使用WinInet类，连接HTTP服务器，在下载大文件时，程序会未响应

sherlockcsdn_1 2015-01-14 09:48:46



DWORD WINAPI CUpdateDlg::DownloadFileFromWeb(LPVOID lParam)

{

	CUpdateDlg *pDlg=(CUpdateDlg *)lParam;

	pDlg->strFileURLInServer != ""; 

	pDlg->strFileLocalFullPath != ""; 

	CInternetSession session; 

	CHttpConnection* pHttpConnection = NULL; 

	CHttpFile* pHttpFile = NULL; 

	CString strServer, strObject; 

	INTERNET_PORT wPort; 

	BOOL bReturn = FALSE; 



	DWORD dwType; 

	const int nTimeOut = 2000; 

	session.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, nTimeOut); //重试之间的等待延时 

	session.SetOption(INTERNET_OPTION_CONNECT_RETRIES, 1); //重试次数 

	char* pszBuffer = NULL; 



	



	try 

	{ 

		AfxParseURL(pDlg->strFileURLInServer, dwType, strServer, strObject, wPort); 

		pHttpConnection = session.GetHttpConnection(strServer, wPort); 

		pHttpFile = pHttpConnection->OpenRequest(CHttpConnection::HTTP_VERB_GET, strObject); 

		if(pHttpFile->SendRequest() == FALSE) 

			return FALSE; 

		DWORD dwStateCode; 



		pHttpFile->QueryInfoStatusCode(dwStateCode); 

		if(dwStateCode == HTTP_STATUS_OK) 

		{ 

			HANDLE hFile = CreateFile(pDlg->strFileLocalFullPath, GENERIC_WRITE, 

				FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 

				NULL); //创建本地文件 

			if(hFile == INVALID_HANDLE_VALUE) 

			{ 

				pHttpFile->Close(); 

				pHttpConnection->Close(); 

				session.Close(); 

				return FALSE; 

			} 



			char szInfoBuffer[1000]; //返回消息 

			DWORD dwFileSize = 0; //文件长度 

			DWORD dwInfoBufferSize = sizeof(szInfoBuffer); 

			BOOL bResult = FALSE; 

			bResult = pHttpFile->QueryInfo(HTTP_QUERY_CONTENT_LENGTH, 

				(void*)szInfoBuffer,&dwInfoBufferSize,NULL); 



			dwFileSize = atoi(szInfoBuffer); 

			const int BUFFER_LENGTH = 1024 * 10; 

			pszBuffer = new char[BUFFER_LENGTH]; //读取文件的缓冲 

			DWORD dwWrite, dwTotalWrite; 

			dwWrite = dwTotalWrite = 0; 

			UINT nRead = pHttpFile->Read(pszBuffer, BUFFER_LENGTH); //读取服务器上数据 



			ofstream fileOut("d:\\TestOut.txt", ios::app);

			CString sDate;

			time_t curUtcTime;

			struct tm *curTime;



			while(nRead > 0) 

			{ 

				

				time(&curUtcTime);

				curTime = localtime(&curUtcTime);	

				sDate.Format("%02d:%02d:%02d", curTime->tm_hour, curTime->tm_min, curTime->tm_sec);

				fileOut << sDate << "start write" << endl;



				WriteFile(hFile, pszBuffer, nRead, &dwWrite, NULL); //写到本地文件 

				ZeroMemory(pszBuffer, BUFFER_LENGTH);

				dwTotalWrite += dwWrite; 



				time(&curUtcTime);

				curTime = localtime(&curUtcTime);	

				sDate.Format("%02d:%02d:%02d", curTime->tm_hour, curTime->tm_min, curTime->tm_sec);

				fileOut << sDate << "start read" << endl;



				nRead = pHttpFile->Read(pszBuffer, BUFFER_LENGTH); 



				pDlg->nPecent += 1000 * nRead / ((float)dwFileSize);

				//m_progressDownload.SetPos((int)nPecent);

				//Sleep(5);

			} 



			pDlg->nPecent = 1000;

			//GetDlgItem(CUpdateDlg.m_hWnd, uid)->SetPos((int)nPecent);

			//m_progressDownload.SetPos((int)nPecent);



			delete[]pszBuffer; 

			pszBuffer = NULL; 

			CloseHandle(hFile); 

			bReturn = TRUE; 

		} 

	} 

	catch(CInternetException* e) 

	{ 

		TCHAR tszErrString[256]; 

		e->GetErrorMessage(tszErrString, sizeof(tszErrString)); 

		TRACE(_T("Download XSL error! URL: %s,Error: %s"), pDlg->strFileURLInServer, tszErrString); 

		e->Delete(); 

	} 

	catch(...) 

	{ 

	} 



	if(pszBuffer != NULL) 

	{ 

		delete[]pszBuffer; 

	} 

	if(pHttpFile != NULL) 

	{ 

		pHttpFile->Close(); 

		delete pHttpFile; 

	} 

	if(pHttpConnection != NULL) 

	{ 

		pHttpConnection->Close(); 

		delete pHttpConnection; 

	} 

	session.Close(); 

	return bReturn; 

}