D++ (DPP)  10.0.30
C++ Discord API Bot Library
Using File Parameters for Application Commands (Slash Commands)

The program below demonstrates how to use the 'file' type parameter to an application command (slash command). You must first get the file_id via std::get, and then you can find the attachment details in the 'resolved' section, event.command.resolved.

The file is uploaded to Discord's CDN so if you need it locally you should fetch the .url value, e.g. by using something like dpp::cluster::request().

#include <dpp/dpp.h>
int main() {
dpp::cluster bot("token");
/* The event is fired when someone issues your commands */
bot.on_slashcommand([&bot](const dpp::slashcommand_t& event) {
/* Check which command they ran */
if (event.command.get_command_name() == "show") {
/* Get the file id from the parameter attachment. */
dpp::snowflake file_id = std::get<dpp::snowflake>(event.get_parameter("file"));
/* Get the attachment that the user inputted from the file id. */
dpp::attachment att = event.command.get_resolved_attachment(file_id);
/* Reply with the file as a URL. */
event.reply(att.url);
}
});
bot.on_ready([&bot](const dpp::ready_t & event) {
if (dpp::run_once<struct register_bot_commands>()) {
/* Create a new command. */
dpp::slashcommand newcommand("show", "Show an uploaded file", bot.me.id);
/* Add a parameter option. */
newcommand.add_option(dpp::command_option(dpp::co_attachment, "file", "Select an image"));
/* Register the command */
bot.global_command_create(newcommand);
}
});
bot.start(dpp::st_wait);
return 0;
}
dpp::co_attachment
@ co_attachment
File attachment type.
Definition: appcommand.h:123
dpp::slashcommand_t
User has issued a slash command.
Definition: dispatcher.h:715
dpp.h
dpp::st_wait
@ st_wait
Wait forever on a condition variable.
Definition: cluster.h:101
main
int main()
Definition: soak.cpp:28
dpp::interaction_create_t::command
interaction command
command interaction
Definition: dispatcher.h:698
dpp::utility::cout_logger
std::function< void(const dpp::log_t &)> DPP_EXPORT cout_logger()
Get a default logger that outputs to std::cout.
Definition: dispatcher.h:228
dpp::slashcommand
Represents an application command, created by your bot either globally, or on a guild.
Definition: appcommand.h:1358
dpp::interaction::get_command_name
std::string get_command_name() const
Get the command name for a command interaction.
Definition: slashcommand.cpp:487
dpp::command_option
Each command option is a command line parameter.
Definition: appcommand.h:222
dpp::cluster
The cluster class represents a group of shards and a command queue for sending and receiving commands...
Definition: cluster.h:99
dpp::ready_t
Session ready.
Definition: dispatcher.h:981