Creating custom pop up keyboard nothing happen when keys are press

Question

What I want to happen is that when a textbox is clicked a pop up keyboard will show and whatever i type on the keyboard will be putt in the textbox, but nothing happen but when I use notepad, it works. How can I fix this?

Here is my main form code:

    private void textBox1_MouseClick(object sender, MouseEventArgs e)
    {
        Form1 frm1 = new Form1();
        frm1.ShowDialog();
    }

And here is my code for pop up keyboard

public partial class Form1 : Form
{
    const int WS_EX_NOACTIVATE = 0x08000000;
//this line of code fixed the issue
[DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
        public static extern IntPtr GetDesktopWindow();

    public Form1()
    {
        InitializeComponent();
    }

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams param = base.CreateParams;
            param.ExStyle |= WS_EX_NOACTIVATE;


//This line of code fix the issues
param.Style = 0x40000000 | 0x4000000;
                param.Parent = GetDesktopWindow();

            return param;
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        SendKeys.Send("1");
    }

    private void button3_Click(object sender, EventArgs e)
    {
        SendKeys.Send("2");
    }

    private void button4_Click(object sender, EventArgs e)
    {
        SendKeys.Send("3");
    }

    private void button2_Click(object sender, EventArgs e)
    {

    }
}

Answer 1

使用form1.Show() ...而不是ShowDialog()

Answer 2

If you manually added the testbox make sure you hook into the MouseEventHandler like so:

this.textBox1.MouseClick += new System.Windows.Forms.MouseEventHandler(this.textBox1_MouseClick);

when your form loads.

Answer 3

I fixed the issue by just adding this line of code

[DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
    public static extern IntPtr GetDesktopWindow();

And

                param.Style = 0x40000000 | 0x4000000;
            param.Parent = GetDesktopWindow();