From: "usa (Usaku NAKAMURA)" <noreply@...>
Date: 2021-11-24T10:25:43+00:00
Subject: [ruby-core:106254] [Ruby master Bug#18016] fiddle\types.rb typealias maybe wrong

Issue #18016 has been updated by usa (Usaku NAKAMURA).

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

ruby_2_7 6601fb5672dc4c1f4bf5ee0f9b3f97a029df06cd merged revision(s) 25e56fe374478a2266ac25f22a07bb3c6a423c83,8758b07b1e4fd636dffb4b442388a3033c63d4b5,791e8eec66d3aebcee36c1369b0bf52bc3815e94.

----------------------------------------
Bug #18016: fiddle\types.rb typealias maybe wrong
https://bugs.ruby-lang.org/issues/18016#change-94874

* 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: DONE, 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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