Issue #12987 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Closed

I tried with `ruby 2.6.3p62 (2019-04-16 revision 67580) [i386-mingw32]` and `ruby 1.9.3p551 (2014-11-13) [i386-mingw32]` and was able to call a function without an argument:

```ruby
require 'Win32API'
getch = Win32API.new("C:\\Windows\\SysWOW64\\crtdll.dll", "_getch", [], 'L')
getch.Call
# => 97
```

So I think this can be closed.

----------------------------------------
Bug #12987: Win32 API.rb can not call function without argument.
https://bugs.ruby-lang.org/issues/12987#change-87539

* Author: katonbo (Masahiro Kitajima)
* Status: Closed
* Priority: Normal
* Backport: 2.1: WONTFIX, 2.2: REQUIRED, 2.3: REQUIRED
----------------------------------------
In Win32API.rb, it is not possible to call a function without arguments.
I could avoid it for the time being if I did the following (against trunk).

~~~
diff --git a/ext/win32/lib/Win32API.rb b/ext/win32/lib/Win32API.rb
index d03ecc1..946be3e 100644
--- a/ext/win32/lib/Win32API.rb
+++ b/ext/win32/lib/Win32API.rb
@@ -17,6 +17,7 @@ class Win32API
   def initialize(dllname, func, import, export = "0", calltype = :stdcall)
     @proto = [import].join.tr(WIN32_TYPES, DL_TYPES).sub(/^(.)0*$/, '\1')
     import = @proto.chars.map {|win_type| TYPEMAP[win_type.tr(WIN32_TYPES, DL_T
+    @proto = "" if @proto == "0"
     export = TYPEMAP[export.tr(WIN32_TYPES, DL_TYPES)]
     calltype = Fiddle::Importer.const_get(:CALL_TYPE_TO_ABI)[calltype]
~~~



-- 
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