ambiguous connect()

[Cruz]

Hello,

I don't quite know how to deal with this compiler error. I have a class that is a QWidget and a QThread at the same time. I'm using the thread to load a large file in the background. The progress bar on the widget should indicate how far the file is loaded. Here is the code:

Visualizer3D::Visualizer3D(QWidget *parent)
    : QWidget(parent), QThread(parent)
{
	ui.setupUi(this);
 
	connect(this, SIGNAL(fileLoadingProgress(int)), ui.progressBar, SLOT(valueChanged(int)));  // <-- this fails
 
	start();
}
 
void Visualizer3D::run()
{
	QFile file("data.dat");
	file.open(QIODevice::ReadOnly);
	QDataStream in(&file);
	for (unsigned int i = 0; i < LINECOUNT; i++)
	{
		emit fileLoadingProgress((int)(100*i/LINECOUNT));
	}
	file.close();
}

Visualizer3D::Visualizer3D(QWidget *parent)
    : QWidget(parent), QThread(parent)
{
	ui.setupUi(this);

	connect(this, SIGNAL(fileLoadingProgress(int)), ui.progressBar, SLOT(valueChanged(int)));  // <-- this fails

	start();
}

void Visualizer3D::run()
{
	QFile file("data.dat");
	file.open(QIODevice::ReadOnly);
	QDataStream in(&file);
	for (unsigned int i = 0; i < LINECOUNT; i++)
	{
		emit fileLoadingProgress((int)(100*i/LINECOUNT));
	}
	file.close();
}

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And then it tells me:

visualizer3d.cpp:22: error: reference to ‘connect’ is ambiguous
../../qtsdk-2009.03/qt/include/QtCore/qobject.h:307: error: candidates are: bool QObject::connect(const QObject*, const char*, const char*, Qt::ConnectionType) const
../../qtsdk-2009.03/qt/include/QtCore/qobject.h:202: error: candidates are: static bool QObject::connect(const QObject*, const char*, const QObject*, const char*, Qt::ConnectionType)
../../qtsdk-2009.03/qt/include/QtCore/qobject.h:307: error: bool QObject::connect(const QObject*, const char*, const char*, Qt::ConnectionType) const
../../qtsdk-2009.03/qt/include/QtCore/qobject.h:202: error: static bool QObject::connect(const QObject*, const char*, const QObject*, const char*, Qt::ConnectionType)

Please help?

Cruz

[Kumosan]

QWidget inherits QObject and QThread inherits QObject so which QObject should the poor connect use? You cannot multiple inherit from more than one QObject class.

[kwisp]

Are you sure that you can write that:
QWidget(parent), QThread(parent) ???
There are 2 QObject object in this class.
I think its wrong.