Issue #16116 has been updated by larskanis (Lars Kanis).


@whdukewu Can you provide a reproducible example of such a C# DLL? We got [several issues](https://github.com/oneclick/rubyinstaller2/search?q=win32ole&type=issues) with WIN32OLE at RubyInstaller, but I wasn't able to reproduce them - mostly because they depend on some proprietary COM DLLs. Your use case seems easy enough to be usable for investigation of the issue.

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Bug #16116: ruby2.6.3(x86/x64)  use win32ole could not new Object, return 0x80070057
https://bugs.ruby-lang.org/issues/16116#change-88922

* Author: whdukewu (Kewu DU)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [i386-mingw32]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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I build a RubyTest.dll by C#, In ruby2.2, I could use WIN32OLE.new to create ole object, but in the same system under ruby2.6.3, it failed to create ole object by WIN32OLE.new, is there any different between ruby 2.2 and ruby 2.6.3 in WIN32OLE?

OS: Win7 Profressional SP1 64bit

*/////// Ruby 2.6.3 use WIN32OLE failed to load dll //////////*
C:\Ruby26\bin>ruby -v
ruby 2.6.3p62 (2019-04-16 revision 67580) [i386-mingw32]

C:\Ruby26\bin>irb
irb(main):001:0> require 'win32ole'
=> true
irb(main):002:0> WIN32OLE.new('RubyTest.DllTest')
Traceback (most recent call last):
        6: from C:/Ruby26/bin/irb.cmd:31:in `<main>'
        5: from C:/Ruby26/bin/irb.cmd:31:in `load'
        4: from C:/Ruby26/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (require
        3: from (irb):2
        2: from (irb):2:in `new'
        1: from (irb):2:in `initialize'
WIN32OLERuntimeError (failed to create WIN32OLE object from `RubyTest.DllTest')
**    HRESULT error code:0x80070057
      The parameter is incorrect.**
irb(main):003:0>



c:\TestTools\impeller\lib\Ruby\bin>ruby -v
ruby 2.2.6p396 (2016-11-15 revision 56800) [i386-mingw32]


*/////// Ruby 2.2 use WIN32OLE success load dll //////////*
c:\TestTools\impeller\lib\Ruby\bin>irb
irb(main):001:0> require 'win32ole'
=> true
irb(main):002:0> WIN32OLE.new('RubyTest.DllTest')
@@@DllTest Constructor
=> #<WIN32OLE:0x7418b68>
irb(main):003:0>



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