/// <summary> /// 服务端: /// </summary> /// <param name="FileName">更新文件包名</param> /// <param name="Offset">偏移</param> /// <param name="Count">每次读取字节数 单位KB</param> /// <returns>字节组</returns> [WebMethod(Description = "<b>大文件下载</b> 测试")] public byte[] getFile(string FileName, long Offset, int Count) { //指定下载文件夹+文件名 string strPath = @"E:\" + FileName; if (Offset < 0) { Offset = 0; } byte[] btBuf = new byte[Count]; if (System.IO.File.Exists(strPath)) { System.IO.FileStream fs = new System.IO.FileStream(strPath, System.IO.FileMode.Open); if (Offset < fs.Length) { if (0 < (int)(fs.Length - Offset) && (int)(fs.Length - Offset) < Count) { Count = (int)(fs.Length - Offset); } btBuf=new byte[Count]; fs.Seek(Offset, System.IO.SeekOrigin.Begin); fs.Read(btBuf, 0, Count); } else { btBuf = null; } fs.Flush(); fs.Close(); fs.Dispose(); } return btBuf; }
///客户端调用
private string DownLoadPath(string strClientFilePath, string fileName) { string result = ""; ws1.Service s1 = new ws1.Service(); //本地数据 System.IO.FileStream ns; //文件保存路径 string strPath = strClientFilePath + @"" + fileName; //源文件名 string serverFileName = @"Enterprise.msi"; //传输数据长度,每次取字节组大小 int count = 1024 * 100; 大文件发送 //申请内存,存放取回的数据 byte[] buffer = new byte[count]; //文件偏移 long offset = 0; //取回数据字节长度 int bufferSize = 1; //------------- while (bufferSize > 0) { //读取本地文件信息 ns = new System.IO.FileStream(strPath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite); //获取本地数据长度,设定从服务器取数据偏移指针位置 offset = ns.Length; //取服务端数据 buffer = s1.getFile(serverFileName, offset, count); if (buffer!=null) { ns.Seek(offset, System.IO.SeekOrigin.Begin); count = buffer.Length; ns.Write(buffer, 0, count); } else { bufferSize = -1; result = "Successful !"; } ns.Flush(); ns.Close(); ns.Dispose(); } return result; }
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