using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace Test
{
  public partial class PlayVoice : Form
  {
    public PlayVoice()
    {
      InitializeComponent();
    }
    [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "GetForegroundWindow", CharSet = System.Runtime.InteropServices.CharSet.Auto, ExactSpelling = true)]
    public static extern IntPtr GetF(); //获得本窗体的句柄
    [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
    public static extern bool SetF(IntPtr hWnd); //设置此窗体为活动窗体
    private void timer1_Tick(object sender, EventArgs e)
    {
      if (this.Handle != GetF()) //如果本窗口没有获得焦点
        SetF(this.Handle); //设置本窗口获得焦点
    }
  }
}