[转载]裸写一个含内嵌IE控件的窗口

引言

 

之前也做过一些含内嵌IE控件的东西,只是一直用MFC/ATL等框架,对于里面的原理其实一知半解,只有脱离它们写一遍,才算能真正懂。前不久在写一个SkyDriveClient的时候正好有一个需求,就练习了一下。技术含量没有,在此记录一笔,供后来人入门,供前辈们批评。

 

本文中,行文以流水帐、贴代码方式为主,同时为了不带来干扰,代码将尽量以不带或少带封装的方式书写。目标明确,只为“功利性”地实现一个带IE控件的窗口。对于未实现的接口也不进行任何解释。

 

建立普通窗口

 

首先,我们建立一个普通的窗口程序。向导生成即可,剔除点代码,整理一下,代码清单如下:

 

#include<Windows.h>

#include<tchar.h>

 

LRESULTCALLBACK WndProc(HWNDhWnd, UINTmessage, WPARAMwParam, LPARAMlParam)

{

    switch (message)

    {

    caseWM_DESTROY:

        PostQuitMessage(0);

        break;

    default:

        returnDefWindowProc(hWnd, message, wParam, lParam);

    }

 

    return 0;

}

 

intAPIENTRY_tWinMain(_In_HINSTANCE     hInstance,

                       _In_opt_HINSTANCEhPrevInstance,

                       _In_LPTSTR        lpCmdLine,

                       _In_int           nCmdShow)

{

    UNREFERENCED_PARAMETER(hPrevInstance);

    UNREFERENCED_PARAMETER(lpCmdLine);

 

    constLPCTSTR CLASS_NAME = _T("WebBrowserContainer");

 

    WNDCLASSEX wcex    = { sizeof(WNDCLASSEX) };

    wcex.style         = CS_HREDRAW | CS_VREDRAW;

    wcex.lpfnWndProc   = WndProc;

    wcex.cbClsExtra    = 0;

    wcex.cbWndExtra    = 0;

    wcex.hInstance     = hInstance;

    wcex.hCursor       = LoadCursor(nullptr, IDC_ARROW);

    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

    wcex.lpszClassName = CLASS_NAME;

 

    RegisterClassEx(&wcex);

 

    HWND hWnd = CreateWindow(CLASS_NAME,

                             _T("WebBrowser Sample"),

                             WS_OVERLAPPEDWINDOW,

                             CW_USEDEFAULT,

                             0,

                             CW_USEDEFAULT,

                             0,

                             nullptr,

                             nullptr,

                             hInstance,

                             nullptr);

 

    if (hWnd == nullptr)

    {

        return 0;

    }

 

    ShowWindow(hWnd, nCmdShow);

    UpdateWindow(hWnd);

 

    MyWebBrowser wb(hWnd);

 

    MSG msg = {};

 

    while (GetMessage(&msg, nullptr, 0, 0))

    {

        if (!TranslateAccelerator(msg.hwnd, nullptr, &msg))

        {

            TranslateMessage(&msg);

            DispatchMessage(&msg);

        }

    }

 

    return (int)msg.wParam;

}

 

加入WebBrowser

这一部分主要参考了《使用C++实现SDK之WebBrowser容器》(http://blog.csdn.net/norsd/article/details/2921389)。但是这篇文章里没有给出真正可运行的代码,有几处小笔误,然后呢,其实我也不是很喜欢原作者的封装方式。本篇的目的是尽可能简单、原始,让后来者容易上手。

 

实现OLE容器类

实现一个WebBrowser,先要实现一个OLE容器类。我不知道OLE容器类的精确定义是什么,但现在我们需要实现三个接口:IOleClientSiteIOleInPlaceSiteIOleInPlaceFrame<OleIdl.h>)。它们的定义在MSDN上都可以查到。

 

代码清单如下:

 

#pragmaonce

 

#include<Windows.h>

#include<OleIdl.h>

 

classOleContainer : publicIOleClientSite,

                     publicIOleInPlaceSite,

                     publicIOleInPlaceFrame

{

public:

    OleContainer() : m_nRefCount(0),

                     m_pStorage(nullptr),

                     m_pOleObj(nullptr),

                     m_pInPlaceObj(nullptr),

                     m_hWindow(nullptr)

    {

        AddRef();

        OleInitialize(nullptr);

    }

 

    ~OleContainer()

    {

        if (m_pInPlaceObj != nullptr)

        {

            m_pInPlaceObj->Release();

            m_pInPlaceObj = nullptr;

