/// <summary>
/// 接收方发送确认序号
/// </summary>
/// <param name="ack">下一个等待接收的序号</param>
private void sendAck(uint ack)
{
ProtocalHandler protocalHandler =
new ProtocalHandler(owner.targetName);
try
{
// 封装协议文本
string protocalText = protocalHandler.Pack("file_ack");
protocalText =
protocalHandler.Append(protocalText, "file", safeFileNameBase64);
protocalText =
protocalHandler.Append(protocalText, "ack", ack.ToString());
// 发送
byte[] sendbuf = Encoding.ASCII.GetBytes(protocalText);
SocketAsyncEventArgs saEA = new SocketAsyncEventArgs();
saEA.Completed +=
new EventHandler <SocketAsyncEventArgs>(
SendCompletedDoNothing);
saEA.SetBuffer(sendbuf, 0, sendbuf.Length);
socket.SendAsync(saEA);
}
catch (Exception ex)
{
Trace.WriteLine("异常位置：sendAck");
Trace.WriteLine(ex.Message);
}
}
/// <summary>
/// 发送方：
/// 发送文件的某个片段
/// </summary>
/// <param name="seq">当前序号</param>
private void sendingFilePack(uint seq)
{
ProtocalHandler protocalHandler =
new ProtocalHandler(owner.targetName);
// 封装协议文本
string protocalText = protocalHandler.Pack("file_data");
protocalText =
protocalHandler.Append(protocalText, "file", safeFileNameBase64);
protocalText =
protocalHandler.Append(protocalText, "seq", seq.ToString());
uint len = FilePacker.BytesOfPack;
if (seq == maxSeq - 1)
{
len = filePacker.GetSizeOfLastPack();
}
protocalText =
protocalHandler.Append(protocalText, "len", len.ToString());
// 文件内容
byte[] buf = filePacker.GetPack(seq);
string dataBase64 = Convert.ToBase64String(buf, 0, (int)len);
protocalText =
protocalHandler.Append(protocalText, "data", dataBase64);
int checksum = 0;
for (int i = 0; i < len; i++)
{
checksum += buf[i];
}
checksum = -checksum;
protocalText =
protocalHandler.Append(protocalText, "checksum",
checksum.ToString());
try
{
// 发送
byte[] sendbuf = Encoding.ASCII.GetBytes(protocalText);
SocketAsyncEventArgs saEA = new SocketAsyncEventArgs();
saEA.Completed +=
new EventHandler <SocketAsyncEventArgs>(
SendCompletedDoNothing);
saEA.SetBuffer(sendbuf, 0, sendbuf.Length);
socket.SendAsync(saEA);
}
catch (Exception ex)
{
Trace.WriteLine("异常位置：SendingFilePack");
Trace.WriteLine(ex.Message);
}
}
/// <summary>
/// 发起方：
/// 成功建立Socket连接，准备发送1次确认
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void createSocketCompletedEventHandler(
object sender, EventArgs ea)
{
// 取得新建的Socket（如果连接成功）
// 此Socket应等于this.socket
SocketAsyncEventArgs socketAsyncEA = (SocketAsyncEventArgs)ea;
Socket createdSocket = socketAsyncEA.ConnectSocket;
if (createdSocket != null && createdSocket == socket) // 连接成功
{
// 1次确认，发送name=自己（发起方）用户名
ProtocalHandler protocalHandler =
new ProtocalHandler(main.MyName);
string protocalText = protocalHandler.Pack("init_gp_request");
// 发送群中所有好友
foreach (string friend in owner.friends)
{
string friendBase64 =
protocalHandler.StringToBase64string(friend);
protocalText = protocalHandler.Append(
protocalText, "target", friendBase64);
}
byte[] sendbuf = Encoding.ASCII.GetBytes(protocalText);
SocketAsyncEventArgs saEA = new SocketAsyncEventArgs();
saEA.Completed +=
new EventHandler <SocketAsyncEventArgs>(
