本文提供了将windows系统的截图另存为png格式图片的方法。

添加依赖

cargo add clipboard-win
cargo add image
cargo add windows

配置修改windows依赖特性

[dependencies]
image = "0.25.0"[target.'cfg(windows)'.dependencies]
windows = "0.51.1"
clipboard-win = "5.3.0"[dependencies.windows]
version = "0.51"
features = ["Win32_Foundation","Win32_System_DataExchange","Win32_Graphics_Gdi","Win32_System_LibraryLoader","Win32_UI_WindowsAndMessaging","Win32_System_DataExchange","Win32_System_Registry",
]

模拟windows截图并另存为png文件

use clipboard_win::formats::Bitmap;
use clipboard_win::{Clipboard, Getter, Setter};
use core::{mem, ptr};
use image::{codecs::png::PngEncoder, GenericImageView, ImageEncoder, ImageFormat,
};
use std::env;
use std::io::Write;
use std::{fs,io::{BufReader, BufWriter, Cursor},
};
use windows::Win32::Graphics::Gdi::{BITMAPFILEHEADER, BITMAPINFOHEADER};const INFO_HEADER_LEN: usize = mem::size_of::<BITMAPINFOHEADER>();
const FILE_HEADER_LEN: usize = mem::size_of::<BITMAPFILEHEADER>();#[test]
fn test_to_png() {// 读取bitmap文件let image_path = env::current_dir().unwrap().join("tests/test-image.bmp");let test_image_bytes = std::fs::read(image_path).expect("Read test image");// 打开剪贴板let _clip = Clipboard::new_attempts(10).expect("Open clipboard");// 保存到剪贴板模拟截图Bitmap.write_clipboard(&test_image_bytes).expect("To set image");// 从剪贴板读取截图let mut output: Vec<u8> = Vec::new();let _ = Bitmap.read_clipboard(&mut output);// 获得位图的大小（在栈上申请一块未初始化内存）let mut info_header = mem::MaybeUninit::<BITMAPINFOHEADER>::uninit();let info_header = unsafe {ptr::copy_nonoverlapping(output.as_ptr().add(FILE_HEADER_LEN),info_header.as_mut_ptr() as _,INFO_HEADER_LEN,);// 把T的所有权返回，编译器会主动对T调用dropinfo_header.assume_init()};let bitmap_width = info_header.biWidth;let bitmap_height = info_header.biHeight;assert_eq!(bitmap_width, 750);assert_eq!(bitmap_height, 300);// 将数组转换为BufReader对象，并读取位图信息let buf_reader = BufReader::new(Cursor::new(output));let img = image::load(buf_reader, ImageFormat::Bmp).unwrap();// 转换为png格式let mut png_file_content = Vec::new();let buff_writer = BufWriter::new(&mut png_file_content);let encoder = PngEncoder::new(buff_writer);let _ = encoder.write_image(&img.as_bytes().to_vec(),img.dimensions().0,img.dimensions().1,img.color().into(),);// 另存为png文件let png_path = env::current_dir().unwrap().join("tests/test-image.png");let mut file = fs::File::create(png_path).unwrap();file.write_all(png_file_content.as_slice()).unwrap();
}