Unity中将游戏窗口置于任务栏上方的实现方法求助

你的问题核心在于窗口最大化操作覆盖了手动位置设置，加上部分Win32 API参数类型不兼容64位环境，导致修改SetWindowPos的y值无效。以下是具体修正方案：

问题根源拆解 #

• ShowWindowAsync(3)（窗口最大化）会让系统接管窗口布局，手动设置的x/y坐标被直接覆盖
• GetActiveWindow无法保证获取到Unity主窗口句柄，可能导致API调用失效
• 原代码使用int处理窗口句柄，在64位系统下会出现截断错误

修正后的完整代码 #

using UnityEngine;
using System;
using System.Runtime.InteropServices;
using System.Diagnostics;

public class TransparentWindow : MonoBehaviour
{
    [DllImport("user32.dll", EntryPoint = "SetWindowLongPtrA")]
    static extern IntPtr SetWindowLongPtr(IntPtr hwnd, int nIndex, IntPtr dwNewLong);
    [DllImport("user32.dll")]
    static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
    [DllImport("user32.dll", EntryPoint = "SetLayeredWindowAttributes")]
    static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);
    [DllImport("user32.dll", EntryPoint = "GetWindowLongPtrA")]
    private static extern IntPtr GetWindowLongPtr(IntPtr hwnd, int nIndex);
    [DllImport("user32.dll", EntryPoint = "SetWindowPos")]
    private static extern bool SetWindowPos(IntPtr hwnd, IntPtr hwndInsertAfter, int x, int y, int cx, int cy, uint uFlags);
    [DllImport("user32.dll")]
    private static extern IntPtr GetForegroundWindow();

    // Win32常量定义
    const uint LWA_COLORKEY = 0x00000001;
    static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
    const int GWL_STYLE = -16;
    const int GWL_EXSTYLE = -20;
    const uint WS_CAPTION = 0x00C00000;
    const uint WS_HSCROLL = 0x00100000;
    const uint WS_VSCROLL = 0x00200000;
    const uint WS_SYSMENU = 0x00080000;
    const uint WS_EX_LAYERED = 0x00080000;
    const uint SWP_FRAMECHANGED = 0x0020;
    const uint SWP_SHOWWINDOW = 0x0040;
    const uint SWP_NOOWNERZORDER = 0x0200;

    void Start()
    {
        // 获取Unity主窗口句柄，替代不可靠的GetActiveWindow
        IntPtr handle = Process.GetCurrentProcess().MainWindowHandle;
        if (handle == IntPtr.Zero) handle = GetForegroundWindow();

        int screenWidth = Screen.currentResolution.width;
        int windowHeight = Screen.currentResolution.height / 10;

        // 移除标题栏及滚动条样式
        IntPtr currentStyle = GetWindowLongPtr(handle, GWL_STYLE);
        currentStyle = (IntPtr)((long)currentStyle & ~(long)(WS_CAPTION | WS_HSCROLL | WS_VSCROLL | WS_SYSMENU));
        SetWindowLongPtr(handle, GWL_STYLE, currentStyle);

        // 设置分层透明属性
        IntPtr exStyle = GetWindowLongPtr(handle, GWL_EXSTYLE);
        exStyle = (IntPtr)((long)exStyle | (long)WS_EX_LAYERED);
        SetWindowLongPtr(handle, GWL_EXSTYLE, exStyle);
        SetLayeredWindowAttributes(handle, 0, 0, LWA_COLORKEY);

        // 强制窗口置顶并固定位置（y=0贴屏幕顶部，避开底部任务栏）
        SetWindowPos(handle, HWND_TOPMOST, 0, 0, screenWidth, windowHeight, SWP_FRAMECHANGED | SWP_SHOWWINDOW | SWP_NOOWNERZORDER);

        // 匹配Unity分辨率到窗口大小，禁用全屏模式
        Screen.SetResolution(screenWidth, windowHeight, false);
    }
}

关键改动说明 #

1. 可靠获取窗口句柄：用Process.GetCurrentProcess().MainWindowHandle直接定位Unity主窗口，避免句柄错误
2. 64位兼容修正：改用SetWindowLongPtrA/GetWindowLongPtrA和IntPtr类型处理句柄，避免32位/64位环境下的类型截断
3. 移除最大化操作：删除ShowWindowAsync(3)，让手动设置的x/y坐标生效
4. 固定窗口位置：将y值设为0，让窗口紧贴屏幕顶部，自然避开底部任务栏；HWND_TOPMOST确保窗口始终在普通窗口上方

内容的提问来源于stack exchange，提问作者alperrakn