如何:在ActiveX控件中獲得頂層IWebBrowser2接口

說明了如何在控件中獲得所在窗口的IWebBrowser2的引用。但是，開發(fā)者實(shí)際上經(jīng)常需要的是飽含框架集的頂層IWebBrowser2的引用。例如，當(dāng)你在網(wǎng)頁載入之前調(diào)用statusText() 命令設(shè)置狀態(tài)欄的值時(shí)可以用到。因?yàn)檫@個(gè)屬性對WebBrowser控件無效，所以調(diào)用所在框架的IWebBrowser2的函數(shù)會(huì)產(chǎn)生錯(cuò)誤。

更多信息

為獲得頂層IWebBrowser2 引用, 從客戶站點(diǎn)獲取IServiceProvider 并且 執(zhí)行一個(gè)QueryService 操作獲取IID_IServiceProvider服務(wù)SID_STopLevelBrowser (在Shlguid.h中定義)。對第二個(gè)IServiceProvider，執(zhí)行一個(gè)QueryService 獲取IID_IWebBrowser2 服務(wù)SID_SWebBrowserApp.

干這個(gè)的最好的地方是在IOleObject的SetClientSite() 方法里面：

#include 

#define COMRELEASE(ptr)/
	if (ptr != NULL) {/
	ptr->Release();/
	ptr = NULL;/
	}

IWebBrowser2 *browser = NULL;

STDMETHODIMP SetClientSite(IOleClientSite *pClientSite)
{
	HRESULT hr = S_OK;
	IServiceProvider *isp, *isp2 = NULL;
	if (!pClientSite)
	{
	COMRELEASE(browser);
	}
	else
	{
	hr = pClientSite->QueryInterface(IID_IServiceProvider, reinterpret_cast(&isp));
	if (FAILED(hr))
	{
	hr = S_OK;
	goto cleanup;
	}
	hr = isp->QueryService(SID_STopLevelBrowser, IID_IServiceProvider, reinterpret_cast(&isp2));
	if (FAILED(hr))
	{
	hr = S_OK;
	goto cleanup;
	}
	hr = isp2->QueryService(SID_SWebBrowserApp, IID_IWebBrowser2, reinterpret_cast(&browser));
	if (FAILED(hr))
	{
	hr = S_OK;
	goto cleanup;
	}
	cleanup:
	// Free resources.
	COMRELEASE(isp);
	COMRELEASE(isp2);
	return hr;
	}
} 

參考

要更多信息，單擊下面的文檔編號查看微軟知識(shí)庫中的文章

要更多關(guān)于開發(fā)基于Web的Internet Explorer解決方案，請?jiān)L問下列站點(diǎn)：

http://msdn.microsoft.com/ie/

http://support.microsoft.com/highlights/iep.asp?FR=0&SD=MSDN

© 微軟公司 2000，保留所有權(quán)利

微軟公司的Jay Andrew Allen 投稿

額外的查詢關(guān)鍵字：IServiceProvider SID_STopLevelBrowser IWebBrowser2

關(guān)鍵字: kbActiveX kbCtrl kbIE kbIE400 kbGrpDSInet kbie500 kbDSupport kbie501 kbie550
文章類型 : kbhowto
技術(shù) : kbIEsearch kbAudDeveloper kbSDKIESearch kbIE500Search kbSDKIE400 kbSDKIE401 kbSDKIE401SP1 kbSDKIE401SP2 kbSDKIE500 kbSDKIE501 kbSDKIE550 kbIE550Search

How To Retrieve the Top-Level IWebBrowser2 Interface from an ActiveX Control

2006/3/27 19:25:36

P {margin:0px;padding:0px;} body {font-size:10pt;font-family:Tahoma;}

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q257717

How To Retrieve the Top-Level IWebBrowser2 Interface from an ActiveX Control

View products that this article applies to.

This article was previously published under Q257717

SUMMARY

The Microsoft Knowledge Base article

172763 (http://support.microsoft.com/kb/172763/EN-US/) INFO: Accessing the Object Model from Within an ActiveX Control

MORE INFORMATION

To retrieve the top-level IWebBrowser2 reference, get IServiceProvider from the client site and perform a QueryService for IID_IServiceProvider under the service SID_STopLevelBrowser (defined in Shlguid.h). From this second IServiceProvider, perform a QueryService for IID_IWebBrowser2 in the SID_SWebBrowserApp service.

The best place to perform this work is in the SetClientSite() method of IOleObject:

#include

#define COMRELEASE(ptr)/
if (ptr != NULL) {/
ptr->Release();/
ptr = NULL;/
}

IWebBrowser2 *browser = NULL;

STDMETHODIMP SetClientSite(IOleClientSite *pClientSite)
{
HRESULT hr = S_OK;
IServiceProvider *isp, *isp2 = NULL;
if (!pClientSite)
{
COMRELEASE(browser);
}
else
{
hr = pClientSite->QueryInterface(IID_IServiceProvider, reinterpret_cast(&isp));
if (FAILED(hr))
{
hr = S_OK;
goto cleanup;
}
hr = isp->QueryService(SID_STopLevelBrowser, IID_IServiceProvider, reinterpret_cast(&isp2));
if (FAILED(hr))
{
hr = S_OK;
goto cleanup;
}
hr = isp2->QueryService(SID_SWebBrowserApp, IID_IWebBrowser2, reinterpret_cast(&browser));
if (FAILED(hr))
{
hr = S_OK;
goto cleanup;
}
cleanup:
// Free resources.
COMRELEASE(isp);
COMRELEASE(isp2);
return hr;
}
}

REFERENCES

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

172763 (http://support.microsoft.com/kb/172763/EN-US/) INFO: Accessing the Object Model from Within an ActiveX Control

http://msdn.microsoft.com/library/default.asp?url=/workshop/entry.asp (http://msdn.microsoft.com/library/default.asp?url=/workshop/entry.asp)

http://msdn.microsoft.com/ie/ (http://msdn.microsoft.com/ie/)

http://support.microsoft.com/iep (http://support.microsoft.com/iep)

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