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Uniq : single instance applications made easy [message #31118]

Sun, 06 February 2011 00:27

mdelfede
Messages: 1308
Registered: September 2007

Ultimate Contributor

I started Uniq class, by now working just for Linux,windows part in development. It allows to have a single application instance running and other instances passing their command line to it.
Example code :

UniqTest.lay :

LAYOUT(UniqTestLayout, 404, 240)
	ITEM(LineEdit, edit, SetEditable(false).WantFocus(false).LeftPosZ(8, 388).TopPosZ(8, 220))
END_LAYOUT

UniqTest.h :

#ifndef _UniqTest_UniqTest_h
#define _UniqTest_UniqTest_h

#include <CtrlLib/CtrlLib.h>

#include <Uniq/Uniq.h>

using namespace Upp;

#define LAYOUTFILE <UniqTest/UniqTest.lay>
#include <CtrlCore/lay.h>

class UniqTest : public WithUniqTestLayout<TopWindow>
{
	private:
	public:
		typedef UniqTest CLASSNAME;
		UniqTest();

		// handles news app instances
		void handleInstance(Vector<String> const &v);
		
};

UniqTest.cpp :

#include "UniqTest.h"

UniqTest::UniqTest()
{
	CtrlLayout(*this, "Window title");
}

// handles news app instances
void UniqTest::handleInstance(Vector<String> const &v)
{
	String s = edit.Get() + "NEW INSTANCE LAUNCHED\n  Command line : '";
	for(int i = 0; i < v.GetCount(); i++)
		s += v[i] + ",";
	if(s[s.GetCount() - 1] == ',')
		s = s.Left(s.GetCount()-1);
	s += "\n";
	
	edit <<= s;
	ProcessEvents();
}

GUI_APP_MAIN
{
	// create Uniq object
	Uniq uniq;
	
	// if not inside first instance, send commandline
	// to first instance and leave
	if(!uniq)
		return;
	
	UniqTest uniqTest;

	// setup callback handling other app's instances
	uniq.WhenInstance = callback(&uniqTest, &UniqTest::handleInstance);
		
	uniqTest.Run();
}

This code allows first app instance to start. If you start other instances, their Command Line is routed to it with a posted callback, allowing opened instance, for example, to open a file.
In this small example, it just echoes command line of newly started apps.

Ciao

Max

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