RakNet发送与接收数据-优快云博客

本文介绍了使用RakNet库中的Bitstream进行网络数据包创建与解析的方法。通过实例展示了如何利用Bitstream来减少数据传输量，包括写入消息ID、时间戳及对象属性等步骤，并提供了接收端的数据读取过程。

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http://www.jenkinssoftware.com/raknet/manual/creatingpackets.html

Creating Packets with Bitstreams

Write less data with bitstreams

Lets take our mine example above and use a bitstream to write it out instead. We have all the same data as before.

MessageID useTimeStamp; // Assign this to ID_TIMESTAMP
RakNet::Time timeStamp; // Put the system time in here returned by RakNet::GetTime()
MessageID typeId; // This will be assigned to a type I've added after ID_USER_PACKET_ENUM, lets say ID_SET_TIMED_MINE
useTimeStamp = ID_TIMESTAMP;
timeStamp = RakNet::GetTime();
typeId=ID_SET_TIMED_MINE;
Bitstream myBitStream;
myBitStream.Write(useTimeStamp);
myBitStream.Write(timeStamp);
myBitStream.Write(typeId);
// Assume we have a Mine* mine object
myBitStream.Write(mine->GetPosition().x);
myBitStream.Write(mine->GetPosition().y);
myBitStream.Write(mine->GetPosition().z);
myBitStream.Write(mine->GetNetworkID()); // In the struct this is NetworkID networkId
myBitStream.Write(mine->GetOwner()); // In the struct this is SystemAddress systemAddress

Common mistake!
When writing the first byte to a bitstream, be sure to cast it to (MessageID) or (unsigned char). If you just write the enumeration directly you will be writing a full integer (4 bytes).
Right:
bitStream->Write((MessageID)ID_SET_TIMED_MINE);

Wrong:
bitStream->Write(ID_SET_TIMED_MINE);

In the second case, RakNet will see the first byte is 0, which is reserved internally to ID_INTERNAL_PING, and you will never get it.

http://www.jenkinssoftware.com/raknet/manual/receivingpackets.html
void DoMyPacketHandler(Packet *packet)
{
	Bitstream myBitStream(packet->data, packet->length, false); // The false is for efficiency so we don't make a copy of the passed data
	myBitStream.Read(useTimeStamp);
	myBitStream.Read(timeStamp);
	myBitStream.Read(typeId);
	myBitStream.Read(x);
	myBitStream.Read(y);
	myBitStream.Read(z);
	
	myBitStream.Read(networkID); // In the struct this is NetworkID networkId
	myBitStream.Read(systemAddress); // In the struct this is SystemAddress systemAddress
}

转载于:https://www.cnblogs.com/coolbear/p/6214294.html