Signal and Slot Problem

[waynew]

Just when I thought I had signals and slots figured out ... not so.
I have one class (editlog) that sends a signal to a slot in the mainwindow, and it works fine.
So I set up another one from a different class (openlog), and ... nothing, no response.

Here is the code that works ok:

// part of editlog.h
signals:
     void addLookup(int);
 
// part of editlog.cpp
void EditLog::on_pushButton_clicked()
{
    emit addLookup(::logID);
}
 
// part of mainwindow.h
public:
   EditLog *el;
 
public slots:
   void updateLog(int);
 
// part of mainwindow.cpp
 
 el = new EditLog;
  // Signal connection from EditLog class
  connect(el, SIGNAL(addLookup(int)), this, SLOT(updateLog(int)));
 
void MainWindow::updateLog(int newID)
{
// code updates log ok
}

// part of editlog.h
signals:
     void addLookup(int);

// part of editlog.cpp
void EditLog::on_pushButton_clicked()
{
    emit addLookup(::logID);
}

// part of mainwindow.h
public:
   EditLog *el;

public slots:
   void updateLog(int);

// part of mainwindow.cpp

 el = new EditLog;
  // Signal connection from EditLog class
  connect(el, SIGNAL(addLookup(int)), this, SLOT(updateLog(int)));

void MainWindow::updateLog(int newID)
{
// code updates log ok
}

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Here is the code that seems to do nothing:

// part of openlog.h // this is a dialog
 
signals:
  void callOpenLog(QString);
 
// part of openlog.cpp
 
void OpenLog::on_pbOpen_clicked()
{
   QString openLog = ui->cbLogName->currentText();
   emit callOpenLog(openLog);
   close();  // the dialog window
}
 
// part of mainwindow.h
public:
   OpenLog *ol;
 
// part of mainwindow.cpp
   ol = new OpenLog;
  connect(ol, SIGNAL(callOpenLog(QString)), this, SLOT(openLog(QString)));
 
void MainWindow::openLog(QString logName) // never called
{
   // code would open the log if the signal was received
}

// part of openlog.h // this is a dialog

signals:
  void callOpenLog(QString);

// part of openlog.cpp

void OpenLog::on_pbOpen_clicked()
{
   QString openLog = ui->cbLogName->currentText();
   emit callOpenLog(openLog);
   close();  // the dialog window
}

// part of mainwindow.h
public:
   OpenLog *ol;

// part of mainwindow.cpp
   ol = new OpenLog;
  connect(ol, SIGNAL(callOpenLog(QString)), this, SLOT(openLog(QString)));

void MainWindow::openLog(QString logName) // never called
{
   // code would open the log if the signal was received
}

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Could this have something to do with the fact that the signal from the class that works comes from a dialog window that does not get closed after the signal is sent and the one that does not work comes from a dialog class where the window gets closed right after the signal is sent. If so, how to make it work? Or what else is wrong?