Qt Creat or crashes when QPrinter object is declared

**fredykhan** · 18th February 2011, 15:49

Hello,

I am using QT 4.6.3. When I create an object of QPrinter (i.e QPrinter printer()),
Qt Creator crashes at this declaration. I debuged to this statement and as i press F10 to execute this statement gdb crashes with error " gdb.exe (process id 4063) crashed"

I would appreciate a prompt response in this regard.

Thank You

**high_flyer** · 18th February 2011, 16:02

Please post the full method where this line is in.

**fredykhan** · 18th February 2011, 16:06

Here is my code....the debuger crashes on the QPrinter printer decleration

Qt Code:

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void mainScreen::printreport()
{
    QSqlTableModel *model;
    QPrinter printer;
    model = new QSqlTableModel(this);
    model->setTable("instreportview");
    model->select();
    QString dir = QFileDialog::getExistingDirectory(this, tr("Folder to store report in"),
                                                     "/home",
                                                     QFileDialog::ShowDirsOnly);
//                                                     | QFileDialog::DontResolveSymlinks);
    checkdialog=false;
    userprompt = new QDialog(this);
    QString note="Please enter below the file name by which you want to save the report.";
    note+=" The report will be saved on the desktop";
    QLabel *userinfo=new QLabel(this);
    userinfo->setText(note);
    //QLabel *directory
    QLabel *fnamelabel= new QLabel(tr("File Name"));
    fname= new QLineEdit(this);
    QPushButton *_cancelInfo = new QPushButton(tr("&Cancel"));
    QPushButton *_saveInfo = new QPushButton(tr("&Save"));
    QVBoxLayout *buttonlay = new QVBoxLayout(this);
    QVBoxLayout *leftlay = new QVBoxLayout(this);
    QHBoxLayout *labellay = new QHBoxLayout(this);
    QHBoxLayout *mainlay = new QHBoxLayout(this);
    _cancelInfo->setDefault(true);
    _saveInfo->setDefault(true);
    buttonlay->addWidget(_cancelInfo);
    buttonlay->addWidget(_saveInfo);
 
    labellay->addWidget(fnamelabel);
    labellay->addWidget(fname);
 
    //leftlay->addWidget(userinfo);
    //leftlay->addLayout(labellay);
 
    mainlay->addLayout(labellay);
    mainlay->addLayout(buttonlay);
 
    userprompt->setLayout(mainlay);
    connect(_cancelInfo,SIGNAL(clicked()),this,SLOT(dialogcancel()));
    connect(_saveInfo,SIGNAL(clicked()),this,SLOT(dialogsave()));
    userprompt->exec();
    QString filename=fname->text();
 
    QFont head1;
    head1.setBold(true);
    head1.setPixelSize(18);
    QString heading;//=head.bold();
    heading="                           Bank Relationship Management System";
    QTextCharFormat charformat;
    charformat.setFont(head1);
    charformat.setVerticalAlignment(QTextCharFormat::AlignMiddle);
    doc=new QTextDocument();
 
    cursor= new QTextCursor(doc);
    cursor->movePosition(QTextCursor::WordRight,QTextCursor::MoveAnchor,2);
    cursor->insertText(heading,charformat);
    cursor->movePosition(QTextCursor::Down,QTextCursor::MoveAnchor,2);
    QTextTableFormat tableFormat;
    tableFormat.setCellPadding(5);
    tableFormat.setHeaderRowCount(1);
    tableFormat.setBorderStyle(
                      QTextFrameFormat::BorderStyle_Solid);
    tableFormat.setWidth(QTextLength(
                      QTextLength::PercentageLength, 100));
    int rows=model->rowCount();
    int cols=model->columnCount();
    cursor->insertTable(rows,cols,tableFormat);
 
    cursor->insertText(QObject::tr("Instrument Number"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Opening Bank"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Opening Branch"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Second Party"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Type"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Sub Type"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Status"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Amount"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Local Comptuted Cost"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Computed Cost"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Negotiated Cost"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Currency"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Opening Date"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Closing Date"));
 
