[DllImport("user32.dll")]

[return: MarshalAs(UnmanagedType.Bool)]

static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect);

[StructLayout(LayoutKind.Sequential)]

public struct RECT

        {

            public int Left; //最左坐标

            public int Top; //最上坐标

            public int Right; //最右坐标

            public int Bottom; //最下坐标

        }

//飞信示例:

RECT fx = new RECT();

GetWindowRect(h, ref fx);//h为窗口句柄

int width = fx.Right - fx.Left;                        //窗口的宽度

int height = fx.Bottom - fx.Top;                   //窗口的高度

int x = fx.Left;

int y = fx.Top;