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Qt-interest Archive, April 2007
run error

Message 1 in thread

hi, all
i made a mainwindow by referring the qt examples and compiled it
successfully. and i can't find any error in it. but when i try to run it ,
something happens and i can't run it.
the codes are available in accessories.
have any ideas?
thank you
regards
fengli

<ui version="4.0" >

<ui version="4.0" >
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow" >
  <property name="geometry" >
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="font" >
   <font>
    <family>Arial</family>
    <pointsize>10</pointsize>
   </font>
  </property>
  <property name="windowTitle" >
   <string>G-Code Editor</string>
  </property>
  <property name="windowIcon" >
   <iconset/>
  </property>
  <widget class="QWidget" name="centralwidget" >
   <widget class="QTextEdit" name="textEdit" >
    <property name="geometry" >
     <rect>
      <x>140</x>
      <y>120</y>
      <width>104</width>
      <height>64</height>
     </rect>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar" >
   <property name="geometry" >
    <rect>
     <x>0</x>
     <y>0</y>
     <width>400</width>
     <height>23</height>
    </rect>
   </property>
   <property name="font" >
    <font>
     <family>Arial</family>
    </font>
   </property>
   <widget class="QMenu" name="editMenu" >
    <property name="font" >
     <font>
      <family>Arial</family>
      <pointsize>10</pointsize>
     </font>
    </property>
    <property name="title" >
     <string>&amp;Edit</string>
    </property>
    <addaction name="cutAction" />
    <addaction name="copyAction" />
    <addaction name="pasteAction" />
    <addaction name="separator" />
    <addaction name="selectAllAction" />
   </widget>
   <widget class="QMenu" name="fileMenu" >
    <property name="font" >
     <font>
      <family>Arial</family>
      <pointsize>10</pointsize>
     </font>
    </property>
    <property name="title" >
     <string>&amp;File</string>
    </property>
    <addaction name="newAction" />
    <addaction name="openAction" />
    <addaction name="saveAction" />
    <addaction name="saveAsAction" />
    <addaction name="separator" />
    <addaction name="exitAction" />
   </widget>
   <widget class="QMenu" name="helpMenu" >
    <property name="font" >
     <font>
      <family>Arial</family>
      <pointsize>10</pointsize>
     </font>
    </property>
    <property name="windowTitle" >
     <string/>
    </property>
    <property name="windowIcon" >
     <iconset/>
    </property>
    <property name="title" >
     <string>&amp;Help</string>
    </property>
    <addaction name="aboutAction" />
   </widget>
   <addaction name="fileMenu" />
   <addaction name="editMenu" />
   <addaction name="helpMenu" />
  </widget>
  <action name="newAction" >
   <property name="icon" >
    <iconset/>
   </property>
   <property name="text" >
    <string>&amp;New</string>
   </property>
   <property name="shortcut" >
    <string>Ctrl+N</string>
   </property>
  </action>
  <action name="openAction" >
   <property name="icon" >
    <iconset/>
   </property>
   <property name="text" >
    <string>&amp;Open...</string>
   </property>
   <property name="shortcut" >
    <string>Ctrl+O</string>
   </property>
  </action>
  <action name="saveAction" >
   <property name="icon" >
    <iconset/>
   </property>
   <property name="text" >
    <string>&amp;Save</string>
   </property>
   <property name="shortcut" >
    <string>Ctrl+S</string>
   </property>
  </action>
  <action name="saveAsAction" >
   <property name="text" >
    <string>Save &amp;As...</string>
   </property>
  </action>
  <action name="exitAction" >
   <property name="text" >
    <string>E&amp;xit</string>
   </property>
   <property name="shortcut" >
    <string>Ctrl+Q</string>
   </property>
  </action>
  <action name="cutAction" >
   <property name="icon" >
    <iconset/>
   </property>
   <property name="text" >
    <string>Cu&amp;t</string>
   </property>
   <property name="shortcut" >
    <string>Ctrl+X</string>
   </property>
  </action>
  <action name="copyAction" >
   <property name="icon" >
    <iconset/>
   </property>
   <property name="text" >
    <string>&amp;Copy</string>
   </property>
   <property name="shortcut" >
    <string>Ctrl+C</string>
   </property>
  </action>
  <action name="pasteAction" >
   <property name="icon" >
    <iconset/>
   </property>
   <property name="text" >
    <string>&amp;Paste</string>
   </property>
   <property name="shortcut" >
    <string>Ctrl+V</string>
   </property>
  </action>
  <action name="selectAllAction" >
   <property name="text" >
    <string>Select &amp;All</string>
   </property>
   <property name="shortcut" >
    <string>Ctrl+A</string>
   </property>
  </action>
  <action name="aboutAction" >
   <property name="text" >
    <string>&amp;About</string>
   </property>
  </action>
 </widget>
 <resources>
  <include location="editorresource.qrc" />
 </resources>
 <connections/>
</ui>

