //        textBox.Text = "";
        //        textBox.Text = sp.ReadLine();//接受数据 
        //    }
        //    catch (System.Exception ex)
        //    {
        //        baudRatelLabel.Text = ex.Message;
        //    }
        //}

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            MessageBox.Show("Do u want to Close the App");
            sp.Close();
        }

        private void startCommButton_Click(object sender, EventArgs e)
        {
            startCommButton.Hide();
            sendButton.Show();
            ReadButton.Show();
            textBox.Show();
        }

        private void saveStatusButton_Click_1(object sender, EventArgs e)
        {
            if (pp.bRate == "" && pp.sBits == "")
            {
                dataBitLabel.Text = "BaudRate = " + sp.BaudRate.ToString();//设置串口通讯波特率 
                readTimeOutLabel.Text = "StopBits = " + sp.StopBits.ToString();//设置串口通讯停止位 
            }
            else
            {
                dataBitLabel.Text = "BaudRate = " + pp.bRate;
                readTimeOutLabel.Text = "StopBits = " + pp.sBits;
            }

            parityLabel.Text = "DataBits = " + sp.DataBits.ToString();//设置串口通讯数据位 
            stopBitLabel.Text = "Parity = " + sp.Parity.ToString();//设置串口通讯奇偶校验位 
            readTimeOutLabel.Text = "ReadTimeout = " +
                      sp.ReadTimeout.ToString();

            if (propertyButton.Visible == true)
                propertyButton.Hide();
            saveStatusButton.Hide();
            startCommButton.Show();

            try
            {
                sp.ReadTimeout = 500;
                sp.Open();
            }
            catch (System.Exception ex)
            {
                baudRatelLabel.Text = ex.Message;
            }
        }

    }
}

[jdhlowforever]

[Quote=引用 3 楼 zoushunliang 的回复:]
大家有类似的案例程序吗？
[/Quote]
我有，加我QQ： 10906266