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【CSharp】让程序只保证一个进程的类
作者:zgke / 发布于2014/7/29/ 944

	使用方法在Program.cs里的Main里调用就好了

	LoadProcess.StarPoint()第1个参数是用来给已启动的进程发送的消息..

	
	 [STAThread]
	 static void Main(string[] args)
	 {
	 Application.EnableVisualStyles();
	 Application.SetCompatibleTextRenderingDefault(false);
	 if (LoadProcess.StarPoint("哈哈", true))
	 {
	 Form2 _Form=new Form2();
	 LoadProcess.LoadProcessMessage _Load = new LoadProcess.LoadProcessMessage(_Form.Handle);
	 _Load.LoadMessage += new LoadProcess.LoadProcessMessage.GetMessage(_Load_LoadMessage);
	 Application.Run(_Form);
	 }
	 else
	 {
	
	 }
	 }
	 static void _Load_LoadMessage(string Text)
	 {
	 Application.OpenForms[0].Text = Text;
	 }

	

	下面是全部代码

	using System;
	using System.Collections.Generic;
	using System.Text;
	using System.Runtime.InteropServices;
	using System.Windows.Forms;
	using System.Diagnostics;

	namespace Zgke.SysInfo
	{
	 /// <summary>
	 /// 只能运行一个的程序
	 /// zgke@sina.com
	 /// qq:116149
	 /// </summary>
	 public class LoadProcess
	 {
	

	 /// <summary>
	 /// 检查当前进程是否已存在
	 /// </summary>
	 /// <param name="p_Message">发送进程消息</param>
	 /// <param name="p_IsPath">通过路径判断 false是通过进程名判断</param>
	 /// <returns>true不存在 false存在</returns>
	 public static bool StarPoint(string p_Message, bool p_IsPath)
	 {
	 Process _Process = Process.GetCurrentProcess();
	 Process[] _ProcessList = Process.GetProcessesByName(_Process.ProcessName);
	 int _ProcessInst = 0;
	 IntPtr _ProcessMainWindowHandle = IntPtr.Zero;
	 if (p_IsPath)
	 {
	 for (int i = 0; i != _ProcessList.Length; i++)
	 {
	 if (_ProcessList[i].MainModule.FileName == _Process.MainModule.FileName) _ProcessInst++;

	 if (_ProcessList[i].Id != _Process.Id) _ProcessMainWindowHandle = _ProcessList[i].MainWindowHandle;
	 }
	 }
	 else
	 {
	 _ProcessInst = _ProcessList.Length;
	 }
	 if (_ProcessInst == 1)
	 {
	 return true;
	 }
	 else
	 {
	 if (p_Message != null) SendMessage(p_Message, _ProcessMainWindowHandle);
	 return false;
	 }
	 }

	 /// <summary>
	 /// 发送消息
	 /// </summary>
	 /// <param name="Message">发送消息</param>
	 /// <param name="p_MainIntPtr">主窗体</param>
	 private static void SendMessage(string Message, IntPtr p_MainIntPtr)
	 {
	 byte[] _Bytes = System.Text.Encoding.Default.GetBytes(Message);
	 COPYDATASTRUCT _Data = new COPYDATASTRUCT();
	 _Data.dwData = new IntPtr(100);
	 _Data.lpData = Message;
	 _Data.cbData = _Bytes.Length + 1;
	 SendMessage(p_MainIntPtr, 0x004A, 0, ref _Data);
	 }

	 /// <summary>
	 /// 获取消息
	 /// </summary>
	 public class LoadProcessMessage : NativeWindow
	 {
	 public LoadProcessMessage(IntPtr p_MainWindowHandle)
	 {
	 base.AssignHandle(p_MainWindowHandle);
	 }
	 public delegate void GetMessage(string Text);
	 public event GetMessage LoadMessage;

	 protected override void WndProc(ref Message m)
	 {
	 if (m.Msg == 0x004A)
	 {
	 if (LoadMessage != null)
	 {
	 COPYDATASTRUCT _Data = new COPYDATASTRUCT();
	 Type _DataType = _Data.GetType();
	 _Data = (COPYDATASTRUCT)m.GetLParam(_DataType);
	 LoadMessage(_Data.lpData);
	 }

	 }
	 base.WndProc(ref m);
	 }
	 }

	 /// <summary>
	 /// 消息
	 /// </summary>
	 public struct COPYDATASTRUCT
	 {
	 /// <summary>
	 /// 句柄 (IntPtr) 100
	 /// </summary>
	 public IntPtr dwData;
	 /// <summary>
	 /// 数据大小 是byte的大小
	 /// </summary>
	 public int cbData;
	 /// <summary>
	 /// 数据
	 /// </summary>
	 [MarshalAs(UnmanagedType.LPStr)]
	 public string lpData;
	 }

	 [DllImport("user32.dll", CharSet = CharSet.Auto)]
	 public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, ref COPYDATASTRUCT copyData);

	 }
	}
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