How to use Emit with callback? about socket.io-client-csharp

[doghappy]

Case 1 works

Let's check the server code

    socket.on("v1/chat/enter", (msg2) => {
        console.log("v1");
        console.log(`${msg2.toString()}`);
        const binaryMessage2 = Buffer.from(msg2.toString() + " - server", "utf-8");
        socket.emit("v1/chat/enter", binaryMessage2);
    });

socket.emit("v1/chat/enter", binaryMessage2); means that the server emits an event to the client, In this case, you need to use client.On("v1/chat/enter", reponseaction); to listen to this event.

Case 2 does not work

await client.EmitAsync("v1/chat/enter", reponseaction, Encoding.UTF8.GetBytes(Test));

It means that the server passes some parameters to the client, and when the client receives them, reponseaction will be called.

Usually it is used with the following code:

Server

    socket.on("v1/chat/enter", (msg2, fn) => {
        console.log("v1");
        console.log(`${msg2.toString()}`);
        const binaryMessage2 = Buffer.from(msg2.toString() + " - server", "utf-8");
        fn(binaryMessage2);
    });

Choose one of the following two ways:

1:

// server
socket.on("v1/chat/enter", (msg2) => {
    console.log("v1");
    console.log(`${msg2.toString()}`);
    const binaryMessage2 = Buffer.from(msg2.toString() + " - server", "utf-8");
    socket.emit("v1/chat/enter", binaryMessage2);
});

// client
client.On("v1/chat/enter", reponseaction);
await client.EmitAsync("v1/chat/enter", Encoding.UTF8.GetBytes(Test));

2:

// server
socket.on("v1/chat/enter", (msg2, fn) => {
    console.log("v1");
    console.log(`${msg2.toString()}`);
    const binaryMessage2 = Buffer.from(msg2.toString() + " - server", "utf-8");
    fn(binaryMessage2);
});

// client
await client.EmitAsync("v1/chat/enter", reponseaction, Encoding.UTF8.GetBytes(Test));