在Rust中使用winapi从窗口获取位图

use winapi::um::winuser::{GetDC, ReleaseDC};
use winapi::shared::windef::{HDC, HWND, RECT};
use winapi::um::wingdi::{CreateCompatibleDC, CreateCompatibleBitmap, GetClientRect, BitBlt, DeleteDC, DeleteObject, SelectObject};
use winapi::ctypes::c_int;
use std::ptr;

fn get_window_bitmap(hwnd: HWND) {
    unsafe {
        let mut rect: RECT = std::mem::zeroed();
        let hdc_screen: HDC = GetDC(ptr::null_mut());
        let hdc_window: HDC = GetDC(hwnd);

        GetClientRect(hwnd, &mut rect);

        let width: c_int = rect.right - rect.left;
        let height: c_int = rect.bottom - rect.top;

        let hdc_mem: HDC = CreateCompatibleDC(hdc_screen);
        let hbitmap: HBITMAP = CreateCompatibleBitmap(hdc_screen, width, height);
        let hbitmap_old: HBITMAP = SelectObject(hdc_mem, hbitmap);

        BitBlt(hdc_mem, 0, 0, width, height, hdc_window, 0, 0, winapi::um::wingdi::SRCCOPY);

        // 在此处进行位图操作，如保存到文件或显示在窗口上

        SelectObject(hdc_mem, hbitmap_old);
        DeleteObject(hbitmap);
        DeleteDC(hdc_mem);
        ReleaseDC(hwnd, hdc_window);
        ReleaseDC(ptr::null_mut(), hdc_screen);
    }
}

use winapi::um::winuser::{GetForegroundWindow, GetWindowTextW};

fn main() {
    unsafe {
        let mut buffer: [u16; 512] = [0; 512];
        let hwnd: HWND = GetForegroundWindow();
        GetWindowTextW(hwnd, buffer.as_mut_ptr(), 512);
        let title = String::from_utf16_lossy(&buffer);
        println!("当前窗口标题：{}", title);
        get_window_bitmap(hwnd);
    }
}