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rust winapi怎样处理窗口消息

小樊
81
2024-12-03 21:17:36
栏目: 编程语言

在 Rust 中,你可以使用 winapi 库来处理 Windows 窗口消息。winapi 是一个用于访问 Windows API 的库,它提供了大量的函数和数据类型,可以帮助你处理窗口消息。

首先,你需要在 Cargo.toml 文件中添加 winapiwinuser 依赖:

[dependencies]
winapi = "0.3"
winuser = "0.3"

接下来,你可以使用 winapi 库中的函数来处理窗口消息。以下是一个简单的示例,展示了如何使用 winapi 处理窗口消息:

extern crate winapi;
extern crate winuser;

use std::ffi::c_void;
use std::os::raw::c_uint;
use winapi::shared::minwindef::{HWND, UINT, WPARAM, LPARAM};
use winapi::um::winuser::{RegisterWindowMessage, DefWindowProcW, DispatchMessageW, TranslateMessage};

// 自定义窗口类
const CLASS_NAME: &str = "MyWindowClass";

// 窗口过程函数
fn window_proc(hwnd: HWND, msg: UINT, wparam: WPARAM, lparam: LPARAM) -> c_uint {
    match msg {
        winuser::WM_DESTROY => {
            println!("Window received a WM_DESTROY message. Closing...");
            winuser::PostQuitMessage(0);
            0
        },
        _ => DefWindowProcW(hwnd, msg, wparam, lparam),
    }
}

fn main() {
    // 注册窗口类
    unsafe {
        let class_atom = winuser::RegisterClassW(winuser::WNDCLASSEXW {
            cbSize: std::mem::size_of::<winuser::WNDCLASSEXW>() as u32,
            style: 0,
            lpfnWndProc: Some(window_proc as WNDPROC),
            cbClsExtra: 0,
            cbWndExtra: 0,
            hInstance: winapi::GetModuleHandleW(None),
            hIcon: 0,
            hCursor: 0,
            hbrBackground: 0,
            lpszMenuName: None,
            lpszClassName: CLASS_NAME,
            hIconSm: 0,
        });

        if class_atom == 0 {
            panic!("Failed to register window class");
        }
    }

    // 创建窗口
    let hwnd = unsafe {
        winuser::CreateWindowExW(
            0,
            CLASS_NAME,
            "My Window",
            winuser::WS_OVERLAPPEDWINDOW,
            winuser::CW_USEDEFAULT,
            winuser::CW_USEDEFAULT,
            800,
            600,
            None,
            None,
            winapi::GetModuleHandleW(None),
            None,
        )
    };

    if hwnd == 0 {
        panic!("Failed to create window");
    }

    // 消息循环
    unsafe {
        let mut msg = winuser::MSG::default();
        while winuser::GetMessageW(&mut msg, None, 0, 0) != 0 {
            if msg.message == winuser::WM_QUIT {
                break;
            }

            TranslateMessage(&msg);
            DispatchMessageW(&msg);
        }
    }
}

这个示例中,我们首先注册了一个窗口类,然后创建了一个窗口。接下来,我们进入一个消息循环,不断地从 GetMessage 函数中获取窗口消息。当收到 WM_QUIT 消息时,我们退出消息循环。对于其他消息,我们使用 DefWindowProc 函数处理它们。在这个简单的示例中,我们只处理了 WM_DESTROY 消息,但你可以根据需要处理其他消息。

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