Hello everyone.
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 i am having lots 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 processes
void 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 doesnt help!
model->setStringList(LatestProcessList);
ui->listView->setModel(model);
}
//This is where we create a white-list out of our latest running process list
void 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 processes
QList<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");
}
}
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