[SOLVED] QWebView, forward declaration, "error: forward declaration of 'struct QWebView'"

Squall90 · 12-28-2010, 04:38 AM

Hi there,

I am trying to include a QWebView widget in my application. Every time I try to compile it, I just get these errors:

Code:

$ LANG=en_US make
g++ -c -pipe -O2 -march=i486 -mtune=i686 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_WEBKIT_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/lib/qt/mkspecs/linux-g++ -I. -I/usr/lib/qt/include/QtCore -I/usr/lib/qt/include/QtNetwork -I/usr/lib/qt/include/QtGui -I/usr/lib/qt/include/QtWebKit -I/usr/lib/qt/include -I. -I. -o main.o main.cpp
main.cpp: In constructor 'WebView::WebView()':
main.cpp:14: error: invalid use of incomplete type 'struct QWebView'
main.cpp:3: error: forward declaration of 'struct QWebView'
main.cpp:15: error: invalid use of incomplete type 'struct QWebView'
main.cpp:3: error: forward declaration of 'struct QWebView'
main.cpp: In function 'int main(int, char**)':
main.cpp:23: error: invalid use of incomplete type 'struct QWebView'
main.cpp:3: error: forward declaration of 'struct QWebView'
main.cpp:24: error: 'class WebView' has no member named 'exec'
make: *** [main.o] Error 1

qwebview.pro

Code:

TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .

QT += gui core webkit network

# Input
SOURCES += main.cpp

main.cpp

Code:

#include <QtGui>

class QWebView;

class WebView : public QMainWindow
{
	Q_OBJECT

public:
	QWebView *view;

	WebView() 
	{
		view = new QWebView(this);
		view->load(QUrl("http://www.google.com"));
	}
};

int main(int argc, char **argv)
{
	QApplication app(argc, argv);
	WebView *view = new WebView;
	view->view->show();
	return view->exec();
}

I know, it has something to do that I forward declare the QWebView class but all examples are written this way, so way shouldn't I do it this way?
http://doc.qt.nokia.com/4.6/webkit-fancybrowser.html

How to solve this problem?

Thanks

Squall90 · 12-28-2010, 05:40 AM

_________________________

I got the solution myself... Every time I have problems that seem to be unsolveable I post on web forums and a short time after posting, I find the solution myself... This sucks~

However, I saw a difference in the Nokia/Qt example. It only forward declare the QWebView class in the header file and it includes QWebKit in the main.cpp file.
Another problem (only in my test program is, that I cannot make the class "Q_OBJECT" without and additional header file.

Thanks anyway.

damn... I clicked on the edit button but entered the text in the "Quick Reply box". Sorry ...