/// <summary>
/// 从指定的网络流中获取数据并写入到输出流中。
/// </summary>
/// <param name="networkStream">与客户端连接的网络流。</param>
/// <param name="dataSize">指定要读取的数据最大大小。</param>
/// <param name="outputStream">数据输出流。</param>
/// <param name="bufferSize">设置允许使用的缓冲区最大大小。</param>
/// <param name="transferSizeChanged">已经传输的数据大小更改时引发此事件。设置为 null 则忽略此参数。</param>
/// <returns>实际接收到的数据大小。</returns>
public static long ReadDataFromNetwork(System.Net.Sockets.NetworkStream networkStream, long dataSize, System.IO.Stream outputStream, int bufferSize, TransferPositionChangedHandler transferSizeChanged)
{
long tLen = 0;
byte[] buff = new byte[dataSize < bufferSize ? dataSize : bufferSize];
int len;
int tRead;
long rightSize; //剩余待传输的数据大小。
while (tLen < dataSize) // && networkStream.CanRead
{
rightSize = dataSize - tLen;
tRead = System.Convert.ToInt32(rightSize > buff.Length ? buff.Length : rightSize);
len = networkStream.Read(buff, 0, tRead);
if (len == 0)
{
break;
}
outputStream.Write(buff, 0, len);
tLen += len;
if (transferSizeChanged != null)
{
TransferPositionChangedEventArgs e = new TransferPositionChangedEventArgs(outputStream.Position);
transferSizeChanged(e);
if (e.AbortTransfer)
{
break;
}
}
}
return(tLen);
}
/// <summary>
/// 以指定的发送规则发送数据到指定的网络流，数据来自输入流“inputStream”。
/// </summary>
/// <param name="networkStream">与客户端连接的网络流。</param>
/// <param name="inputStream">数据输入流。</param>
/// <param name="sleep">发送数据间隔时间。</param>
/// <param name="dataSize">每次发送数据包大小。</param>
/// <param name="firstDataSize">首次发送数据包大小。</param>
/// <param name="transferSizeChanged">已经传输的数据大小更改时引发此事件。设置为 null 则忽略此参数。</param>
/// <returns>实际发送的数据大小。</returns>
public static long WriteDataToNetwork(System.Net.Sockets.NetworkStream networkStream, System.IO.Stream inputStream, System.TimeSpan sleep, int dataSize, int firstDataSize, TransferPositionChangedHandler transferSizeChanged)
{
//if (!NetworkStream.CanWrite)
//{
// throw new System.Exception("网络文件流不支持写入操作。");
//}
//this.OutputLog("[IP=" + RemoteClient.RemoteIP.ToString() + ":" + RemoteClient.RemotePort.ToString() + "] 开始传送文件：" + FileName);
//if (!networkStream.CanWrite)
//{
// return;
//}
if (inputStream.Length < firstDataSize)
{
firstDataSize = System.Convert.ToInt32(inputStream.Length);
}
if (inputStream.Length < dataSize)
{
dataSize = System.Convert.ToInt32(inputStream.Length);
}
int bufferLength = dataSize > firstDataSize ? dataSize : firstDataSize;
byte[] buffer = new byte[bufferLength];
//if (!networkStream.CanWrite)
//{
// return;
//}
//try
//{
#region 开始写入数据。
long tLen = 0;
//long currentSize = inputStream.Position;
int len = inputStream.Read(buffer, 0, firstDataSize);
while (len != 0)
{
//if (!networkStream.CanWrite)
//{
// break;
//}
networkStream.Write(buffer, 0, len);
tLen += len;
//currentSize += len;
if (transferSizeChanged != null)
{
TransferPositionChangedEventArgs e = new TransferPositionChangedEventArgs(inputStream.Position);
transferSizeChanged(e);
if (e.AbortTransfer)
{
break;
}
}
if (sleep > System.TimeSpan.Zero)
{
//if (!networkStream.CanWrite)
//{
// break;
//}
System.Threading.Thread.Sleep(sleep);//控制每隔多长时间发送一次数据。
}
//if (!networkStream.CanWrite)
//{
// break;
//}
len = inputStream.Read(buffer, 0, bufferLength);
}
#endregion
//}
//catch (System.Threading.ThreadAbortException taex)
//{
// //this.OutputLog(taex.ToString());
//}
//catch (System.IO.IOException ioex)
//{
// /*此处 catch 用于截获下面的因属于正常的下载文件完成 IE 客户端先断开连接引发的异常：
// System.IO.IOException: 无法将数据写入传输连接: 远程主机强迫关闭了一个现有的连接。。 ---> System.Net.Sockets.SocketException: 远程主机强迫关闭了一个现有的连接。
// 在 System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
// 在 System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)
// --- 内部异常堆栈跟踪的结尾 ---
// 在 System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)
// 在 IEFileServer.Form1.SendFileToNetwork(String FileName, NetworkStream NetworkStream) 位置 D:\Documents and Settings\桌面\IEFileServer\IEFileServer\Form1.cs:行号 157
// */
// //this.OutputLog(ioex.ToString());
//}
//catch (System.ObjectDisposedException odex)
//{
// //this.OutputLog(odex.ToString());
//}
return(tLen);
}