unity3d 控制鼠标的移动范围

在一些论坛上看到有人问在unity里面控制鼠标的移动范围，有二种方法，一个是调用windows 系统的 user32.dll的ClipCursor函数 

再一种就是 通过Cursor.SetCursor函数

这里就介绍一下 第一种方法吧，不说废话了  直接上代码

 

[DllImport( "user32.dll", CharSet = CharSet.Auto, ExactSpelling = true )]
[return: MarshalAs( UnmanagedType.Bool )]
public static extern bool ClipCursor( ref RECT rcClip );
[DllImport( "user32.dll" )]
[return: MarshalAs( UnmanagedType.Bool )]
public static extern bool GetClipCursor( out RECT rcClip );
[DllImport( "user32.dll" )]
static extern int GetForegroundWindow( );
[DllImport("user32.dll")]
[return: MarshalAs( UnmanagedType.Bool )]
static extern bool GetWindowRect( int hWnd, ref RECT lpRect );
 
[StructLayout( LayoutKind.Sequential )]
public struct RECT
{
    public int Left;
    public int Top;
    public int Right;
    public int Bottom;
    public RECT( int left, int top, int right, int bottom )
    {
        Left = left;
        Top = top;
        Right = right;
        Bottom = bottom;
    }
}
 
RECT currentClippingRect;
RECT originalClippingRect = new RECT( );
 
void Start()
{
    hndl = GetForegroundWindow( );
    GetWindowRect( hndl, ref currentClippingRect );
    GetClipCursor( out originalClippingRect );
    ClipCursor( ref currentClippingRect);
}
 
void OnApplicationQuit()
{
    ClipCursor( ref originalClippingRect );
}