Create virtual serial port vb.net

But there are still some tricks that makes it possible to open and use the com port. First of all, windows , windows xp and windows have protected hardware access. This is the HAL. Very useful when it comes to security, but for programmers like me it's a nightmare.

I found a solution: Let windows do the job for you. I simply told windows to do the hardware controlling for me. I will trick my program that the com port is a file. The first function of my code is the open function. The function will be trying to make a com port handle. After that I check if the handle is correct.

With this structure we can control all comport settings. I will only use, speed, parity, stop bits and data bits. The next function is the Write Function.

This function controls the writing to the com port. I choose to write one byte at a time to the com port since I wanted to control a microcontroller with my com port. But you can change this of course to a multi-byte write function or add an extra function for multi-byte. At last and more important than the open function we have the Close function. This function closes the com port and releases the system handle to it.

I hope my english wasn't too bad and my explaination not too chaotic. But above all, I hope you have fun with my com port driver! Sign in Email. Forgot your password? Search within: Articles Quick Answers Messages.

Tagged as. Stats COM port made simple with VB. WillemM Rate me:. Please Sign up or sign in to vote. Using the com port in windows, using any. NET Language. Download source files - 6 Kb Introduction This article is about controlling the com port in windows. How did I make this? The code The first function of my code is the open function.

I will only use, speed, parity, stop bits and data bits VB. Sleep 0 My. PortData Label2. FormClosing Try If port.

IsOpen Then port. Close Finally port. Thread AddressOf readPort rdthread. KalaNag KalaNag 3 3 silver badges 14 14 bronze badges. Add a comment. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. This topic describes how to use My. Ports to receive strings from the computer's serial ports in Visual Basic. Determine which serial port should provide the strings. This example assumes it is COM1.

Use the My. OpenSerialPort method to obtain a reference to the port. For more information, see OpenSerialPort. The Try Finally block allows the application to close the serial port even if it generates an exception. Do While pinserrorsThrd. ThreadState And Threading. Unstarted OrElse. Reset 'not running. Set 'protocol first. IsOpen Then. If isAppEnd Then 'is the application ending. Dispose 'protocol last. SerialPortClose True. BeginInvoke Sub.

Close 'fire close again. Public Function isComplete As Boolean. Return Me. End Function. Public Function isValid As Boolean. Dim idxNeedle As Integer. Enter someDataLock. IndexOf needle. Exit someDataLock. Return idxNeedle. GetRange 0, idxNeedle. Return rv. If someData. GetRange 0, count. GetRange 0, someData. RemoveRange 0, someData.

If getBytes Then. End Class. Inherits PDUCommon. Lf 'linefeed. GetEncoding Private Class ComplexDeviceProto 'sample. Enter someDataLock 'lock. Do While someData. If oneTime Then. ToArray 'get it. Exit someDataLock 'unlock.

Dim crc As Integer. ToInt32 PDU, 1. If Threading. FlushBuffer someData, someDataLock. If addThese. If UIstpw. If Not dispPaused Then. TotalSeconds, bps, MaxDepth. Maximum Then. Static t As Task. If t Is Nothing Then. Run Sub. WriteLine "". Dim ctrlType As Type. Dim pi As Reflection. GetProperty "DoubleBuffered" , Reflection. Instance Or Reflection. SetValue aControl, True , Nothing. Private Shared prng As New Random. Private minMessSz As Integer. Four score and seven years ago