rust打开图片crop裁剪后保存后再打开再获取小图的base64

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　　如题所示，功能代码如下：

extern crate image;

use std::fs::File;
use std::io::{BufWriter, Write};
use image::load_from_memory_with_format;
use image::ImageFormat;
use image_base64;
use image::{GenericImageView, ImageBuffer, RgbImage, imageops};
fn main() {
openpic_crop_getbase64();
}
fn openpic_crop_getbase64(){
let pic_path = "src/output.png";
let img: image::DynamicImage = image::open(pic_path).unwrap();
let mut img = img.to_rgb8();
//let mut img: RgbImage = ImageBuffer::new(512, 512);
let cropimg = imageops::crop(&mut img, 0, 0, 17, 20);
//assert!(cropimg.dimensions() == (30, 10));
let mycutmemorypic = cropimg.to_image();
ImageBuffer::save(&mycutmemorypic, "fk.png").unwrap();
let base64_string= image_base64::to_base64("fk.png");
let mygetbase64str=base64_string.split(",").nth(1).unwrap();//获取base64编码逗号右边的有效串
println!("截图保存后获得的base64str编码：{}",mygetbase64str);
}
/*
[dependencies]
image="*"
base64="*"
image-base64="*"
*/

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