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c++ - IE Explore 11 < c++ ATL COM Browser Helper Object (Add-on) 替换 DOM 中的文本

转载 作者：塔克拉玛干 更新时间：2023-11-03 07:11:12 25 4
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我正在尝试使用 BHO 从 IE 11 的 Dom 中删除一行 Javascript。 (Internet Explorer 附加组件)

这方面的记录非常糟糕，很难找到最好的前进方向。

我已经设法用 C++ ATL/COM 编写了 BHO，并且它工作正常，但我无法找到从正文中实际删除/替换文本然后将更改注入(inject)回页面的最佳方法。

老实说，我没有时间阅读这本 1000 页的过时 COM 书 :-)。

这是我目前为 OnDocumentComplete 事件准备的内容:

void STDMETHODCALLTYPE CMyFooBHO::OnDocumentComplete(IDispatch *pDisp, VARIANT *pvarURL)
{
    BSTR bstrURL = pvarURL->bstrVal;

    if (_wcsicmp(bstrURL, ABOUT_BLANK) == 0)
    {
        return;
    }

    HRESULT hr = S_OK;

    // Query for the IWebBrowser2 interface.
    CComQIPtr<IWebBrowser2> spTempWebBrowser = pDisp;

    // Is this event associated with the top-level browser?
    if (spTempWebBrowser && m_spWebBrowser && m_spWebBrowser.IsEqualObject(spTempWebBrowser))
    {
        // Get the current document object from browser.
        CComPtr<IDispatch> spDispDoc;
        hr = m_spWebBrowser->get_Document(&spDispDoc);

        if (SUCCEEDED(hr))
        {
            // Verify that what we get is a pointer to a IHTMLDocument2 interface. 
            // To be sure, let's query for the IHTMLDocument2 interface (through smart pointers).

            CComQIPtr<IHTMLDocument2, &IID_IHTMLDocument2> spHTML;
            spHTML = spDispDoc;

            // Extract the source of the document if its HTML.
            if (spHTML)
            {
                // Get the BODY object.
                CComPtr<IHTMLElement> m_pBody;
                hr = spHTML->get_body(&m_pBody);

                if (SUCCEEDED(hr))
                {
                    // Get the HTML text.
                    BSTR bstrHTMLText;
                    hr = m_pBody->get_outerHTML(&bstrHTMLText);

                    if (SUCCEEDED(hr))
                    {
                        // bstrHTMLText now contains the <body> ...whatever... </body> of the html page.

                        // ******** HERE ********

                        // What I want to do here is replace some text contained in bstrHTMLText  
                        // i.e. Replace "ABC" with "DEF" if it exists in bstrHTMLText.

                        // Then replace the body of the original page with the edited bstrHTMLText.

                        // My actual goal is to remove one line of javascript.

                    }
                }
            }
        }
    }
}

请随时评论对现有代码的任何改进。

最佳答案

这不符合正常(应该做)的做法。

如果没有更好的答案，那么我认为它是最佳答案，我将其标记为最佳答案。

我很乐意听到任何改进意见或更新，或者向我展示一个更好的工作示例。

这是针对 IE 11 并在 Visual Studio 2015 中使用 C++ ATL/COM 编译的。

我已经尝试迭代 DOM 并更改它以及所有其他记录非常糟糕的变体。

阅读 html 似乎从来没有问题，即 get_innerText get_innerHTML get_outerHTML in它的形式多种多样，但 put_*** 似乎从来没有在大多数情况下起作用。为什么？似乎没有人能说或给我一个有效的例子。

我确实发现 get_body > get_innerHTML > put_innerHTML 确实有效。

所以找到这个我只是写了一个函数来在 CComBSTR 中搜索和替换。

这对我有用，但我想你可以将返回的内容作为主体内部 HTML 并运行其他一些如果您的要求不同，可以在其上使用 DOM 操作代码(不是内置的东西)。

这种做事方式的主要优点是不依赖于似乎有效的 c**p 未记录代码在 MS 想要的时候以某种神秘的方法。

这是测试 html 页面。我试图删除“警报(“你好”)”当页面完成加载时执行。

<!doctype html>

  <head>
    <title>Site</title>

    <meta http-equiv="cache-control" content="max-age=0" />
    <meta http-equiv="cache-control" content="no-cache" />
    <meta http-equiv="expires" content="0" />
    <meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />
    <meta http-equiv="pragma" content="no-cache" />

