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\page caching-messages Caching Messages
By default D++ does not cache messages. The example program below demonstrates how to instantiate a custom cache using dpp::cache which will allow you to cache messages and query the cache for messages by ID.
This can be adjusted to cache any type derived from dpp::managed including types you define yourself.
@note This example will cache and hold onto messages forever! In a real world situation this would be bad. If you do use this, you should use the dpp::cache::remove() method periodically to remove stale items. This is left out of this example as a learning exercise to the reader. For further reading please see the documentation of dpp::cache
#include <dpp/dpp.h>
#include <sstream>
int main() {
/* Create bot */
dpp::cluster bot("token", dpp::i_default_intents | dpp::i_message_content);
/* Create a cache to contain types of dpp::message */
dpp::cache<dpp::message> message_cache;
bot.on_log(dpp::utility::cout_logger());
/* Message handler */
bot.on_message_create([&](const dpp::message_create_t &event) {
/* Make a permanent pointer using new, for each message to be cached */
dpp::message* m = new dpp::message();
/* Store the message into the pointer by copying it */
*m = event.msg;
/* Store the new pointer to the cache using the store() method */
message_cache.store(m);
/* Simple ghetto command handler. In the real world, use slashcommand or commandhandler here. */
std::stringstream ss(event.msg.content);
std::string cmd;
dpp::snowflake msg_id;
ss >> cmd;
/* Look for our command */
if (cmd == "!get") {
ss >> msg_id;
/* Search our cache for a cached message */
dpp::message* find_msg = message_cache.find(msg_id);
if (find_msg != nullptr) {
/* Found a cached message, echo it out */
bot.message_create(dpp::message(event.msg.channel_id, "This message had the following content: " + find_msg->content));
} else {
/* Nothing like that here. Have you checked under the carpet? */
bot.message_create(dpp::message(event.msg.channel_id, "There is no message cached with this ID"));
}
}
});
/* Start bot */
bot.start(dpp::st_wait);
return 0;
}