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    [id(8), helpstring("method GetErrorStr")] HRESULT GetErrorStr([in] DWORD errCode, [out] VARIANT* errStr);
  2. or download this
    use strict;
use Win32::OLE;
...

    my $errstr = Variant(VT_BSTR|VT_BYREF, Variant(VT_EMPTY));
    $obj->GetErrorStr( Variant(VT_I4|VT_BYREF, 12345), $errstr );