Issue #10820 has been updated by Rob Reynolds.


Looks like you may want to explore the same for `RegQueryInfoKey` as well. See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724902.aspx

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Bug #10820: Win32 Registry Delete uses ANSI instead of Wide APIs
https://bugs.ruby-lang.org/issues/10820#change-51346

* Author: Rob Reynolds
* Status: Open
* Priority: Normal
* Assignee: Usaku NAKAMURA
* ruby -v: 2.1.5
* Backport: 2.0.0: UNKNOWN, 2.1: REQUIRED, 2.2: REQUIRED
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https://github.com/ruby/ruby/blob/trunk/ext/win32/lib/win32/registry.rb#L236-L237

Contains:
~~~
 module API
      include Constants
      extend Importer
      dlload "advapi32.dll"
      [
        "long RegOpenKeyExW(void *, void *, long, long, void *)",
        "long RegCreateKeyExW(void *, void *, long, long, long, long, void *, void *, void *)",
        "long RegEnumValueW(void *, long, void *, void *, void *, void *, void *, void *)",
        "long RegEnumKeyExW(void *, long, void *, void *, void *, void *, void *, void *)",
        "long RegQueryValueExW(void *, void *, void *, void *, void *, void *)",
        "long RegSetValueExW(void *, void *, long, long, void *, long)",
        "long RegDeleteValue(void *, void *)",
        "long RegDeleteKey(void *, void *)",
        "long RegFlushKey(void *)",
        "long RegCloseKey(void *)",
        "long RegQueryInfoKey(void *, void *, void *, void *, void *, void *, void *, void *, void *, void *, void *, void *)",
      ].each do |fn|
        cfunc = extern fn, :stdcall
        const_set cfunc.name.intern, cfunc
      end
~~~

Should use `RegDeleteValueW` and `RegDeleteKeyW`.



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