From: fitmap@163.com
Date: 2021-06-30T06:03:31+00:00
Subject: [ruby-core:104446] [Ruby master Bug#18016] fiddle\types.rb	typealias maybe wrong

Issue #18016 has been reported by fitmap (Justin Peal).

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

* Author: fitmap (Justin Peal)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x64-mingw32]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
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*"




-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>