用C#给程序加启动画面并只允许一个应用程序实例运行

1.启动画面

 

public class SplashForm : System.Windows.Forms.Form

     {

         private System.Windows.Forms.PictureBox pictureBox1;

         private System.Windows.Forms.Label label1;

         private System.Windows.Forms.Label lbl_version;

         /// <summary>

         /// 必需的设计器变量。

         /// </summary>

          private System.ComponentModel.Container components = null;


         public SplashForm()

         {

              //

              // Windows 窗体设计器支持所必需的

              //

              InitializeComponent();

              lbl_version.Text = "版本：" + Application.ProductVersion;



              //

              // TODO: 在 InitializeComponent 调用后添加任何构造函数代码

              //

     }

     //以下省略

2

using System; 

using System.Drawing; 

using System.Collections; 

using System.ComponentModel; 

using System.Windows.Forms; 

using System.Data; 

using System.Runtime.InteropServices; 

using System.Diagnostics; 

using System.Reflection; 

using System.IO;



namespace Heroic.TempAnalyse.TempGui 

{ 

     /// <summary> 

     /// AppLoader 的摘要说明。 

     /// </summary> 

     public class AppLoader 

     { 

         private static ApplicationContext context; 

         private static SplashForm sForm = new SplashForm(); 

         private static MainWindow mForm = null; 

         //0不可见但仍然运行,1居中,2最小化,3最大化 

         private const int WS_SHOWNORMAL = 3; 



         [STAThread]   

         static void Main(string[] args)   

         {      

              // [8/12/2004]用于更新该程序。

              doUpData();

              // [7/19/2004] 改变顺序,目的使得开始加载速度加快 

              //得到正在运行的例程 

              Process instance = RunningInstance(); 

              if(instance == null) 

              { 

                   sForm.Show(); 

                   mForm = new MainWindow(); 

                   context = new ApplicationContext();      

                   Application.Idle += new EventHandler(OnAppIdle); 

                   Application.Run(context); 

              } 

              else 

              { 

                   //处理发现的例程 

                   HandleRunningInstance(instance); 

                   //MessageBox.Show("当前程序已经运行了!"); 

              } 

         } 

//在线更新用，不再本文范围

         private static void doUpData()

         {    

              System.Diagnostics.Process.Start(Application.StartupPath+@"\update.exe",Application.StartupPath+@"\Heroic.TempAnalyse.TempGui.exe 0");//       

         }


         private static void OnAppIdle(object sender, EventArgs e)   

         { 

              if(context.MainForm == null)      

              { 

                   Application.Idle -= new EventHandler(OnAppIdle);                

                   mForm.PreLoad(); 

                   context.MainForm = mForm; 

                   context.MainForm.Show();         

                   sForm.Close();         

                   sForm = null;      

              }   

         } 

         //不允许有两个程序同时启动

         public static Process RunningInstance() 

         { 

              Process current = Process.GetCurrentProcess(); 

              Process[] processes = Process.GetProcessesByName (current.ProcessName); 

              //遍历正在有相同名字运行的例程 

              foreach (Process process in processes) 

              { 

                   //忽略现有的例程 

                   if (process.Id != current.Id) 

                   { 

                       //确保例程从EXE文件运行 

                       if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == 

                            current.MainModule.FileName) 

                       { 

                            //返回另一个例程实例 

                            return process; 

                       } 

                   } 

              } 

              //没有其它的例程，返回Null 

              return null; 

         } 


         public static void HandleRunningInstance(Process instance) 

         { 

              //确保窗口没有被最小化或最大化 

              ShowWindowAsync (instance.MainWindowHandle , WS_SHOWNORMAL); 


              //设置真实例程为foreground window 

              SetForegroundWindow (instance.MainWindowHandle); 

         } 


         [DllImport("User32.dll")] 


         private static extern bool ShowWindowAsync( 

              IntPtr hWnd, int cmdShow); 

         [DllImport("User32.dll")] private static extern bool 

              SetForegroundWindow(IntPtr hWnd); 

     } 

}

3、 加载完毕正式运行后的类：

         public void PreLoad()

         {

              //   如果已经加载毕，则返回

              if (_Loaded)

                   return;



              //   把机器生成的代码放到这里

              initCustomControl();


              _Loaded = true;


         }


         //   是否加载完毕

         private bool _Loaded = false;


         protected override void OnLoad(EventArgs e)

         {

              //   确保 PreLoad()函数已经调用

              if (!_Loaded)

                   throw new InvalidOperationException("Must call PreLoad before calling this function.");



         }