    QTextTable *table = cursor->currentTable();
    for(int i=0;i<model->rowCount();i++)
    {
 
       table->appendRows(1);
       //cursor->movePosition(QTextCursor::PreviousRow);
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(0).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(1).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(2).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(3).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(4).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(5).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(6).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(7).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(8).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(9).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(10).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(11).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(12).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(13).toString());
   }
 
    doc->setMetaInformation(QTextDocument::DocumentTitle,heading);
 
    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setOrientation(QPrinter::Landscape);
    printer.setPaperSize(QPrinter::A4);
    //printer.setResolution(QPrinter::HighResolution);
    QString fpathname="C:/Documents and Settings/fredy/Desktop/";
    QString fullname= dir+filename+".pdf";
    printer.setOutputFileName(fullname);
     QPainter painter;
 
     QRectF rect=QRectF();
      rect.setWidth(printer.width());//doc->textWidth());
      rect.setHeight(printer.height());
        if (! painter.begin(&printer)) { // failed to open file
            qWarning("failed to open file, is it writable?");
            //return 1;
        }
        else
        {
            if(checkdialog==true)
            {
                doc->drawContents(&painter, rect);
                QString mess="Report Saved!";
                QMessageBox msg(this);
                msg.setText(mess);
                msg.exec();
                checkdialog=false;
            }
 
 
        }
       painter.end();
 
}

void mainScreen::printreport()
{
    QSqlTableModel *model;
    QPrinter printer;
    model = new QSqlTableModel(this);
    model->setTable("instreportview");
    model->select();
    QString dir = QFileDialog::getExistingDirectory(this, tr("Folder to store report in"),
                                                     "/home",
                                                     QFileDialog::ShowDirsOnly);
//                                                     | QFileDialog::DontResolveSymlinks);
    checkdialog=false;
    userprompt = new QDialog(this);
    QString note="Please enter below the file name by which you want to save the report.";
    note+=" The report will be saved on the desktop";
    QLabel *userinfo=new QLabel(this);
    userinfo->setText(note);
    //QLabel *directory
    QLabel *fnamelabel= new QLabel(tr("File Name"));
    fname= new QLineEdit(this);
    QPushButton *_cancelInfo = new QPushButton(tr("&Cancel"));
    QPushButton *_saveInfo = new QPushButton(tr("&Save"));
    QVBoxLayout *buttonlay = new QVBoxLayout(this);
    QVBoxLayout *leftlay = new QVBoxLayout(this);
    QHBoxLayout *labellay = new QHBoxLayout(this);
    QHBoxLayout *mainlay = new QHBoxLayout(this);
    _cancelInfo->setDefault(true);
    _saveInfo->setDefault(true);
    buttonlay->addWidget(_cancelInfo);
    buttonlay->addWidget(_saveInfo);

    labellay->addWidget(fnamelabel);
    labellay->addWidget(fname);

    //leftlay->addWidget(userinfo);
    //leftlay->addLayout(labellay);

    mainlay->addLayout(labellay);
    mainlay->addLayout(buttonlay);

    userprompt->setLayout(mainlay);
    connect(_cancelInfo,SIGNAL(clicked()),this,SLOT(dialogcancel()));
    connect(_saveInfo,SIGNAL(clicked()),this,SLOT(dialogsave()));
    userprompt->exec();
    QString filename=fname->text();

    QFont head1;
    head1.setBold(true);
    head1.setPixelSize(18);
    QString heading;//=head.bold();
    heading="                           Bank Relationship Management System";
    QTextCharFormat charformat;
    charformat.setFont(head1);
    charformat.setVerticalAlignment(QTextCharFormat::AlignMiddle);
    doc=new QTextDocument();

    cursor= new QTextCursor(doc);
    cursor->movePosition(QTextCursor::WordRight,QTextCursor::MoveAnchor,2);
    cursor->insertText(heading,charformat);
    cursor->movePosition(QTextCursor::Down,QTextCursor::MoveAnchor,2);
    QTextTableFormat tableFormat;
    tableFormat.setCellPadding(5);
    tableFormat.setHeaderRowCount(1);
    tableFormat.setBorderStyle(
                      QTextFrameFormat::BorderStyle_Solid);
    tableFormat.setWidth(QTextLength(
                      QTextLength::PercentageLength, 100));
    int rows=model->rowCount();
    int cols=model->columnCount();
    cursor->insertTable(rows,cols,tableFormat);

    cursor->insertText(QObject::tr("Instrument Number"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Opening Bank"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Opening Branch"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Second Party"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Type"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Sub Type"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Status"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Amount"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Local Comptuted Cost"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Computed Cost"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Negotiated Cost"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Currency"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Opening Date"));
    cursor->movePosition(QTextCursor::NextCell);
    cursor->insertText(QObject::tr("Closing Date"));

