public partial class Form2 : Form

{

protected override CreateParams CreateParams

{

get

{

CreateParams cp = base.CreateParams;

cp.ExStyle |= (int)0x08000000L;

return cp;

}

}

public Form2()

{

InitializeComponent();

}

// 屏幕小键盘上的一个按钮“A”

private void button1_Click(object sender, EventArgs e)

{

SendKeys.Send("A");

}

}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
//download by http://www.codefans.net
namespace TouchKey
{
public partial class Form1 : Form
{
private const int WS_EX_NOACTIVATE = 0x08000000;
private const int WM_MOUSEACTIVATE = 0x0021;
private const int MA_NOACTIVATE = 0x0003;

protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= WS_EX_NOACTIVATE;
return cp;
}

}

protected override void WndProc(ref Message m)
{
//If we're being activated because the mouse clicked on us...
if (m.Msg == WM_MOUSEACTIVATE)
{
//Then refuse to be activated, but allow the click event to pass through (don't use MA_NOACTIVATEEAT)
m.Result = (IntPtr)MA_NOACTIVATE;
}
else
{
base.WndProc(ref m);
}
}

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
lbl_0.Click += new EventHandler(lbl_Click);
lbl_1.Click += new EventHandler(lbl_Click);
lbl_2.Click += new EventHandler(lbl_Click);
lbl_3.Click += new EventHandler(lbl_Click);
lbl_4.Click += new EventHandler(lbl_Click);
lbl_5.Click += new EventHandler(lbl_Click);
lbl_6.Click += new EventHandler(lbl_Click);
lbl_7.Click += new EventHandler(lbl_Click);
lbl_8.Click += new EventHandler(lbl_Click);
lbl_9.Click += new EventHandler(lbl_Click);
lbl_Q.Click += new EventHandler(lbl_Click);
lbl_W.Click += new EventHandler(lbl_Click);
lbl_R.Click += new EventHandler(lbl_Click);
lbl_E.Click += new EventHandler(lbl_Click);
lbl_T.Click += new EventHandler(lbl_Click);
lbl_Y.Click += new EventHandler(lbl_Click);
lbl_U.Click += new EventHandler(lbl_Click);
lbl_I.Click += new EventHandler(lbl_Click);
lbl_O.Click += new EventHandler(lbl_Click);
lbl_P.Click += new EventHandler(lbl_Click);
lbl_A.Click += new EventHandler(lbl_Click);
lbl_S.Click += new EventHandler(lbl_Click);
lbl_D.Click += new EventHandler(lbl_Click);
lbl_F.Click += new EventHandler(lbl_Click);
lbl_G.Click += new EventHandler(lbl_Click);
lbl_H.Click += new EventHandler(lbl_Click);
lbl_J.Click += new EventHandler(lbl_Click);
lbl_K.Click += new EventHandler(lbl_Click);
lbl_L.Click += new EventHandler(lbl_Click);
lbl_Z.Click += new EventHandler(lbl_Click);
lbl_X.Click += new EventHandler(lbl_Click);
lbl_C.Click += new EventHandler(lbl_Click);
lbl_V.Click += new EventHandler(lbl_Click);
lbl_B.Click += new EventHandler(lbl_Click);
lbl_N.Click += new EventHandler(lbl_Click);
lbl_M.Click += new EventHandler(lbl_Click);
lbl_BACKSPACE.Click +=new EventHandler(lbl_Click);
}

void lbl_Click(object sender, EventArgs e)
{
Label l = (Label)sender;
string strkey = l.Name.Substring(4);
if (label9.Text == "大写")
{
strkey = strkey.ToUpper();
}
else
{
strkey = strkey.ToLower();
}
SendKeys.Send("{" + strkey + "}");
}

private void label1_Click(object sender, EventArgs e)
{
Close();
}

private void label9_Click(object sender, EventArgs e)
{
if (label9.Text =="大写")
{
label9.Text = "小写";
}
else
{
label9.Text = "大写";
}
}
}
}

private void btnKeybord_Click(object sender, EventArgs e)
{
Form1 f = new Form1();
tbcontent.Focus();
f.Show();
this.Activate();
}