用C#实现了一个切换当前活动窗口的功能
说明，按钮一打开播放器，按钮二实现切换播放器为活动窗口并代替键盘按下CTRL+U。代码如下：
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Diagnostics;namespace testKMPlayerWinForm{ public partial class Form1 : Form { public static extern bool SetForegroundWindow(IntPtr hWnd); System.Diagnostics.Process Proc; String pn; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Proc = new System.Diagnostics.Process(); Proc.StartInfo.FileName = "C:/Program Files/The KMPlayer/KMPlayer.exe"; Proc.Start(); pn = Proc.ProcessName; System.Threading.Thread.Sleep(1000); SendKeys.Send("^u"); } private void button2_Click(object sender, EventArgs e) { System.Diagnostics.Process[] p = System.Diagnostics.Process.GetProcessesByName(pn); if (p.Length > 0) { SetForegroundWindow(p.MainWindowHandle); System.Threading.Thread.Sleep(1000); SendKeys.Send("^u"); } else { button1_Click(sender, e); } } }}
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