Getting error only first time I communicate with my SerialPort later on its working fine.

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Hello friends

• I have one USB device (e.g. barcode scanner etc.)
• I communicating with it using SerialPort (which is found nicely from toolbox of VS2008)

My problem is,

After starting my PC when I starting my Application first time….
My application hanging up or stuck up or going in to Not Responding Mode
when it tries to sending string to serial port……..
To come out of it ……..
I just remove the USB cable from USB port of my PC….

As soon as I remove cable I getting error message……

I pressing Continue button…and plug-in back Removed USB cable…..
Now my application working fine………

NOTE: I am getting this error only start my app First time after starting my PC.
After that how many times I start or close my app I does not getting any error...

NOTE: another thing to consider is that …… if I put my code in try and catch
I catch exception only when I remove the USB cable from my PC.

It seems to me that control is going inside infinite loop when sending string to serial port
See the detail of my code over here

EDIT:
NOTE:
After restart my PC......if I do
1.pulg-out and plug-in USB cable from USB Port Of PC, and then
2. I start my App then its working fine

Thanks…..

Posted 26-May-11 20:22pm

Pritesh Aryan

Updated 26-May-11 21:24pm

v10

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Ruard · Answer 1 · 2011-05-26T20:51:00

Solution 1

I don't know if this is really going to help but you can clear the buffers after connecting:

SerialPort.DiscardOutBuffer()
SerialPort.DiscardInBuffer()

and add some delay (like Sleep(100);) between

mySerialPortObj.SendFunc("{3QFG}");

and

string receivedString = mySerialPortObj.ReadFunc();

Perhaps there is a delay in sending the response (the first time) and is that what is causing your application to hang.

Posted 26-May-11 20:51pm

Ruard

Comments

Pritesh Aryan 27-May-11 3:16am

after trying your code.........
it seems to me that this problem is from USB device to which i communicate...........
after restart my PC......I do
1.pulg-out and plug-in USB cable from USB Port Of PC, and then
2. I start my App then its working fine

Thanks for replying.....