[Tutor] Pyserial and invalid handle

[Emile van Sebille]

On 11/29/2010 1:44 PM John Smith said...
> But, when I tried it in Python, I got the same as before:
>
>
>  >>> import serial
>  >>> ser = serial.Serial(0, timeout = 1)

out of curiosity, if you change the timeout above to 5....

>  >>> ser
> Serial<id=0x225c240, open=True>(port='COM1', baudrate=9600, bytesize=8,
> parity='N', stopbits=1, timeout=1, xonxoff=False, rtscts=False,
> dsrdtr=False)
>  >>> ser.read()

... does the delay before printing the traceback below take about 5 seconds?

>
> Traceback (most recent call last):
> File "<pyshell#3>", line 1, in <module>
> ser.read()
> File "E:\Python27\lib\site-packages\serial\serialwin32.py", line 236, in
> read
> raise SerialException("ReadFile failed (%s)" % ctypes.WinError())
> SerialException: ReadFile failed ([Error 6] The handle is invalid.)
>  >>>


Emile