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The connect call in the MainWindow constructor:
connect(timer, QTimer::timeout, this, MainWindow::update);
fails to compile with:
call to non-static member function without an object argument

I can only make it work using the old syntax:
connect(timer, SIGNAL(timeout()), this, SLOT(update()));

on trying the example over windows, mainWindow.cpp throws this issue

// Update buttons style
ui->button1->style()->polish(ui->button1);

error: invalid use of incomplete type 'class QStyle'

PD: using Qt Creator 5.0.2 Based on Qt 5.15.2 (MSVC 2019, 64 bit)

When running the "Setup OpenGL" project, the triangle doesn't appear on the centre of the window as shown in the book. I'm using MacOS with the latest version of Qt installed. Any help would be appreciated!

Chapter02/Signals_Slots fails to compile with the error:
no matching function for call to 'information'
QMessageBox::information(this, "Hello", "Button has been clicked!");
^~~~~~~~~~~~~~~~~~~~~~~~

I believe the reason for this is the fact that MyClass (the this pointer in the above error) inherits from QObject but the information method expects a QWidget, hence the error.

Running the Chapter01/Styling_in_QML code presents the login interface as expected, but it doesn't let the user actually input any characters in the username (textInput1) and password (textInput2) fields.

I got this error when i tried the sample code in QT6.5

After some time I found that some libraries needed to be added in the 'mainWindow.h' file

The completed list was this

Just thought others may need to know if they got the same error

The image of the tux is not shown on the window. I tried giving the full path of the image, but that didn't work either.