[SOLVED] Problem to implement a QThread

guidupas

Hello!

I am having a problem to implement a QThread. My application crash when the thread is started - processo->start()

Help me please. Thanks a lot.

defConexao::defConexao(QWidget *parent) :
QDialog(parent),
ui(new Ui::defConexao)
{
ui->setupUi(this);

verticalLayout_3 = new QVBoxLayout;
limparLayout = new limpaLayout;
this->ui->verticalLayout->addLayout(verticalLayout_3);

}

defConexao::~defConexao()
{
delete ui;
}

void defConexao::on_cancelarButton_clicked()
{
this->close();
}

void defConexao::on_tipoConexaoComboBox_currentIndexChanged(int index)
{
if(index == 0)
{
limparLayout->limpaWidgetLayout(this->verticalLayout_3, false);
ui->okButton->setEnabled(false);
}
else
{
if(index == 3)
{
limparLayout->limpaWidgetLayout(this->verticalLayout_3, false);

                horizontalLayout_2 = new QHBoxLayout;

                verticalLayout_4 = new QVBoxLayout;
                verticalLayout_5 = new QVBoxLayout;

                enderecodBdLabel = new QLabel("IP ou HOST do banco de dados");
                enderecoBdLineEdit = new QLineEdit();

                portaBdLabel = new QLabel("Porta");
                portaBdLineEdit = new QLineEdit();
                portaBdLineEdit->setText("5432");
                portaBdLineEdit->setMaximumWidth(70);
                portaBdLineEdit->setValidator(new QIntValidator(this));

                this->verticalLayout_4->addWidget(enderecodBdLabel);
                this->verticalLayout_4->addWidget(enderecoBdLineEdit);

                this->verticalLayout_5->addWidget(portaBdLabel);
                this->verticalLayout_5->addWidget(portaBdLineEdit);

                this->horizontalLayout_2->addLayout(verticalLayout_4);
                this->horizontalLayout_2->addLayout(verticalLayout_5);

                this->verticalLayout_3->addLayout(horizontalLayout_2);

                barraProgresso = new QProgressBar;
                this->verticalLayout_3->addWidget(barraProgresso);

                ui->okButton->setEnabled(true);
            }
}

}

void defConexao::on_okButton_clicked()
{
bool camposCompletos = true;
if(ui->tipoConexaoComboBox->currentIndex() == 3)
{
if(this->enderecoBdLineEdit->text() == "")
{
camposCompletos = false;
this->enderecoBdLineEdit->setStyleSheet("border: 1px solid red");
}
else
{
this->enderecoBdLineEdit->setStyleSheet("");
}

            if(this->portaBdLineEdit->text() == "")
            {
                camposCompletos = false;
                this->portaBdLineEdit->setStyleSheet("border: 1px solid red");
            }
            else
            {
                this->portaBdLineEdit->setStyleSheet("");
            }

            if(camposCompletos == true)
            {
                QThread processo;
                criaConfServidor *criaConf = new criaConfServidor;
                criaConf->connectaThreadComSlot(processo);
                criaConf->moveToThread(&processo);
                processo.start();
            }
        }

}
@
@
//defconexao.h

namespace Ui {
class defConexao;
}
class defConexao : public QDialog
{
Q_OBJECT

public:
explicit defConexao(QWidget *parent = 0);
~defConexao();

bool verificaArquivoExiste();

private slots:
void on_cancelarButton_clicked();
void on_tipoConexaoComboBox_currentIndexChanged(int index);
void on_selecionaArquivoButton_clicked();
void on_okButton_clicked();

private:
Ui::defConexao *ui;

QLabel *codigoIdBdLabel;
QLineEdit *codigoIdBdLineEdit;

QLabel *enderecodBdLabel;
QLineEdit *enderecoBdLineEdit;
QLabel *portaBdLabel;
QLineEdit *portaBdLineEdit;

QLabel *avisoConfigExisteLabel;
QLineEdit *caminhoArquivoLineEdit;
QPushButton *selecionaArquivoButton;

QVBoxLayout *verticalLayout_3;
QVBoxLayout *verticalLayout_4;
QVBoxLayout *verticalLayout_5;
QHBoxLayout *horizontalLayout_2;

QProgressBar *barraProgresso;

limpaLayout *limparLayout;

caixaDialogos *caixaDeDialogos;

};

#endif // DEFCONEXAO_H
@
@
//criaconfservidor.cpp

criaConfServidor::criaConfServidor(QObject *parent) :
QObject(parent)
{
}

void criaConfServidor::connectaThreadComSlot(QThread &processo)
{
qDebug() << "Conexão efetuada";
connect(&processo, SIGNAL(started()), this, SLOT(criaArquivoConf()));
}

void criaConfServidor::criaArquivoConf()
{
qDebug() << "Entrou";
}
@
@
//criaconfservidor.h

class criaConfServidor : public QObject
{
Q_OBJECT
public:
explicit criaConfServidor(QObject *parent = 0);
void connectaThreadComSlot(QThread &processo);

signals:

public slots:
void criaArquivoConf();

};

#endif // CRIACONFSERVIDOR_H
@

steno

You say you have a problem with processo->start(), but the actual code has it as a local variable. Once it leaves scope, the thread will be destoryed. The documentation says this will cause a crash when deleting a thread when isFinished returns false.

guidupas

So, where it must be declared?