Problem using signals and thread

[aarelovich]

Hello, I have the following problem:
I have to execute a long algorithm when a user pushes a button. So I created a new class that is a subclass from QThread and use the button push to start said thread. But I also want to have some sort of measure of the progress and for that I wanted to create a signal and a slot. So I made a little test program. However when I used connect, to connect my slot and signal I get a console message (I'm compiling in debug mode):

Object::connect: No such signal QThread:: p(int)
Object::connect: (receiver name: 'ConnectTryClass')

Where p is the name of my signal in my QThread subclass.

Here is the code for the Sender class (.cpp) (QThread decendant):

#include "Sender.h"
 
Sender::Sender()
{
}
 
void Sender::run(){
	int N = 10000000;
	int a;
	for (int i = 0; i < N; i++){
		a++;
		double val = (double)(i+1)*100/double(N);
		emit p((int)(val));
	}
}
 
void Sender::p(int val){
}
 
Sender::~Sender()
{
}

#include "Sender.h"

Sender::Sender()
{
}

void Sender::run(){
	int N = 10000000;
	int a;
	for (int i = 0; i < N; i++){
		a++;
		double val = (double)(i+1)*100/double(N);
		emit p((int)(val));
	}
}

void Sender::p(int val){
}

Sender::~Sender()
{
}

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and its header:

class Sender: public QThread
{
public:
	Sender();
	void run();
	~Sender();
 
signals:
	void p(int val);
 
};

class Sender: public QThread
{
public:
	Sender();
	void run();
	~Sender();

signals:
	void p(int val);
	
};

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And where I call the connec (ConnectTry.cpp)t:

#include "connecttry.h"
 
ConnectTry::ConnectTry(QWidget *parent): QMainWindow(parent)
{
	ui.setupUi(this);
	sender = new Sender();
	bool res = connect(sender,SIGNAL(p(int)),this,SLOT(on_p(int)));
	if (res)
		ui.teLog->append("Yes");
	else{
		ui.teLog->append("No");
	}
}
 
void ConnectTry::on_p(int val){
	ui.pbDone->setValue(val);
}
 
void ConnectTry::on_pbTest_clicked(){
	sender->start(QThread::InheritPriority);
	ui.teLog->append("Done");
}

#include "connecttry.h"

ConnectTry::ConnectTry(QWidget *parent): QMainWindow(parent)
{
	ui.setupUi(this);
	sender = new Sender();
	bool res = connect(sender,SIGNAL(p(int)),this,SLOT(on_p(int)));
	if (res)
		ui.teLog->append("Yes");
	else{
		ui.teLog->append("No");
	}
}

void ConnectTry::on_p(int val){
	ui.pbDone->setValue(val);
}

void ConnectTry::on_pbTest_clicked(){
	sender->start(QThread::InheritPriority);
	ui.teLog->append("Done");
}

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Can any one tell me what I'm doing wrong?
Thank you

[jacek]

You forgot the Q_OBJECT macro.

[aarelovich]

Thank you very much that effectively solved my problem