  </head>

  <body>

    <div>If a dialog with hello appears then the BHO failed</div>


    <script type="text/javascript">

      window.onload = function(){
        window.document.body.onload = foo; 
      };

      function foo()
      {
          alert("hello");
      }

    </script>

  </body>
<html>
// FooBHO.h : Declaration of the CFooBHO

#pragma once
#include "resource.h"       // main symbols

#include "FooIEAddOn_i.h"

#include <shlguid.h>        // IID_IWebBrowser2, DIID_DWebBrowserEvents2, etc.

#include <exdispid.h>       // DISPID_DOCUMENTCOMPLETE, etc.

#include <mshtml.h>         // DOM interfaces

#include <string> 

#if defined(_WIN32_WCE) && !defined(_CE_DCOM) && !defined(_CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA)
#error "Single-threaded COM objects are not properly supported on Windows CE platform, such as the Windows Mobile platforms that do not include full DCOM support. Define _CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA to force ATL to support creating single-thread COM object's and allow use of it's single-threaded COM object implementations. The threading model in your rgs file was set to 'Free' as that is the only threading model supported in non DCOM Windows CE platforms."
#endif

#define DISPID_DOCUMENTRELOAD 282

using namespace ATL;

using namespace std;

// CFooBHO
class ATL_NO_VTABLE CFooBHO : public CComObjectRootEx<CComSingleThreadModel>,
                                        public CComCoClass<CFooBHO, &CLSID_FooBHO>,
                                        public IObjectWithSiteImpl<CFooBHO>,
                                        public IDispatchImpl<IFooBHO, &IID_IFooBHO, &LIBID_FooIEAddOnLib, /*wMajor =*/ 1, /*wMinor =*/ 0>,
                                        public IDispEventImpl<1, CFooBHO, &DIID_DWebBrowserEvents2, &LIBID_SHDocVw, 1, 1>
{
    public:

        CFooBHO()
        {
        }

        // The STDMETHOD macro is an ATL convention that marks the method as virtual and ensures that it has the right calling convention for the public
        // COM interface.It helps to demarcate COM interfaces from other public methods that may exist on the class.The STDMETHODIMP macro is likewise used
        // when implementing the member method.

        STDMETHOD(SetSite)(IUnknown *pUnkSite);

        DECLARE_REGISTRY_RESOURCEID(IDR_FooBHO)

        DECLARE_NOT_AGGREGATABLE(CFooBHO)

        BEGIN_COM_MAP(CFooBHO)
            COM_INTERFACE_ENTRY(IFooBHO)
            COM_INTERFACE_ENTRY(IDispatch)
            COM_INTERFACE_ENTRY(IObjectWithSite)
        END_COM_MAP()

        DECLARE_PROTECT_FINAL_CONSTRUCT()

        BEGIN_SINK_MAP(CFooBHO)
            SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOCUMENTCOMPLETE, OnDocumentComplete)
        END_SINK_MAP()

        void STDMETHODCALLTYPE OnDocumentComplete(IDispatch *pDisp, VARIANT *pvarURL);

        HRESULT FinalConstruct()
        {
            return S_OK;
        }

        void FinalRelease()
        {
        }

    private:

        CComPtr<IWebBrowser2>  m_spWebBrowser;

        BOOL m_fAdvised;

        static const wchar_t* ABOUT_BLANK;

        void CFooBHO::ReplaceInCComBSTR(CComBSTR &strInput, const wstring &strOld, const wstring &strNew);
};

OBJECT_ENTRY_AUTO(__uuidof(FooBHO), CFooBHO)
// FooBHO.cpp : Implementation of CFooBHO

#include "stdafx.h"
#include "FooBHO.h"
#include "Strsafe.h"

const wchar_t* CFooBHO::ABOUT_BLANK = L"about:blank";

// The SetSite() method is where the BHO is initialized and where you would perform all the tasks that happen only 
// once. When you navigate to a URL with Internet Explorer, you should wait for a couple of events to make sure the
// required document has been completely downloaded and then initialized. Only at this point can you safely access 
// its content through the exposed object model, if any.