#ifndef EDITOR_H

#ifndef EDITOR_H
#define EDITOR_H

#include "ui_editor.h"
#include <QtGui>

class Editor:public QMainWindow, public Ui:: MainWindow
{
	Q_OBJECT
public:
	Editor();
protected:
    void closeEvent(QCloseEvent *event);
private slots:
	void newFile();
	void open();
	bool save();
	bool saveAs();
	void about();
	void documentWasModified();
private:
	void createContextMenu();
	void readSettings();
    void writeSettings();
	bool maybeSave();
	void loadFile(const QString &fileName);
    bool saveFile(const QString &fileName);
    void setCurrentFile(const QString &fileName);
    QString strippedName(const QString &fullFileName);
	QString curFile;
};

#endif
#include "editor.h"

Editor::Editor()
{
	createContextMenu();
	readSettings();

    connect(textEdit->document(), SIGNAL(contentsChanged()),
             this, SLOT(documentWasModified()));
	connect(newAction, SIGNAL(triggered()), this, SLOT(newFile()));
	connect(openAction, SIGNAL(triggered()), this, SLOT(open()));
	connect(saveAction, SIGNAL(triggered()), this, SLOT(save()));
	connect(saveAsAction, SIGNAL(triggered()), this, SLOT(saveAs()));
	connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));
	connect(cutAction, SIGNAL(triggered()), textEdit, SLOT(cut()));
	connect(copyAction, SIGNAL(triggered()), textEdit, SLOT(copy()));
	connect(pasteAction, SIGNAL(triggered()), textEdit, SLOT(paste()));
	connect(selectAllAction, SIGNAL(triggered()), textEdit, SLOT(selectAll()));
	connect(aboutAction, SIGNAL(triggered()), this, SLOT(about()));

	cutAction->setEnabled(false);
    copyAction->setEnabled(false);
    connect(textEdit, SIGNAL(copyAvailable(bool)), cutAction, SLOT(setEnabled(bool)));
    connect(textEdit, SIGNAL(copyAvailable(bool)), copyAction, SLOT(setEnabled(bool)));

    setCurrentFile("");
}

void Editor::createContextMenu()
{
	textEdit->addAction(cutAction);
	textEdit->addAction(copyAction);
	textEdit->addAction(pasteAction);
	textEdit->setContextMenuPolicy(Qt::ActionsContextMenu);
}

 void Editor::closeEvent(QCloseEvent *event)
 {
     if (maybeSave()) {
         writeSettings();
         event->accept();
     } else {
         event->ignore();
     }
 }

 void Editor::newFile()
 {
     if (maybeSave()) {
         textEdit->clear();
         setCurrentFile("");
     }
 }

 void Editor::open()
 {
     if (maybeSave()) {
         QString fileName = QFileDialog::getOpenFileName(this);
         if (!fileName.isEmpty())
             loadFile(fileName);
     }
 }

 bool Editor::save()
 {
     if (curFile.isEmpty()) {
         return saveAs();
     } else {
         return saveFile(curFile);
     }
 }

 bool Editor::saveAs()
 {
     QString fileName = QFileDialog::getSaveFileName(this);
     if (fileName.isEmpty())
         return false;

