private void button1_Click(object sender, EventArgs e)
{
//创建监听线程
// Create a TCPListener to accept client connections
TcpListener listener = new TcpListener(IPAddress.Any, _port);
listener.Start();
TcpClient client = listener.AcceptTcpClient(); // Get client connection
NetworkStream clientStream = client.GetStream();
//BinaryReader br = new BinaryReader(clientStream);
byte[] pathBytes = new byte[client.ReceiveBufferSize];
int bytesRead = clientStream.Read(pathBytes, 0, client.ReceiveBufferSize);
_path = Encoding.UTF8.GetString(pathBytes, 0, bytesRead);
//BinaryReader src = new BinaryReader(new BufferedStream(client.GetStream()));
//int stringLength = src.Read(); // Returns an unsigned byte as an int
//if (stringLength == -1)
// throw new EndOfStreamException();
//byte[] stringBuf = new byte[stringLength];
//src.Read(stringBuf, 0, stringLength);
//拿到文件路径，判断存在性
//_path = System.Text.Encoding.Default.GetString(pathBytes);
label1.Text = _path;
if (File.Exists(_path))
{
//文件存在，需要返回命令帧
Mode.ServerCmd serverCmd = new Mode.ServerCmd();
//文件存在
serverCmd.IsExist = true;
//获取文件大小
System.IO.FileInfo f = new FileInfo(_path);
serverCmd.Length = f.Length;
//发送给客户端，写一个同样大小的空文件，以dat结尾作调试用
byte[] bytesToSend = Convertor.StructToBytes(serverCmd);
client.GetStream().Write(bytesToSend, 0, bytesToSend.Length);
//服务器收到从客户端传来的准备好的消息
Mode.ClientCmd clientCmd = new Mode.ClientCmd();
byte[] structBytes = new byte[client.ReceiveBufferSize];
clientStream.Read(structBytes, 0, client.ReceiveBufferSize);
Mode.ClientCmd cmdFromClient = (Mode.ClientCmd)Convertor.BytesToStruct(structBytes, clientCmd.GetType());
//测试是否准备好——客户端已经建好空文件，记得校验md5
//MessageBox.Show(cmdFromClient.IsReady.ToString());
//开始发送数据
//1.创建一个预指令
Mode.PreData preData = new Mode.PreData();
//文件剩余传输量
preData.Left = serverCmd.Length;
//每次传输量
preData.Period = 1024;
//文件对象
FileStream fs = new FileStream(_path, FileMode.Open, FileAccess.Read);
//读文件，从当前位置开始
//当前位置为0
int curPos = 0;
while (preData.Left > 0)
{
clientStream.Read(structBytes, 0, client.ReceiveBufferSize);
cmdFromClient = (Mode.ClientCmd)Convertor.BytesToStruct(structBytes, clientCmd.GetType());
//客户端准备好接收数据
if (cmdFromClient.IsReady)
{
//命令字节数组
//byte[] cmdBytes = Convertor.StructToBytes(preData);
//如果剩余量比每次传输的片段值大，证明还可以按原来的量传输
if (preData.Left > preData.Period)
{
//本次传送完成后剩余文件大小
preData.Left -= preData.Period;
//命令字节数组
byte[] cmdBytes = Convertor.StructToBytes(preData);
byte[] periodbytes = new byte[preData.Period];
//文件大小超过4G要怎么办？？？暂时先取int的范围
fs.Read(periodbytes, 0, periodbytes.Length);
//文件流现在在periodbytes里面，和命令拼接后发送给客户端
string tmp = Encoding.UTF8.GetString(periodbytes);
byte[] sumBytes = new byte[cmdBytes.Length + periodbytes.Length];
System.Buffer.BlockCopy(cmdBytes, 0, sumBytes, 0, cmdBytes.Length);
System.Buffer.BlockCopy(periodbytes, 0, sumBytes, cmdBytes.Length, periodbytes.Length);
//将拼接后的字节数组发出去
client.GetStream().Write(sumBytes, 0, sumBytes.Length);
client.GetStream().Flush();
//更新当前位置
curPos += preData.Period;
fs.Position = curPos;
}
else
{
//传差量
preData.Period = (int)preData.Left;
//本次传送完成后剩余文件大小
preData.Left -= preData.Period;
//命令字节数组
byte[] cmdBytes = Convertor.StructToBytes(preData);
byte[] periodbytes = new byte[preData.Period];
fs.Read(periodbytes, 0, periodbytes.Length);
//写完了
//文件流现在在periodbytes里面，和命令拼接后发送给客户端
byte[] sumBytes = new byte[cmdBytes.Length + periodbytes.Length];
System.Buffer.BlockCopy(cmdBytes, 0, sumBytes, 0, cmdBytes.Length);
System.Buffer.BlockCopy(periodbytes, 0, sumBytes, cmdBytes.Length, periodbytes.Length);
//将拼接后的字节数组发出去
string tmp = Encoding.UTF8.GetString(periodbytes);
curPos += preData.Period;
client.GetStream().Write(sumBytes, 0, sumBytes.Length);
client.GetStream().Flush();
fs.Position = curPos;
}
}
}
//关闭文件
fs.Close();
MessageBox.Show("传输完成！");
//MessageBox.Show("文件存在");
}
else
{
MessageBox.Show("无此文件");
}
client.Close();
listener.Stop();
}
