// Get the list of child widgets and layouts of the window

QObjectList children = window->children();

// Iterate through each child

for (QObject *child : children) {

// Remove and delete layouts

if (QLayout *layout = qobject_cast<QLayout*>(child)) {

while (QLayoutItem *item = layout->takeAt(0)) {

if (QWidget *widget = item->widget()) {

widget->deleteLater(); // Delete associated widgets

}

delete item;

}

delete layout; // Delete the layout itself

}

// Delete widgets

if (QWidget *widget = qobject_cast<QWidget*>(child)) {

widget->deleteLater(); // Delete the widget

}

}

: QMainWindow(parent)

, ui(new Ui::App)

{

ui->setupUi(this);

teacher=new Teacher;

QString name = QInputDialog::getText(nullptr, "Input Name", "Enter Student name: ");

int regNo = QInputDialog::getInt(nullptr, "Input Name", "Enter Student name: ");

StudentDetails* newStu=new StudentDetails(regNo,name);

StudentMessages* newStuMsgClass=new StudentMessages(newStu);

stu_msgs.push_back(newStuMsgClass);

QFile file("D:\\CS Lab project\\LabProject\\student.txt");

if (file.open(QIODevice::ReadOnly)) {

QTextStream in(&file);

QVector <QString> name;

QVector<int> reg;

int temp;

QString temp2;

while(!in.atEnd())

{

in>>temp2;

in>>temp;

StudentDetails* newStu=new StudentDetails(temp,temp2);

StudentMessages* newStuMsgClass=new StudentMessages(newStu);

stu_msgs.push_back(newStuMsgClass);

}

}

QFile output("D:\\CS Lab project\\LabProject\\applications.txt");

QTextStream out(&output);

output.open(QIODevice::WriteOnly | QIODevice::Text);

Queue qTemp=q1;

while(!qTemp.isEmpty()){

Node* node= qTemp.returnFront();

out<<node->stu->name<<" "<<node->stu->regNo<<" "<< node->app->subject<<" "<<node->app->msg<<"\n";

qTemp.dequeue();

}

Queue qTemp=q1;

window.setWindowTitle("Messages of Students");

QVBoxLayout *layout = new QVBoxLayout(&window);

while(!qTemp.isEmpty()){

Node* app=qTemp.returnFront();

qDebug()<<"this loop is running";

if(!app){

QMessageBox::warning(this,"Application of Students","No application to review ");

}

QWidget *messageWidget = new QWidget();

QHBoxLayout *messageLayout = new QHBoxLayout(messageWidget);

QLabel *messageLabel = new QLabel("<b style='font-size:larger;text-decoration:underline;' >Student:</b><div style='color:red; '> "+app->stu->name+"("+QString::number(app->stu->regNo)+")</div><br>"+"<b style='font-size:larger;text-decoration:underline'; >Subject:</b> "+app->app->subject+"<br><b style='font-size:larger;'>Message:</b> <br>"+ app->app->msg + "<br>");

messageLayout->addWidget(messageLabel);

QRadioButton *radioButtonYes = new QRadioButton("Yes");

QRadioButton *radioButtonNo = new QRadioButton("No");

// Connect a slot to radio buttons' toggled signal

QObject::connect(radioButtonYes, &QRadioButton::toggled, [=]() {

if(radioButtonYes->isChecked()){

app->app->isApproved=1;

q1.RemoveThisNode(app);

}

});

QObject::connect(radioButtonNo, &QRadioButton::toggled, [=]() {

if (radioButtonNo->isChecked()) {

app->app->isApproved=-1;

q1.RemoveThisNode(app);

}

});

messageLayout->addWidget(radioButtonYes);

messageLayout->addWidget(radioButtonNo);

layout->addWidget(messageWidget);

qTemp.dequeue();

}

window.setLayout(layout);

window.show();

Application* app=new Application;

// Msg and Subject is taken from the another window

// and this is added to the submit application

SubmitApp submitApp; // Create an instance of the SubmitApp window

// Show the SubmitApp window

submitApp.exec();

// Get the subject and message from SubmitApp

QPair<QString, QString> subjectAndMessage = submitApp.getData();

// Use the received subject and message as needed

QString sub = subjectAndMessage.first;

QString msg = subjectAndMessage.second;

app->subject=sub;

app->msg=msg;

stu->addApplication(app);

q1.enqueue(app,stu->getStudentDetails());

QVector<Application*> apps=stu->getApp();

QString str="";

int count=0;

for(auto app : apps){

str+=QString::number(count)+") <b>Subject</b>: "+app->subject;

str+="<br><b style= font-size:large; >Message:</b> <br>"+app->msg;

str+="<br><i style=text-align:right;>"+app->ApprovedOrNot()+" </i>";

str+="<br><br>";

count++;

}

QMessageBox::information(this,"Your Messages",str);

QApplication app(argc, argv);

App window;

window.show();

return app.exec();

{

clearWidgetsFromWindow(&window);

StudentLoginPage student_login_page;

student_login_page.exec();

QPair<QString,int> NameAndRegNo=student_login_page.getNameAndRegNo();

StudentMessages* currStu;

currStu=StudentLogin(NameAndRegNo.second);

if(!currStu) return;

StudentMenu stu_menu;

stu_menu.changeTheLabel("Welcome " + currStu->stu->name + "!");

stu_menu.exec();

if(stu_menu.pressedBtn==1){

SubmitApplication(currStu);

}

if(stu_menu.pressedBtn==2){

ShowMeMyApplication(currStu);

}

{

clearWidgetsFromWindow(&window);

TeacherLoginPage teacher_login_page;

teacher_login_page.exec();

QPair<QString,QString> userNameAndPassword=teacher_login_page.getData();

bool isOk=teacherLogin(userNameAndPassword.first,userNameAndPassword.second);

if(!isOk) {

QMessageBox::warning(this,"Failed to login","Username or password is wrong");

return;

}

TeacherMenu teacher_menu;

teacher_menu.exec();

if(teacher_menu.pressedBtn==1){

QPair<QString,int> nameAndRegNo=teacher_menu.getNameAndRegNo();

// QString password=teacher_menu.getPassword();

StudentDetails* stu=new StudentDetails(nameAndRegNo.second,nameAndRegNo.first);

StudentMessages* newStu=new StudentMessages(stu);

stu_msgs.push_back(newStu);

}

if(teacher_menu.pressedBtn==2){

ShowApplications();

}

if(teacher_menu.pressedBtn==3){

ExtractAndAddStudent();

}

if(teacher_menu.pressedBtn==4){

outPutDataToFile();

}