Using component interactions (buttons)

Discord's newest features support sending buttons alongside messages, which when clicked by the user trigger an interaction which is routed by D++ as an on_button_click event. To make use of this, use code as in this example.

#include <dpp/dpp.h>
#include <iostream>
#include <dpp/message.h>
 
int main()
{
    dpp::cluster bot("token");
 
    /* Message handler to look for a command called !button */
    bot.on_message_create([&bot](const dpp::message_create_t & event) {
        if (event.msg->content == "!button") {
            /* Create a message containing an action row, and a button within the action row. */
            bot.message_create(
                dpp::message(event.msg->channel_id, "this text has buttons").add_component(
                    dpp::component().add_component(
                        dpp::component().set_label("Click me!").
                        set_emoji("😄").
                        set_style(dpp::cos_danger).
                        set_id("myid")
                    )
                )
            );
        }
    });
 
    /* When a user clicks your button, the on_button_click event will fire,
     * containing the custom_id you defined in your button.
     */
    bot.on_button_click([&bot](const dpp::button_click_t & event) {
        /* Button clicks are still interactions, and must be replied to in some form to
         * prevent the "this interaction has failed" message from Discord to the user.
         */
        event.reply(dpp::ir_channel_message_with_source, "You clicked: " + event.custom_id);
    });
 
    bot.start(false);
 
    return 0;
}

When the feature is functioning, the code below will produce buttons on the reply message like in the image below: