Example of sending files for https://github.com/teloxide/teloxide/issues/384 (2)

main.rs

// [dependencies]
// teloxide = "0.4"
// tokio = { version = "1.6", features = ["macros", "rt-multi-thread"] }
// plotters = "0.3"
// image = "0.23"

#[tokio::main]
async fn main() {
    run().await;
}

async fn run() {
    use image::{DynamicImage, ImageBuffer};
    use plotters::prelude::*;
    use teloxide::requests::{Request, Requester};

    let token = "TOKEN";
    let chat = 218485655i64;

    let mut img: Vec<u8> = vec![0; 200 * 200 * 3];
    {
        let mut backend = plotters::prelude::BitMapBackend::with_buffer(&mut img, (200, 200));
        backend
            .draw_rect((50, 50), (150, 150), &RED, true)
            .expect("Failed to draw a rect");
    }

    let img = DynamicImage::ImageRgb8(ImageBuffer::from_raw(200, 200, img).unwrap());

    let mut png: Vec<u8> = Vec::new();
    img.write_to(&mut png, image::ImageOutputFormat::Png)
        .expect("Failed to convert image to png");

    let photo = teloxide::types::InputFile::memory("test.png", png);

    let bot = teloxide::Bot::new(token);

    bot.send_photo(chat, photo)
        .send()
        .await
        .expect("Failed to send request");
}