D++ (DPP)
C++ Discord API Bot Library
Creating a Sound Board

This example script shows how to send a sound file to a voice channel. A few shortcuts are taken here, for more advanced techniques for connecting to a voice channel see the tutorial Join or Switch to the Voice Channel of the User Issuing a Command .

#include <dpp/dpp.h>
#include <iomanip>
#include <sstream>
int main() {
/* Load a sound file called Robot.pcm into memory.
* The bot expects PCM format, which are raw sound data,
* 2 channel stereo, 16 bit signed 48000Hz.
* You can use audacity to export these from WAV or MP3 etc.
* If you wanted to send a more complicated format, you could
* use a separate library to decode that audio to PCM. For
* example purposes, a raw PCM will suffice. This PCM file can
* be found within the bot's github repo.
uint8_t* robot = nullptr;
size_t robot_size = 0;
std::ifstream input ("../testdata/Robot.pcm", std::ios::in|std::ios::binary|std::ios::ate);
if (input.is_open()) {
robot_size = input.tellg();
robot = new uint8_t[robot_size];
input.seekg (0, std::ios::beg);
input.read ((char*)robot, robot_size);
/* Setup the bot */
dpp::cluster bot("token");
/* The event is fired when someone issues your commands */
bot.on_slashcommand([&bot, robot, robot_size](const dpp::slashcommand_t& event) {
/* Check which command they ran */
if (event.command.get_command_name() == "join") {
/* Get the guild */
dpp::guild* g = dpp::find_guild(event.command.guild_id);
/* Attempt to connect to a voice channel, returns false if we fail to connect. */
if (!g->connect_member_voice(event.command.get_issuing_user().id)) {
event.reply("You don't seem to be in a voice channel!");
/* Tell the user we joined their channel. */
event.reply("Joined your channel!");
} else if (event.command.get_command_name() == "robot") {
/* Get the voice channel the bot is in, in this current guild. */
dpp::voiceconn* v = event.from->get_voice(event.command.guild_id);
/* If the voice channel was invalid, or there is an issue with it, then tell the user. */
if (!v || !v->voiceclient || !v->voiceclient->is_ready()) {
event.reply("There was an issue with getting the voice channel. Make sure I'm in a voice channel!");
/* Tell the bot to play the sound file 'Robot.pcm' in the current voice channel. */
v->voiceclient->send_audio_raw((uint16_t*)robot, robot_size);
event.reply("Played robot.");
bot.on_ready([&bot](const dpp::ready_t & event) {
if (dpp::run_once<struct register_bot_commands>()) {
/* Create a new command. */
dpp::slashcommand joincommand("join", "Joins your voice channel.", bot.me.id);
dpp::slashcommand robotcommand("robot", "Plays a robot noise in your voice channel.", bot.me.id);
bot.global_bulk_command_create({ joincommand, robotcommand });
/* Start bot */
return 0;
The cluster class represents a group of shards and a command queue for sending and receiving commands...
Definition: cluster.h:80
std::string get_command_name() const
Get the command name for a command interaction.
Represents an application command, created by your bot either globally, or on a guild.
Definition: appcommand.h:1339
constexpr const char robot[]
Definition: unicode_emoji.h:1654
constexpr const char v[]
Definition: unicode_emoji.h:1837
std::function< void(const dpp::log_t &)> DPP_EXPORT cout_logger()
Get a default logger that outputs to std::cout. e.g.
@ st_wait
Wait forever on a condition variable. The cluster will spawn threads for each shard and start() will ...
Definition: cluster.h:63
void reply(command_completion_event_t callback=utility::log_error()) const
Acknowledge interaction without displaying a message to the user, for use with button and select menu...
interaction command
command interaction
Definition: dispatcher.h:678
Session ready.
Definition: dispatcher.h:961
User has issued a slash command.
Definition: dispatcher.h:695
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