Qt5 in VS2012 Getting Started code gives me undefined class errors

[kvanberendonck]

I built Qt5 and added the .lib files and header files from qtbase/include and qtbase/lib into my project in VS2012 Update 1. I'm not using the Qt plugin for now, but that shouldn't matter.

The code I'm using is this:
@#include <QtGui>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget window;
window.resize(320, 240);
window.show();
window.setWindowTitle(
QApplication::translate("toplevel", "Top-level widget"));
return app.exec();
}@
QtGui is included fine. All the classes show up w/ intellisense.

@The errors I get, however, look like this:
1>------ Build started: Project: QtTest, Configuration: Debug Win32 ------
1> Main.cpp
1>c:\users\kyle\documents\visual studio 2012\projects\qttest\qttest\main.cpp(5): error C2079: 'app' uses undefined class 'QApplication'
1>c:\users\kyle\documents\visual studio 2012\projects\qttest\qttest\main.cpp(5): error C2078: too many initializers
1>c:\users\kyle\documents\visual studio 2012\projects\qttest\qttest\main.cpp(5): error C2440: 'initializing' : cannot convert from 'char *[]' to 'int'
1> There is no context in which this conversion is possible
1>c:\users\kyle\documents\visual studio 2012\projects\qttest\qttest\main.cpp(6): error C2079: 'window' uses undefined class 'QWidget'
... more@

Any ideas?

[JKSH]

-Have you added `#include <QApplication>'?-

Edit: Sorry, didn't read properly... my bad. No ideas, sorry

[rubikon]

Same Problem here :-(

[kvanberendonck]

Yeah, still looking for a solution :|

[apbyte]

Same problem with VS2010 :/ AND NO ANSWERS

[steno]

This makes sense, QApplication isn't in QtGui.

[quote author="JKSH" date="1356500304"]-Have you added `#include <QApplication>'?-

Edit: Sorry, didn't read properly... my bad. No ideas, sorry[/quote]

[apbyte]

I got lucky.

This helped me:
@#include <QtWidgets/QApplication>@

In .pro file added these:
@QT += core gui widgets@

This still did not worked, so next was to delete everything else except my main.cpp and *.pro file as well as deleting previously compiled output directory. After deleting everything my next build worked :-)