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windows.rs
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windows.rs
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#![cfg(target_os = "windows")]
use crate::SingleInstanceCallback;
use std::ffi::CStr;
use tauri::{
plugin::{self, TauriPlugin},
AppHandle, Manager, RunEvent, Runtime,
};
use windows_sys::Win32::{
Foundation::{CloseHandle, GetLastError, ERROR_ALREADY_EXISTS, HWND, LPARAM, LRESULT, WPARAM},
System::{
DataExchange::COPYDATASTRUCT,
LibraryLoader::GetModuleHandleW,
Threading::{CreateMutexW, ReleaseMutex},
},
UI::WindowsAndMessaging::{
self as w32wm, CreateWindowExW, DefWindowProcW, DestroyWindow, FindWindowW,
RegisterClassExW, SendMessageW, GWL_STYLE, GWL_USERDATA, WINDOW_LONG_PTR_INDEX,
WM_COPYDATA, WM_DESTROY, WNDCLASSEXW, WS_EX_LAYERED, WS_EX_NOACTIVATE, WS_EX_TOOLWINDOW,
WS_EX_TRANSPARENT, WS_OVERLAPPED, WS_POPUP, WS_VISIBLE,
},
};
struct MutexHandle(isize);
struct TargetWindowHandle(isize);
const WMCOPYDATA_SINGLE_INSTANCE_DATA: usize = 1542;
pub fn init<R: Runtime>(f: Box<SingleInstanceCallback<R>>) -> TauriPlugin<R> {
plugin::Builder::new("single-instance")
.setup(|app| {
let id = &app.config().tauri.bundle.identifier;
let class_name = encode_wide(format!("{}-sic", id));
let window_name = encode_wide(format!("{}-siw", id));
let mutex_name = encode_wide(format!("{}-sim", id));
let hmutex =
unsafe { CreateMutexW(std::ptr::null(), true.into(), mutex_name.as_ptr()) };
if unsafe { GetLastError() } == ERROR_ALREADY_EXISTS {
unsafe {
let hwnd = FindWindowW(class_name.as_ptr(), window_name.as_ptr());
if hwnd != 0 {
let data = format!(
"{}|{}\0",
std::env::current_dir()
.unwrap_or_default()
.to_str()
.unwrap_or_default(),
std::env::args().collect::<Vec<String>>().join("|")
);
let bytes = data.as_bytes();
let cds = COPYDATASTRUCT {
dwData: WMCOPYDATA_SINGLE_INSTANCE_DATA,
cbData: bytes.len() as _,
lpData: bytes.as_ptr() as _,
};
SendMessageW(hwnd, WM_COPYDATA, 0, &cds as *const _ as _);
app.exit(0);
}
}
} else {
app.manage(MutexHandle(hmutex));
let hwnd = create_event_target_window::<R>(&class_name, &window_name);
unsafe {
SetWindowLongPtrW(
hwnd,
GWL_USERDATA,
Box::into_raw(Box::new((app.clone(), f))) as _,
)
};
app.manage(TargetWindowHandle(hwnd));
}
Ok(())
})
.on_event(|app, event| {
if let RunEvent::Exit = event {
destroy(app);
}
})
.build()
}
pub fn destroy<R: Runtime, M: Manager<R>>(manager: &M) {
if let Some(hmutex) = manager.try_state::<MutexHandle>() {
unsafe {
ReleaseMutex(hmutex.0);
CloseHandle(hmutex.0);
}
}
if let Some(hwnd) = manager.try_state::<TargetWindowHandle>() {
unsafe { DestroyWindow(hwnd.0) };
}
}
unsafe extern "system" fn single_instance_window_proc<R: Runtime>(
hwnd: HWND,
msg: u32,
wparam: WPARAM,
lparam: LPARAM,
) -> LRESULT {
let data_ptr = GetWindowLongPtrW(hwnd, GWL_USERDATA)
as *mut (AppHandle<R>, Box<SingleInstanceCallback<R>>);
let (app_handle, callback) = &mut *data_ptr;
match msg {
