下面的代码示例演示了如何使用
SerialPort
类来允许两个用户从两台由 null 调制解调器电缆连接的单独计算机聊天。 在此示例中，系统会在聊天之前提示用户输入端口设置和用户名。 此代码示例是为 类提供的更大代码示例的
SerialPort
一部分。
public:
static void Main()
String^ name;
String^ message;
StringComparer^ stringComparer = StringComparer::OrdinalIgnoreCase;
Thread^ readThread = gcnew Thread(gcnew ThreadStart(PortChat::Read));
// Create a new SerialPort object with default settings.
_serialPort = gcnew SerialPort();
// Allow the user to set the appropriate properties.
_serialPort->PortName = SetPortName(_serialPort->PortName);
_serialPort->BaudRate = SetPortBaudRate(_serialPort->BaudRate);
_serialPort->Parity = SetPortParity(_serialPort->Parity);
_serialPort->DataBits = SetPortDataBits(_serialPort->DataBits);
_serialPort->StopBits = SetPortStopBits(_serialPort->StopBits);
_serialPort->Handshake = SetPortHandshake(_serialPort->Handshake);
// Set the read/write timeouts
_serialPort->ReadTimeout = 500;
_serialPort->WriteTimeout = 500;
_serialPort->Open();
_continue = true;
readThread->Start();
Console::Write("Name: ");
name = Console::ReadLine();
Console::WriteLine("Type QUIT to exit");
while (_continue)
message = Console::ReadLine();
if (stringComparer->Equals("quit", message))
_continue = false;
_serialPort->WriteLine(
String::Format("<{0}>: {1}", name, message) );
readThread->Join();
_serialPort->Close();
static void Read()
while (_continue)
String^ message = _serialPort->ReadLine();
Console::WriteLine(message);
catch (TimeoutException ^) { }
public static void Main()
string name;
string message;
StringComparer stringComparer = StringComparer.OrdinalIgnoreCase;
Thread readThread = new Thread(Read);
// Create a new SerialPort object with default settings.
_serialPort = new SerialPort();
// Allow the user to set the appropriate properties.
_serialPort.PortName = SetPortName(_serialPort.PortName);
_serialPort.BaudRate = SetPortBaudRate(_serialPort.BaudRate);
_serialPort.Parity = SetPortParity(_serialPort.Parity);
_serialPort.DataBits = SetPortDataBits(_serialPort.DataBits);
_serialPort.StopBits = SetPortStopBits(_serialPort.StopBits);
_serialPort.Handshake = SetPortHandshake(_serialPort.Handshake);
// Set the read/write timeouts
_serialPort.ReadTimeout = 500;
_serialPort.WriteTimeout = 500;
_serialPort.Open();
_continue = true;
readThread.Start();
Console.Write("Name: ");
name = Console.ReadLine();
Console.WriteLine("Type QUIT to exit");
while (_continue)
message = Console.ReadLine();
if (stringComparer.Equals("quit", message))
_continue = false;
_serialPort.WriteLine(
String.Format("<{0}>: {1}", name, message));
readThread.Join();
_serialPort.Close();
public static void Read()
while (_continue)
string message = _serialPort.ReadLine();
Console.WriteLine(message);
catch (TimeoutException) { }
Public Shared Sub Main()
Dim name As String
Dim message As String
Dim stringComparer__1 As StringComparer = StringComparer.OrdinalIgnoreCase
Dim readThread As New Thread(AddressOf Read)
' Create a new SerialPort object with default settings.
_serialPort = New SerialPort()
' Allow the user to set the appropriate properties.
_serialPort.PortName = SetPortName(_serialPort.PortName)
_serialPort.BaudRate = SetPortBaudRate(_serialPort.BaudRate)
_serialPort.Parity = SetPortParity(_serialPort.Parity)
_serialPort.DataBits = SetPortDataBits(_serialPort.DataBits)
_serialPort.StopBits = SetPortStopBits(_serialPort.StopBits)
_serialPort.Handshake = SetPortHandshake(_serialPort.Handshake)
' Set the read/write timeouts
_serialPort.ReadTimeout = 500
_serialPort.WriteTimeout = 500
_serialPort.Open()
_continue = True
readThread.Start()
Console.Write("Name: ")
name = Console.ReadLine()
Console.WriteLine("Type QUIT to exit")
While _continue
message = Console.ReadLine()
If stringComparer__1.Equals("quit", message) Then
_continue = False
_serialPort.WriteLine([String].Format("<{0}>: {1}", name, message))
End If
End While
readThread.Join()
_serialPort.Close()
End Sub
Public Shared Sub Read()
While _continue
Dim message As String = _serialPort.ReadLine()
Console.WriteLine(message)
Catch generatedExceptionName As TimeoutException
End Try
End While
End Sub
每个
SerialPort
对象只能存在一个打开的连接。
对于任何应用程序，最佳做法是在调用
Close
方法后等待一段时间，然后再尝试调用
Open
方法，因为端口可能不会立即关闭。
