QFileDialog for choosing filename to save data

[araglin]

Hello!
Would you please tell me how to append filter text to filename as extension?

Found this solution:
http://www.qtcentre.org/forum/f-qt-p...ht=QFileDialog

but maybe there is a lighter one for such simple (I hope) operation?

void snapShot::on_actionSave_as_activated()
{
	if ( preview->palette().brush ( backgroundRole() ).texture().isNull() )
	{
		QMessageBox::critical ( this,tr ( "Error" ),tr ( "Nothing to save" ),QMessageBox::Ok,0 );
		return;
	}
 
	QString fName;
	QString frmts;
	QFileDialog fd ( this );
	fd.setAcceptMode ( QFileDialog::AcceptSave );
	fd.setWindowTitle ( tr ( "Save as..." ) );
 
	QStringList filters ( fd.nameFilters() );
	filters << tr ( "PNG Images (*.png)" );
	filters << tr ( "JPG Images (*.jpg *.jpeg)" );
	filters << tr ( "XPM Images (*.xpm)" );
	filters << tr ( "All Images (*.png *.jpg *.jpeg *.xpm)" );
	fd.setNameFilters ( filters );
 
	fd.setDirectory ( WorkDir );
	fd.setFileMode ( QFileDialog::AnyFile );
	if ( fd.exec() ==QDialog::Accepted )
	{
		QStringList files = fd.selectedFiles();
		if ( !files.isEmpty() )
			fName = files[0];
	}
	if ( fName.length() >0 )
	{
		if ( saveInFile ( fName ) ) {
 
			if( !QFileInfo(fName).exists() )
				fName.append(".png");
		    setWindowTitle( QFileInfo(fName).absoluteFilePath() + " - " + initWindowTitle);
		}
	}
}

void snapShot::on_actionSave_as_activated()
{
	if ( preview->palette().brush ( backgroundRole() ).texture().isNull() )
	{
		QMessageBox::critical ( this,tr ( "Error" ),tr ( "Nothing to save" ),QMessageBox::Ok,0 );
		return;
	}

	QString fName;
	QString frmts;
	QFileDialog fd ( this );
	fd.setAcceptMode ( QFileDialog::AcceptSave );
	fd.setWindowTitle ( tr ( "Save as..." ) );

	QStringList filters ( fd.nameFilters() );
	filters << tr ( "PNG Images (*.png)" );
	filters << tr ( "JPG Images (*.jpg *.jpeg)" );
	filters << tr ( "XPM Images (*.xpm)" );
	filters << tr ( "All Images (*.png *.jpg *.jpeg *.xpm)" );
	fd.setNameFilters ( filters );

	fd.setDirectory ( WorkDir );
	fd.setFileMode ( QFileDialog::AnyFile );
	if ( fd.exec() ==QDialog::Accepted )
	{
		QStringList files = fd.selectedFiles();
		if ( !files.isEmpty() )
			fName = files[0];
	}
	if ( fName.length() >0 )
	{
		if ( saveInFile ( fName ) ) {

			if( !QFileInfo(fName).exists() )
				fName.append(".png");
		    setWindowTitle( QFileInfo(fName).absoluteFilePath() + " - " + initWindowTitle);
		}
	}
}

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When the user print "file.jpg" - it's ok, but when he print just "file" and then choose filter ("jpg") - exec() returns "file" without any information about desired extension...

Thanks in advance!

[Hiker Hauk]

Usually I use this,

QString fileName = QFileDialog::getOpenFileName(this, tr("Open Book"),
                                                    QDir::currentPath(),
                                                    tr("Books (*.book);;All Files (*)"));

QString fileName = QFileDialog::getOpenFileName(this, tr("Open Book"),
                                                    QDir::currentPath(),
                                                    tr("Books (*.book);;All Files (*)"));

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See your online documentation for the method.

Filter - notice the name "filter" - only affects what you see on the file list.
It has nothing to do with what is returned. This is generic and not specific to Qt.

[araglin]

Thanks for your answer.
Actually I agree with you - filter must only filter, nothing more...
but there was a demand from users, so I solved this issue with the following code, maybe it will be helpful for someone else:

class MyFileDialog : public QFileDialog {
	Q_OBJECT
public:
	MyFileDialog (QWidget *parent = 0);
	virtual ~MyFileDialog();
private slots:
	void appendExtension( const QString& filter);
};
 
MyFileDialog::MyFileDialog(QWidget *parent): QFileDialog(parent) {
	connect(this, SIGNAL(filterSelected( const QString& )), this, SLOT(appendExtension( const QString& )));
}
MyFileDialog::~MyFileDialog() 
{
}
void MyFileDialog::appendExtension( const QString& filter)
{
	setDefaultSuffix("png");
	if (filter.contains("xpm") && !filter.contains("png") ) setDefaultSuffix("xpm");
	else if (filter.contains("jpg") && !filter.contains("png") ) setDefaultSuffix("jpg");
	qDebug() << defaultSuffix();
}

class MyFileDialog : public QFileDialog {
	Q_OBJECT
public:
	MyFileDialog (QWidget *parent = 0);
	virtual ~MyFileDialog();
private slots:
	void appendExtension( const QString& filter);
};

MyFileDialog::MyFileDialog(QWidget *parent): QFileDialog(parent) {
	connect(this, SIGNAL(filterSelected( const QString& )), this, SLOT(appendExtension( const QString& )));
}
MyFileDialog::~MyFileDialog() 
{
}
void MyFileDialog::appendExtension( const QString& filter)
{
	setDefaultSuffix("png");
	if (filter.contains("xpm") && !filter.contains("png") ) setDefaultSuffix("xpm");
	else if (filter.contains("jpg") && !filter.contains("png") ) setDefaultSuffix("jpg");
	qDebug() << defaultSuffix();
}

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