        }

 

        if (m_pOleObj != nullptr)

        {

            m_pOleObj->Release();

            m_pOleObj = nullptr;

        }

 

        if (m_pStorage != nullptr)

        {

            m_pStorage->Release();

            m_pStorage = nullptr;

        }

 

        OleUninitialize();

    }

 

public:

    bool CreateOleObject(constIID &clsid)

    {

        HRESULT hr = StgCreateDocfile(nullptr,

                                        STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_DIRECT | STGM_CREATE,

                                        0,

                                        &m_pStorage);

        if (FAILED(hr))

        {

            returnfalse;

        }

 

        hr = OleCreate(clsid, IID_IOleObject, OLERENDER_DRAW, 0, this, m_pStorage, (LPVOID *)&m_pOleObj);

 

        if (FAILED(hr))

        {

            returnfalse;

        }

 

        hr = m_pOleObj->QueryInterface(IID_IOleInPlaceObject, (LPVOID *)&m_pInPlaceObj);

 

        if (FAILED(hr))

        {

            returnfalse;

        }

 

        returntrue;

    }

 

    bool InPlaceActive(HWNDhWnd, LPCRECTlpRect)

    {

        if (hWnd == nullptr)

        {

            returnfalse;

        }

 

        RECT rect = {};

 

        if (lpRect == nullptr)

        {

            GetClientRect(hWnd, &rect);

            lpRect = &rect;

        }

 

        HRESULT hr = m_pOleObj->DoVerb(OLEIVERB_INPLACEACTIVATE, nullptr, this, 0, hWnd, lpRect);

 

        if (FAILED(hr))

        {

            returnfalse;

        }

 

        m_hWindow = hWnd;

 

        returntrue;

    }

 

public: // IUnknown Methods

    HRESULTSTDMETHODCALLTYPE QueryInterface(REFIIDriid, LPVOID *ppvObject)

    {

        *ppvObject = nullptr;

 

        if (riid == IID_IUnknown)

        {

            *ppvObject = (IOleClientSite *)this;

        }

 

 

        elseif (riid == IID_IOleInPlaceSite)

        {

            *ppvObject = (IOleInPlaceSite *)this;

        }

        elseif (riid == IID_IOleInPlaceUIWindow)

        {

            *ppvObject = (IOleInPlaceUIWindow *)this;

        }

        elseif (riid == IID_IOleInPlaceFrame)

        {  

            *ppvObject = (IOleInPlaceFrame *)this;

        }

 

        if (*ppvObject == nullptr)

        {

            returnE_NOINTERFACE;

        }

 

        AddRef();

        returnS_OK;

    }

 

    ULONGSTDMETHODCALLTYPE AddRef()

    {

        return (ULONG)InterlockedIncrement(&m_nRefCount);

    }

 

    ULONGSTDMETHODCALLTYPE Release()

    {

        LONG nRefCount = InterlockedDecrement(&m_nRefCount);

 

        if (nRefCount <= 0)

        {

            deletethis;

        }

 

        return (ULONG)nRefCount;

    }

 

public: // IOleClientSite Methods

    STDMETHOD(SaveObject)()

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(GetMoniker)(DWORDdwAssign, DWORDdwWhichMoniker, IMoniker **ppmk)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(GetContainer)(IOleContainer **ppContainer)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(ShowObject)()

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(OnShowWindow)(BOOLfShow)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(RequestNewObjectLayout)()

    {

        returnE_NOTIMPL;

    }

 

public: // IOleWindow Methods

    STDMETHOD(GetWindow)(HWND *phwnd)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(ContextSensitiveHelp)(BOOLfEnterMode)

    {

        returnE_NOTIMPL;

    }

 

public: // IOleInPlaceSite Methods

    STDMETHOD(CanInPlaceActivate)()

    {

        return m_hWindow == nullptr ? S_OK : S_FALSE;

    }

 

    STDMETHOD(OnInPlaceActivate)()

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(OnUIActivate)()

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(GetWindowContext)(IOleInPlaceFrame **ppFrame,

                                IOleInPlaceUIWindow **ppDoc,

                                LPRECTlprcPosRect,

                                LPRECTlprcClipRect,

                                LPOLEINPLACEFRAMEINFOlpFrameInfo)

    {

        if (m_hWindow == nullptr)

        {

            returnE_NOTIMPL;

        }

 

        *ppFrame = (IOleInPlaceFrame*)this;

        *ppDoc = NULL;

        AddRef();

