[DllImport("user32.dll", EntryPoint = "SetParent")]
private static extern int SetParent(int hWndChild,int hWndNewParent);
[DllImport("user32.dll", EntryPoint = "FindWindowA")]
private static extern IntPtr FindWindowA(string lpClassName, string lpWindowName);
[DllImport("user32.dll", EntryPoint = "FindWindowExA")]
private static extern IntPtr FindWindowExA(IntPtr hWndParent, IntPtr hWndChildAfter, string lpszClass, string lpszWindow);
[DllImport("user32.dll", EntryPoint = "GetClassNameA")]
private static extern IntPtr GetClassNameA(IntPtr hWnd, IntPtr lpClassName, int nMaxCount);
[DllImport("user32.dll", EntryPoint = "GetParent")]
private static extern IntPtr GetParent(IntPtr hWnd);
 
public static void SetFather(Form form)
{
    SetParent((int)form.Handle, GetBackground());
}
 
private static int GetBackground()
{
    unsafe
    {
        IntPtr background = IntPtr.Zero;
        IntPtr father = FindWindowA("progman", "Program Manager");
        IntPtr workerW = IntPtr.Zero;
        do
        {
            workerW = FindWindowExA(IntPtr.Zero, workerW, "workerW", null);
            if (workerW != IntPtr.Zero)
            {
                char[] buff = new char[200];
                IntPtr b = Marshal.UnsafeAddrOfPinnedArrayElement(buff, 0);
                int ret = (int)GetClassNameA(workerW, b, 400);
                if (ret == 0) throw new Exception("出錯(cuò)");
            }
            if (GetParent(workerW) == father)
            {
                background = workerW;
            }
        } while (workerW != IntPtr.Zero);
        return (int)background;
    }
}

private void Form1_Load(object sender, EventArgs e)
{
    main = new VideoForm();
    player = main.player;
    Window.SetFather(main);
    main.Show();
}
private void button1_Click(object sender, EventArgs e)//打開
{
    OpenFileDialog open = new OpenFileDialog();
    open.Filter = "媒體文件(所有類型)|*.mp4;*.mpeg;*.wma;*.wmv;*.wav;*.avi|所有文件|*.*";
    if (open.ShowDialog() == DialogResult.OK)
    {
        player.URL = open.FileName;
    }
}
 
private void button2_Click(object sender, EventArgs e)//播放
{
    player.Ctlcontrols.play();
}
 
private void button3_Click(object sender, EventArgs e)//暫停
{
    player.Ctlcontrols.pause();
}
 
private void button4_Click(object sender, EventArgs e)//退出
{
    main.Dispose();
    System.Environment.Exit(0);
}

[DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]
public static extern int SystemParametersInfo(int uAction, int uParam, StringBuilder lpvParam, int fuWinIni);
 
public static bool Refresh()
{
    StringBuilder wallpaper = new StringBuilder(200);
    SystemParametersInfo(0x73, 200, wallpaper, 0);
    int ret = SystemParametersInfo(20, 1, wallpaper, 3);
    if(ret != 0)
    {
        RegistryKey hk = Registry.CurrentUser;
        RegistryKey run = hk.CreateSubKey(@"Control Panel\Desktop\");
        run.SetValue("Wallpaper", wallpaper.ToString());
        return true;
    }
    return false;
}

private void button4_Click(object sender, EventArgs e)//退出
{
    main.Hide();
    this.Hide();
    Window.Refresh();
    main.Dispose();
    System.Environment.Exit(0);
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    e.Cancel = true;
    this.Hide();
}

private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
{
    this.Show();
}