From: nagachika00@...
Date: 2021-07-18T02:43:18+00:00
Subject: [ruby-core:104633] [Ruby master Bug#18016] fiddle\types.rb	typealias maybe wrong

Issue #18016 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.6: UNKNOWN, 2.7: REQUIRED, 3.0: REQUIRED to 2.6: UNKNOWN, 2.7: REQUIRED, 3.0: DONE

ruby_3_0 c4b602e80fdc1824c68602302a4ed82a0e90d5b7 merged revision(s) 25e56fe374478a2266ac25f22a07bb3c6a423c83,8758b07b1e4fd636dffb4b442388a3033c63d4b5,791e8eec66d3aebcee36c1369b0bf52bc3815e94.

----------------------------------------
Bug #18016: fiddle\types.rb typealias maybe wrong
https://bugs.ruby-lang.org/issues/18016#change-92935

* Author: fitmap (Justin Peal)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x64-mingw32]
* Backport: 2.6: UNKNOWN, 2.7: REQUIRED, 3.0: DONE
----------------------------------------
in ...\lib\ruby\3.0.0\fiddle\types.rb

module Fiddle
  module Win32Types
    def included(m) # :nodoc:
      m.module_eval{
        # ...
        typealias "HANDLE", "uintptr_t"
        # ...
        typealias "HINSTANCE", "unsigned int"
        typealias "HDC", "unsigned int"
        typealias "HWND", "unsigned int"
      }
    end
    module_function :included
  end
  # ...
end

HINSTANCE, HDC, HWND are pointers to struct, so in 64-bit system, the size of them will be 64 bits, not unsigned int (32bits).

In minwindef.h :

DECLARE_HANDLE(HINSTANCE);

In windef.h :

DECLARE_HANDLE(HDC);
DECLARE_HANDLE            (HWND);

In winnt.h :

#define DECLARE_HANDLE(name) struct name##__{int unused;}; typedef struct name##__ *name

So I suggest typealias in types.rb change to:

        typealias "HINSTANCE", "void*"
        typealias "HDC", "void*"
        typealias "HWND", "void*"




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