c# 使用api函数 ShowWindowAsync 控制窗体_.NET_编程开发_程序员俱乐部

1.需要匯入class="Apple-converted-space"> System.Runtime.InteropServices 命名空間

2.宣告 ShowWindowAsync 函數

        [DllImport("user32.dll")]

        private static extern bool ShowWindowAsync(

            IntPtr hWnd,

            int nCmdShow

        );

3.宣告 ShowWindow函數

        [DllImport("user32.dll")]

        public static extern int ShowWindow(

            int hwnd,

            int nCmdShow

        );

4.宣告API常數定義

        //API 常數定義

        private const int SW_HIDE = 0;

        private const int SW_NORMAL = 1;

        private const int SW_MAXIMIZE = 3;

        private const int SW_SHOWNOACTIVATE = 4;

        private const int SW_SHOW = 5;

        private const int SW_MINIMIZE = 6;

        private const int SW_RESTORE = 9;

        private const int SW_SHOWDEFAULT = 10;

5.上述函數功能相同，都是用來設定視窗大小，不同的是宣告的型態不一樣需轉型。

ShowWindowAsync(this.Handle, SW_MINIMIZE);

ShowWindow((int)this.Handle, SW_MINIMIZE);

6.若是把int 改成IntPtr ，使用ShowWindow就不用轉型，所以在宣告時就可以考慮資料型態，必免轉型所耗的資源。

        [DllImport("user32.dll")]

        public static extern int ShowWindow(

            int hwnd,

            int nCmdShow

        );

C#完整範例

using System;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace CS_WindowsResize

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        //API 常數定義

        private const int SW_HIDE = 0;

        private const int SW_NORMAL = 1;

        private const int SW_MAXIMIZE = 3;

        private const int SW_SHOWNOACTIVATE = 4;

        private const int SW_SHOW = 5;

        private const int SW_MINIMIZE = 6;

        private const int SW_RESTORE = 9;

        private const int SW_SHOWDEFAULT = 10;

        [DllImport("user32.dll")]

        private static extern bool ShowWindowAsync(

            IntPtr hWnd,

            int nCmdShow

        );

        [DllImport("user32.dll")]

        public static extern int ShowWindow(

            int hwnd,

            int nCmdShow

        );

        private void button1_Click(object sender, EventArgs e)

        {

            //最小化

            ShowWindowAsync(this.Handle, SW_MINIMIZE);

        }

        private void button2_Click(object sender, EventArgs e)

        {

            //最大化

            ShowWindowAsync(this.Handle, SW_MAXIMIZE);

        }

        private void button3_Click(object sender, EventArgs e)

        {

            //還原

            ShowWindowAsync(this.Handle, SW_RESTORE);

        }

        private void button4_Click(object sender, EventArgs e)

        {

            //最小化

            ShowWindow((int)this.Handle, SW_MINIMIZE);

        }

        private void button5_Click(object sender, EventArgs e)

        {

            //最大化

            ShowWindow((int)this.Handle, SW_MAXIMIZE);

        }

        private void button6_Click(object sender, EventArgs e)

        {

            //還原

            ShowWindow((int)this.Handle, SW_RESTORE);

        }

    }

}

转载自：http://www.dotblogs.com.tw/yc421206/archive/2009/07/06/9140.aspx