tray-icon 0.22.1

Create tray icons for desktop applications
Documentation 
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// Copyright 2022-2022 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

use windows_sys::Win32::{Foundation::HWND, UI::WindowsAndMessaging::WINDOW_LONG_PTR_INDEX};

pub fn encode_wide<S: AsRef<std::ffi::OsStr>>(string: S) -> Vec<u16> {
    std::os::windows::prelude::OsStrExt::encode_wide(string.as_ref())
        .chain(std::iter::once(0))
        .collect()
}

// taken from winit's code base
// https://github.com/rust-windowing/winit/blob/ee88e38f13fbc86a7aafae1d17ad3cd4a1e761df/src/platform_impl/windows/util.rs#L138
pub fn get_instance_handle() -> windows_sys::Win32::Foundation::HMODULE {
    // Gets the instance handle by taking the address of the
    // pseudo-variable created by the microsoft linker:
    // https://devblogs.microsoft.com/oldnewthing/20041025-00/?p=37483

    // This is preferred over GetModuleHandle(NULL) because it also works in DLLs:
    // https://stackoverflow.com/questions/21718027/getmodulehandlenull-vs-hinstance

    extern "C" {
        static __ImageBase: windows_sys::Win32::System::SystemServices::IMAGE_DOS_HEADER;
    }

    unsafe { &__ImageBase as *const _ as _ }
}

#[inline(always)]
pub unsafe fn get_window_long(hwnd: HWND, nindex: WINDOW_LONG_PTR_INDEX) -> isize {
    #[cfg(target_pointer_width = "64")]
    return unsafe { windows_sys::Win32::UI::WindowsAndMessaging::GetWindowLongPtrW(hwnd, nindex) };
    #[cfg(target_pointer_width = "32")]
    return unsafe {
        windows_sys::Win32::UI::WindowsAndMessaging::GetWindowLongW(hwnd, nindex) as isize
    };
}

#[inline(always)]
pub unsafe fn set_window_long(
    hwnd: HWND,
    nindex: WINDOW_LONG_PTR_INDEX,
    dwnewlong: isize,
) -> isize {
    #[cfg(target_pointer_width = "64")]
    return unsafe {
        windows_sys::Win32::UI::WindowsAndMessaging::SetWindowLongPtrW(hwnd, nindex, dwnewlong)
    };
    #[cfg(target_pointer_width = "32")]
    return unsafe {
        windows_sys::Win32::UI::WindowsAndMessaging::SetWindowLongW(hwnd, nindex, dwnewlong as i32)
            as isize
    };
}