Question

我正在编写一个与微控制器通信的Windows窗体。加载winform后，它应自动检测微控制器连接的位置。

我在做的是：

       - Get the names of the available ports 
       - with a loop through these names :
       - assign the port name to the serial port instance in the form
       - send a command for the detection
       - wait some time 
       - check if some text has been received
       - compare the received message to the identification message 
       - if it is the right one break the loop and return the result, if not 
            continue

以下是该功能的代码。我正在使用 thread.sleep 方法。但是这个功能不起作用，当它在那里时我没有检测到它。

你能告诉我这个功能有什么问题吗？时间延迟会阻止接收吗？我应该如何改善它？

加载表单后，此函数在开头处于执行状态。如果我找不到端口，那么任何事情都无法继续。另一方面，在执行的那个阶段我没有其他线索需要考虑。我考虑过 DatarRceived 事件，但在此阶段没有意义，它会在检测到正确的端口后激活。请让我知道你的想法

谢谢

Public Function connect(testport As SerialPort, recognizeText As String, userCommand As String) As Boolean
    Dim intReturnASCII As Integer = 0
    Dim charReturnValue = Chr(intReturnASCII)
    Dim returnMessage As String = ""
    Dim count As Integer = 0

    Dim ports As String() = IO.Ports.SerialPort.GetPortNames
    If testport.IsOpen Then
        testport.Close()
    End If
    Try
        For Each newport As String In ports
            testport.PortName = newport

            testport.Open()
            testport.Write(STX & userCommand & ETX)
            Thread.Sleep(200) ' stop the userform and wait for the reception of the response 
            count = testport.BytesToRead
            While count > 0
                intReturnASCII = testport.ReadByte
                returnMessage = returnMessage + Convert.ToChar(intReturnASCII)
                count -= 1
            End While

            testport.Close()
            XMCPort = newport ' Danach instantiate the serial port publicly with port name , is true instantiate 

            If returnMessage.Contains(recognizeText) Then
                Return True
            End If
        Next
        Return False
    Catch ex As Exception
        Return False
    End Try
    count = 0
    returnMessage = ""
End Function

如何在winform中以编程方式检测/识别串行端口？

0 个答案: