I am trying to get the list of processes in a <1 ms intervals and then show the latest list in a listwidget or a listview.
In the listWidget there is a lot of flickering happening. I tried listview it is even worse.
This is my sample code:
#include "frmprocess.h"#include "ui_frmprocess.h"#include "qprocess.h"#include <windows.h>#include <tlhelp32.h>#include "qstring.h"#include "qtimer.h"#include "qlist.h"#include "qmessagebox.h"frmProcess::frmProcess(QWidget *parent) : QMainWindow(parent), ui(new Ui::frmProcess){ ui->setupUi(this); //setting timer timer = new QTimer(this); connect(timer,SIGNAL(timeout()),this,SLOT(OnTimerTick())); model = new QStringListModel(this);}frmProcess::~frmProcess(){ delete ui;}//in each timer tick event, we get the latest list of running processesvoid frmProcess::OnTimerTick(){ LatestProcessList.clear(); LatestProcessList.append(GetAllRunningProcesses()); if(ui->checkBox->isChecked()) { //getting new processes which are not in the white-list GetDifference(); } ui->listWidget->addItems(GetAllRunningProcesses()); //Filling model! in order to avoid flickering!-- this doesn't help! model->setStringList(LatestProcessList); ui->listView->setModel(model);}//This is where we create a white-list of our latest running process listvoid frmProcess::on_pushButton_clicked(){ // GetAllRunningProcesses(); WhiteList.clear(); ui->listWidget_2->clear(); WhiteList.append(GetAllRunningProcesses()); ui->listWidget_2->addItems(WhiteList);}//This method gets the list of all running processesQList<QString> frmProcess::GetAllRunningProcesses(){ HANDLE hSysSnapshot = NULL; PROCESSENTRY32 proc; QList<QString> list; proc.dwSize = sizeof(proc); hSysSnapshot = CreateToolhelp32Snapshot ( TH32CS_SNAPPROCESS, 0 ); Process32First(hSysSnapshot,&proc); proc.dwSize = sizeof(proc); ui->listWidget->clear(); list.clear(); do { list.append(QString::fromWCharArray(proc.szExeFile)); } while(Process32Next(hSysSnapshot,&proc)); CloseHandle( hSysSnapshot ); return list;}void frmProcess::GetDifference(){ QSet<QString> intersection = LatestProcessList.toSet().subtract(WhiteList.toSet()); ui->listWidget_3->clear(); ui->listWidget_3->addItems(intersection.toList());}void frmProcess::on_btnStartTimer_clicked(){ if(ui->btnStartTimer->text()=="Start") { timer->start(1); ui->btnStartTimer->setText("Stop"); } else { timer->stop(); ui->btnStartTimer->setText("Start"); }}