WM_COPYDATA => {
let cds_ptr = lparam as *const COPYDATASTRUCT;
if (*cds_ptr).dwData == WMCOPYDATA_SINGLE_INSTANCE_DATA {
let data = CStr::from_ptr((*cds_ptr).lpData as _).to_string_lossy();
let mut s = data.split("|");
let cwd = s.next().unwrap();
let args = s.into_iter().map(|s| s.to_string()).collect();
callback(&app_handle, args, cwd.to_string());
}
1
}
WM_DESTROY => {
let _ = Box::from_raw(data_ptr);
0
}
_ => DefWindowProcW(hwnd, msg, wparam, lparam),
}
}
fn create_event_target_window<R: Runtime>(class_name: &[u16], window_name: &[u16]) -> HWND {
unsafe {
let class = WNDCLASSEXW {
cbSize: std::mem::size_of::<WNDCLASSEXW>() as u32,
style: 0,
lpfnWndProc: Some(single_instance_window_proc::<R>),
cbClsExtra: 0,
cbWndExtra: 0,
hInstance: GetModuleHandleW(std::ptr::null()),
hIcon: 0,
hCursor: 0,
hbrBackground: 0,
lpszMenuName: std::ptr::null(),
lpszClassName: class_name.as_ptr(),
hIconSm: 0,
};
RegisterClassExW(&class);
let hwnd = CreateWindowExW(
WS_EX_NOACTIVATE
| WS_EX_TRANSPARENT
| WS_EX_LAYERED
// WS_EX_TOOLWINDOW prevents this window from ever showing up in the taskbar, which
// we want to avoid. If you remove this style, this window won't show up in the
// taskbar *initially*, but it can show up at some later point. This can sometimes
// happen on its own after several hours have passed, although this has proven
// difficult to reproduce. Alternatively, it can be manually triggered by killing
// `explorer.exe` and then starting the process back up.
// It is unclear why the bug is triggered by waiting for several hours.
| WS_EX_TOOLWINDOW,
class_name.as_ptr(),
window_name.as_ptr(),
WS_OVERLAPPED,
0,
0,
0,
0,
0,
0,
GetModuleHandleW(std::ptr::null()),
std::ptr::null(),
);
SetWindowLongPtrW(
hwnd,
GWL_STYLE,
// The window technically has to be visible to receive WM_PAINT messages (which are used
// for delivering events during resizes), but it isn't displayed to the user because of
// the LAYERED style.
(WS_VISIBLE | WS_POPUP) as isize,
);
hwnd
}
}
pub fn encode_wide(string: impl AsRef<std::ffi::OsStr>) -> Vec<u16> {
std::os::windows::prelude::OsStrExt::encode_wide(string.as_ref())
.chain(std::iter::once(0))
.collect()
}
#[cfg(target_pointer_width = "32")]
#[allow(non_snake_case)]
unsafe fn SetWindowLongPtrW(hwnd: HWND, index: WINDOW_LONG_PTR_INDEX, value: isize) -> isize {
w32wm::SetWindowLongW(hwnd, index, value as _) as _
}
#[cfg(target_pointer_width = "64")]
#[allow(non_snake_case)]
unsafe fn SetWindowLongPtrW(hwnd: HWND, index: WINDOW_LONG_PTR_INDEX, value: isize) -> isize {
w32wm::SetWindowLongPtrW(hwnd, index, value)
}
#[cfg(target_pointer_width = "32")]
#[allow(non_snake_case)]
unsafe fn GetWindowLongPtrW(hwnd: HWND, index: WINDOW_LONG_PTR_INDEX) -> isize {
w32wm::GetWindowLongW(hwnd, index) as _
}
#[cfg(target_pointer_width = "64")]
#[allow(non_snake_case)]
unsafe fn GetWindowLongPtrW(hwnd: HWND, index: WINDOW_LONG_PTR_INDEX) -> isize {
w32wm::GetWindowLongPtrW(hwnd, index)
}