[C#]激活并刷新已运行例程 --> EXE

本文介绍如何在程序入口处控制运行一次EXE，再次启动只会激活并刷新已运行例程。
刷新数据通过启动参数来传递，本文启动参数传递的是一个文件路径，详看代码：

 

入口处:

static class Program { ///

/// 应用程序的主入口点。 ///

[STAThread] static void Main( string[] args ) { Application.EnableVisualStyles( ); Application.SetCompatibleTextRenderingDefault( false ); //通过启动参数获取文件路径 string filePath = string.Empty; if ( args.Length > 0 ) { filePath = args[0]; for ( int i = 1 ; i < args.Length ; i++ ) { filePath += string.Format( " {0}" , args[i] ); } } //获取当前例程 Process instance = RunningInstance( ); if ( instance == null ) //第一次启动 { if ( string.IsNullOrEmpty( filePath ) ) { Application.Run( new FrmMain( "default path.." ) ); } else { Application.Run( new FrmMain( filePath ) ); } } else //已有例程在运行，激活并传送数据 { if ( !string.IsNullOrEmpty( filePath ) ) { IntPtr strPtr = Marshal.StringToHGlobalAnsi( filePath ); COPYDATASTRUCT copyData; copyData.dwData = 0; copyData.cbData = (uint)System.Text.Encoding.Default.GetByteCount( filePath.ToCharArray( ) , 0 , filePath.Length ); copyData.lpData = strPtr; IntPtr ptr = Marshal.AllocHGlobal( (IntPtr)( Marshal.SizeOf( copyData ) ) ); Marshal.StructureToPtr( copyData , ptr , true ); //给主窗体发送消息，传递新文件路径 FrmMain.SendMessage( instance.MainWindowHandle , FrmMain.WM_COPYPATH , -1 , (int)ptr ); } HandleRunningInstance( instance ); //激活已运行例程 } } ///

/// 获取当前例程 ///

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; } } } return null; } ///

/// 激活已运行例程 ///

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 ); private const int WS_SHOWNORMAL = 1; } struct COPYDATASTRUCT { public uint dwData; public uint cbData; public IntPtr lpData; }

 

主窗体:

public partial class FrmMain : Form { [System.Runtime.InteropServices.DllImport( "User32.dll " )] public static extern int SendMessage( IntPtr hWnd , uint Msg , int wParam , int lParam ); public const int WM_COPYPATH = 0x004A; private string FILE_PATH; public FrmMain( string path ) { InitializeComponent( ); this.FILE_PATH = path; } protected override void WndProc( ref Message m ) { switch ( m.Msg ) { case WM_COPYPATH: COPYDATASTRUCT copyData = (COPYDATASTRUCT)Marshal.PtrToStructure( (IntPtr)m.LParam , typeof( COPYDATASTRUCT ) ); string path = string.Empty; //接收从入口处传过来的新文件路径 if ( copyData.lpData != IntPtr.Zero ) { path = Marshal.PtrToStringAnsi( copyData.lpData , (int)copyData.cbData ); } // 在这里进行界面数据的刷新 // this.FILE_PATH = path; break; } base.WndProc( ref m ); } }