P2P网络通讯程序(c#)
2009-03-27 08:22:11 来源:WEB开发网b、MassTextPacket.cs --分片传输类
[Serializable()]
public class MassTextPacket:TextPacket
{
private int seqID;
/// <summary>
/// 包序列
/// </summary>
public int SeqID
{
get { return seqID; }
set { seqID = value; }
}
private int seqCount;
/// <summary>
/// 包数量
/// </summary>
public int SeqCount
{
get { return seqCount; }
set { seqCount = value; }
}
private int _CLSD;
public int CLSD
{
get { return _CLSD; }
set { _CLSD = value; }
}
}
2、客户端
a、消息传送时进行p2p通讯
private bool SendMessageTo(string toUserName, Packet packet)
{
PeerEntity toUser = userList.Single(c => c.UserName == toUserName);
if (toUser == null)
{
return false;
}
ReceivedACK = false;
for (int i=0; i<MAXRETRY; i++)
{
// 如果对方P2P地址不为0,就试图以它为目的地址发送数据,
// 如果发送失败,则认为此P2P地址无效
if (toUser.P2PAddress != null && toUser.P2PAddress.Port != 0)
{
if (packet.GetType() == typeof(TextPacket))
{
TextPacket msgPacket = new TextPacket(toUserName, (packet as TextPacket).Message);
byte[] buffer = UtilityHelper.Serialize(msgPacket);
if (buffer.Length > MAXBUFFERSIZE)
{
MassTextPacket mtp = new MassTextPacket();
mtp.SeqID = 0;
mtp.SeqCount = (int)System.Math.Ceiling(buffer.Length / (decimal)MAXBUFFERSIZE);
mtp.CLSD = mtp.GetHashCode();
long pos = 0;
long count = buffer.Length < MAXBUFFERSIZE ? buffer.Length : MAXBUFFERSIZE;
while (pos < buffer.Length && pos > 0)
{
byte[] bytes = new byte[count]; ;
for (int k = 0; k < count; k++)
bytes[k] = buffer[pos + k];
//数据组包
mtp.SeqID = mtp.SeqID + 1;
mtp.Message = Convert.ToBase64String(bytes);
//发送数据
byte[] buf = UtilityHelper.Serialize(mtp);
client.Send(buf, buf.Length, toUser.P2PAddress);
Thread.Sleep(100);
}
}
else
client.Send(buffer, buffer.Length, toUser.P2PAddress);
}
else if (packet.GetType() == typeof(FileStreamPacket))
{
FileStreamPacket fsp = packet as FileStreamPacket;
System.IO.FileStream fs = new System.IO.FileStream(fsp.FileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, FileShare.Read);
handle1.Reset();
fsp.SeqID = 0;
fsp.SeqCount = (int)System.Math.Ceiling(fs.Length / (decimal)MAXBUFFERSIZE);
fsp.CLSD = fsp.GetHashCode();
long pos = 0;
long count = fs.Length < MAXBUFFERSIZE ? fs.Length : MAXBUFFERSIZE;
while (pos < fs.Length && count > 0)
{
byte[] buffer = new byte[count];
fs.Seek(pos, SeekOrigin.Begin);
fs.Read(buffer, 0, (int)count);
pos += count;
count = pos + MAXBUFFERSIZE < fs.Length ? MAXBUFFERSIZE : fs.Length - pos;
//数据组包
fsp.SeqID = fsp.SeqID + 1;
fsp.Message = Convert.ToBase64String(buffer);
//发送数据
byte[] buf = UtilityHelper.Serialize(fsp);
client.Send(buf, buf.Length, toUser.P2PAddress);
Thread.Sleep(300);
}
handle1.Set();
}
// 等待接收线程将标记修改
for (int j = 0; j < 10; j++)
{
if (this.ReceivedACK)
{
this.ReceivedACK = false;
return true;
}
else
{
Thread.Sleep(300);
}
}
}
// 构建P2P打洞封包
// 然后通过服务器转发,请求对方向自己打洞
P2PConnectionPacket transMsg = new P2PConnectionPacket(UserName, toUserName);
byte[] msgBuffer = UtilityHelper.Serialize(transMsg);
client.Send(msgBuffer, msgBuffer.Length, hostPoint);
// 等待对方的P2PCONNECTACK消息
for(int j = 0; j < 10; ++j)
{
toUser = userList.Single(c => c.UserName == toUserName);
if ( toUser.P2PAddress != null && toUser.P2PAddress.Port != 0)
break;
Thread.Sleep(300);
}
}
return false;
}
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