Client Basics Questions
My client keeps returning 401 upon logging in!
There are few possible reasons why this may occur.
- You are not using the appropriate
TokenType. If you are using a bot account created from the Discord Developer portal, you should be using TokenType.Bot.
- You are not using the correct login credentials. Please keep in mind that tokens start with
Mj*. If it starts with any other characters, chances are, you are using the client secret, which has nothing to do with the login token.
How do I do X, Y, Z when my bot connects/logs on? Why do I get a NullReferenceException upon calling any client methods after connect?
Your bot should not attempt to interact in any way with guilds/servers until the Ready event fires. When the bot connects, it first has to download guild information from Discord in order for you to get access to any server information; the client is not ready at this point. Technically, the GuildAvailable event fires once the data for a particular guild has downloaded; however, it's best to wait for all guilds to be downloaded. Once all downloads are complete, the Ready event is triggered, then you can proceed to do whatever you like.
How do I get a message's previous content when that message is edited?
If you need to do anything with messages (e.g. checking Reactions, checking the content of edited/deleted messages), you must set the MessageCacheSize in your DiscordSocketConfig settings in order to use the cached message entity. Read more about it here.
- Message Cache must be enabled.
- Hook the
MessageUpdated event. This event provides a before and after object.
- Only messages received AFTER the bot comes online will be available in the cache.
