Hello.
I'm currently learning how to program in c++ with qt and I'm having a problem when trying to emit a signal to a second mainwindow.
The whole idea is to emit a signal inside a function in the first form and catch it in the second form to add a line to a textEdit.
The idea is to use the second form as some type of debug console, there i want to show debuggin messages so to avoid having a system console open to show the qDebug messages and to provide a save and report mechanism to the messages.

I wrote this simple example to demostrate my problem.

main.cpp
Qt Code: 
  1. #include <QtGui>
  2. #include "first.h"
  3. #include "second.h"
  4.  
  5. int main(int argc, char** argv)
  6. {
  7.     QApplication app(argc, argv);
  8.  
  9.     first f;
  10.     f.show();
  11.  
  12.     second s;
  13.     s.show();
  14.  
  15.     return app.exec();
  16. }
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first.cpp
Qt Code: 
  1. #include <QtGui>
  2.  
  3. #include "first.h"
  4. #include "second.h"
  5.  
  6. first::first()
  7. {
  8.  
  9.     QPushButton *button = new QPushButton("First", this);
  10.     setCentralWidget( button );
  11.  
  12.  
  13.     QString text = "test";
  14.     connect( button, SIGNAL ( clicked() ) ,this, SLOT( doemit() ));
  15.  
  16.     //if i uncomment the next two lines the program stales and never shows the forms
  17.     //second s;  
  18.     //connect( this, SIGNAL(MySignal(QString)), &s, SLOT( add() ));
  19.  
  20. }
  21.  
  22. first::~first()
  23. {}
  24.  
  25. void first::doemit() {
  26.  
  27.   qDebug() << "doemit called";
  28.  
  29.   QString test = "text";
  30.   emit MySignal(test);
  31.  
  32. }
  33.  
  34. #include "first.moc"
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first.h
Qt Code: 
  1. #ifndef first_H
  2. #define first_H
  3.  
  4. #include <QtGui/QMainWindow>
  5.  
  6. class first : public QMainWindow
  7. {
  8. Q_OBJECT
  9. public:
  10.     first();
  11.     virtual ~first();
  12.  
  13. public slots:
  14.   void doemit();
  15.  
  16. signals:
  17.     void MySignal( QString );
  18. };
  19.  
  20. #endif // first_H
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second.cpp
Qt Code: 
  1. #include "second.h"
  2. #include "first.h"
  3.  
  4. #include <QtGui>
  5. #include <QTextEdit>
  6.  
  7. second::second() {   
  8.  
  9.      textEdit = new QTextEdit;
  10.      setCentralWidget(textEdit);
  11.  
  12.      first f;
  13.      connect(&f, SIGNAL(MySignal(QString)), this, SLOT(add()));
  14. }
  15.  
  16. second::~second(){}
  17.  
  18. void second::add(){
  19.   qDebug() << "Slot Called";
  20.   textEdit->append ( "Blah" );
  21. }
  22.  
  23. #include "second.moc"
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second.h
Qt Code: 
  1. #ifndef second_H
  2. #define second_H
  3.  
  4. #include <QtGui>
  5. #include <QTextEdit>
  6.  
  7. class second : public QMainWindow
  8. {
  9. Q_OBJECT
  10. public:
  11.     second();
  12.     virtual ~second();
  13.     QTextEdit *textEdit;
  14.  
  15. public slots:
  16.       void add();
  17. };
  18.  
  19. #endif // second_H
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What happens with the program is that doemit() is called in first.cpp but never reaches the slot in second.cpp.
if i try to reverse the connection, as in commenting the connect line in second.cpp and uncommenting the connect in first the same happens
but if i leave both connects the program starts but nothing is show in screen.

Maybe i can't have to mainwindows as one blocks the other and i need to dig into threading, but i would like to avoid that.

I hope that my problem is clear, as I'm not a native english speaker maybe my writing is a little cryptic at best.