需呼叫API函式

需在開頭引入名稱空間
using System.Runtime.InteropServices;

1、通過視窗名字查詢

[DllImport("user32.dll", EntryPoint = "FindWindow")]
public static extern IntPtr FindWindow(string lp1, string lp2);

示例：

IntPtr hWnd = FindWindow(null, "abc");

2、對視窗進行在工作列隱藏和開啟操作

[DllImport("user32.dll", EntryPoint = "ShowWindow")]
public static extern IntPtr ShowWindow(IntPtr hWnd, int _value);

0    隱藏視窗到後臺

1    正常大小顯示視窗

3、獲取當前焦點視窗的控制代碼

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern IntPtr GetForegroundWindow();

使用方法 :   IntPtr myPtr=GetForegroundWindow();

4、獲取到該視窗控制代碼後,可以對該視窗進行操作

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);

使用例項:    ShowWindow(myPtr, 0);

0    關閉視窗

1    正常大小顯示視窗

2    最小化視窗

3    最大化視窗

5、獲取視窗大小，及螢幕座標

[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;                             //最左座標
            public int Top;                             //最上座標
            public int Right;                           //最右座標
            public int Bottom;                        //最下座標
        }

示例：                 

                   InPtr awin = GetForegroundWindow();    //獲取當前視窗

                   RECT rect = new RECT();
                   GetWindowRect(awin, ref rect);
                   int width = rect.Right - rect.Left;                        //視窗的寬度
                   int height = rect.Bottom - rect.Top;                   //視窗的高度