Javascript 将Windows XP转换为原始数据以在html前端中显示

以下是如何将HICON转换为PNG图标的base64表示形式:

use base64::{engine::general_purpose, Engine as _};
use image::RgbaImage;
use std::{mem::{self, MaybeUninit},ptr::addr_of_mut};
use windows::Win32::{Foundation::HWND, Graphics::Gdi::{DeleteObject, GetDC, GetDIBits, GetObjectW, ReleaseDC, BITMAP, BITMAPINFOHEADER, BI_RGB,DIB_RGB_COLORS, HDC}, UI::WindowsAndMessaging::{GetIconInfo, HICON}};

unsafe fn icon_to_rgba_image(icon: HICON) -> String {
    let bitmap_size = i32::try_from(mem::size_of::<BITMAP>()).unwrap();
    let biheader_size = u32::try_from(mem::size_of::<BITMAPINFOHEADER>()).unwrap();

    let mut info = MaybeUninit::uninit();
    GetIconInfo(icon, info.as_mut_ptr()).unwrap();
    let info = info.assume_init_ref();
    DeleteObject(info.hbmMask).unwrap();

    let mut bitmap: MaybeUninit<BITMAP> = MaybeUninit::uninit();
    let result = GetObjectW(
        info.hbmColor,
        bitmap_size,
        Some(bitmap.as_mut_ptr().cast()),
    );
    assert!(result == bitmap_size);
    let bitmap = bitmap.assume_init_ref();

    let width = u32::try_from(bitmap.bmWidth).unwrap();
    let height = u32::try_from(bitmap.bmHeight).unwrap();
    let w = usize::try_from(bitmap.bmWidth).unwrap();
    let h = usize::try_from(bitmap.bmHeight).unwrap();

    let buf_size = w
        .checked_mul(h)
        .and_then(|size| size.checked_mul(4))
        .unwrap();
    let mut buf: Vec<u8> = Vec::with_capacity(buf_size);

    let dc = GetDC(HWND(0));
    assert!(dc != HDC(0));

    let mut bitmap_info = BITMAPINFOHEADER {
        biSize: biheader_size,
        biWidth: bitmap.bmWidth,
        biHeight: -bitmap.bmHeight,
        biPlanes: 1,
        biBitCount: 32,
        biCompression: BI_RGB,
        biSizeImage: 0,
        biXPelsPerMeter: 0,
        biYPelsPerMeter: 0,
        biClrUsed: 0,
        biClrImportant: 0,
    };
    let result = GetDIBits(
        dc,
        info.hbmColor,
        0,
        height,
        Some(buf.as_mut_ptr().cast()),
        addr_of_mut!(bitmap_info).cast(),
        DIB_RGB_COLORS,
    );
    buf.set_len(buf.capacity());

    let result = ReleaseDC(HWND(0), dc);
    assert!(result == 1);
    DeleteObject(info.hbmColor).unwrap();

    for chunk in buf.chunks_exact_mut(4) {
        let [b, _, r, _] = chunk else { unreachable!() };
        mem::swap(b, r);
    }

    let img = RgbaImage::from_vec(width, height, buf).unwrap();

    let mut data: Vec<u8> = Vec::new();
    img.write_to(&mut Cursor::new(&mut data), image::ImageOutputFormat::Png)?;

    general_purpose::STANDARD.encode(&data);
}

=

所以Tauri是建立在TAO的基础上的，这是winit的Forking ，他们为那里的每个平台实现窗口管理.

具体来说是windows/window.rs个，所以在您的情况下，我会克隆TAO存储库并在其中添加所需的更改，然后克隆patch个依赖项以使其指向您的TAO版本.

现在，以下是与TAO implements hicon相关的类:

let class = WNDCLASSEXW {
    cbSize: mem::size_of::<WNDCLASSEXW>() as u32,
    style: CS_HREDRAW | CS_VREDRAW | CS_OWNDC,
    lpfnWndProc: Some(window_proc),
    cbClsExtra: 0,
    cbWndExtra: 0,
    hInstance: HINSTANCE(GetModuleHandleW(PCWSTR::null()).unwrap_or_default().0),
    hIcon: HICON::default(),
    hCursor: HCURSOR::default(), // must be null in order for cursor state to work properly
    hbrBackground: HBRUSH::default(),
    lpszMenuName: PCWSTR::null(),
    lpszClassName: PCWSTR::from_raw(class_name.as_ptr()),
    hIconSm: HICON::default(),
  };

哦，值得一提的是，Tauri使用的是windows箱，而不是winapi箱.它的下载量较少，但我认为微软的支持更好.从本质上讲，这与apple-sys为Mac所做的非常相似.

正如乔纳森·波特所指出的，你需要用GetIconInfo来获取他的信息:

pub struct ICONINFO {
    pub fIcon: BOOL,
    pub xHotspot: u32,
    pub yHotspot: u32,
    pub hbmMask: HBITMAP,
    pub hbmColor: HBITMAP,
}

所以回答你最初的问题，不，你不能打印hicon，因为它只是a handle:

pub type HICON = isize;

附注:这是如何在Windows上TAO check visibility的一个窗口.

附注:Same Place有~7 ways个选项来获取HWND和其他格式的Windows硬件ID.