unity 桌面程序

using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using UnityEngine;

public class chuantou : MonoBehaviour
{
[DllImport(“user32.dll”)]
public static extern int MessageBox(IntPtr hwnd,string text,string caption,uint type);
private struct MARGINS
{
public int cxLeftWidth;
public int cxRightWidth;
public int cxTopHeight;
public int cxButtomHeight;
}

[DllImport("user32.dll")]
private static extern IntPtr GetActiveWindow();
[DllImport("Dwmapi.dll")]
private static extern uint DwmExtendFrameIntoClientArea(IntPtr hWnd,ref MARGINS margins);

[DllImport("user32.dll")] //窗口属性
private static extern int SetWindowLong(IntPtr hWnd,int nIndex,uint dwNewLong);
[DllImport("user32.dll",SetLastError =true)] //设置位置置顶
private static extern int SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

[DllImport("user32.dll")]//设置透明层级
private static extern int SetLayeredWindowAttributes(IntPtr hWnd, uint crKey,byte bAlpha,uint dwFlags);

const int GWL_EXSTYLE = -20;
const uint WS_EX_LAYERED = 0X00080000;
const uint WS_EX_TRANSPARENT = 0X00000020;

static readonly IntPtr HWND_TOPMOST=new IntPtr(-1);
const uint LWA_COLORKEY = 0X00000001;


IntPtr hwnd;
void Start()
{



     hwnd = GetActiveWindow();

    MARGINS margins = new MARGINS { cxLeftWidth = -1 };
    DwmExtendFrameIntoClientArea(hwnd, ref margins);

    SetWindowLong(hwnd,GWL_EXSTYLE,WS_EX_LAYERED);

    SetLayeredWindowAttributes(hwnd, 0, 0, LWA_COLORKEY);

    SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, 0);

  
  

    Application.runInBackground = true;
}

// Update is called once per frame
void Update()
{
    this.transform.RotateAround(Vector3.zero,new Vector3(0,1,0),0.5f);
}
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}