No appropriate default constructor available

[yczo]

Hello everybody, I'm trying to prove a program from a book for Threads test. I have not idea why the compiler show this error.
The program, must show two buttons for start and stop two wires.

Any help is appreciated greetings and thanks in advance
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/* main.cpp */
//#include "mainwindow.h"
#include <QApplication>
#include "diaHilo.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
  //  MainWindow w;
 //   w.show();
    diaHilo h;

    return a.exec();
}

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/* diaHilo.h */
#include "hilo.h"

class diaHilo : public QDialog{
    Q_OBJECT

public:
    diaHilo::diaHilo(QWidget *parent);
    ~diaHilo();

protected:
    void eCerrar(QCloseEvent *evento);

private slots:
    void iniDet_hA();
    void iniDet_hB();
private:
    hilo hA, hB;
    QPushButton *p_bhA, *p_bhB, *p_bQuitar;

};


#endif // diaHilo_H

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/*diaHilo.cpp*/
#include "diaHilo.h"

diaHilo::diaHilo(QWidget *parent) : QDialog(parent)
{
    hA.ponMsg("A");
    hB.ponMsg("B");
    p_bhA = new QPushButton(tr("Iniciar A"));
    p_bhB = new QPushButton(tr("Iniciar B"));
    p_bQuitar = new QPushButton(tr("Quitar"));
    p_bQuitar->setDefault(true);
    connect(p_bhB, SIGNAL(clicked()),this,SLOT iniDet_hB());
    connect(p_bhA, SIGNAL(clicked()),this,SLOT iniDet_hB());

}
//*************************************************
diaHilo::~diaHilo() //Destructor
{

}

//*************************************************
void diaHilo::iniDet_hA(){
    if(hA.isRunning()){
        hA.detener();
        p_bhA->setText(tr("Iniciar A"));
    }
        else{
            hA.start();
            p_bhA->setText(tr("Detener A"));
    }
}
//*************************************************
void diaHilo::iniDet_hB(){
    if(hB.isRunning()){
        hB.detener();
        p_bhB->setText(tr("Iniciar B"));
    }
        else{
            hB.start();
            p_bhB->setText(tr("Detener B"));
    }
}
//*************************************************
void eCerrar(QCloseEvent *evento){
    hA.detener();
    hB.detener();
    hA.wait();
    hB.Wait();
    evento->accept();
}

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/*hilo.h*/
#ifndef HILO_H
#define HILO_H
#include <QThread>

class hilo : public QThread
{
    Q_OBJECT
    volatile bool detenido;

    QString msgStr;

public:
    hilo();
    ~hilo();
    void ponMsg(QString &msg);
    void detener();

protected:
    void run();
};

#endif // HILO_H

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/*hilo.cpp*/
#include "hilo.h"
#include <iostream>


using namespace std;
hilo::hilo()
{
    detenido = false;
}
//********************************************

hilo::~hilo(){

}
//********************************************
void hilo::run(){
  //  QString cadena = "prueba";
  // while (!detenido) cerr << qPrintable(mensajeStr);
    detenido = false;
    cerr << endl;
}
//*********************************************
void hilo::detener(){
    detenido = true;
}
//*********************************************
void hilo::ponMsg(QString &msg){

   // QString cadena = "prueba";
  //  qDebug() << msg << endl; //funciona igual incluyendo #include<QtDebug>
    cerr << qPrintable(msg);
}
//*********************************************

[mrjj]

hi
diaHilo h;
here u use default constructor
but you only defined it with
diaHilo::diaHilo(QWidget *parent);

so
diaHilo h(NULL);

or with default value
diaHilo::diaHilo(QWidget *parent=NULL);

In non compiler language it says
"Hey You create diaHilo with no parent/parameters and such constructor i dont have."

[yczo]

Thank you very much