Trying to read bytes, keep getting "?" (ascii 63)

[guiglass]

If I send the byte 128 (or anything higher) followed by a newline then I read that into Unity like so:

string message = serialController.ReadSerialMessage ();
print(message[0]);

Outputs: "?" (or ascii 63).

This is just wrong!

[guiglass]

Well, I created a solution... Turns out it was to do with serialPort.ReadLine() and the way it converts to string. Not sure why it was adding question marks (completely ridiculous actually). But what I threw together reads in a line of bytes directly instead of using Readline()

SerialThreadLines.cs

    /*OLD WAY
    protected override object ReadFromWire(SerialPort serialPort)
    {
        return serialPort.ReadLine();
    }
    */

    /*NEW WAY*/
    private List<byte> buffer = new List<byte>();
    protected override object ReadFromWire(SerialPort serialPort)
    {
        buffer.Add( (byte)serialPort.ReadByte() );

        // Search for the separator in the buffer
        int index = System.Array.FindIndex<byte>(buffer.ToArray(), 0, buffer.Count, IsSeparator);
        if (index == -1)
            return null;

        buffer.RemoveAt (buffer.Count - 1); //remove CR
	buffer.RemoveAt (buffer.Count - 1); //remove LF

        var output = buffer.ToArray ();
        buffer.Clear ();

        return output;
    }

    private bool IsSeparator(byte aByte)
    {
        return aByte == '\n';
    }

Above could really use some optimization but it's simply conceptual.

[dwilches]

Attempting to print an unprintable character (like 128) can yield weird outputs (because they are unprintable). Normally what you do with those characters is to print their ASCII value, not the character itself.