Qt single instance process

	// qt.single.instance.cpp
	//
	// code from http://blog.naver.com/PostView.nhn?blogId=browniz1004&logNo=220957590867&categoryNo=15&parentCategoryNo=0&viewDate=&currentPage=8&postListTopCurrentPage=&from=postList&userTopListOpen=true&userTopListCount=5&userTopListManageOpen=false&userTopListCurrentPage=8
	#include "mainwindow.h"
	#include <QApplication>
	#include <QSharedMemory>
	int main(int argc, char *argv[])
	{
	QApplication a(argc, argv);
	MainWindow w;
	QSharedMemory shared("HelloWorld");
	if(!shared.create(512,QSharedMemory::ReadWrite))
	{
	QMessageBox::information(&w,QObject::tr("HelloWorld"),QObject::tr("It's already running"),QMessageBox::Ok);
	exit(0);
	}
	w.show();
	return a.exec();
	}

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