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Overview

This example demonstrates how to fetch members from a chat (group or channel) with filtering options like admins, bots, or recent members.

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Code

package main

import (
	"fmt"

	"github.com/amarnathcjd/gogram/telegram"
)

func main() {
	// Create a new Telegram client
	client, _ := telegram.NewClient(telegram.ClientConfig{
		AppID:   6,
		AppHash: "YOUR_APP_HASH",
	})
	
	// Login with your phone number (user account)
	client.Login("+1234567890")
	
	// Get all admin members from a chat
	// Use negative chat ID for groups/channels (e.g., -100123456789)
	members, count, _ := client.GetChatMembers(-100123456789, &telegram.ParticipantOptions{
		Filter: &telegram.ChannelParticipantsAdmins{}, // Filter for admins only
	})
	
	// Alternative: Use IterChatMembers() for yielding members one by one
	// Useful for large groups to avoid loading all members into memory
	
	// Print total admin count
	fmt.Printf("Total Admins: %d\n", count)
	
	// Iterate through each admin member
	for _, m := range members {
		fmt.Printf("Admin: %s (ID: %d)\n", m.User.FirstName, m.User.ID)
	}

	// Keep the client running
	client.Idle()
}

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How It Works

  1. Authentication: Connects using user account (required for accessing chat members)
  2. Fetch Members: Calls GetChatMembers() with chat ID and filter options
  3. Filter Results: Uses ChannelParticipantsAdmins to get only admin members
  4. Display Information: Prints each admin’s name and user ID

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Participant Filters

Use different filters to get specific member types: 
members, count, _ := client.GetChatMembers(chatID, &telegram.ParticipantOptions{
	Filter: &telegram.ChannelParticipantsRecent{}, // Recent members
	Limit:  100, // Maximum members to fetch (default: 200)
})

fmt.Printf("Total Members: %d\n", count)
for _, m := range members {
	fmt.Printf("%s (@%s)\n", m.User.FirstName, m.User.Username)
}

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Using IterChatMembers

For large groups, use IterChatMembers() to avoid memory issues: 
// Iterate through members one by one
partsChan, errChan := client.IterChatMembers(chatID, &telegram.ParticipantOptions{
	Filter: &telegram.ChannelParticipantsRecent{},
})

for {
    select {
    case member, ok := <-partsChan:
        if !ok {
            partsChan = nil
        } else {
            fmt.Printf("%s (ID: %d)\n", member.User.FirstName, member.User.ID)
        }
    case err, ok := <-errChan:
        if !ok {
            errChan = nil
        } else {
            fmt.Println("Error:", err)
        }
    }
    if partsChan == nil && errChan == nil {
        break
    }
}

if err != nil {
	fmt.Println("Error:", err)
}

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ParticipantOptions Parameters

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Filter
ChannelParticipantsFilter
Filter type: Recent, Admins, Bots, Kicked, Banned, Search, Contacts
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Query
string
Search query to filter members by name or username
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Limit
int
Maximum number of members to fetch (default: 200, max: 200 per request)
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Offset
int
Offset for pagination (use with multiple requests to fetch all members)

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Running the Example

  1. Replace YOUR_APP_HASH with your actual app hash from my.telegram.org
  2. Replace +1234567890 with your phone number
  3. Replace -100123456789 with your target chat ID (use negative IDs for groups/channels)
  4. Run the program
Important: This requires a user account, not a bot. Bots have limited access to chat members and can only see:
  • Members who have interacted with the bot
  • Admins in groups where the bot is an admin
To get a chat’s ID, you can:
  • Forward a message from the chat to @userinfobot
  • Use client.GetDialogs() to list all your chats with their IDs
  • Use client.GetPeerID("@username") for public groups/channels

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Next Steps

Get Dialogs

Fetch all your chats and conversations

Welcome Bot

Handle new member joins in groups