Qt之QVariant的使用分析

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); setWindowTitle(QStringLiteral("Qt之QVariant的使用分析")); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_2_clicked() { m_pVariant.setValue(5); ui->textEdit->append(QString::number(m_pVariant.toInt())); } void MainWindow::on_pushButton_clicked() { m_pVariant.setValue(QString("aaa")); ui->textEdit->append(m_pVariant.toString()); } void MainWindow::on_pushButton_9_clicked() { m_pVariant.setValue(1.1); ui->textEdit->append(QString::number(m_pVariant.toDouble())); } void MainWindow::on_pushButton_10_clicked() { ui->textEdit->append(QStringLiteral("太TM多了，你自己一个一个试吧！")); } void MainWindow::on_pushButton_4_clicked() { if (m_pVariant.isNull()) ui->textEdit->append("Null"); else ui->textEdit->append("NoNull"); } void MainWindow::on_pushButton_3_clicked() { m_pVariant.setValue(QString("12hf6")); if (m_pVariant.convert(QMetaType::Int)) ui->textEdit->append("Int"); else ui->textEdit->append("NoInt"); } void MainWindow::on_pushButton_11_clicked() { m_pVariant.setValue(QString("12hf6")); if (m_pVariant.canConvert(QMetaType::Int)) ui->textEdit->append("Int"); else ui->textEdit->append("NoInt"); } void MainWindow::on_pushButton_6_clicked() { m_pVariant.clear(); } void MainWindow::on_pushButton_12_clicked() { if (m_pVariant.isValid()) ui->textEdit->append("true"); else ui->textEdit->append("false"); } void MainWindow::on_pushButton_5_clicked() { ui->textEdit->append(QString::number(m_pVariant.type())); } void MainWindow::on_pushButton_13_clicked() { ui->textEdit->append(m_pVariant.typeName()); } void MainWindow::on_pushButton_14_clicked() { ui->textEdit->append(QString::number(m_pVariant.userType())); }