Run a timer based slot concurrently

BigBen

Hi,
I have a slot called map_transfer(int init_map, float arr). I want to run this slot every 2 seconds and therefore, I have connected it to a timer. However, when I run this function, my entire GUI gets slowed down and gets stuck sometimes.
The UI gets stuck because this function saves an image locally whenever it is called.

Therefore, I want to run this slot concurrently, so that the GUI doesn't get stuck.

How can I do so?

sierdzio

You have many options:

have a QThread waiting for the job and trigger it's slot every 2 seconds using your timer
use QtConcurrent
use QtPromise

BigBen

@sierdzio
Thanks for your reply. I want to use QtConcurrent. But unable to understand how to make it work for my situation.

I have the following:

 mytimer = new QTimer(this);
 connect(mytimer, SIGNAL(timeout()), this, SLOT(update_info()));
 timer->start(2000);

The update_info() slot has the function map_transfer(int init_map, float arr) (the time consuming function):

void MainWindow::update_info()
{
    QString str = this->mypath;
    QByteArray backTrack = str.toLocal8Bit();
    char* mySpace = backTrack.data();

    int success =map_transfer(init_map, arr); //time consuming function to be run concurrently

    int myRet = transfer_to_file(str, arr);
}

the transfer_to_file function has to run after the map_transfer function has completed its run.

J.Hilk

@BigBen
https://github.com/DeiVadder/QtThreadExample

and direct link to the concurrent subproject:
https://github.com/DeiVadder/QtThreadExample/tree/master/projects/QtConcurrent