Status Bar

[waynew]

Is it possible to pass a value to the status bar in the main window with a signal/slot? From a dialog? I'm having trouble figuring out the right code.
Any suggestions or pointers to examples?

[wysota]

What kind of value? What do you want to do with it?

[waynew]

Thanks Wysota. I have a function that updates a QString/varchar database field.
When that changes, I want to display the new value in the status bar as a permanent message preceded by some text. The text appears ok, but when I try code to pass the value, I can't get a compile. Just my lack of Qt knowledge, but I can't seem to find any references to doing this. Can't find anything in my books or online.
Here are some code snippets of what I tried:

class ControlDB:public QObject
{
   Q_OBJECT
 
   public:
    ControlDB(QObject *parent = 0);
    void makeControlDB();
    void setLastLog(QString);
    void setOper(QString);
    QString getLastLog();
    QString getOper();
 
    signals:
    void valueChanged(QString newValue);
}
 
//cpp file
ControlDB::ControlDB(QObject *parent)
{
 
}
void ControlDB::setOper(QString oper) {
   //some code to change the oper value
   emit valueChanged(oper);
}
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setupActions();
 
    mStatLabel = new QLabel;
    statusBar()->addPermanentWidget(mStatLabel);
    ControlDB ctrl;
    connect(&ctrl, SIGNAL(valueChanged(QString)), this, SLOT(updateStats(QString)));
    updateStats(QString);
}
 
void MainWindow::updateStats(oper)
{
  QString operOutput = "Current op is " + oper;
  mStatLabel->setText(operOutput);
}

class ControlDB:public QObject
{
   Q_OBJECT

   public:
    ControlDB(QObject *parent = 0);
    void makeControlDB();
    void setLastLog(QString);
    void setOper(QString);
    QString getLastLog();
    QString getOper();

    signals:
    void valueChanged(QString newValue);
}

//cpp file
ControlDB::ControlDB(QObject *parent)
{

}
void ControlDB::setOper(QString oper) {
   //some code to change the oper value
   emit valueChanged(oper);
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setupActions();

    mStatLabel = new QLabel;
    statusBar()->addPermanentWidget(mStatLabel);
    ControlDB ctrl;
    connect(&ctrl, SIGNAL(valueChanged(QString)), this, SLOT(updateStats(QString)));
    updateStats(QString);
}

void MainWindow::updateStats(oper)
{
  QString operOutput = "Current op is " + oper;
  mStatLabel->setText(operOutput);
}

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Thanks for any assistance.

[wysota]

What is the error you get?

Line #37 of the code above is surely incorrect. It should probably say:

updateStats(QString());

updateStats(QString());

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