 

        GetClientRect(m_hWindow, lprcPosRect);

        GetClientRect(m_hWindow, lprcClipRect);

 

        lpFrameInfo->cb = sizeof(OLEINPLACEFRAMEINFO);

        lpFrameInfo->fMDIApp = false;

        lpFrameInfo->hwndFrame = GetParent(m_hWindow);

        lpFrameInfo->haccel = nullptr;

        lpFrameInfo->cAccelEntries = 0;

 

        returnS_OK;

    }

 

    STDMETHOD(Scroll)(SIZEscrollExtant)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(OnUIDeactivate)(BOOLfUndoable)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(OnInPlaceDeactivate)()

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(DiscardUndoState)()

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(DeactivateAndUndo)()

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(OnPosRectChange)(LPCRECTlprcPosRect)

    {

        returnE_NOTIMPL;

    }

 

public: // IOleInPlaceUIWindow Methods

    STDMETHOD(GetBorder)(LPRECTlprectBorder)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(RequestBorderSpace)(LPCBORDERWIDTHSpborderwidths)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(SetBorderSpace)(LPCBORDERWIDTHSpborderwidths)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(SetActiveObject)(IOleInPlaceActiveObject *pActiveObject, LPCOLESTRpszObjName)

    {

        returnE_NOTIMPL;

    }

 

public: // IOleInPlaceFrame Methods

    STDMETHOD(InsertMenus)(HMENUhmenuShared, LPOLEMENUGROUPWIDTHSlpMenuWidths)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(SetMenu)(HMENUhmenuShared, HOLEMENUholemenu, HWNDhwndActiveObject)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(RemoveMenus)(HMENUhmenuShared)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(SetStatusText)(LPCOLESTRpszStatusText)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(EnableModeless)(BOOLfEnable)

    {

        returnE_NOTIMPL;

    }

 

    STDMETHOD(TranslateAccelerator)(LPMSGlpmsg, WORDwID)

    {

        returnE_NOTIMPL;

    }

 

private:

    LONG m_nRefCount;

 

protected:

    IStorage          *m_pStorage;

    IOleObject        *m_pOleObj;

    IOleInPlaceObject *m_pInPlaceObj;

    HWND               m_hWindow;

};

 

这三个接口,连带他们的父类,总共需要实现31个方法!不过还好,除了篇幅稍微长一点,基本上都是E_NOTIMPL

 

其中CreateOleObjectInPlaceActive是我自己加的,将来要调用的。

 

OleCreate期间,除了若干次QueryInterface之外,GetContainer会被调到一次。OLEIVERB_INPLACEACTIVATE期间,除了若干次QueryInterface之外,CanInPlaceActivateOnInPlaceActivateShowObject会被调到。

 

那些不返回E_NOTIMPL的接口,我也没有一一查询是干嘛的,都是抄的~

 

实现WebBrowser容器类

上一节可视为(通用的)OLE容器类(只是没有使用除WebBrowser之外的其他玩意儿测试过,共性不是很明确,不敢保证通用性),这一节来实现WebBrowser。作为最简单的WebBrowser,不用再额外实现别的借口了,直接使用上面的OleContainer,创建WebBrowser对象即可。

 

代码清单:

 

#pragmaonce

 

#include"OleContainer.h"

#include<ExDisp.h>

 

classWebBrowser : publicOleContainer

{

public:

    WebBrowser(HWNDhParent) : m_pWebBrowser(nullptr), m_hWnd(hParent)

    {

 

    }

 

    ~WebBrowser()

    {

        if (m_pWebBrowser != nullptr)

        {

            m_pWebBrowser->Release();

            m_pWebBrowser = nullptr;

        }

    }

 

public:

    bool CreateWebBrowser()

    {

        if (!CreateOleObject(CLSID_WebBrowser))

        {

            returnfalse;

        }

 

        RECT rect = {};

        GetClientRect(m_hWnd, &rect);

 

        if (!InPlaceActive(m_hWnd, &rect))

        {

            returnfalse;

        }

 

        HRESULT hr = m_pOleObj->QueryInterface(IID_IWebBrowser2, (LPVOID *)&m_pWebBrowser);

 

        if (FAILED(hr))

        {

            returnfalse;

        }

 

        returntrue;

    }

   

public:

    void Navigate(LPCTSTRlpUrl)

    {

        BSTR bstrUrl = SysAllocString(lpUrl);

        m_pWebBrowser->Navigate(bstrUrl, nullptr, nullptr, nullptr, nullptr);

