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Thread: IHTMLDocument2 load from memory

  1. #1
    Join Date
    Jun 2006
    Posts
    49

    Question IHTMLDocument2 load from memory

    Greetings...

    I'm trying to load HTML from memory into the IHTMLDocument2:
    (OnInitDialog)
    Code:
    	InfoStr = "<html><body><h1>test</h1></body></html>";
    
    	CComVariant address("about:blank");
    	internetExplorer.Navigate2(&address, NULL, NULL, NULL, NULL);
    
    	LPDISPATCH documentDispatch = internetExplorer.get_Document();
    	if (documentDispatch)
    	{
    		CComPtr<IHTMLDocument2> document;
    		if (SUCCEEDED(documentDispatch->QueryInterface(__uuidof(IHTMLDocument2), (void**)&document)) && document)
    		{
    			CComPtr<IPersistStreamInit> persistStreamInit;
    			if (SUCCEEDED(document->QueryInterface(__uuidof(IPersistStreamInit), (void**)&persistStreamInit)) && persistStreamInit)
    			{
    				if (SUCCEEDED(persistStreamInit->InitNew()))
    				{
    					TCHAR* memory = (TCHAR*)GlobalAlloc(GMEM_MOVEABLE, (InfoStr.GetLength() + 1)*sizeof(TCHAR));
    					if (memory)
    					{
    						_tcscpy(memory, InfoStr.GetBuffer());
    						memory[InfoStr.GetLength()] = 0;
    
    						CComPtr<IStream> stream;
    						if (CreateStreamOnHGlobal((HGLOBAL)memory, TRUE, &stream) == S_OK)
    						{
    							HRESULT result = persistStreamInit->Load(stream);
    							bool stop = true;
    						}
    					}
    				}
    			}
    		}
    	}
    (internetExplorer -- created by "Insert ActiveX Control" from "Microsoft Web Browser")
    persistStreamInit->Load returns S_OK, but internetExplorer shows an empty page.
    What's wrong here?

    Best regards...

  2. #2
    Join Date
    Aug 2002
    Posts
    879

    Re: IHTMLDocument2 load from memory

    Well try this

    in your header
    Code:
    	void DisplayDirect(CString sHtml);
    	HRESULT LoadHtmlFromStream(IStream* pStream);
    Code:
    void CHTMLDlg::DisplayDirect(CString sHtml)
    {
    	HRESULT hr;
    	HGLOBAL hHTMLText;
    	IStream* pStream = NULL;
    
    	hHTMLText = GlobalAlloc( GPTR, sHtml.GetLength()+1 );
    	if (hHTMLText) {
    		lstrcpy((char*)hHTMLText, sHtml);
    		hr = CreateStreamOnHGlobal(hHTMLText, TRUE, &pStream );
    			if (SUCCEEDED(hr)) {
    				LoadHtmlFromStream(pStream);
    				pStream->Release();
    			}
    	}
    }
    
    HRESULT CHMTLDlg::LoadHtmlFromStream(IStream* pStream)
    {
    	HRESULT hr;
    	IDispatch* pHtmlDoc = NULL;
    	IPersistStreamInit* pPersistStreamInit = NULL;
    
    	internetExplorer.Navigate( _T("about:blank"), NULL, NULL, NULL, NULL );
    	pHtmlDoc = internetExplorer.GetDocument(); // m_WebBrowser is your control
    	
    	if (pHtmlDoc) 
    	{
    		pHtmlDoc->QueryInterface( IID_IPersistStreamInit, (void**)&pPersistStreamInit );
    		pPersistStreamInit->InitNew();
    		pPersistStreamInit->Load( pStream );
    		pPersistStreamInit->Release();
    	}
    	return hr;
    }
    usage
    Code:
    DisplayDirect("<html><body><h1>test</h1></body></html>");

  3. #3
    Join Date
    Jul 2007
    Posts
    1

    Re: IHTMLDocument2 load from memory

    I have been studying how to use c++ to display HTML in a window. After looking at what msdn had, I found reliable samples at
    1. http://www.adp-gmbh.ch/win/misc/mshtml/HTMLWindow.html and
    2. http://www.codeproject.com/com/cwebpage.asp

    The samples should privide some examples.

    But can someone solve the problem below:

    I compliled both codes and they work... but fails in other PCs.
    Compliled in Window 2000 server on Vb. Net 2003.

    Known PCs to work:
    xp
    Not working on:
    Windows 2000 professional

    I could not find other platforms to test.

    When I trace HTMLWindow(René Nyffenegger) codes, it seems to fail at HTMLWindow.cpp/long HTMLWindow::HTML(std::string const& html_txt)/if (!lpDispatch->QueryInterface(IID_IHTMLDocument2, (void**)&htmlDoc2))

    So far I have not traced SimpleBrowserDemo(Jeff Glatt). But the compiled application seem to work where the above is working and vise-versa.

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