hello, i posted some days ago a problem with that error, but i noticed that i have to use it whit a .h and a separated .cpp, but know i cant find the solution, i just want to create a program to read, edit and update a file, but if i use the Q_OBJECT macro i get that error, i tried include the QObject header,including all widget classes in .h and tried in .cpp and i always get that error, here is my code
Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QObject>
  5. #include <QFile>
  6. #include <QDataStream>
  7. #include <QLabel>
  8. #include <QLineEdit>
  9. #include <QTextEdit>
  10. #include <QPushButton>
  11. #include <QWidget>
  12.  
  13. class MainWindow : public QWidget {
  14. 	Q_OBJECT
  15. public:
  16. 	MainWindow(QWidget *parent = 0);
  17. private slots:
  18. 	void openfile();
  19. 	void updatefile();
  20. private:
  21. 	QLabel *state;
  22. 	QLineEdit *filePath;
  23. 	QTextEdit *fileContent;
  24. 	QPushButton *open_create;
  25. 	QPushButton *updateFile;
  26. 	QFile *file;
  28. };
  29.  
  30. #endif // MAINWINDOW_H
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and here my constructor
Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) : QWidget(parent) {
  2.  
  3.  
  4. 	resize(600,500);
  5.  
  6. 	filePath = new QLineEdit(".\\test.txt",this);
  7. 	filePath->setGeometry(10,10,400,20);
  8.  
  9. 	open_create = new QPushButton("Open/Create",this);
  10. 	open_create->setGeometry(420,10,90,20);
  11. 	QObject::connect(open_create,SIGNAL(clicked()),this,SLOT(openfile()));
  12.  
  13. 	updateFile = new QPushButton("Update file",this);
  14. 	updateFile->setGeometry(520,10,70,20);
  15.  
  16. 	state = new QLabel("Ready",this);
  17. 	state->setGeometry(10,40,500,50);
  18. 	state->setWordWrap(true);
  19. 	state->setAlignment(Qt::AlignTop);
  20.  
  21. 	fileContent = new QTextEdit(this);;
  22. 	fileContent->setGeometry(10,100,580,390);
  23. }
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