WinInet开发：1、添加一个下载按钮和一个保存地址按钮，和两个编辑框；并添加各自的变量；2、C*Dlg类添加成员变量： CString url; CString savefilename;3、保存地址按钮的消息映射函数：void CTestDlg::OnWhere() { // TODO: Add your control notification handler code here GetDlgItemText(IDC_URL,url); if(url=="") { AfxMessageBox("请填入URL地址"); return; } //下面得到文件类型，即.后面的字符 CString aboutfile=""; int len = url.GetLength(); for(int i=len-1;url[i] != '.';i--) aboutfile.Insert(0,url[i]); CString strFileName,strFilePath; CString m_szDir = "c:\\"; char BASED_CODE szFilter[] = "All Files (*.*)|*.*||"; CFileDialog OpenDlg(false, NULL, NULL, /*OFN_ALLOWMULTISELECT |*/ OFN_EXPLORER, szFilter); OpenDlg.m_ofn.lStructSize = sizeof(OpenDlg.m_ofn); OpenDlg.m_ofn.hwndOwner = NULL; OpenDlg.m_ofn.lpstrTitle = "保存目标文件"; OpenDlg.m_ofn.lpstrInitialDir=m_szDir; //初始目录 if( OpenDlg.DoModal() == IDOK) { strFilePath = OpenDlg.GetPathName(); } savefilename=strFilePath+"."+aboutfile; SetDlgItemText(IDC_PATH,savefilename);}4、开始下载按钮的消息映射函数：void CTestDlg::OnStart() { // TODO: Add your control notification handler code here CInternetSession aInternetSession; //一个会话 CHttpConnection* pHttpConnection = NULL; //链接 CHttpFile* pHttpFile = NULL; const TCHAR szHeaders[] = _T("Accept: */*\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)\r\n"); //协议 DWORD dwFileStatus; BYTE szBuffer[1024]; DWORD nLen; CFile aFile; DWORD nSuccess = -1; CString strServer; INTERNET_PORT nPort; CString strObject; DWORD dwServiceType; DWORD dwDownloadSize = 0; CString strLogs; //分解URL if(AfxParseURL(url, dwServiceType, strServer, strObject, nPort)) { //如果服务类型不是HTTP下载 if(dwServiceType != AFX_INET_SERVICE_HTTP && dwServiceType != AFX_INET_SERVICE_HTTPS) { return; } } while(pHttpConnection == NULL) pHttpConnection = aInternetSession.GetHttpConnection(strServer, nPort); if(pHttpConnection != NULL) { //取得HttpFile对象 pHttpFile = pHttpConnection->OpenRequest(CHttpConnection::HTTP_VERB_GET, strObject, NULL, 1, NULL, NULL, INTERNET_FLAG_RELOAD | INTERNET_FLAG_DONT_CACHE); if(pHttpFile != NULL) if(pHttpFile->AddRequestHeaders(szHeaders)) { if(pHttpFile->SendRequest()) //发送文件请求 { if(pHttpFile->QueryInfoStatusCode(dwFileStatus))//查询文件状态 { if ((dwFileStatus/100)*100 == HTTP_STATUS_OK)//如果文件状态正常 { if(aFile.Open(savefilename, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary)) //打开文件 { DWORD dwFileLen; DWORD dwWordSize = sizeof(dwFileLen); pHttpFile->QueryInfo(HTTP_QUERY_FLAG_NUMBER|HTTP_QUERY_CONTENT_LENGTH,&dwFileLen,&dwWordSize,NULL); nLen = pHttpFile->Read(szBuffer, 1024);//接收数据 while(nLen >= 1024)//接收文件数据每次接收一个块 { if(nLen > 0)//如果接收到数据 aFile.Write(szBuffer, nLen); //写入文件 nLen = pHttpFile->Read(szBuffer, 1024);//接收一个块的数据 } if(nLen > 0)//如果接收到数据 { aFile.Write(szBuffer, nLen);//写入文件 dwDownloadSize += nLen; } aFile.Close();//关闭文件 nSuccess = 0;//设置成功标志 AfxMessageBox("下载完成"); } } } } delete pHttpFile; } delete pHttpConnection;//删除http连接对象 } aInternetSession.Close();//关闭http连接 }
转载于:https://www.cnblogs.com/shenchao/archive/2013/03/02/2940955.html
相关资源：VC编程实现使用WinInet通过HTTP协议读取网上文件--useful