How do I add a function to a plug-in

[PSL]

I think in...squirrel04rel64.dll To add some functions.
I successfully compiled through the source code, but I do not know how to add a custom function in the source code, I want to add a function to disable the player key in the source code, how should I write？

[vitovc]

interaction with player's game of plugin is limited by VCMP API. You can detect keypress event but disable that.