Пример #1
0
        // 功能:获取下载文件的大小
        // 参数:url - 网络URL地址
        //       nFileSize - 输出文件的大小
        // 返回值:返回true表示得到了文件的大小,URL地址有效; 返回false表示无法得到文件的信息
        // 说明:这个接口是阻塞模式的,请不要在主线程调用
        static public bool GetDownFileSize(string url, out int nOutFileSize, long nRandSeed = 0)
        {
            nOutFileSize = 0;

            CHttp  http = new CHttp(nRandSeed);
            string szServerIP = string.Empty, szObj = string.Empty;
            int    nPort = 80;

            http.ParseURL(url, ref szServerIP, ref szObj, ref nPort);

            string szAnswer = string.Empty;

            if (!http.QueryFile(ref szAnswer, szServerIP, nPort, szObj, 0, 1, false))
            {
                http.Close();
                return(false);
            }
            int nDownSize = 0, nFileSize = 0;

            if (!http.AnlyseFileLengthFromAnswer(szAnswer, ref nDownSize, ref nFileSize))
            {
                http.Close();
                return(false);
            }
            http.Close();
            nOutFileSize = nFileSize;
            return(true);
        }
Пример #2
0
        // 功能:下载整个文件
        // 说明:这个接口是阻塞模式的,请不要在主线程调用
        static public bool DownFile(string url, out byte[] szFileData, int nDownOffset = 0, int nNeedDownSize = 0, long nRandSeed = 0, LPOnReceiveDownFile lpReceiveFunc = null)
        {
            szFileData = null;
            CHttp  http = new CHttp(nRandSeed);
            string szServerIP = string.Empty, szObj = string.Empty;
            int    nPort = 80;

            http.ParseURL(url, ref szServerIP, ref szObj, ref nPort);

            string szAnswer = string.Empty;

            if (!http.QueryFile(ref szAnswer, szServerIP, nPort, szObj, nDownOffset, nNeedDownSize, nNeedDownSize <= 0))
            {
                http.Close();
                return(false);
            }
            int nDownSize = 0, nFileSize = 0;

            if (!http.AnlyseFileLengthFromAnswer(szAnswer, ref nDownSize, ref nFileSize))
            {
                http.Close();
                return(false);
            }
            nDownSize = nFileSize;
            byte[] szTempBuf = null;

            szFileData = new byte[nFileSize];

            int nRecTotal = 0;
            int nRecLen   = 0;
            int nOffset   = 0;

            while (nRecTotal < nDownSize)
            {
                nRecLen = http.FastReceiveMax(ref szTempBuf, ref nOffset);
                // 写入文件吧
                if (nRecLen > 0)
                {
                    if (lpReceiveFunc != null)
                    {
                        lpReceiveFunc(nRecLen);
                    }
                    Array.Copy(szTempBuf, nOffset, szFileData, nRecTotal, nRecLen);
                    nRecTotal += nRecLen;
                }
                else
                {
                    break;
                }
            }
            http.Close();
            return(nRecTotal == nDownSize);
        }
Пример #3
0
        static bool     GetInetURL(string pcsURL, ref string szOutURL)
        {
            // 提取服务器的网址
            string szURL = pcsURL;

            if (szURL.IndexOf("http://", 0) != 0)
            {
                szURL = "http://" + szURL;
            }
            string szSerIP = GetMiddle(szURL, "http://", "/");

            string szObj  = string.Empty;
            int    nIndex = szURL.IndexOf('/', 6 + szSerIP.Length);

            if (nIndex != -1)
            {
                szObj = szURL.Substring(nIndex); // 必须有'/'
            }
            else
            {
                return(false);
            }

            int nServerPort = 80;

            nIndex = szSerIP.IndexOf(':', 0);
            if (nIndex != -1)
            {
                nServerPort = DistillNumb(szSerIP, nIndex + 1);
                szSerIP     = szSerIP.Substring(0, nIndex);
            }

            // 连接服务器
            CHttp tcpURL = new CHttp();

            if (!tcpURL.ClientOpen(szSerIP, nServerPort))
            {
                return(false);          // 无法连接服务器
            }

            // 格式化消息头
            StringBuilder szBuilder = new StringBuilder(512);

            ///第1行:方法,请求的路径,版本
            szBuilder.AppendFormat("GET {0} HTTP/1.1\r\n", szObj);
            ///第2行:主机
            szBuilder.AppendFormat("Host:{0}\r\n", szSerIP);
            ///第3行: 引用网址
            //szMsg.AppendFormat( "Referer:%s\r\n", szObj );

