vb.net Serialport readbyte 没有得到正确的数据
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Serialport readbyte not getting the right data
提问by dxtr
I'm writing a software in VB.net to communicate with an external device with modbus
I have a problem while reading data received from the device , to put it in example , using sp1.ReadByte()the data sent from the device is this :
我正在 VB.net 中编写一个软件来与带有 modbus 的外部设备通信我在读取从设备接收到的数据时遇到问题，举个例子，使用sp1.ReadByte()从设备发送的数据是这样的：
05-03-04-00-00-01-9F-FE-0B
Update : to read data i used this code
更新：为了读取数据，我使用了这段代码
Dim reponse As Byte() = New Byte(5 + (2 * nombre_registrre - 1)) {}
For i As Integer = 0 To response.Length - 1
response(i) = CByte(genvision.sp1.ReadByte())
Next
but receive this
但收到这个
05-03-04-01-9F-FE-0B
I want to read it byte by byte even those 00 00 ,
我想逐字节读取它，即使是那些 00 00 ，
Thank you so much for your help
非常感谢你的帮助
采纳答案by dxtr
Problem solved , The problem was : sp1.DiscardNull = true ,
问题解决了，问题是： sp1.DiscardNull = true ，
https://msdn.microsoft.com/en-us/library/system.io.ports.serialport.discardnull(v=vs.110).aspx
https://msdn.microsoft.com/en-us/library/system.io.ports.serialport.discardnull(v=vs.110).aspx
thank you so much for your help
非常感谢你的帮助
回答by chouaib
Try :
尝试 ：
private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
byte[] array = new byte[256];
int i = 0;
while (serialPort1.BytesToRead > 0)
{
array[i]=serialPort1.ReadByte();
i++;
}
}
EDITSorry I was driven here by the C#tag! you have to be more exact next times, P.S I'm not sure how to make it in VB but it shouldn't be much different
编辑对不起，我是被C#标签驱赶到这里的！下次你必须更准确，PS 我不知道如何在 VB 中制作它，但它不应该有太大不同
