15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef BASE_WIN_ENUM_VARIANT_H_ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define BASE_WIN_ENUM_VARIANT_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <unknwn.h> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/scoped_ptr.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/win/iunknown_impl.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace win { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// A simple implementation of IEnumVARIANT. 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class BASE_EXPORT EnumVariant 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : public IEnumVARIANT, 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public IUnknownImpl { 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The constructor allocates an array of size |count|. Then use 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // ItemAt to set the value of each item in the array to initialize it. 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) explicit EnumVariant(unsigned long count); 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns a mutable pointer to the item at position |index|. 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VARIANT* ItemAt(unsigned long index); 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // IUnknown. 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ULONG STDMETHODCALLTYPE AddRef() OVERRIDE; 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ULONG STDMETHODCALLTYPE Release() OVERRIDE; 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STDMETHODIMP QueryInterface(REFIID riid, void** ppv) OVERRIDE; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // IEnumVARIANT. 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STDMETHODIMP Next(ULONG requested_count, 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VARIANT* out_elements, 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ULONG* out_elements_received); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STDMETHODIMP Skip(ULONG skip_count); 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STDMETHODIMP Reset(); 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STDMETHODIMP Clone(IEnumVARIANT** out_cloned_object); 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ~EnumVariant(); 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) scoped_ptr<VARIANT[]> items_; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned long count_; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned long current_index_; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace win 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace base 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // BASE_WIN_ENUM_VARIANT_H_ 53