            ///第4行:接收的数据类型
            szBuilder.Append("Accept:*/*\r\n");
            ///第5行:浏览器类型
            szBuilder.Append("User-Agent:Mozilla/6.0 (compatible; MSIE 6.00; Android)\r\n");
            ///第6行:连接设置,保持
            //szMsg.AppendFormat( "Connection:Keep-Alive\r\n" );
            szBuilder.Append("Connection:close\r\n");
            szBuilder.Append("Range: bytes=0-0\r\n");
            szBuilder.Append("\r\n");

            string szMsg = szBuilder.ToString();

            tcpURL.SendToServer(szMsg);
            byte   [] chBuf         = new byte[1];
            char   [] szTotalRecBuf = new char[1024]; // 应该不会这么长吧
            int       nTotalRecLen  = 0;
            int       nStart        = 0;

            while (true)
            {
                int nRecLen = tcpURL.ReceiveChar(chBuf, 1024);
                if (nRecLen <= 0)
                {
                    break;
                }
                if (nTotalRecLen + nRecLen > szTotalRecBuf.Length)
                {
                    char  [] szNewBuf = new char[nTotalRecLen * 2];
                    Array.Copy(szTotalRecBuf, 0, szNewBuf, 0, nTotalRecLen);
                    szTotalRecBuf = szNewBuf;
                }
                szTotalRecBuf[nTotalRecLen++] = (char)chBuf[0];
                nTotalRecLen += 1;

                if (FindHttpMsgEndFlags(szTotalRecBuf, nTotalRecLen, ref nStart))
                {
                    break;
                }
            }
            tcpURL.Close();

            szTotalRecBuf[nTotalRecLen] = '\0';
            string szAnswer = new string(szTotalRecBuf, 0, nTotalRecLen);

            // 分析
            szOutURL = GetMiddle(szAnswer, "Location:", "\r\n");
            szOutURL = szOutURL.Trim();
            tcpURL.Close();
            return(szOutURL.Length > 0);
        }
Пример #4
0
        // 功能:下载文件,并将下载的文件保存到本地
        // 参数:url - 网络URL的地址
        //       szLocalPathName - 本地保存地址
        // 说明:这个接口是阻塞模式的,请不要在主线程调用
        static public bool DownFile(string url, string szLocalPathName, int nNeedDownOffset, int nNeedDownSize, long nRandSeed = 0, LPOnReceiveDownFile lpReceiveFunc = null)
        {
            CHttp  http = new CHttp(nRandSeed);
            string szServerIP = string.Empty, szObj = string.Empty;
            int    nPort = 80;

            http.ParseURL(url, ref szServerIP, ref szObj, ref nPort);

            string szAnswer = string.Empty;

            if (!http.QueryFile(ref szAnswer, szServerIP, nPort, szObj, nNeedDownOffset, nNeedDownSize, nNeedDownSize <= 0))
            {
                http.Close();
                return(false);
            }
            int nDownSize = 0, nFileSize = 0;

            if (!http.AnlyseFileLengthFromAnswer(szAnswer, ref nDownSize, ref nFileSize))
            {
                http.Close();
                return(false);
            }
            if (nNeedDownSize <= 0)
            {
                nDownSize = nFileSize;  // 这是全部下载
            }
            // 打开本地文件
            if (File.Exists(szLocalPathName))
            {
                File.Delete(szLocalPathName);
            }
            FileStream pFile = new FileStream(szLocalPathName, FileMode.CreateNew, FileAccess.Write);

            // 开始下载吧
            byte[] szTempBuf = null;

            int nRecTotal = 0;
            int nRecLen   = 0;
            int nOffset   = 0;

            while (nRecTotal < nDownSize)
            {
                nRecLen = http.FastReceiveMax(ref szTempBuf, ref nOffset);
                // 写入文件吧
                if (nRecLen > 0)
                {
                    if (lpReceiveFunc != null)
                    {
                        lpReceiveFunc(nRecLen);
                    }
                    nRecTotal += nRecLen;
                    pFile.Write(szTempBuf, nOffset, nRecLen);
                }
                else
                {
                    break;
                }
            }
            http.Close();
            pFile.Close();
            return(nRecTotal == nDownSize);
        }