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Hi guys, I've searched in the forum thread for my needs, and I couldn't find any. So here is my problem. I need to monitor the data passing trough serial communication, between local serial port and some device with an application written in vb.net The idea is to see the data without opening the port. For example I want to start the program, choose the serial port that I want to monitor, and then to start some other application that opens the serial port, and start to send data. Another device 'answers', and I want to see the the sent and received data from the first program, and the process that opens the port. I thought that I can use the serial port event 'DataReceived', but actually nothing happens.
I think my approach is wrong. Can someone give me some directions. Here is my code: Imports System.IO Public Class Form2 Private WithEvents sp As Ports.SerialPort Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click sp = New Ports.SerialPort('COM2', 9600, Ports.Parity.None, 8, Ports.StopBits.One) End Sub Private Sub dr() Handles sp.DataReceived TextBox2.Text = sp.ReadExisting End Sub Best Regards, Julian. Lite On Lvw 1105 Manual Lymphatic Drainage.
From information I've read for the serial ports 'Sharing access is out of the question, Windows won't allow it and it fundamentally cannot work'. Apparently if an application is using the serial port the serial port is blocked until the application releases the serial port. Although I've seen mention of third party software which can do this and according to what I've read it is because they use kernel mode drivers (whatever those are) in order to monitor a serial port in use by an application. You may want to read this thread You've taught me everything I know but not everything you know. This requires a specialized serial port driver. My personal preferece for this is Advanced Serial Port Monitor:. It is not free, but is a very professional program.
You could use it to pass data to an external VB program, though it isn't designed for that purpose. Give it a try via the demo version to see if it meets your needs. There are a couple of other, somewhat similar, programs, though ASPM is the one that I use. Dick Dick Grier.
Author of Visual Basic Programmer's Guide to Serial Communications 4. See www.hardandsoftware.net. 'I do not want to use the port, I just want somehow to read its received buffer. If it is possible, I do not know how to do it. Dark Side Of The Moon Pink Floyd Zippo. ' If you only need to read the received data your computers application is receiving you could use a jumper from the receive pin of serial port A for example to a receive only null modem on serial port B for example and monitor serial port B with your monitor program. If you had an extra serial port available that is.
If you want to monitor both your computer applications transmit data and receive data and 'see' the process that opens the port your computer application is using I am unaware of how you would do that without purchasing third party software. After all Dick Grier (Author of Visual Basic Programmer's Guide to Serial Communications) replied to you and I'm sure he would, if anybody would, know how to do what you are trying to do. You've taught me everything I know but not everything you know.