WMS_DLRK/Common/SiaSun.LMS.Common/SingleInstance.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;

namespace SiaSun.LMS.Common
{
    /// <summary>
    /// Ӧ�ó���Ψһ����ʵ��ʵ��
    /// ����ǰϵͳֻ�ܴ���һ��SiasunLMS����ʵ��
    /// </summary>
    public static class SingleInstance
    {
        /// <summary>
        /// �����������еij���ʵ���߳�
        /// </summary>
        public static Process GetRunningInstance()
        {
            Process currentProcess = Process.GetCurrentProcess(); //��ȡ��ǰ���� 
            //��ȡ��ǰ���г�����ȫ�޶��� 
            string currentFileName = currentProcess.MainModule.FileName;
            //��ȡ������ΪProcessName��Process���顣 
            Process[] processes = Process.GetProcessesByName(currentProcess.ProcessName);
            //��������ͬ���������������еĽ��� 
            foreach (Process process in processes)
            {
                if (process.MainModule.FileName == currentFileName)
                {
                    if (process.Id != currentProcess.Id) //���ݽ���ID�ų���ǰ���� 
                        return process;//���������еĽ���ʵ�� 
                }
            }
            return null;
        }
 
        //��������������WinAPI���书�ܽ��ڰ�װ������������ 
        [DllImport("User32.dll")] 
        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow); 
        [DllImport("User32.dll")] 
        private static extern bool SetForegroundWindow(IntPtr hWnd); 

        //��������Ա��������
        private const int WS_SHOWNORMAL = 1;

        /// <summary>
        /// ������һ����װ��HandleRunningInstance��̬����Ϊ��ȡӦ�ó�������������Ӧ�ó���Ϊǰ̨���У�������boolֵ�� 
        /// </summary>
        /// <param name="instance">����ʵ��</param>
        public static bool HandleRunningInstance(Process instance)
        {
            //ȷ������û�б���С���������� 
            ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL);
            //����Ϊforeground window 
            return SetForegroundWindow(instance.MainWindowHandle);
        }

        /// <summary>
        /// �ж��Ƿ�ʵ���Ƿ�����
        /// </summary>
        public static bool HandleRunningInstance()
        {
            Process p = GetRunningInstance();
            if (p != null)
            {
                HandleRunningInstance(p);
                return true;
            }
            return false;
        }
    }
}