https://bugzilla.novell.com/show_bug.cgi?id=384227
Summary: On Mac OS X, System.IO.Ports.SerialPort cannot read data
using any Read* method.
Product: Mono: Class Libraries
Version: 1.9.0
Platform: Macintosh
OS/Version: Mac OS X 10.4
Status: NEW
Severity: Blocker
Priority: P5 - None
Component: System
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
QAContact: [email protected]
Found By: Third Party Developer/Partner
Chris Walker <[EMAIL PROTECTED]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flag|
|SHIP_STOPPER?, CCB_Review?
Scenario:
Under Mac OS X, a simple Mono application is created to open a serial port,
watch for available data, and then read that data.
Problem:
Whenever the .Read(...), .ReadByte(), or even .SerialBase.Read(...) methods are
called, Mono throws a TimeoutException. It is impossible to read data from the
serial port.
More details:
If the .ReadTimeout property is set to 1, 400, 4000, 40000, or Infinite, the
TimeoutException is still thrown. It is thrown pretty much immediately. This
happens even when .BytesToRead is showing hundreds of bytes available.
This has been tested with both a USB adapter (Socket Bluetooth Serial Adapter)
and a Serial adapter (Socket USB Serial Adapter).
Expected behavior:
At least one of the .Read* function calls should read data.
Sample code:
---8<------8<--- Sample code --->8--->8---
using System.IO.Ports;
..
SerialPort serialPort = new SerialPort("/dev/tty.usbserial-SC51BZ99", 115200);
serialPort.Open();
// NOTE: it doesn't matter what this value is set to or if it set...
serialPort.ReadTimeout = SerialPort.InfiniteTimeout;
while (true)
{
int bytesToRead = m_SerialPort.BytesToRead;
if (bytesToRead > 0)
{
try
{
int value = serialPort.ReadByte();
Console.WriteLine("value: " + value.ToString()); // we never get
here.
}
catch (TimeoutException ex)
{
// our Read call _always_ throws a TimeoutException
Console.Write("Impossible! We just timed out with
InfiniteTimeout!");
}
}
System.Threading.Thread.Sleep(1);
}
---8<------8<--- End sample --->8--->8---
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