如何在c#中读取字节

时间:2011-12-19 06:55:44

标签: c# multithreading bluetooth serial-port

我正在尝试处理我的传入缓冲区,并确保在每次传输时获得所有125字节的数据。我创建了一个字节数组。我怎么知道正在接收125字节的数据。我尝试显示字节数,但它显示不同的数字,我不确定它是否是正确的编码,以获得接收的字节数。

这是我的代码:

void datareceived(object sender, SerialDataReceivedEventArgs e)
{
    myDelegate d = new myDelegate(update);
    listBox1.Invoke(d, new object[] { });
}


public void update()
{
    Console.WriteLine("Number of bytes:" + serialPort.BytesToRead); // it shows 155

    while (serialPort.BytesToRead > 0)
        bBuffer.Add((byte)serialPort.ReadByte());         
    ProcessBuffer(bBuffer);
}

private void ProcessBuffer(List<byte> bBuffer)
{
    // Create a byte array buffer to hold the incoming data
    byte[] buffer = bBuffer.ToArray();

    // Show the user the incoming data // Display mode
    for (int i = 0; i < buffer.Length; i++)
    {
        listBox1.Items.Add("SP: " + (bBuffer[43].ToString()) + "  " + " HR: " + (bBuffer[103].ToString()) + " Time: ");              
    }
}

1 个答案:

答案 0 :(得分:7)

当你正在阅读,直到本地接收缓冲区BytesToRead)为空时,更好的方法是保持缓冲区和偏移量,并循环直到你有<强>你需要什么,即使这意味着等待 - 即

byte[] buffer = new byte[125]
int offset = 0, toRead = 125;

...

int read;
while(toRead > 0 && (read = serialPort.Read(buffer, offset, toRead)) > 0) {
    offset += read;
    toRead -= read;
}
if(toRead > 0) throw new EndOfStreamException();
// you now have all the data you requested