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Start 2nd instance of a c# program with a parameter, which the 1st instance of the program uses

I have a single instance program, which when it runs I can choose to pass a single parameter to it.

If the program runs with no parameters, just opens up on a tab a dataGridView and loads a list of customers into it. If I double click a row it opens up that particular customer in a 2nd tab with more info on it.

If I start the program with a parameter, (a customer id number from 00000 to 99999) it automatically switches to the 2nd tab and loads that individual customers data.

So far so good, however, What I want to be able to do is have my program running, but if a 2nd instance of the program is called with a parameter, e.g. Program.exe 1234, I want it to just jump straight to the 2nd tab and display that customer's details.

This is what I have so far. Am I barking up the wrong tree with the way I'm trying to do this? I get the impression the Program.exe should be listening for another instance running and using the parameter passed to it.

Any advice would be greatly appreciated.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Text;
using System.Diagnostics;
using System.Threading;
using System.Reflection;
using System.IO;

namespace SiteConnex { public class SingleApplication { /// Imports [DllImport("user32.dll")] private static extern int ShowWindow(IntPtr hWnd, int nCmdShow); [DllImport("user32.dll")] private static extern int SetForegroundWindow(IntPtr hWnd); [DllImport("user32.dll")] private static extern int IsIconic(IntPtr hWnd); public static bool secondInstance = false; public static string siteid = ""; public static bool gotosite = false;

    public static void Main(string[] args)
    {
        // string siteid = "";
        // bool gotosite = false;
        // bool secondInstance = false;
        int testSiteid = 0;
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);

        try
        {
            siteid = Convert.ToString(args[0]);
        }
        catch (Exception noArgs)
        {
            // No commandline args have been passed.
        }

// check that the parameter passed is actually a valid number, otherwise just act like no params passed. try { testSiteid = Convert.ToInt32(siteid); if ((testSiteid > 00000) || (testSiteid < 99999)) { gotosite = true; } else { siteid = ""; } } catch (Exception e) { // If you get an exception it means siteid had duff data passed into it. }

/// Check if it's running, if it is, pass siteid and gotosite through... and acts as if it has a valid siteid passed to it. // Application.Run(new Form1(siteid, gotosite)); Run(siteid, gotosite, secondInstance); } private static IntPtr GetCurrentInstanceWindowHandle() { IntPtr hWnd = IntPtr.Zero; Process process = Process.GetCurrentProcess(); Process[] processes = Process.GetProcessesByName(process.ProcessName); foreach(Process _process in processes) { // Get the first instance that is not this instance, has the // same process name and was started from the same file name // and location. Also check that the process has a valid // window handle in this session to filter out other user's // processes. if (_process.Id != process.Id && _process.MainModule.FileName == process.MainModule.FileName && _process.MainWindowHandle != IntPtr.Zero) { hWnd = _process.MainWindowHandle; break; } } return hWnd; } /// SwitchToCurrentInstance private static void SwitchToCurrentInstance(string siteid, bool gotosite, bool secondInstance) { IntPtr hWnd = GetCurrentInstanceWindowHandle(); if (hWnd != IntPtr.Zero) { // Restore window if minimised. Do not restore if already in // normal or maximised window state, since we don't want to // change the current state of the window. if (IsIconic(hWnd) != 0) { ShowWindow(hWnd, SW_RESTORE); } // Set foreground window. SetForegroundWindow(hWnd); secondInstance = true; } } /// Execute a form base application if another instance already running on /// the system activate previous one /// <param name="frmMain">main form</param> /// true if no previous instance is running // public static bool Run(System.Windows.Forms.Form frmMain) public static bool Run(string siteid, bool gotosite, bool secondInstance) { if(IsAlreadyRunning()) { 开发者_C百科 //set focus on previously running app SwitchToCurrentInstance(siteid, gotosite, secondInstance); return false; } Application.Run(new Form1(siteid, gotosite, secondInstance)); return true; } /// check if given exe alread running or not /// returns true if already running private static bool IsAlreadyRunning() { string strLoc = Assembly.GetExecutingAssembly().Location; FileSystemInfo fileInfo = new FileInfo(strLoc); string sExeName = fileInfo.Name; bool bCreatedNew; mutex = new Mutex(true, "Global\\"+sExeName, out bCreatedNew); if (bCreatedNew) mutex.ReleaseMutex(); return !bCreatedNew; } static Mutex mutex; const int SW_RESTORE = 9; }

}


Ah ha... found the answer in this... Someone called MadHatter made an SingleInstance app that does exactly what I was looking to do and seems fairly straight forwards.

http://sanity-free.org/misc/SingleInstanceApp.zip

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