To attach a local file to an message, you can use dpp::utility::read_file. It's a helper function from D++ that allows you to read the file's content and sent it to discord.
An example of this:
#include <dpp/dpp.h>
int main() {
dpp::message msg(event.command.channel_id, "Hey there, I've got a new file!");
msg.add_file("foobar.txt", dpp::utility::read_file("path_to_your_file.txt"));
event.reply(msg);
}
});
if (dpp::run_once<struct register_bot_commands>()) {
bot.global_command_create(
dpp::slashcommand(
"file",
"Send a message with a file attached!", bot.me.id));
}
});
return 0;
}
Attachments via URL aren't possible. But there's a workaround for this! You can download the file and then attach it to the message.
Amazingly, D++ also has a function for this! You can use dpp::cluster::request to make HTTP requests, allowing you to go ahead and pull the content from a URL.
The following example program shows how to request a file and attach it to a message:
#include <dpp/dpp.h>
int main() {
bot.request("https://dpp.dev/DPP-Logo.png", dpp::m_get, [event](const dpp::http_request_completion_t & httpRequestCompletion) {
dpp::message msg(event.command.channel_id, "This is my new attachment:");
if (httpRequestCompletion.status == 200) {
msg.add_file("logo.png", httpRequestCompletion.body);
}
event.reply(msg);
});
}
});
if (dpp::run_once<struct register_bot_commands>()) {
bot.global_command_create(
dpp::slashcommand(
"file",
"Send a message with an image attached from the internet!", bot.me.id));
}
});
return 0;
}
Here's another example of how to add a local image to an embed.
Upload the image in the same message as the embed and then reference it in the embed.
#include <dpp/dpp.h>
int main() {
dpp::message msg(event.command.channel_id, "");
msg.add_file("image.jpg", dpp::utility::read_file("path_to_your_image.jpg"));
dpp::embed embed;
embed.set_image("attachment://image.jpg");
msg.add_embed(embed);
event.reply(msg);
}
});
if (dpp::run_once<struct register_bot_commands>()) {
bot.global_command_create(
dpp::slashcommand(
"file",
"Send a local image along with an embed with the image!", bot.me.id));
}
});
return 0;
}