[Solved]obdii.cpp:118: error: undefined reference to

jonesy29847

Thank you in advance for your help.

I receige the following message when I compile.

obdii.h
@#ifndef OBDII_H
#define OBDII_H

#include <QtWidgets/QtWidgets>
#include <QtWidgets/QDialog>
#include <QtCore>
#include <QtGui>

class QLabel;
class QLineEdit;
class QPushButton;
class QTreeViewWidget;
class QListWidget;

class obdiiDlg : public QDialog
{
Q_OBJECT

void AddRoot(QString Name, QString Description);
void AddChild(QTreeView *parent, QString Name, QString Description);

public:
obdiiDlg(QWidget *parent = 0);

signals:
void getDTC(const QString &str, Qt::CaseSensitivity cs);
void getPIDData(const QString &str, Qt::CaseSensitivity cs);
void clearMIL(const QString &str, Qt::CaseSensitivity cs);
void printReport(const QString &str, Qt::CaseSensitivity cs);
void goOnline(const QString &str, Qt::CaseSensitivity cs);
void sendData(const QString &str, Qt::CaseSensitivity cs);

private slots:
void btnGetDTCClicked();
void btnGetPIDDataClicked();
void btnClearMILClicked();
void btnGoOnlineClicked();
void btnSendDataClicked();
void btnPrintClicked();

private:
QLabel *lblMessage;
QLabel *lblPIDSelection;

QLabel *lblPIDData;
QTreeWidget *treePIDData;
QPushButton *btnGetDTC;

QLabel *lblSendData;
QLineEdit *editSendData;

QLabel *lblReadData;
QLineEdit *editReadData;

};
#endif // OBDII_H
@

@#include <QtGui>
#include "obdii.h"

obdiiDlg::obdiiDlg(QWidget *parent)
:QDialog(parent)
{
lblMessage = new QLabel(tr("Message"));

lblPIDData = new QLabel(tr("PID data"));
treePIDData = new QTreeWidget;
lblPIDData->setBuddy(treePIDData);

connect(btnGetDTC, SIGNAL(clicked()), this, SLOT(btnGetDTCClicked()));

QVBoxLayout *leftLayout = new QVBoxLayout;
leftLayout->addWidget(lblPIDData);
leftLayout->addWidget(treePIDData);

QHBoxLayout *mainLayout = new QHBoxLayout;
mainLayout->addLayout(leftLayout);

setLayout(mainLayout);
setWindowTitle("OBDII");
setLayout(mainLayout);

}

main.cpp
#include <QtWidgets/QApplication>

#include "obdii.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
obdiiDlg *dialog = new obdiiDlg;
dialog->show();
a.exec();
}
@

obdii.pro
@HEADERS +=
obdii.h

FORMS +=

SOURCES +=
obdii.cpp
main.cpp

QT += widgets

@

SGaist

Hi and welcome to devnet,

From the code you posted, the problem is that you don't implement any of the slots from the class.

jonesy29847

Are you saying that if I define a slot in a class, I must also define the function?

Are there 'cliff notes' for using classes?

Thanks

SGaist

Yes, you must implement the slots, only signals have no implementation.

"Signals & Slots documentation":http://qt-project.org/doc/qt-4.8/signalsandslots.html

jonesy29847

You rock! How do I mark a post as solved
I will get much use out of this forum.

SGaist

:)

You just have to edit your first post and update the title