Qt create and QLabel, why is there an error?

I'm using Qt creator 2.0.1, and when entering this line:

#include <QLabel>

I get the following error:

QLabel: No such file or directory

Why is that? And, how can I include a label in this case?

UPDATE

@maverik showed me how to solve the QLabel error, but I'm now getting this error:

The program I'm trying to run is:

#includ开发者_运维问答e <QtCore/QCoreApplication>
#include <QtGui/QLabel>

int main(int argc, char *argv[]) {
QCoreApplication myapp(argc, argv);
QLabel *label = new QLabel("Hello");
label->show();
return myapp.exec(); 
}

Any ideas?

Thanks.

Use

QApplication

Rather than

QCoreApplication

.

from the QCoreApplication docs:

The QCoreApplication class provides an event loop for console Qt applications. This class is used by non-GUI applications to provide their event loop. For non-GUI application that uses Qt, there should be exactly one QCoreApplication object. For GUI applications, see QApplication.

Then Include the relevant headers, and it will compile just fine. QCoreApplication is for non-Gui applications (Console).

Check that your Qt project -file contains

QT += gui
CONFIG += qt

and does not contain

QT -= gui

I think this causes the linking problem. Also I think

#include <QLabel>

... should be enough if project file is correct.

Try this:

#include <QtGui/QLabel>

I think I found where the issue is.

Since I'm using Qt Creator, and when creating a new project, I was choosing Qt Console Application instead of Qt Gui Application.

QLabel Class The QLabel widget provides a text or image display. More...

Header: #include qmake: QT += widgets Inherits: QFrame List of all members, including inherited members Obsolete members

*** Simply add QT += widgets to the .pro