Free memory - QPixmap::grabWindow?

I use this code in order to capture the color of a pixel, compare it with a HTML value and do an action if the comparisono is successful

Code:

---

while(1){
        sleep(3000);
        QPixmap *a = new QPixmap;
        *a = QPixmap::grabWindow(QApplication::desktop()->winId());
        QImage *img = new QImage;
        *img = a->toImage();
        QRgb b = img->pixel(796,554);
        QColor *c = new QColor;
        c->setRgb(b);
        qDebug() << c->name();
        delete a;
        delete c;
        if(c->name() == "#968d82"){
            system("canberra-gtk-play -f ~/Documents/Alert.wav");
        }

---

Every time it goes through the loop the program takes almost 4MB of memory usage :rolleyes::confused::rolleyes:
It's probaly because it grubs the whole desktop picture every time it runs...
I tried to free some by deleting 'a' and 'c' but it didn't work. Any suggestion?

Why do you use heap allocation in this case?
You are using all variables only locally - so get rid of the heap allocation and use stack variables.
See if this helps.

Code:

---

delete c;
        if(c->name() == "#968d82"){

---

This is not good, you delete an object and then reference it, you were very lucky it didn't crash. Memory is leaking, because you don't have delete img; anywhere.
Anyway, high_flyer is right, there is no need for heap allocation.

Thx, deleting the img did the trick ;)