    QTextTable *table = cursor->currentTable();
    for(int i=0;i<model->rowCount();i++)
    {

       table->appendRows(1);
       //cursor->movePosition(QTextCursor::PreviousRow);
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(0).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(1).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(2).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(3).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(4).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(5).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(6).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(7).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(8).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(9).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(10).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(11).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(12).toString());
       cursor->movePosition(QTextCursor::NextCell);
       cursor->insertText(model->record(i).value(13).toString());
   }

    doc->setMetaInformation(QTextDocument::DocumentTitle,heading);

    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setOrientation(QPrinter::Landscape);
    printer.setPaperSize(QPrinter::A4);
    //printer.setResolution(QPrinter::HighResolution);
    QString fpathname="C:/Documents and Settings/fredy/Desktop/";
    QString fullname= dir+filename+".pdf";
    printer.setOutputFileName(fullname);
     QPainter painter;

     QRectF rect=QRectF();
      rect.setWidth(printer.width());//doc->textWidth());
      rect.setHeight(printer.height());
        if (! painter.begin(&printer)) { // failed to open file
            qWarning("failed to open file, is it writable?");
            //return 1;
        }
        else
        {
            if(checkdialog==true)
            {
                doc->drawContents(&painter, rect);
                QString mess="Report Saved!";
                QMessageBox msg(this);
                msg.setText(mess);
                msg.exec();
                checkdialog=false;
            }


        }
       painter.end();

}

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**high_flyer** · 18th February 2011, 16:16

you mean the line 4 in the code above?

**fredykhan** · 18th February 2011, 16:21

yes the line 4 and i know it sounds stupid

**high_flyer** · 18th February 2011, 16:24

What happens if you put a debug statement, and run application directly, without stepping through?

**fredykhan** · 18th February 2011, 17:34

can you briefly describe what do u mean by debug statement. do u mean break point or something else.

**wysota** · 18th February 2011, 18:00

Originally Posted by fredykhan

Hello,

I am using QT 4.6.3. When I create an object of QPrinter (i.e QPrinter printer()),
Qt Creator crashes at this declaration. I debuged to this statement and as i press F10 to execute this statement gdb crashes with error " gdb.exe (process id 4063) crashed"

I would appreciate a prompt response in this regard.

Qt Code:

Switch view

QPrinter printer();

QPrinter printer();

To copy to clipboard, switch view to plain text mode

This is a declaration of a function called "printer" that takes no parameters and returns a QPrinter object and not a declaration of a QPrinter instance called "printer". Try to be explicit when you say something

Also does QtCreator crash or does your app crash?

**high_flyer** · 18th February 2011, 18:02

But wysota, look at his code, he is calling it so:

Qt Code:

Switch view

QPrinter printer;

QPrinter printer;

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**wysota** · 18th February 2011, 18:04

I know, it's just in the first post he said it was "QPrinter printer()".

**fredykhan** · 18th February 2011, 18:15

sorry for my mistake actually I ment "QPrinter printer;" . wysota my app does not crash nor does my QT creator. Actually this is the function to print a report. If i am running the program and click the button that calls this function, everything works fine but no report is created. So, when i debug to this line, the gdb crashes Here
i get the error. "The application "gdb.exe" (process id 3088) crashed. Would you like to debug?"

**wysota** · 18th February 2011, 18:25

So why are you posting this problem here and not on some gdb forum?

**fredykhan** · 18th February 2011, 18:36

because it is happening on QPrinter object decleration and nowhere else

**wysota** · 18th February 2011, 18:44

Originally Posted by fredykhan

because it is happening on QPrinter object decleration and nowhere else

Tough luck, still we can't help you with this. Try debugging the debugger and see where it crashes :]

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