Take a screenshot of a specific window or entire screen on Windows platform
capture_window() draws black border for some windows
If you call capture_window() and got 0x80070578 "invalid window handle" make sure captured window is not minimized
capture_window() uses undocumented PW_RENDERFULLCONTENT which first appeared in Windows 8.1
use image::{DynamicImage, RgbaImage};
use regex::Regex;
use win_screenshot::prelude::*;
fn main() {
// Capture entire screen
let buf = capture_display().unwrap();
// Capture window by known id
let buf = capture_window(11996706).unwrap();
// Capture window if you know the exact name
let hwnd = find_window("Notepad").unwrap();
let buf = capture_window(hwnd).unwrap();
// If you don't know the exact name, try to find it
let re = Regex::new(r"Steam").unwrap();
let hwnd = window_list()
.unwrap()
.iter()
.find(|i| re.is_match(&i.window_name))
.unwrap()
.hwnd;
let buf = capture_window(hwnd).unwrap();
// convert to image and save
let img = DynamicImage::ImageRgba8(
RgbaImage::from_raw(buf.width, buf.height, buf.pixels).unwrap());
img.to_rgb8().save("screenshot.jpg").unwrap();
// Fine tuning
// BitBlt dramatically faster, often fails
// (e.g. firefox, steam, 3d accelerated windows)
let using = Using::BitBlt;
// PrintWindow much slower, much more reliable
let using = Using::PrintWindow;
// Capture client area of window
let area = Area::ClientOnly;
// Capture whole window (not supported with BitBlt)
let area = Area::Full;
// Build-in crop, faster on large windows
let crop_xy = None; //Some([100, 100]);
let crop_wh = None; //Some([300, 300]);
let buf = capture_window_ex(hwnd, using, area, crop_xy, crop_wh).unwrap();
}