WinForm特效:同时让两个窗体有激活效果

最新推荐文章于 2025-12-05 09:31:03 发布

原创最新推荐文章于 2025-12-05 09:31:03 发布 · 525 阅读

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文章标签：

#winform #object #button #null #windows #system

本文介绍了一个使用C#实现的Windows窗体应用程序示例，该示例演示了如何在一个窗体被激活时通过Windows API向另一个窗体发送消息。通过调用`SendMessage`函数并指定特定的消息类型和参数，可以实现窗体间的交互。

windows api，一个窗体激活的时候给另外一个发消息

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using System;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace WindowsApplication43

{

    public partial class Form1 : Form

    {

        Form frm =null;

        public Form1()

        {

            InitializeComponent();

            this.Activated += Form_Activated;

        }

        const int WM_NCACTIVATE = 0x86;

        const int WA_ACTIVE = 0x1;

        [DllImport("user32.dll", EntryPoint = "SendMessage")]

        public static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);

        private void button1_Click(object sender, EventArgs e)

        {

            frm = new Form();

            frm.Text = "jinjazz";

            frm.Activated += Form_Activated;

            frm.Show();

            frm.Location = new System.Drawing.Point(this.Left + this.Width, this.Top);

            SendMessage(this.Handle, WM_NCACTIVATE, WA_ACTIVE, 0);

        }

        void Form_Activated(object sender, EventArgs e)

        {

            SendMessage(this.Handle, WM_NCACTIVATE, WA_ACTIVE, 0);

            if (frm != null)

                SendMessage(frm.Handle, WM_NCACTIVATE, WA_ACTIVE, 0);

        }

    }

}