Qt memory management. What's wrong?

Question

I have a question about memory leak in Qt.

I have a QMainWindow with 2 QPushButtons.

First beep of a button:

m_label = new QLabel(this);

QPixmap pix(this->size());
QPainter painter;
painter.begin(&pix);

QImage img("1.png");
painter.drawPixmap(this->rect(), QPixmap::fromImage(img));
m_label->setPixmap(pix);

painter.end();

Signal for pressing the Secont button:

delete m_label;

When I run the test application, the allocated memory is about 11900 Kb. When I click on the first button, then the allocated memory for the application is about 12450 Kb. When I click on the second button, I got the allocated memory about 12250 Kb.

Why didn’t I get the same 11900 Kb? Is this a leak?

So, if you write the following code:

QImage img("1.png");
QImage img1("1.png");
QImage img2("1.png");
QImage img3("1.png");
QImage img4("1.png");
QImage img5("1.png");
QImage img6("1.png");
QImage img7("1.png");
QImage img8("1.png");
QImage img9("1.png");

Then, the allocated memory grows, but does not decrease. What for? How to clear this memory leak?

Answer 1

• QImage img ( "1.png" ) Qt ( ). , - , .
• QImages (img... img9 case)? , ?
• , .