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Added new getting started guide

Thanks @MinnDevelopment for his awesome work on
the JDA guide that had no influence here at all.
tags/1.0-rc
Christopher F 8 years ago
parent
commit
d111214bff
13 changed files with 318 additions and 34 deletions
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@@ -11,7 +11,7 @@ Optionally, you may compile from source and install yourself.

Currently, Discord.Net targets [.NET Standard] 1.3, and offers support for
.NET Standard 1.1. If your application will be targeting .NET Standard 1.1,
please see the [additional steps](#installing-on-.net-standard-1.1).
please see the [additional steps](#installing-on-.net-standard-11).

Since Discord.Net is built on the .NET Standard, it is also recommended to
create applications using [.NET Core], though you are not required to. When
@@ -46,11 +46,13 @@ project
3. Right click on 'Dependencies', and select 'Manage NuGet packages'
![Step 3](images/install-vs-deps.png)
4. In the 'browse' tab, search for 'Discord.Net'

> [!TIP]
> Don't forget to change your package source if you're installing from the
> developer feed.
> Also make sure to check 'Enable Prereleases' if installing a dev build!
Don't forget to change your package source if you're installing from the
developer feed.
Also make sure to check 'Enable Prereleases' if installing a dev build!
5. Install the 'Discord.Net' package

![Step 5](images/install-vs-nuget.png)

## Using JetBrains Rider


+ 201
- 27
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@@ -2,49 +2,223 @@
title: Getting Started
---

# Getting Started
# Making a Ping-Pong bot

## Requirements
One of the first steps to getting started with the Discord API is to
write a basic ping-pong bot. We will expand on this to create more
diverse commands later, but for now, it is a good starting point.

Discord.Net supports logging in with all variations of Discord Accounts, however the Discord API reccomends using a `Bot Account`.
## Creating a Discord Bot

You may [register a bot account here](https://discordapp.com/developers/applications/me).
Before you can begin writing your bot, it is necessary to create a bot
account on Discord.

Bot accounts must be added to a server, you must use the [OAuth 2 Flow](https://discordapp.com/developers/docs/topics/oauth2#adding-bots-to-guilds) to add them to servers.
1. Visit the [Discord Applications Portal]
2. Create a New Application
3. Give the application a name (this will be the bot's initial
username).
4. Create the Application
![Step 4](images/intro-create-app.png)
5. In the application review page, click **Create a Bot User**
![Step 5](images/intro-create-bot.png)
6. Confirm the popup
7. If this bot will be public, check 'Public Bot'.
**Do not tick any other options!**

## Installation
[Discord Applications Portal]: https://discordapp.com/developers/applications/me

You can install Discord.Net 1.0 from our [MyGet Feed](https://www.myget.org/feed/Packages/discord-net).
## Adding your bot to a server

**For most users writing bots, install only `Discord.Net.WebSocket`.**
Bots **can not** use invite links, they must be explicitly invited
through the OAuth2 flow.

You may add the MyGet feed to Visual Studio directly from `https://www.myget.org/F/discord-net/api/v3/index.json`.
1. Open your bot's application on the [Discord Applications Portal]
2. Retrieve the app's **Client ID**.
![Step 2](images/intro-client-id.png)
3. Create an OAuth2 authorization URL
`https://discordapp.com/oauth2/authorize?client_id=<CLIENT ID>&scope=bot`
4. Open the authorization URL in your browser
5. Select a server

You can also pull the latest source from [GitHub](https://github.com/RogueException/Discord.Net).
>[!NOTE]
Only servers where you have the `MANAGE_SERVER` permission will be
present in this list.

6. Click authorize
![Step 6](images/intro-add-bot.png)

## Connecting to Discord

If you have not already created a project and installed Discord.Net,
do that now. (see the [Installing](installing.md) section)

### Async

Discord.Net uses .NET's Task-based Asynchronous Pattern ([TAP])
extensively - nearly every operation is asynchronous.

It is highly recommended that these operations be awaited in a
properly established async context whenever possible. Establishing an
async context can be problematic, but not hard.

To do so, we will be creating an async main in your console
application, and rewriting the static main method to invoke the new
async main.

[!code-csharp[Async Context](samples/intro/async-context.cs)]

As a result of this, your program will now start, and immidiately
jump into an async context. This will allow us later on to create a
connection to Discord, without needing to worry about setting up the
correct async implementation.

>[!TIP]
If your application throws any exceptions within an async context,
they will be thrown all the way back up to the first non-async method.
Since our first non-async method is the program's Main method, this
means that **all** unhandled exceptions will be thrown up there, which
will crash your application. Discord.Net will prevent exceptions in
event handlers from crashing your program, but any exceptions in your
async main **will** cause the application to crash.