STDMETHODIMP CFooBHO::SetSite(IUnknown* pUnkSite)
{
    if (pUnkSite != NULL)
    {
        // Cache the pointer to IWebBrowser2.
        HRESULT hr = pUnkSite->QueryInterface(IID_IWebBrowser2, (void **)&m_spWebBrowser);

        if (SUCCEEDED(hr))
        {
            // Register to sink events from DWebBrowserEvents2.
            hr = DispEventAdvise(m_spWebBrowser);
            if (SUCCEEDED(hr))
            {
                m_fAdvised = TRUE;
            }
        }
    }
    else
    {
        // Unregister event sink.
        if (m_fAdvised)
        {
            DispEventUnadvise(m_spWebBrowser);
            m_fAdvised = FALSE;
        }

        // Release cached pointers and other resources here.
        m_spWebBrowser.Release();
    }

    // Call base class implementation.
    return IObjectWithSiteImpl<CFooBHO>::SetSite(pUnkSite);
}

void STDMETHODCALLTYPE CFooBHO::OnDocumentComplete(IDispatch *pDisp, VARIANT *pvarURL)
{
    BSTR bstrURL = pvarURL->bstrVal;

    // Test for any specific URL here. 
    // Currently we are ignoring ABOUT:BLANK but allowing everything else.

    if (_wcsicmp(bstrURL, ABOUT_BLANK) == 0)
    {
        return;
    }

    HRESULT hr = S_OK;

    // Query for the IWebBrowser2 interface.
    CComQIPtr<IWebBrowser2> spTempWebBrowser = pDisp;

    // Is this event associated with the top-level browser?
    if (spTempWebBrowser && m_spWebBrowser && m_spWebBrowser.IsEqualObject(spTempWebBrowser))
    {
        // Get the current document object from browser.
        CComPtr<IDispatch> spDispDoc;

        if (SUCCEEDED(m_spWebBrowser->get_Document(&spDispDoc)))
        {
            // Verify that what we get is a pointer to a IHTMLDocument2 interface. 
            // To be sure, let's query for the IHTMLDocument2 interface (through smart pointers).

            CComQIPtr<IHTMLDocument2, &IID_IHTMLDocument2> spHTMLDocument2 = spDispDoc;

            // Extract the source of the document if its HTML.
            if (spHTMLDocument2)
            {
                // Get the BODY object.
                CComPtr<IHTMLElement> spBody;

                if (SUCCEEDED(spHTMLDocument2->get_body(&spBody)))
                {
                    // Get the Body HTML text.
                    CComBSTR bstrBodyHTMLText;

                    if (SUCCEEDED(spBody->get_innerHTML(&bstrBodyHTMLText)))
                    {
                        ReplaceInCComBSTR(bstrBodyHTMLText, L"alert(\"hello\");", L"");

                        spBody->put_innerHTML(bstrBodyHTMLText);
                    }
                }
            }
        }
    }
}

void CFooBHO::ReplaceInCComBSTR(CComBSTR &bstrInput, const wstring &strOld, const wstring &strNew)
{
    wstring strOutput(bstrInput);

    size_t iPos = 0;
    size_t iLpos = 0;

    while ((iPos = strOutput.find(strOld, iLpos)) != string::npos)
    {
        strOutput.replace(iPos, strOld.length(), strNew);
        iLpos = iPos + 1;
    }

    ::SysFreeString(bstrInput.m_str);

    // Find and replace is complete; now update the CComBSTR.
    bstrInput.m_str = ::SysAllocString(strOutput.c_str());
}

关于c++ - IE Explore 11 < c++ ATL COM Browser Helper Object (Add-on) 替换 DOM 中的文本，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41214543/

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