using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Reflection;
namespace OnlyProcess
{
static class Program
{
[STAThread]
static void Main()
{
MessageBox.Show("ddddd");
Process instance = RunningInstance();
if (instance == null)
{
System.Windows.Forms.Application.EnableVisualStyles(); //这两行可以让窗体具有XP风格.
System.Windows.Forms.Application.DoEvents();
Application.Run(new Form1());
}
else
{
HandleRunningInstance(instance);
}
}
#region 只运行一个实例
public static Process RunningInstance()
{
Process current = Process.GetCurrentProcess();//当前新启动的线程
Process[] processes = Process.GetProcessesByName(current.ProcessName);
//遍历与当前进程名称相同的进程列表
foreach (Process process in processes)
{
//process,原来旧的线程与当前新启动的线程ID不一样
//Ignore the current process
if (process.Id != current.Id)
{
//Make sure that the process is running from the exe file.
if (Assembly.GetExecutingAssembly().Location.Replace("/", "//") == current.MainModule.FileName)
{
//Return the other process instance.
return process;//返回原来旧线程的窗体
}
}
}
return null;
}
private static void HandleRunningInstance(Process instance)
{
MessageBox.Show("该应用系统已经在运行!", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL); //调用api函数,正常显示窗口
SetForegroundWindow(instance.MainWindowHandle); //将窗口放置最前端。
}
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(System.IntPtr hWnd, int cmdShow);
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(System.IntPtr hWnd);
private const int WS_SHOWNORMAL = 1;
#endregion
}
}
//namespace OnlyProcess
//{
// static class Program
// {
// /// <summary>
// /// 应用程序的主入口点。
// /// </summary>
// [STAThread]
// static void Main()
// {
// //get the name of our process
// string proc = Process.GetCurrentProcess().ProcessName;
// //get the list of all processes by that name
// Process[] processes = Process.GetProcessesByName(proc);
// //if there is more than one process
// if (processes.Length > 1)
// {
// DialogResult dr = MessageBox.Show("Application is already running! Are you sure want to run another?", "INFORMATION", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
// if (dr == DialogResult.OK)
// {
// Application.EnableVisualStyles();
// Application.SetCompatibleTextRenderingDefault(false);
// Application.Run(new Form1());
// }
// }
// else
// {
// Application.EnableVisualStyles();
// Application.SetCompatibleTextRenderingDefault(false);
// Application.Run(new Form1());
// }
// }
// }
//}