How to get the channel Id and Access hash

[jiyamathias]

I want to use the method api.ChannelsUpdateUsername() but it requests payload is

type ChannelsUpdateUsernameRequest struct {
	// Channel
	Channel InputChannelClass
	// New username
	Username string
}

and this is the InputChannelClass object below

type InputChannel struct {
	// Channel ID
	ChannelID int64
	// Access hash taken from the channel¹ constructor
	//
	// Links:
	//  1) https://core.telegram.org/constructor/channel
	AccessHash int64
}

I don't know how to get the ChannelID and AccessHash for the InputChannel object.
I have been stuck here for days now and don't know how to move forward.

[zthreee]

This is how I hanlded it - not sure if there is a better way, but works for now:

func getChannelName(ctx context.Context, client *tg.Client, channelID int64) (string, int64, error) {
	inputChannel := &tg.InputChannel{
		ChannelID:  channelID,
		AccessHash: 0,
	}
	channels, err := client.ChannelsGetChannels(ctx, []tg.InputChannelClass{inputChannel})

	if err != nil {
		return "", 0, fmt.Errorf("failed to fetch channel: %w", err)
	}

	if len(channels.GetChats()) == 0 {
		return "", 0, fmt.Errorf("no channels found")
	}

	channel := channels.GetChats()[0].(*tg.Channel)
	return channel.Username, channel.AccessHash, nil
}

[idkroff]

You're genius.

[RoninInPC]

This don't working. A HASH OF ZERO IS RETURNED. Most likely, something else needs to be done.

[RoninInPC]

Problem find, delete -100 in prefix channel

[jiyamathias]

Thanks for taking your time to respond to me.
Much appreciation 🙏

Although I have a question, how do I get the channel ID?

[RoninInPC]

One of the ways to open telegram web and see the url of the channel, there will be a number.