第一种写法
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;
}
}
}
}
第二种写法
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;
}
}