使用C#编写的上位机软件，尝试使用9600bps进行连接，但是在选择确认可以连通的COM口后，却大部分连接失败，只要极少数情况可以连接成功，而不是完全无法连通，具体代码如下，请帮忙看看，该部分代码是否存在问题，能否帮忙提点意见，谢谢
namespace IonosphericScintillationMonitor.UI
{
public partial class ConnectNovatelReceiverStatusForm : Form
{
private string portName;
private int baudRate;
public ConnectNovatelReceiverStatusForm()
{
InitializeComponent();
this.FormBorderStyle = FormBorderStyle.FixedDialog;
//this.ControlBox = false;//不显示最小、最大和关闭按钮
this.MinimizeBox = false;
this.MaximizeBox = false;
this.StartPosition = FormStartPosition.CenterScreen;
InitializeSerialPort();
}
private void InitializeSerialPort()
{
//注册表中与串口设置相关的名称/值对的名称
const string PORTNAME_VALUE = "PortName";
const string BAUDRATE_VALUE = "BaudRate";
string rootName = "HKEY_CURRENT_USER";
string keyName = rootName + "\\" + "Software" + "\\"
+ "IonosphericScintillationMonitor" + "\\" + "ComSet";
//读取注册表中串口的默认值
try
{
this.portName = (string)Registry.GetValue(keyName, PORTNAME_VALUE, null);
this.baudRate = Convert.ToInt32(Registry.GetValue(keyName, BAUDRATE_VALUE, null));
}
catch (SecurityException e)
{
BaseSupportTools.PrintExceptionMessage(e);
}
catch (IOException e)
{
BaseSupportTools.PrintExceptionMessage(e);
}
catch (ArgumentException e)
{
BaseSupportTools.PrintExceptionMessage(e);
}
}
public void CreateConnect()
{
SerialPort serialPort = new SerialPort(portName, 9600, Parity.None, 8, StopBits.One);
int failConnectCount = 0;
try
{
serialPort.Open();
bool isConnect = false;
this.prgConnectStatus.Value = 20;
this.prgConnectStatus.Refresh();//ProgressBar控件立即刷新显示
this.lblConnectStatus.Text = "以9600bps正在尝试连接中。。。";
this.lblConnectStatus.Refresh();//lable控件立即刷新显示
//以9600bps的默认速率进行首次连接
while (!isConnect)
{
isConnect = TryConnect(serialPort);
//间隔1s后重连或进行下一步
System.Threading.Thread.Sleep(1000);
failConnectCount++;
if (failConnectCount > 20)
{
if (MessageBox.Show("Novatel接收机连接失败", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error) == DialogResult.OK)
{
//彻底退出程序
System.Environment.Exit(0);
}
}
}
this.prgConnectStatus.Value = 40;
this.prgConnectStatus.Refresh();//ProgressBar控件立即刷新显示
this.lblConnectStatus.Text = "重置通信波特率为" + baudRate + "bps。。。";
this.lblConnectStatus.Refresh();//lable控件立即刷新显示
//重置通信速率为 baudRate bps
TrySerialConfig(serialPort, baudRate);
serialPort.Close();
this.prgConnectStatus.Value = 60;
this.prgConnectStatus.Refresh();//ProgressBar控件立即刷新显示
this.lblConnectStatus.Text = "重置通信波特率为" + baudRate + "bps成功";
this.lblConnectStatus.Refresh();//lable控件立即刷新显示
System.Threading.Thread.Sleep(1500);
this.prgConnectStatus.Value = 80;
this.prgConnectStatus.Refresh();//ProgressBar控件立即刷新显示
this.lblConnectStatus.Text = "以" + baudRate + "bps正在尝试重新连接中。。。";
this.lblConnectStatus.Refresh();//lable控件立即刷新显示
System.Threading.Thread.Sleep(1000);
//以 baudRate bps的速率进行再次连接
failConnectCount = 0;
serialPort.BaudRate = baudRate;
serialPort.Open();
while (!isConnect)
{
isConnect = TryConnect(serialPort);
//间隔1s后重连或进行下一步
System.Threading.Thread.Sleep(1000);
if (failConnectCount > 5)
{
if (MessageBox.Show("Novatel接收机连接失败", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error) == DialogResult.OK)
{
//彻底退出程序
System.Environment.Exit(0);
}
}
}
//开启GPS、北斗系统和关闭GLONASS系统
serialPort.WriteLine("assignall gps auto");
System.Threading.Thread.Sleep(1000);
serialPort.WriteLine("assignall beidou auto");
System.Threading.Thread.Sleep(1000);
serialPort.WriteLine("assignall glonass idle");
System.Threading.Thread.Sleep(1000);
//发送指令
serialPort.WriteLine("log bestposb ontime 1");
System.Threading.Thread.Sleep(1000);
serialPort.WriteLine("log bestvelb ontime 1");
System.Threading.Thread.Sleep(1000);
serialPort.WriteLine("log ionutcb ontime 1");
System.Threading.Thread.Sleep(1000);
serialPort.WriteLine("log psrdopb ontime 1");
