How to create a virtual com port using C#

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How to create a virtual Com port using C# (without using third party tools) for connecting a hand scanner without connecting with the original device. Please do help me with your valid inputs. Hope any one of you would have tried this before. Hence seeking your help.

What I have tried:

I don't have any idea to proceed further for this virtual com port simulator.

Posted 24-Aug-16 19:34pm

Ravi Chandran

Updated 8-Dec-20 22:07pm

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OriginalGriff · Answer 1 · 2016-08-24T20:33:00

Basically, you can't - not in practice. What you need to create is a device driver which pretends to be a com port, and those aren't simple, not at all.
If you want this to test your software, then I'd strongly suggest that you do go third party, or, use a second port on your machine via a "null modem cable" to provide the device emulation.
For third party: com0com[^] seems popular, but I haven't used it myself.
For cable: Testing Serial Application with Virtual Ports[^]

Bernhard Hiller · Answer 2 · 2016-08-24T21:51:00

What do you need to simulate? The communication with an external device which is not present during the tests?
- First find out which functions and properties of SerialPort you really need (in our case, we just needed a few of them).
- Create an interface defining them.
- Create a wrapper for the "real" port which implements your interface. That will be the instance used in production.
- Make your other code depend on your interface instead of the "real" port.
- Create a dummy port which implements your interface, and add the logic for emulating the device. That's the instance used for testing.
- You may create further dummies which simulate communication problems - now you can test that your code copes with that, too.

How to create a virtual com port using C#

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