>[!WARNING]
>The versions of Discord.Net on NuGet are behind the versions this
>documentation is written for.
>You MUST install from MyGet or Source!
### Creating a logging method

## Async
Before we create and configure a Discord client, we will add a method
to handle Discord.Net's log events.

Discord.Net uses C# tasks extensiely - nearly all operations return
one.
To allow agnostic support of as many log providers as possible, we
log information through a Log event, with a proprietary LogMessage
parameter. See the [API Documentation] for this event.

It is highly reccomended these tasks be awaited whenever possible.
To do so requires the calling method to be marked as async, which
can be problematic in a console application. An example of how to
get around this is provided below.
If you are using your own logging framework, this is where you would
invoke it. For the sake of simplicity, we will only be logging to
the Console.

For more information, go to [MSDN's Async-Await section.](https://msdn.microsoft.com/en-us/library/hh191443.aspx)
[!code-csharp[Async Context](samples/intro/logging.cs)]

## First Steps
### Creating a Discord Client

[!code-csharp[Main](samples/first-steps.cs)]
Finally, we can create a connection to Discord. Since we are writing
a bot, we will be using a [DiscordSocketClient], along with socket
entities. See the [terminology](terminology.md) if you're unsure of
the differences.

To do so, create an instance of [DiscordSocketClient] in your async
main, passing in a configuration object only if necessary. For most
users, the default will work fine.

Before connecting, we should hook the client's log event to the
log handler that was just created. Events in Discord.Net work
similarly to other events in C#, so hook this event the way that
you typically would.

Next, you will need to 'login to Discord' with the `LoginAsync` method.

You may create a variable to hold your bot's token (this can be found
on your bot's application page on the [Discord Applications Portal]).
![Token](images/intro-token.png)

>[!IMPORTANT]
Your bot's token can be used to gain total access to your bot, so
**do __NOT__ share this token with anyone!**. It may behoove you to
store this token in an external file if you plan on distributing the
source code for your bot.

We may now invoke the client's `StartAsync` method, which will
start connection/reconnection logic. It is important to note that
**this method returns as soon as connection logic has been started!**

Any methods that rely on the client's state should go in an event
handler.

>[!NOTE]
>In previous versions of Discord.Net, you had to hook into the `Ready` and `GuildAvailable` events to determine when your client was ready for use.
>In 1.0, the [ConnectAsync] method will automatically wait for the Ready event, and for all guilds to stream. To avoid this, pass `false` into `ConnectAsync`.
Connection logic is incomplete as of the current build. Events will
soon be added to indicate when the client's state is ready for use;
(rewrite this section when possible)

Finally, we will want to block the async main method from returning
until after the application is exited. To do this, we can await an
infinite delay, or any other blocking method, such as reading from
the console.

The following lines can now be added:

[!code-csharp[Create client](samples/intro/client.cs)]

At this point, feel free to start your program and see your bot come
online in Discord.

>[!TIP]
Encountering a `PlatformNotSupportedException` when starting your bot?
This means that you are targeting a platform where .NET's default
WebSocket client is not supported. Refer to the [installing guide]
for how to fix this.

[TAP]: https://docs.microsoft.com/en-us/dotnet/articles/csharp/async
[API Documentation]: xref:Discord.Rest.BaseDiscordClient#Discord_Rest_BaseDiscordClient_Log
[DiscordSocketClient]: xref:Discord.WebSocket.DiscordSocketClient
[installing guide]: installing.md#installing-on-.net-standard-11

### Handling a 'ping'

Now that we have learned how to open a connection to Discord, we can
begin handling messages that users are sending.

To start out, our bot will listen for any message where the content
is equal to `!ping`, and respond back with `Pong!`.

Since we want to listen for new messages, the event to hook in to
is [MessageReceived].

In your program, add a method that matches the signature of the
MessageReceived event - it must be a method (`Func`) that returns the
type `Task`, and takes a single parameter, a [SocketMessage]. Also,
since we will be sending data to Discord in this method, we will flag
it as `async`.

In this method, we will add an `if` block, to determine if the message
content fits the rules of our scenario - recall that it must be equal
to `!ping`.

Inside the branch of this condition, we will want to send a message
back to the channel from which the message came - `Pong!`. To find the
channel, look for the `Channel` property on the message parameter.

Next, we will want to send a message to this channel. Since the
channel object is of type [SocketMessageChannel], we can invoke the
`SendMessageAsync` instance method. For the message content, send back
a string containing 'Pong!'.

