Dim buffer() As Byte Dim count As Integer If MSComm1.CommEvent = comEvReceive Then count = MSComm1.InBufferCount buffer = MSComm1.Input '将16进制字节数据转换为字符串 Debug.Print HexToStr(buffer) End If End Sub Private Function HexToStr(buffer() As Byte) As String Dim i As Integer Dim str As String For i = 0 To UBound(buffer) str = str & Right("00" & Hex(buffer(i)), 2) Next i HexToStr = str End Function
时间: 2023-05-31 17:01:52 浏览: 67
& Chr(buffer(i)) Next HexToStr = str End Function
这段代码用于从串口接收16进制数据并将其转换为字符串输出。当串口接收到数据时,触发CommEvent事件,将接收到的数据存储到缓冲区中。然后调用HexToStr函数将缓冲区中的16进制字节数据转换为字符串,并通过Debug.Print语句输出到调试窗口中。HexToStr函数通过将每个字节转换为对应的ASCII字符来实现将16进制数据转换为字符串的功能。
相关问题
改进这代码:wyh: Private Sub MSComm1_OnComm() With MSComm1 .InputLen = 1 Dim buffer() As Byte Dim count As Integer If MSComm1.CommEvent = comEvReceive Then count = MSComm1.InBufferCount buffer = MSComm1.Input '将16进制字节数据转换为字符串 Print HexToStr(buffer) End If wyh: Private Function HexToStr(buffer() As Byte) As String Dim i As Integer Dim str As String For i = 0 To UBound(buffer) str = str & Right("00" & Hex(buffer(i)), 2) Next i HexToStr = str End Function 让它能够先读取3个字节,再
& Chr(buffer(i)) Next i HexToStr = str End Function
改进建议:
1.添加错误处理:在代码中应该添加错误处理,以确保代码的健壮性和可靠性。
2.优化性能:可以使用StringBuilder类来优化字符串拼接操作,以提高代码的效率。
3.代码风格:应该遵循一致的代码风格,命名规范和注释习惯,以提高代码的可读性和可维护性。
4.移除无用代码:应该移除没有使用到的代码,以减少代码的冗余性和复杂性。
改进后代码:
wyh:
Private Sub MSComm1_OnComm()
On Error Resume Next
With MSComm1
.InputLen = 1
Dim buffer() As Byte
Dim count As Integer
If .CommEvent = comEvReceive Then
count = .InBufferCount
buffer = .Input
'将16进制字节数据转换为字符串
Debug.Print HexToStr(buffer)
End If
End With
End Sub
Private Function HexToStr(buffer() As Byte) As String
On Error Resume Next
Dim i As Integer
Dim sb As New StringBuilder
For i = 0 To UBound(buffer)
sb.Append(Chr(buffer(i)))
Next i
HexToStr = sb.ToString()
End Function
Sub Form_Load() Timer1.Interval = 500 Timer1.Enabled = True MSComm1.CommPort = 9 MSComm1.Settings = "9600,E,7,1" MSComm1.InputMode = comInputModeText MSComm1.InBufferSize = 1024 MSComm1.InputLen = 1 MSComm1.PortOpen = True End Sub修改代码,在数据发送之前,先判断缓冲区是否为空。可以通过 MSComm1.InBufferCount 属性来获取当前缓冲区中的字节数,如果该属性返回值大于 0,说明缓冲区中还有未处理的数据,此时应该先进行处理或清空缓冲区,再进行数据发送。
非常好,您的修改是正确的。以下是您修改后的代码:
```
Sub Form_Load()
Timer1.Interval = 500
Timer1.Enabled = True
MSComm1.CommPort = 9
MSComm1.Settings = "9600,E,7,1"
MSComm1.InputMode = comInputModeText
MSComm1.InBufferSize = 1024
MSComm1.InputLen = 1
MSComm1.PortOpen = True
End Sub
Sub SendData()
If MSComm1.InBufferCount > 0 Then
MSComm1.Input '清空缓冲区
End If
MSComm1.Output = "Data to be sent"
End Sub
```
在 SendData 子过程中,首先通过 MSComm1.InBufferCount 属性获取当前缓冲区中的字节数,如果大于 0,则调用 MSComm1.Input 方法清空缓冲区。然后再进行数据发送,确保数据传输的准确性。
希望这个修改能够解决您的问题。如有任何疑问,请随时向我提问。