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   源码介绍

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实现数字软键盘

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Media;
using System.Runtime.InteropServices;

namespace MyControls
{
    public partial class KeyB : Form
    {
        SoundPlayer sp = new SoundPlayer(Properties.Resources.Click2);
        private bool _show;
        public KeyB()
        {
            InitializeComponent();
            _show = false;
        }
        private void KeyB_Load(object sender, EventArgs e)
        {
            num_0.Click = new EventHandler(NumClick);
            num_1.Click = new EventHandler(NumClick);
            num_2.Click = new EventHandler(NumClick);
            num_3.Click = new EventHandler(NumClick);
            num_4.Click = new EventHandler(NumClick);
            num_5.Click = new EventHandler(NumClick);
            num_6.Click = new EventHandler(NumClick);
            num_7.Click = new EventHandler(NumClick);
            num_8.Click = new EventHandler(NumClick);
            num_9.Click = new EventHandler(NumClick);
        }
        
        #region 按键效果
        private void num_1_MouseDown(object sender, MouseEventArgs e)
        {
            num_1.Image = imageList1.Images[0];
        }

        private void num_1_MouseUp(object sender, MouseEventArgs e)
        {
            num_1.Image = Properties.Resources.n_1;
        }

        private void num_2_MouseDown(object sender, MouseEventArgs e)
        {
            num_2.Image = imageList1.Images[1];
        }

        private void num_2_MouseUp(object sender, MouseEventArgs e)
        {
            num_2.Image = Properties.Resources.n_2;
        }

        private void num_3_MouseDown(object sender, MouseEventArgs e)
        {
            num_3.Image = imageList1.Images[2];
        }

        private void num_3_MouseUp(object sender, MouseEventArgs e)
        {
            num_3.Image = Properties.Resources.n_3;
        }

        private void num_4_MouseDown(object sender, MouseEventArgs e)
        {
            num_4.Image = imageList1.Images[3];
        }

        private void num_4_MouseUp(object sender, MouseEventArgs e)
        {
            num_4.Image = Properties.Resources.n_4;
        }

        private void num_5_MouseDown(object sender, MouseEventArgs e)
        {
            num_5.Image = imageList1.Images[4];
        }

        private void num_5_MouseUp(object sender, MouseEventArgs e)
        {
            num_5.Image = Properties.Resources.n_5;
        }

        private void num_6_MouseDown(object sender, MouseEventArgs e)
        {
            num_6.Image = imageList1.Images[5];
        }

        private void num_6_MouseUp(object sender, MouseEventArgs e)
        {
            num_6.Image = Properties.Resources.n_6;
        }

        private void num_7_MouseDown(object sender, MouseEventArgs e)
        {
            num_7.Image = imageList1.Images[6];
        }

        private void num_7_MouseUp(object sender, MouseEventArgs e)
        {
            num_7.Image = Properties.Resources.n_7;
        }

        private void num_8_MouseDown(object sender, MouseEventArgs e)
        {
            num_8.Image = imageList1.Images[7];
        }

        private void num_8_MouseUp(object sender, MouseEventArgs e)
        {
            num_8.Image = Properties.Resources.n_8;
        }

        private void num_9_MouseDown(object sender, MouseEventArgs e)
        {
            num_9.Image = imageList1.Images[8];
        }

        private void num_9_MouseUp(object sender, MouseEventArgs e)
        {
            num_9.Image = Properties.Resources.n_9;
        }

        private void num_0_MouseDown(object sender, MouseEventArgs e)
        {
            num_0.Image = imageList1.Images[9];
        }

        private void num_0_MouseUp(object sender, MouseEventArgs e)
        {
            num_0.Image = Properties.Resources.n_0;
        }

        private void back_MouseDown(object sender, MouseEventArgs e)
        {
            back.Image = imageList1.Images[10];
        }

        private void back_MouseUp(object sender, MouseEventArgs e)
        {
            back.Image = Properties.Resources.backspace;
        }
        #endregion
        #region 系统调用
        public static class Win32API
        {
            [DllImport("user32.dll", EntryPoint = "SendMessageW")]
            public static extern int SendMessage(
                 int hwnd,
                 int wMsg,
                 int wParam,
                 int lParam);

            [DllImport("user32.dll", EntryPoint = "PostMessageW")]
            public static extern int PostMessage(
                 int hwnd,
                 int wMsg,
                 int wParam,
                 int lParam);

