포맷 파일 예외가 try catch 블록에 의해 무시되었습니다.

Question

Windows 탐색기를 사용하여 파일을 선택하여 XML 파일에서 데이터를로드해야합니다. 다른 형식, 다른 XML을 선택하면 catch 블록에서 예외를 가져와야합니다. 하지만 그렇지 않아 응용 프로그램이 실패합니다. 지금까지 작성한 코드는 다음과 같습니다. 내가 뭘 놓치고 있니? xml 메서드에서 readVehicles(QString fileName)의 실행을 보냅니다.

QList<Vehicle> VehicleHelper::readVehicles(QString fileName){ 

    QList<Vehicle> vehicles; 
    Vehicle newVehicle; 
    QFile file(fileName); 
    QDomDocument document; 
    if(!file.open(QIODevice::ReadOnly | QIODevice::Text)){ 
     throw FileCannotBeOpenException(); 
    } 
    else{ 
     if(!document.setContent(&file)){ 
      throw InvalidXMLContentException(); 
     } 
     file.close(); 
    } 

    QDomElement root = document.firstChildElement(); 
    QDomNodeList carElements = root.elementsByTagName("Car"); 
    for(int i = 0; i < carElements.size(); i++){ 

     QDomNode carNode = carElements.at(i); 

     QDomElement carElement = carNode.toElement(); 
     QString carID = carElement.attribute("ID"); 

     //if the idNumber is null, generate one 
     if(carID.isEmpty()){ 
      QUuid newId = Vehicle::generateID(); 
      newVehicle.setVehicleId(newId); 
     } 
     else { 
      QUuid id; 
      try{ 
       id = QUuid::QUuid(carID); 
      } catch(QException &ex){ 
       continue; 
     } 
     newVehicle.setVehicleId(id); 
    } 

    //Owner 
    //**************************************************************** 
    QDomElement ownerElement = carNode.firstChildElement("Owner"); 

    //FirstName 
    QDomElement fNameElement = ownerElement.firstChildElement("FirstName"); 
    QString fName = fNameElement.text(); 


    //LastName 
    QDomElement lNameElement = fNameElement.nextSiblingElement("LastName"); 
    QString lName = lNameElement.text(); 



    //Address 
    QDomElement addressElement = lNameElement.nextSiblingElement("Address"); 
    QString address = addressElement.text(); 

    //append vehicle to the list 
    vehicles.append(newVehicle); 
    } 
} 

은과 시도-catch 블록은 on_actionOpen_triggered() 방법 당신은 마지막 네 문자가 QFile로 보내기 전에 QString에 ".xml"을 경우 확인해야

void MainWindow::on_actionOpen_triggered() 
{ 
    if(isModified){ 
     QMessageBox msgBox; 
     QString message = "There are unsaved changes! Do you proceed? "; 
     msgBox.setWindowTitle("Save Changes"); 
     msgBox.setText(message); 
     msgBox.addButton("Don't save",QMessageBox::NoRole); 
     msgBox.addButton(QMessageBox::Save); 
     msgBox.addButton(QMessageBox::Cancel); 
     msgBox.setIcon(QMessageBox::Question); 
     int result = msgBox.exec(); 
     if(result == QMessageBox::Save){ 
      VehicleHelper::writeVehicles(cars,filename); 
      msgBox.close(); 
     } else { 
      QString fileName = QFileDialog::getOpenFileName(this,"Open file"); 
      if(!fileName.isEmpty()){ 
       setFileName(fileName); 
       QFile file(fileName); 
       try { 
        cars = VehicleHelper::readVehicles(fileName); 
       } catch(FileCannotBeOpenException &ex) { 
        QMessageBox msgBox; 
        msgBox.setIcon(QMessageBox::Critical); 
        msgBox.setWindowTitle("Message!"); 
        msgBox.setText("Failed to open file"); 
        msgBox.setDefaultButton(QMessageBox::Ok); 
        msgBox.exec(); 
        return; 

       } catch(InvalidXMLContentException &ex){ 
        QMessageBox msgBox; 
        msgBox.setIcon(QMessageBox::Critical); 
        msgBox.setWindowTitle("Message!"); 
        msgBox.setText("Failed to load data!"); 
        msgBox.setDefaultButton(QMessageBox::Ok); 
        msgBox.exec(); 
        return; 
       } 

       setTakenNumbersList(cars); 
       //set data to the table view 
       populate(cars); 
      } 
     } 
    } else { 
     QString fileName = QFileDialog::getOpenFileName(this,"Open file"); 
     if(!fileName.isEmpty()){ 
      setFileName(fileName); 
      QFile file(fileName); 
      if(file.open(QFile::ReadOnly | QFile::Text)){ 
       cars = VehicleHelper::readVehicles(fileName); 
       setTakenNumbersList(cars); 
       file.close(); 

       //set data to the table view 
       populate(cars); 

       ui->actionAdd->setEnabled(true); 
       ui->actionBy_name->setEnabled(true); 
       ui->actionBy_registration_date->setEnabled(true); 
       ui->actionBy_registration_number->setEnabled(true); 
       ui->actionBy_revision_date->setEnabled(true); 
       ui->actionBy_type->setEnabled(true); 
       ui->actionClear_Search->setEnabled(true); 
       ui->actionDelete->setEnabled(true); 
       ui->actionEdit->setEnabled(true); 
       ui->actionSave->setEnabled(true); 
       ui->actionSave_As->setEnabled(true); 
      } 
     } 

    } 
} 

Answer 1

입니다.