C# COM regfree sample: C++ server works, C# server not! Why?

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Hello - I give up!

I would like to use a reg free COM component in my App. I looked for a sample program and found GitHub - AaronRobinsonMSFT/COMInterop: Example on how to consume a COM server from a .NET client and a .NET server from a COM client. Examples are for both using the Registry and for RegFree.[^] [^]

The sample contains a C++ COM server, as well a C# COM server. The C++ version works perfectly, but the C# version throws an exception System.InvalidCastException at instantiation

C#

var server = new Server()

.

I provide 2 ready-to-run projects at Dropbox - COMRegFree Sample.zip[^] . Just press F5 in visual studio. Can anybody tell me what is wrong or missing??

Thanks

What I have tried:

Downloaded the sample and tryed to get run.

Posted 23-May-24 0:04am

Michael Sabo

Updated 26-May-24 21:43pm

v3

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0x01AA 24-May-24 10:03am

In other words: You can't start a regfree c# com server from a c# application?

Richard MacCutchan 25-May-24 4:54am

You should ask the person who wrote the code.

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Pete O'Hanlon · Answer 1 · 2024-05-25T07:01:00

Solution 1

You don't provide much information other than a link to a github repo and a random Dropbox link that people are unlikely to follow.

An invalid cast happens when you attempt to cast a type to another, unsupported type. Presumably, somewhere in the Server construction call, you have a type that is being cast. You will need to set breakpoints to find the code that is the culprit.

Posted 25-May-24 7:01am

Pete O'Hanlon

Comments

Michael Sabo 27-May-24 3:40am

That's right. I intentionally kept the description short and sweet. A long story tires the reader. I would like to have the attachment attached to the ticket. Unfortunately, this is probably not possible here.

Dave Kreskowiak 27-May-24 10:53am

The quality of the answers you get is directly dictated by the quality of the questions you ask.

And no, you cannot attach files here, for good reason. You can, however, paste in the relevant code.

Michael Sabo 27-May-24 11:00am

Do you have already analysed the code?

Dave Kreskowiak 27-May-24 11:35am

I'm not downloading code from an untrusted site/user. I don't have virus problems on my machines and prefer to keep it that way.

Michael Sabo 28-May-24 3:07am

Exactly! These are the bad creatures that are just waiting in text files for to destroy the computer. *lol*

Dave Kreskowiak 28-May-24 9:02am

You must have missed the part where I said I don't trust YOU, and that includes the code you wrote into those little text files.

Don't feel bad about that. Not trusting anyone and anything they do is what I get paid to do.

Pete O'Hanlon 27-May-24 14:11pm

Have you attached a debugger and attempted to run it yet? Have you read the full text of the error message to see if it gives you hints?