[英]WebSockets - How to create different messages?
I am creating a websocket chat application and I managed to relay chat messages to other browsers connected. 我正在创建一个websocket聊天应用程序,并且设法将聊天消息中继到连接的其他浏览器。 I have a console application listening on one port.
我有一个控制台应用程序在一个端口上侦听。
My question is... If one person logs on to the system I want everybody to know that, how can I do that? 我的问题是...如果一个人登录到系统,我希望所有人都知道,我该怎么做? I'm using Linq to map the DB but if the logging is ok how do I send that message, that user X has logged in?
我正在使用Linq映射数据库,但是如果日志记录正常,我如何发送该消息,则该用户X已登录?
FINALLY I was able to create a chatroom using websockets, here is the final product, thanks for the orientation! 最终,我能够使用websockets创建聊天室,这是最终产品,感谢方向!
http://ukchatpoint.no-ip.org/Chatpoint/Pages/Uklobby.aspx http://ukchatpoint.no-ip.org/Chatpoint/Pages/Uklobby.aspx
First make sure you're sending messages as JSON (JavaScript Object Notation) as this allows structured data to be sent back and forth, and client & server can differentiate between a chat message and an instruction (eg someone new logged in). 首先,请确保您以JSON(JavaScript对象表示法)的形式发送消息,因为这允许来回发送结构化数据,并且客户端和服务器可以区分聊天消息和指令(例如,新登录的人)。 For instance on the client:
例如在客户端上:
mySocket.onmessage = function(event) {
var command = JSON.parse(event.data);
if(command.type === 'message') {
var message = command.message;
// handle chat message
}
else if (command.type === 'newUser') {
var username = command.username;
// handle new user
}
};
On the server in ASP.NET C# you'd send them as: 在ASP.NET C#的服务器上,您将其发送为:
public class ChatHandler : WebSocketHandler
{
private JavaScriptSerializer serializer = new JavaScriptSerializer();
private static WebSocketCollection chatapp = new WebSocketCollection();
public override void OnMessage(string message)
{
var m = serializer.Deserialize<Message>(message);
switch (m.Type)
{
case MessageType.NewUser:
chatapp.Broadcast(serializer.Serialize(new
{
type = "newUser",
username = m.username
}));
break;
case MessageType.Message:
chatapp.Broadcast(serializer.Serialize(new
{
type = "message",
message = m.message
}));
break;
default:
return;
}
}
}
As Hightechrider says, you'll need to keep track of a list of connected clients, that's what WebSocketCollection
class does in the code listing above. 就像Hightechrider所说的那样,您需要跟踪已连接客户端的列表,这就是
WebSocketCollection
类在上面的代码清单中所做的。
Check out Paul Batum's WebSocket chat example on github here ( https://github.com/paulbatum/BUILD-2011-WebSocket-Chat-Samples/blob/master/BasicAspNetChat/ChatHandler.cs ) 在github上查看Paul Batum的WebSocket聊天示例( https://github.com/paulbatum/BUILD-2011-WebSocket-Chat-Samples/blob/master/BasicAspNetChat/ChatHandler.cs )
Also he did a presentation at the recent MS BUILD conference here ( http://channel9.msdn.com/Events/BUILD/BUILD2011/SAC-807T ) 此外,他还在最近的MS BUILD会议( http://channel9.msdn.com/Events/BUILD/BUILD2011/SAC-807T )上做了演讲。
You would need to track the connections at the application level so you can send to all of them. 您需要在应用程序级别跟踪连接,以便可以发送给所有连接。 But take a look at SignalR instead where a lot of the work involved with webSockets and long polling is being written for you.
但是,请看一下SignalR ,那里正在为您编写许多与WebSocket和长时间轮询有关的工作。 With SignalR you can use
GetClients
to get all the clients connected to a Hub
. 使用SignalR,您可以使用
GetClients
来将所有客户端连接到Hub
。
使用PostgreSQL时,可以在数据库中使用NOTIFY来通知应用程序层,该应用程序层可以生成通过WebSockets发送的消息。
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