Static functions and class members

[Raistlin]

There is a problem when multiple errors occur in a row. Normally they should be queued. If I do not make the QMainWindow a parent, only the first error is shown and the others are just dismissed. This has nothing to do with the checkbox for ignoring the same errors in the future, it is just a difference in behaviour regarding the parent selection. I have to admit this does not make that much sense to me.

[wysota]

Do you use threads?

[Raistlin]

No, I don't use threads. I tried it as a work-around, but got stuck there too. Also seemed to be too complicated for what I need.

Here is some code to illustrate things :

.h file :

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QtGui/QMainWindow>
#include "OctoObject.h"
 
class QErrorMessage;
class OctoNormalise;
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~MainWindow();
 
private:
	OctoNormalise* normalise;
 
	//All static objects to allow for the use of the static callback function
	static QErrorMessage* errorMessage; 	
	static void _stdcall errorHandler(OctoObject::error_code error);	
 
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>
#include "OctoObject.h"

class QErrorMessage;
class OctoNormalise;

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~MainWindow();

private:
	OctoNormalise* normalise;

	//All static objects to allow for the use of the static callback function
	static QErrorMessage* errorMessage; 	
	static void _stdcall errorHandler(OctoObject::error_code error);	
	
};

#endif // MAINWINDOW_H

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.cpp file :

#include "QTGUI"
#include "mainwindow.h"
#include "OctoNormalise.h"
 
QErrorMessage* MainWindow::errorMessage = 0;
 
MainWindow::MainWindow(QWidget *parent, Qt::WFlags flags)
    : QMainWindow(parent, flags)
{
	//Create the QErrorMessage Object 
	errorMessage = new QErrorMessage;
 
	//Set the error handler
	OctoObject::setErrorHandler(&MainWindow::errorHandler);		
 
	//Create an object from the SDK as a test (this force the generation of several errors the way it is done now)
	normalise = new OctoNormalise;
 
}
 
void __stdcall MainWindow::errorHandler(OctoObject::error_code error)
{
	//Select the dialog text based on the error coming from the SDK
 
	switch (error)
	{ 
	case OctoObject::HaspErr : errorMessage->showMessage(QString("No valid HASP key available")); break;
	case OctoObject::FileOpenErr : errorMessage->showMessage(QString("File could not be found/opened")); break;
	// ...
	}	
}
 
MainWindow::~MainWindow()
{
	//Delete all used objects
	delete normalise;
	delete errorMessage;
 
	//Resets the error handler to a dummy function (not actually NULL, this is implemented in the SDK to be handled safely)
	OctoObject::setErrorHandler(NULL);
 
}

#include "QTGUI"
#include "mainwindow.h"
#include "OctoNormalise.h"

QErrorMessage* MainWindow::errorMessage = 0;

MainWindow::MainWindow(QWidget *parent, Qt::WFlags flags)
    : QMainWindow(parent, flags)
{
	//Create the QErrorMessage Object 
	errorMessage = new QErrorMessage;

	//Set the error handler
	OctoObject::setErrorHandler(&MainWindow::errorHandler);		
	
	//Create an object from the SDK as a test (this force the generation of several errors the way it is done now)
	normalise = new OctoNormalise;
	
}

void __stdcall MainWindow::errorHandler(OctoObject::error_code error)
{
	//Select the dialog text based on the error coming from the SDK

	switch (error)
	{ 
	case OctoObject::HaspErr : errorMessage->showMessage(QString("No valid HASP key available")); break;
	case OctoObject::FileOpenErr : errorMessage->showMessage(QString("File could not be found/opened")); break;
	// ...
	}	
}

MainWindow::~MainWindow()
{
	//Delete all used objects
	delete normalise;
	delete errorMessage;

	//Resets the error handler to a dummy function (not actually NULL, this is implemented in the SDK to be handled safely)
	OctoObject::setErrorHandler(NULL);

}

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[Raistlin]

Hmm, I noticed there are strange things going on with the callback pointer, it seems to change. Maybe this is not entirely Qt related, I am going to contact the supplier.

Off course, this does not change the fact it is a pity the static function can not access members of the class. Any suggestions there remain interesting .