Afficher une fenêtre simple en Rust

Sat, 01 Oct 2022 19:08:58 +0900

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[package]
name = "win"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies.winapi]
version = "0.3"
features = ["winuser"]

Le code source est ci-dessous

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#![windows_subsystem = "windows"]
use winapi::{
 um::{
 winuser::{RegisterClassW, WNDCLASSW, CS_HREDRAW, CS_VREDRAW,
 LoadIconW, IDI_APPLICATION, LoadCursorW, IDC_ARROW,
 CreateWindowExW, ShowWindow, SW_NORMAL, UpdateWindow,
 GetMessageW, TranslateMessage, DispatchMessageW, MSG,
 WM_DESTROY, PostQuitMessage, DefWindowProcW, WS_OVERLAPPEDWINDOW,
 CW_USEDEFAULT},
 wingdi::{GetStockObject, WHITE_BRUSH},
 },
 shared::{
 windef::{HWND, HBRUSH},
 minwindef::{UINT, WPARAM, LPARAM, LRESULT},
 },
};
use std::ptr;
use std::mem;

fn main() {
 unsafe {
 let class_name = encode("my_window_class_name");
 if !register_wndclass(&class_name) {
 return;
 }
 let hwnd = create_window(&class_name);
 if hwnd.is_null() {
 return;
 }
 ShowWindow(hwnd, SW_NORMAL);
 UpdateWindow(hwnd);
 let mut msg = mem::uninitialized::<MSG>();
 loop {
 if GetMessageW(&mut msg, ptr::null_mut(), 0, 0) == 0 {
 return;
 }
 TranslateMessage(&mut msg);
 DispatchMessageW(&mut msg);
 }
 }
}

fn encode(source: &str) -> Vec<u16> {
 source.encode_utf16().chain(Some(0)).collect()
}

unsafe fn register_wndclass(class_name: &[u16]) -> bool {
 let mut winc = mem::zeroed::<WNDCLASSW>();
 winc.style = CS_HREDRAW | CS_VREDRAW;
 winc.lpfnWndProc = Some(win_proc);
 winc.hIcon = LoadIconW(ptr::null_mut(), IDI_APPLICATION);
 winc.hCursor = LoadCursorW(ptr::null_mut(), IDC_ARROW);
 winc.hbrBackground = GetStockObject(WHITE_BRUSH as i32) as HBRUSH;
 winc.lpszClassName = class_name.as_ptr();
 RegisterClassW(&winc) > 0
}

unsafe fn create_window(class_name: &[u16]) -> HWND {
 CreateWindowExW(
 0,
 class_name.as_ptr(),
 encode("Hello, World!").as_ptr(),
 WS_OVERLAPPEDWINDOW,
 CW_USEDEFAULT, 0, CW_USEDEFAULT, 0,
 ptr::null_mut(),
 ptr::null_mut(),
 ptr::null_mut(),
 ptr::null_mut(),
 )
}

unsafe extern "system" fn win_proc(hwnd: HWND, msg: UINT, w_param: WPARAM, l_param: LPARAM) -> LRESULT {
 match msg {
 WM_DESTROY => PostQuitMessage(0),
 _ => return DefWindowProcW(hwnd, msg, w_param, l_param),
 };
 0
}

Références

Programmation Windows en Rust - CreateWindow

Fenêtre on kenji.blog

Afficher une fenêtre simple en Rust

Références