     return saveFile(fileName);
 }

 void Editor::about()
 {
    QMessageBox::about(this, tr("About Editor"),
             tr("The <b>Application</b> is an G-Code editor, "
                "which is a component part of the NeopenCNC gui, "));
 }

 void Editor::documentWasModified()
 {
     setWindowModified(textEdit->document()->isModified());
 }
 
 void Editor::readSettings()
 {
     QSettings settings("NeopenCNC", "Application Example");
     QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
     QSize size = settings.value("size", QSize(400, 300)).toSize();
     resize(size);
     move(pos);
 }

 void Editor::writeSettings()
 {
     QSettings settings("NeopenCNC", "Application Example");
     settings.setValue("pos", pos());
     settings.setValue("size", size());
 }

 bool Editor::maybeSave()
 {
     if (textEdit->document()->isModified()) {
         QMessageBox::StandardButton ret;
         ret = QMessageBox::warning(this, tr("Editor"),
                      tr("The document has been modified.\n"
                         "Do you want to save your changes?"),
                      QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
         if (ret == QMessageBox::Save)
             return save();
         else if (ret == QMessageBox::Cancel)
             return false;
     }
     return true;
 }

 void Editor::loadFile(const QString &fileName)
 {
     QFile file(fileName);
     if (!file.open(QFile::ReadOnly | QFile::Text)) {
         QMessageBox::warning(this, tr("Editor"),
                              tr("Cannot read file %1:\n%2.")
                              .arg(fileName)
                              .arg(file.errorString()));
         return;
     }

     QTextStream in(&file);
     QApplication::setOverrideCursor(Qt::WaitCursor);
     textEdit->setPlainText(in.readAll());
     QApplication::restoreOverrideCursor();

     setCurrentFile(fileName);
     statusBar()->showMessage(tr("File loaded"), 2000);
 }

 bool Editor::saveFile(const QString &fileName)
 {
     QFile file(fileName);
     if (!file.open(QFile::WriteOnly | QFile::Text)) {
         QMessageBox::warning(this, tr("Editor"),
                              tr("Cannot write file %1:\n%2.")
                              .arg(fileName)
                              .arg(file.errorString()));
         return false;
     }

     QTextStream out(&file);
     QApplication::setOverrideCursor(Qt::WaitCursor);
     out << textEdit->toPlainText();
     QApplication::restoreOverrideCursor();

     setCurrentFile(fileName);
     statusBar()->showMessage(tr("File saved"), 2000);
     return true;
 }

 void Editor::setCurrentFile(const QString &fileName)
 {
     curFile = fileName;
     textEdit->document()->setModified(false);
     setWindowModified(false);

     QString shownName;
     if (curFile.isEmpty())
         shownName = "untitled.ngc";
     else
         shownName = strippedName(curFile);

     setWindowTitle(tr("%1[*] - %2").arg(shownName).arg(tr("Editor")));
 }

 QString Editor::strippedName(const QString &fullFileName)
 {
     return QFileInfo(fullFileName).fileName();
 }

#include "editor.h"

#include "editor.h"
#include <QApplication>

int main(int argc, char **argv)
{
	//Q_INIT_RESOURCE(application);

	QApplication a(argc, argv);
	Editor *editor = new Editor();
	editor->show();
	return a.exec();
}
Message 2 in thread

On 4/12/07, 张凤丽 <zhangfenglisdu@xxxxxxxxx> wrote:

> but when i try to run it ,
> something happens and i can't run it.

What, exactly, happens?

-- 
 [ signature omitted ]
Message 3 in thread

On 4/12/07, 张凤丽 <zhangfenglisdu@xxxxxxxxx> wrote:
> hi, all
> i made a mainwindow by referring the qt examples and compiled it
> successfully. and i can't find any error in it. but when i try to run it ,
> something happens and i can't run it.
> the codes are available in accessories.
> have any ideas?

You're missing two things:

- Instantiating your base class
- Calling Ui::MainWindow::setupUi() to instantiate the UI widgets

Your c'tor should look like this:

Editor::Editor():
    QMainWindow()
{
    setupUi(this);

    /* everything else */
}

-- 
 [ signature omitted ]