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#1
July 30th, 2004, 02:47 PM
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Help! My serial IO exception handler not working
I am trying to use the following code to enable me to catch when another program is using the serial port, and pop-up a standard error window:
Code:
def OpenSerial():
global ser
try:
ser = serial.Serial()
except:
tkMessageBox.showerror("Serial Port Error", "Could not get serial port")
else:
if ser.isOpen():
ser.close()
ser.baudrate = 9600
ser.port = 'COM1'
ser.open()
ser.setDTR()
#self.StartThread()
tkMessageBox.showinfo("Serial Port Status","COM on %s [%s, %s%s%s%s%s]" % (
ser.portstr,
ser.baudrate,
ser.bytesize,
ser.parity,
ser.stopbits,
ser.rtscts and ' RTS/CTS' or '',
ser.xonxoff and ' Xon/Xoff' or '',
)
)
The part showing a succesfully opened COM port works like I want it to (the "else" portion). Anyone have any ideas as to what I'm doing wrong? I am using Python 2.3 and Pyserial 2.1
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#2
August 9th, 2004, 03:57 AM
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You will only get an exception when you try to open/read/write the port.
Until you attempt to grab the port with the open method the serial module cannot know which port you will be communicationg with. grim 
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