从串行端口的ReadLine锁定了 [英] Readline from Serial Port locks up

问题描述

我试图从规模RS232接口读取数据。它会通过它我遇到麻烦串行端口一个连续的ASCII字符串流。我只是想获得它发送一个数据线。我猜我猜我会使用输入行来获取数据，但它只是锁定了电脑，当我运行它。我认为这是试图让所有的数据并不会停止，直到数据停止？下面是我使用的代码：

I am trying to read data from a scale RS232 interface. It sends a continuous ASCII string stream through the Serial Port which I am having trouble getting. I just want to get one line of the data that it is sending out. I guess I assumed that I would use Readline to get the data, but it just locks up the PC when I run it. I think it is trying to get all of the data and won't stop until the data stops? Here is the code I'm using:

private void button1_Click(object sender, EventArgs e)
    {
        serialPort1.PortName = "COM4";
        serialPort1.BaudRate = 9600;
        serialPort1.DataBits = 8;
        serialPort1.Parity = Parity.None;
        serialPort1.StopBits = StopBits.One;

        //opening the serial port
        serialPort1.Open();

        string str = serialPort1.ReadLine();

        MessageBox.Show(str);

        serialPort1.Close();

    }

您可以帮我确定如何得到的只是一条线输出数据和关闭连接？

Can you help me to determine how to get just one line of the output data and close the connection?

推荐答案

的 SerialPort.ReadLine 被定义为块到一个新行值的第一次出现，其中的 NEWLINE 默认为换行。难道你发送的流中的换行？需要注意的是换行符（ASCII 0x0A的）是不同的，一个回车（ASCII码0X0D），你可能会被发送。

SerialPort.ReadLine is defined to block "up to the first occurrence of a NewLine value", where NewLine defaults to a line feed. Are you sending a linefeed in your stream? Note that a linefeed character (ASCII 0x0A) is different that a carriage return (ASCII 0x0D) that you might be sending.

如果需要，您可以重新换行，或者如果一条线的结局感觉不对，你可以阅读到给定的字符串的 SerialPort.ReadTo 。您还可以设置读取超时

You can redefine the NewLine if needed, or if a line ending doesn't feel right, you can read up to a given string with SerialPort.ReadTo. You can also set a read timeout.

您可能更愿意从端口读取的字节给定数量，而不是一条线，用的 SerialPort.Read 重载。

You might prefer to read a given number of bytes from the port, rather than a line, with one of the SerialPort.Read overloads.

如果这一切都不适用，请确保你实际上发送，你觉得你的数据 - 打开超级终端/ TeraTerm /你最喜欢的串行终端，使用相同的串行端口设置将其配置为你上面使用，确保你看你希望看到的数据。

If none of this applies, make sure that you're actually sending data where you think you are - bring up HyperTerminal/TeraTerm/your favorite serial terminal, configure it with the same serial port settings as you've used above, and make sure you see the data you expect to see.

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