            [DllImport("user32.dll")]
            public static extern int GetForegroundWindow();

            [DllImport("user32.dll")]
            public static extern int GetFocus();

            [DllImport("user32.dll")]
            public static extern int AttachThreadInput(
                 int idAttach,
                 int idAttachTo,
                 int fAttach);

            [DllImport("user32.dll")]
            public static extern int GetWindowThreadProcessId(
                 int hwnd,
                 int lpdwProcessId);

            [DllImport("kernel32.dll")]
            public static extern int GetCurrentThreadId();

            public const int WM_MOUSEACTIVATE = 0x21;
            public const int WM_KEYDOWN = 0x100;
            public const int MA_NOACTIVATE = 3;
            public const int WS_EX_NOACTIVATE = 0x8000000;
        }
        #endregion
        private void AttachThreadInput(bool b)
        {
            //设置线程亲和,附到前台窗口所在线程,只有在线程内才可以获取线程内控件的焦点
            //线程亲和: AttachThreadInput(目标线程标识, 当前线程标识, 非零值关联) 零表示取消
            //窗口所在的线程的标识: GetWindowThreadProcessId(窗体句柄, 这里返回进程标识)
            //当前的前台窗口的句柄: GetForegroundWindow()
            //当前程序所在的线程标识: GetCurrentThreadId()
            Win32API.AttachThreadInput(
                   Win32API.GetWindowThreadProcessId(
                            Win32API.GetForegroundWindow(), 0),
                   Win32API.GetCurrentThreadId(), Convert.ToInt32(b));
        }
        /// <summary>
        /// 数字键点击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void NumClick(object sender, EventArgs e)
        {
            sp.Play();
            AttachThreadInput(true); //设置线程亲和的关联
            int getFocus = Win32API.GetFocus();
            //o为object类型,使用强制转换成vkButton
            char keyvalue = ((PictureBox)sender).Name.Substring(4, 1).ToCharArray()[0];
            //向前台窗口发送按键消息
            Win32API.PostMessage(getFocus, Win32API.WM_KEYDOWN, (byte)keyvalue, 0);
            AttachThreadInput(false); //取消线程亲和的关联
        }
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);
            //若在窗体上产生鼠标点击事件的消息则使消息返回值标记为不激活
            //程序内部的窗口切换仅需返回 MA_NOACTIVATE 即可,若相对其它
            //的程序窗口切换时 还需要设置 WS_EX_NOACTIVATE 样式
            if (m.Msg == Win32API.WM_MOUSEACTIVATE)
                m.Result = (IntPtr)Win32API.MA_NOACTIVATE;
            //MA_ACTIVATE 激活窗体，但不删除鼠标消息。
            //MA_NOACTIVATE 不激活窗体，也不删除鼠标消息。
            //MA_ACTIVATEANDEAT 激活窗体，删除鼠标消息。
            //MA_NOACTIVATEANDEAT 不激活窗体，但删除鼠标消息。
        }

        private const int WS_EX_TOOLWINDOW = 0x00000080;
        private const int WS_EX_NOACTIVATE = 0x08000000;

        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cp = base.CreateParams;
                cp.ExStyle |= (WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW);
                cp.Parent = IntPtr.Zero; // Keep this line only if you used UserControl
                return cp;

                //return base.CreateParams;
            }
        } 

        //protected override CreateParams CreateParams
        //{
        //    get
        //    {
        //        CreateParams cp = base.CreateParams;
        //        //为窗体样式添加不激活标识
        //        cp.ExStyle = Win32API.WS_EX_NOACTIVATE;
        //        return cp;
        //    }
        //}
        //关闭键盘
        private void close_Click(object sender, EventArgs e)
        {
            _show = false;
            sp.Play();
            this.Hide();
        }
        //退格操作
        private void back_Click(object sender, EventArgs e)
        {
            sp.Play();
            AttachThreadInput(true); //设置线程亲和的关联
            int getFocus = Win32API.GetFocus();
            //向前台窗口发送按键消息
            Win32API.PostMessage(getFocus, Win32API.WM_KEYDOWN, 0X08, 0);
            AttachThreadInput(false); //取消线程亲和的关联
        }
        public void btnshow()
        {
            if (!_show)
            {
                this.Show();
                _show = true;
            }
        }

        private void KeyB_FormClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = true;
        }
    }
}