Suggestion: Allow function parameters as symbols

[AntonSynytsia]

Suggestion: Allow function parameters as symbols

[djberg96]

It could be supported, but I -REALLY- encourage you to use FFI instead. That said, if you submit a pull request (and the tests pass), I'll merge it.

[AntonSynytsia]

I use both FFI and Win32::API! I use Win32::API because Hook Procedure callbacks work with Win32::API, but they don't work with FFI. See this issue: ffi/ffi#283 Maybe you could suggest something to make it work with FFI

Thanks

[djberg96]

Did you get it working with FFI?

[AntonSynytsia]

Hook procedure is a special circumstance function that requires its callbacks be defined in a separate DLL.
"You must place a global hook procedure in a DLL separate from the application installing the hook procedure".
This works with win32-api because its callbacks are already predefined in a separate .dll/.so, while the FFI creates its callbacks in the application itself.

I haven't got it working with FFI, but it isn't a problem anymore. I decided to stay with Win32::API as it is more user friendly when it comes to using MSFT Windows functions.

I also increased the callback limit to 20. This way I could do more with it.