createdSocketSendNamesCompletedEventHandler);
saEA.SetBuffer(sendbuf, 0, sendbuf.Length);
socket.SendAsync(saEA);
}
}
/// <summary>
/// 接受方：
/// 同意接收文件
/// </summary>
public void ClearToSendFile()
{
ProtocalHandler protocalHandler =
new ProtocalHandler(owner.targetName);
// 封装协议文本
string protocalText = protocalHandler.Pack("file_cleartosend");
protocalText =
protocalHandler.Append(protocalText, "file", safeFileNameBase64);
try
{
fileWriter = new FileWriter(owner.fileName);
// 发送
byte[] sendbuf = Encoding.ASCII.GetBytes(protocalText);
SocketAsyncEventArgs saEA = new SocketAsyncEventArgs();
saEA.Completed +=
new EventHandler <SocketAsyncEventArgs>(
SendCompletedDoNothing);
saEA.SetBuffer(sendbuf, 0, sendbuf.Length);
socket.SendAsync(saEA);
}
catch (Exception ex)
{
Trace.WriteLine("异常位置：ClearToSendFile");
Trace.WriteLine(ex.Message);
}
sendTimeOutTimer.Start();
sendErrCount = 0;
}
/// <summary>
/// 接受方：
/// 收到的1次确认为私聊，记录对方的身份信息
/// 此时确定owner
/// 发送2次确认
/// </summary>
/// <param name="protocalHandler">接收到的协议的封装</param>
public void newSocketChatNameReceived(ProtocalHandler protocalHandler)
{
try
{
// 对方用户名
string targetNameBase64 =
protocalHandler.GetElementTextByTag("name");
string targetName =
protocalHandler.Base64stringToString(targetNameBase64);
// 打开私聊窗口
main.SetChatFormClient(this, targetName);
// 2次确认，发送you = 对方（发起方）用户名
string protocalText = protocalHandler.Pack("init_chat_ok");
protocalText = protocalHandler.Append(
protocalText, "you", targetNameBase64);
byte[] sendbuf = Encoding.ASCII.GetBytes(protocalText);
SocketAsyncEventArgs saEA = new SocketAsyncEventArgs();
saEA.Completed +=
new EventHandler <SocketAsyncEventArgs>(
newSocketUsernameSendEventHandler);
saEA.SetBuffer(sendbuf, 0, sendbuf.Length);
socket.SendAsync(saEA);
}
catch (Exception ex)
{
Trace.WriteLine("异常位置：" +
"newSocketChatNameReceived");
Trace.WriteLine(ex.Message);
CloseSocket();
}
}
/// <summary>
/// 发起方：
/// 申请发送文件
/// </summary>
/// <param name="fileName">文件名（含路径）</param>
public void RequestToSendFile(string fileName)
{
// 打开文件
filePacker = new FilePacker(owner.fileName);
maxSeq = filePacker.GetPackNumbers();
owner.BeginInvoke(owner.setProgressDelegate, (int)maxSeq);
// 取得文件名，并将文件名编码以便使用
safeFileNameBase64 = owner.GetSafeFileName(fileName);
ProtocalHandler protocalHandler =
new ProtocalHandler(owner.targetName);
safeFileNameBase64 = protocalHandler.StringToBase64string(safeFileNameBase64);
// 封装协议文本
string protocalText = protocalHandler.Pack("file_requesttosend");
protocalText =
protocalHandler.Append(protocalText, "file", safeFileNameBase64);
protocalText =
protocalHandler.Append(protocalText, "maxseq", maxSeq.ToString());
try
{
// 发送
byte[] sendbuf = Encoding.ASCII.GetBytes(protocalText);
SocketAsyncEventArgs saEA = new SocketAsyncEventArgs();
saEA.Completed +=
new EventHandler <SocketAsyncEventArgs>(
SendCompletedDoNothing);
saEA.SetBuffer(sendbuf, 0, sendbuf.Length);
socket.SendAsync(saEA);
}
catch (Exception ex)
{
Trace.WriteLine("异常位置：RequestToSendFile");
Trace.WriteLine(ex.Message);
}
}