        SysFreeString(bstrUrl);

    }

 

public:

    STDMETHOD(GetWindow)(HWND *phwnd)

    {

        *phwnd = m_hWnd;

        returnS_OK;

 

    }

 

    STDMETHOD(GetWindowContext)(IOleInPlaceFrame **ppFrame,

                                IOleInPlaceUIWindow **ppDoc,

                                LPRECTlprcPosRect,

                                LPRECTlprcClipRect,

                                LPOLEINPLACEFRAMEINFOlpFrameInfo)

    {

        *ppFrame = (IOleInPlaceFrame*)this;

        *ppDoc = NULL;

        AddRef();

 

        GetClientRect(m_hWnd, lprcPosRect);

        GetClientRect(m_hWnd, lprcClipRect);

 

        lpFrameInfo->cb = sizeof(OLEINPLACEFRAMEINFO);

        lpFrameInfo->fMDIApp = false;

        lpFrameInfo->hwndFrame = GetParent(m_hWnd);

        lpFrameInfo->haccel = nullptr;

        lpFrameInfo->cAccelEntries = 0;

 

        returnS_OK;

    }

 

protected:

    IWebBrowser2 *m_pWebBrowser;

    HWND m_hWnd;

};

 

其中CreateWebBrowser 只是简单的调用了一下CreateOleObject,传入CLSID_WebBrowser。然后InPlaceActive就可以了。最后拿的m_pWebBrowser指针是备用的,用于实现一个示例功能:Navigate

 

后面的GetWindowGetWindowContextOleContainer中已经有了,之所以再写一遍,是因为WebBrowser的创建过程中,就会调用GetWindow,需要给出一个窗口句柄;InPlaceActive过程中会调用GetWindowContext,也要做事情,不能return E_NOTIMPL了事。而OleContainer中,暂时我是在InPlaceActive的时候传入窗口句柄的。可能是OleContianer根本应该更早的知道窗口的存在,但这一点我还没弄清楚,所以暂时写成那样。但到WebBrowser层面,创建一个WebBrowser之前就需要先创建好窗口。

 

使用WebBrowser容器类

我们回到Main,创建好主窗口后插入几行代码:

 

intAPIENTRY_tWinMain(_In_HINSTANCE     hInstance,

                       _In_opt_HINSTANCEhPrevInstance,

                       _In_LPTSTR        lpCmdLine,

                       _In_int           nCmdShow)

{

    UNREFERENCED_PARAMETER(hPrevInstance);

    UNREFERENCED_PARAMETER(lpCmdLine);

 

    constLPCTSTR CLASS_NAME = _T("WebBrowserContainer");

 

    WNDCLASSEX wcex    = { sizeof(WNDCLASSEX) };

    wcex.style         = CS_HREDRAW | CS_VREDRAW;

    wcex.lpfnWndProc   = WndProc;

    wcex.cbClsExtra    = 0;

    wcex.cbWndExtra    = 0;

    wcex.hInstance     = hInstance;

    wcex.hCursor       = LoadCursor(nullptr, IDC_ARROW);

    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

    wcex.lpszClassName = CLASS_NAME;

 

    RegisterClassEx(&wcex);

 

    HWND hWnd = CreateWindow(CLASS_NAME,

                             _T("WebBrowser Sample"),

                             WS_OVERLAPPEDWINDOW,

                             CW_USEDEFAULT,

                             0,

                             CW_USEDEFAULT,

                             0,

                             nullptr,

                             nullptr,

                             hInstance,

                             nullptr);

 

    if (hWnd == nullptr)

    {

        return 0;

    }

 

    ShowWindow(hWnd, nCmdShow);

    UpdateWindow(hWnd);

 

 

    MSG msg = {};

 

    while (GetMessage(&msg, nullptr, 0, 0))

    {

        if (!TranslateAccelerator(msg.hwnd, nullptr, &msg))

        {

            TranslateMessage(&msg);

            DispatchMessage(&msg);

        }

    }

 

    return (int)msg.wParam;

}

 

 

然后运行,截图如下:

 

 

 

小结

上文演示了一个最简单的在正常窗口嵌入WebBrowser对象的例子。例子代码可在 http://pan.baidu.com/s/18PtQuWebBrowserSample.rar下载。

 

处于直观性考虑,没有做过多的封装和梳理。后面再来梳理这些。

posted @ 2016-03-11 15:30  Jingle Guo  阅读(817)  评论(0编辑  收藏  举报