System.Threading.Thread.Sleep(1000);
serialPort.WriteLine("log satvis2b ontime 60");
System.Threading.Thread.Sleep(1000);
serialPort.WriteLine("log rangecmpb ontime 0.2");
System.Threading.Thread.Sleep(1000);
this.prgConnectStatus.Value = 100;
this.prgConnectStatus.Refresh();//ProgressBar控件立即刷新显示
this.lblConnectStatus.Text = "Novatel接收机连接成功！";
this.lblConnectStatus.Refresh();//lable控件立即刷新显示
serialPort.Close();//关闭串口
System.Threading.Thread.Sleep(1000);
this.Close();//关闭串口
}
catch (System.IO.IOException e)
{
BaseSupportTools.PrintExceptionMessage(e);
MessageBox.Show("当前串口已被占用", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error);
//彻底退出程序
System.Environment.Exit(0);
}
}
/// <summary>
/// 尝试以目前的串口设置连接Novatel接收机
/// </summary>
/// <param name="serialPort">串口实例</param>
/// <returns></returns>
private static bool TryConnect(SerialPort serialPort)
{
serialPort.Write("log versionb once");//发送指令
serialPort.Write("\r");
serialPort.Write("\n");
System.Threading.Thread.Sleep(1000);//延迟1s
int bytesCount = serialPort.BytesToRead;
int tempData = 0;
bool isFindHeaderSync1 = false;
bool isFindHeaderSync2 = false;
bool isFindHeaderSync3 = false;
bool isConnect = false;
int headerLength = 0;
int availableByteCount = 0;//有效字节计数
byte[] temp2Bytes = new byte[2];
for (int ix = 0; ix < bytesCount; ix++)
{
tempData = serialPort.ReadByte();
//寻找帧头
if (!isFindHeaderSync1)
{
if (tempData == 0xAA)
{
isFindHeaderSync1 = true;
}
}
else if ((isFindHeaderSync1) && (!isFindHeaderSync2))
{
if (tempData == 0x44)
{
isFindHeaderSync2 = true;
}
}
else if ((isFindHeaderSync1) && (isFindHeaderSync2) && (!isFindHeaderSync3))
{
if (tempData == 0x12)
{
isFindHeaderSync3 = true;
availableByteCount = 3;//帧头3个字节检测成功了
continue;
}
}
//判断帧头是否寻找成功
if ((isFindHeaderSync1) && (isFindHeaderSync2) && (isFindHeaderSync3))
{
if (availableByteCount == 3)
{
headerLength = tempData;
availableByteCount++;
}
else if (availableByteCount == 4)
{
temp2Bytes[0] = (byte)tempData;
availableByteCount++;
}
else if (availableByteCount == 5)
{
temp2Bytes[1] = (byte)tempData;
int messageId = BitConverter.ToInt16(temp2Bytes, 0);
if (messageId == 37)//即VERSION
{
isConnect = true;//连接成功
}
availableByteCount++;
}
}
}
return isConnect;
}
/// <summary>
/// 尝试重置Novatel接收机的波特率
/// </summary>
/// <param name="serialPort">串口实例</param>
/// <param name="baudRate">重置后的波特率</param>
/// <returns></returns>
private static bool TrySerialConfig(SerialPort serialPort, int baudRate)
{
bool isSerialConfig = false;
string command = "serialconfig com1 " + baudRate + " n 8 1 n on";
serialPort.Write(command);//发送指令
serialPort.Write("\r");
serialPort.Write("\n");
System.Threading.Thread.Sleep(1000);//延迟1s
bool isSendSuccess1 = false;
bool isSendSuccess2 = false;
bool isSendSuccess3 = false;
int bytesCount = serialPort.BytesToRead;
int tempData = 0;
for (int ix = 0; ix < bytesCount; ix++)
{
tempData = serialPort.ReadByte();
if (!isSendSuccess1)
{
//寻找'<'
if (tempData == 0x3C)
{
isSendSuccess1 = true;
}
}
else if ((isSendSuccess1) && (!isSendSuccess2))
{
//寻找'O'
if (tempData == 0x4F)
{
isSendSuccess2 = true;
}
}
else if ((isSendSuccess1) && (isSendSuccess2) && (!isSendSuccess3))
{
//寻找'K'
if (tempData == 0x4B)
{
isSendSuccess3 = true;
}
}
//判断“<OK”是否寻找成功
if ((isSendSuccess1) && (isSendSuccess2) && (isSendSuccess3))
{
isSerialConfig = true;
}
}
return isSerialConfig;
}
}
}
扫了一下代码，估计是串口对象SerialPort 在上一次连接后，没有正常关闭(测试：如果第一次连接成功，再次连接不成功能，尝试退出进程，再看是否连接成功来判断 是否属于该问题, 并不代表退出后，二运行后能连接上就是这个问题), 把SerialPort serialPort 1.对象做成全局对象，2.每执行一个动作，打印对象状态, 通过这种方式打到出问题的地方(建议你先把try去掉) , 第二种可能 上次一连接没有正常关闭（串口连接被独占了），这个时候再连接变会失败， csdn查一下SerialPort 说明，看看对象丢失后，是否为自动close(我觉得不会), 最好写个测试：不停进行open->close 操作，open-> wirt byte->close ，看看硬件是否有问题
套接字使用的端口是不是在你的机器上被占用了，你换个端口试试