You should have now added the following lines:

[!code-csharp[Message](samples/intro/message.cs)]

Now, your first bot is complete. You may continue to add on to this
if you desire, but for any bot that will be carrying out multiple
commands, it is strongly encouraged to use the command framework, as
shown below.

For your reference, you may view the [completed program].

[MessageReceived]: xref:Discord.WebSocket.DiscordSocketClient#Discord_WebSocket_DiscordSocketClient_MessageReceived
[SocketMessage]: xref:Discord.WebSocket.SocketMessage
[SocketMessageChannel]: xref:Discord.WebSocket.SocketMessageChannel
[completed program]: samples/intro/complete.cs

# Building a bot with commands

This section will show you how to write a program that is ready for
[commands](commands.md). Note that this will not be explaining _how_
to write commands or services, it will only be covering the general
structure.

For reference, view an [annotated example] of this structure.

[annotated example]: samples/intro/structure.cs

It is important to know that the recommended design pattern of bots
should be to separate the program (initialization and command handler),
the modules (handle commands), and the services (persistent storage,
pure functions, data manipulation).

[ConnectAsync]: xref:Discord.WebSocket.DiscordSocketClient#Discord_WebSocket_DiscordSocketClient_ConnectAsync_System_Boolean_
**todo:** diagram of bot structure

+ 15
- 0
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@@ -0,0 +1,15 @@
using System;
using System.Threading.Tasks;

namespace MyBot
{
public class Program
{
public static void Main(string[] args)
=> new Program().MainAsync().GetAwaiter().GetResult();

public async Task MainAsync()
{
}
}
}

+ 16
- 0
docs/guides/samples/intro/client.cs View File

@@ -0,0 +1,16 @@
// Program.cs
using Discord.WebSocket;
// ...
public async Task MainAsync()
{
var client = new DiscordSocketClient();

client.Log += Log;

string token = "abcdefg..."; // Remember to keep this private!
await client.LoginAsync(TokenType.Bot, token);
await client.StartAsync();

// Block this task until the program is closed.
await Task.Delay(-1);
}

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- 0
docs/guides/samples/intro/complete.cs View File

@@ -0,0 +1,42 @@
using Discord;
using Discord.WebSocket;
using System;
using System.Threading.Tasks;

namespace MyBot
{
public class Program
{
public static void Main(string[] args)
=> new Program().MainAsync().GetAwaiter().GetResult();

public async Task MainAsync()
{
var client = new DiscordSocketClient();

client.Log += Log;
client.MessageReceived += MessageReceived;

string token = "abcdefg..."; // Remember to keep this private!
await client.LoginAsync(TokenType.Bot, token);
await client.StartAsync();

// Block this task until the program is closed.
await Task.Delay(-1);
}

private async Task MessageReceived(SocketMessage message)
{
if (message.Content == "!ping")
{
await message.Channel.SendMessageAsync("Pong!");
}
}

private Task Log(LogMessage msg)
{
Console.WriteLine(msg.ToString());
return Task.CompletedTask;
}
}
}

+ 22
- 0
docs/guides/samples/intro/logging.cs View File

@@ -0,0 +1,22 @@
using Discord;
using System;
using System.Threading.Tasks;

namespace MyBot
{
public class Program
{
public static void Main(string[] args)
=> new Program().MainAsync().GetAwaiter().GetResult();

public async Task MainAsync()
{
}

private Task Log(LogMessage msg)
{
Console.WriteLine(msg.ToString());
return Task.CompletedTask;
}
}
}

+ 14
- 0
docs/guides/samples/intro/message.cs View File

@@ -0,0 +1,14 @@
public async Task MainAsync()
{
// client.Log ...
client.MessageReceived += MessageReceived;
// ...
}

private async Task MessageReceived(SocketMessage message)
{
if (message.Content == "!ping")
{
await message.Channel.SendMessageAsync("Pong!");
}
}

docs/guides/samples/first-steps.cs → docs/guides/samples/intro/structure.cs View File

@@ -77,7 +77,6 @@ class Program

// Login and connect.
await _client.LoginAsync(TokenType.Bot, /* <DON'T HARDCODE YOUR TOKEN> */);
// Prior to rc-00608 this was ConnectAsync();
await _client.StartAsync();
// Wait infinitely so your bot actually stays connected.
@@ -96,10 +95,10 @@ class Program
await _commands.AddModuleAsync<SomeModule>();

// Subscribe a handler to see if a message invokes a command.
_client.MessageReceived += CmdHandler;
_client.MessageReceived += HandleCommandAsync;
}

private async Task CmdHandler(SocketMessage arg)
private async Task HandleCommandAsync(SocketMessage arg)
{
// Bail out if it's a System Message.
var msg = arg as SocketUserMessage;

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