C

C#•2y ago

jborean

✅ COM + NativeAOT Help

I'm fairly new to COM and I'm trying to implement an RDP Dynamic Virtual Channel client dll which uses the IWTSPluginIWTSPlugin COM interface https://learn.microsoft.com/en-us/windows/win32/api/tsvirtualchannels/nn-tsvirtualchannels-iwtsplugin. Can anyone point out what I might be doing wrong here https://gist.github.com/jborean93/394592c89fc8bfd54990d814a29b924f as this just crashes my process and the WTSPlugin-log.txtWTSPlugin-log.txt is never created.

I'm not 100% confident on how I'm setting the COM pointer on the VirtualChannelGetInstanceVirtualChannelGetInstance implementation but I know for sure that mstscmstsc is calling that particular method it as the logs are showing that it is called and the process crashes because I am doing something dumb.

I do have a few other questions that hopefully someone might be able to clarify

• Do I need to save the WTSPluginWTSPlugin and StrategyBasedComWrappersStrategyBasedComWrappers instance or can they be discarded once I've passed the pointer to the unmanaged instance
• What is the correct way to define another COM interface (pointer to the interface type in COM land) as an argument
• Are there any recommendations for PreserveSigPreserveSig or not having it

Gist

IWTSPlugin.cs

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