Esempi in C++ (Cpp) per IXMLDOMDocumentPtr::GetIID

Esempio n. 1

File: AutoUpdateDlg.cpp Progetto: anyboo/project

BOOL CAutoUpdateDlg::CheckVersionUpdate(CString& strUpdateURL)
{
	BOOL bHasUpdate = FALSE;

	HRESULT hr = S_OK;
	IXMLHTTPRequestPtr pHttpRequest;
	IDispatchPtr pDispatch;
	MSXML2::IXMLDOMDocumentPtr pXmlDoc;
	MSXML2::IXMLDOMNodeListPtr pList;
	MSXML2::IXMLDOMElementPtr pChild;

	UINT nFileSize;
	CString strFileName, strFileVer, strMD5String;
	LONG lElementCount = 0L;

	try
	{
		hr = pHttpRequest.CreateInstance(TEXT("Msxml2.XMLHTTP.3.0"));
		if( FAILED(hr) )
			_com_issue_error(hr);

		hr = pHttpRequest->open(TEXT("GET"), (_bstr_t)strUpdateURL, false);
		if( FAILED(hr) )
			_com_issue_error(hr);

		hr = pHttpRequest->send();
		if( FAILED(hr) )
			_com_issue_error(hr);

		if (pHttpRequest->Getstatus() != 200)
			throw (0);

		pDispatch = pHttpRequest->GetresponseXML();
		hr = pDispatch->QueryInterface(pXmlDoc.GetIID(), (void**)&pXmlDoc);
		if( FAILED(hr) )
			_com_issue_error(hr);

		pList = pXmlDoc->selectNodes("/manifest/filelist/file");
		lElementCount = pList->Getlength();
		for( LONG i = 0; i < lElementCount; i++ )
		{
			pChild = pList->Getitem(i);
			strFileName = pChild->getAttribute("filename");
			nFileSize = pChild->getAttribute("filesize");
			strFileVer = pChild->getAttribute("fileversion");
			strMD5String = pChild->getAttribute("md5");

			//如果本地文件存在则效验文件，不存在就下载这个文件
			if (PathFileExists(m_strCurrentDir+strFileName))
			{
				//效验文件,如果MD5码不相同则重新下载
				if (CMD5Checksum::GetMD5(m_strCurrentDir+strFileName) != strMD5String)
				{
					m_ulTotalLength += nFileSize;
					m_DownloadMgr.AddTask(strFileName);
					bHasUpdate = TRUE;
				}	
			}
			else
			{
				m_ulTotalLength += nFileSize;
				m_DownloadMgr.AddTask(strFileName);
				bHasUpdate = TRUE;
			}
		}

		return bHasUpdate;
	}
#ifdef _DEBUG
	catch(_com_error& e)
	{
		CString strError;
		strError.Format(_T("Error code:%d\nMessage:%s\nDescrption:%s"), (int)e.WCode(), e.ErrorMessage(), (TCHAR*)e.Description());
		MessageBox(strError, _T("提示"), MB_OK|MB_ICONWARNING);
		return FALSE;
	}
#endif
	catch(...)
	{
		return FALSE;
	}
}