wince c# 程序只能运行一次

 
using System;

using System.Collections.Generic;
using System.Windows.Forms;
using RFIDWareHouse.View;
using System.Runtime.InteropServices;

namespace RFIDWareHouse
{
    static class Program
    {

        [DllImport("coredll.Dll")]
        private static extern int GetLastError();
        [DllImport("coredll.Dll")]
        private static extern int ReleaseMutex(IntPtr hMutex);
        [DllImport("coredll.Dll")]
        private static extern IntPtr CreateMutex(SECURITY_ATTRIBUTES lpMutexAttributes, bool bInitialOwner, string lpName);

        private const int ERROR_ALREADY_EXISTS = 0183;

        [StructLayout(LayoutKind.Sequential)]
        public class SECURITY_ATTRIBUTES { public int nLength; public int lpSecurityDescriptor; public int bInheritHandle;    }
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [MTAThread]
        static void Main()
        {
            //Application.Run(new frmLogin());
            IntPtr hMutex = CreateMutex(null, false,"Futureproduct" ); 
            if (GetLastError() != ERROR_ALREADY_EXISTS) 
            { 
                System.Windows.Forms.Application.Run(new frmLogin()); 
                return; 
            } 
            else 
            {
                MessageBox.Show("程序已经启动.");
                ReleaseMutex(hMutex);
                return;
            }
        }
    }
}

以上为第一种写法

 

以下为第二种

 

 

public class Mutex
{
[DllImport("coredll.dll", EntryPoint = "CreateMutex", SetLastError = true)]
public static extern IntPtr CreateMutex(
IntPtr lpMutexAttributes,
bool InitialOwner,
string MutexName);

[DllImport("coredll.dll", EntryPoint = "ReleaseMutex", SetLastError = true)]
public static extern bool ReleaseMutex(IntPtr hMutex);

private const int ERROR_ALREADY_EXISTS = 0183;

/// <summary>
/// 判断程序是否已经运行
/// </summary>
/// <returns>
/// true: 程序已运行，则什么都不做
/// false: 程序未运行，则启动程序
/// </returns>
public static bool IsExist()
{
string strAppName = 
System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;
IntPtr hMutex = CreateMutex(IntPtr.Zero, true, strAppName);
if (hMutex == IntPtr.Zero)
throw new ApplicationException("Failure creating mutex: "
+ Marshal.GetLastWin32Error().ToString("X"));

if (Marshal.GetLastWin32Error() == ERROR_ALREADY_EXISTS)
{
ReleaseMutex(hMutex);
return true;
}
return false;
}
}