Qt：图片切割

void MainWindow::on_action_slice_triggered()
{QDialog *dialog = new QDialog(this);dialog->setWindowTitle("切割");dialog->setFixedSize(200, 150);QVBoxLayout *vbox = new QVBoxLayout;QHBoxLayout *hbox = new QHBoxLayout;QLabel *label = new QLabel("方向");hbox->addWidget(label);QComboBox *comboBox = new QComboBox;QStringList SL_direction;SL_direction << "竖向" << "横向";comboBox->addItems(SL_direction);hbox->addWidget(comboBox);vbox->addLayout(hbox);hbox = new QHBoxLayout;label = new QLabel("份数");hbox->addWidget(label);QLineEdit *lineEdit = new QLineEdit;QString sn = settings.value("Slice", "5").toString();lineEdit->setText(sn);hbox->addWidget(lineEdit);vbox->addLayout(hbox);label = new QLabel;label->setAlignment(Qt::AlignCenter);vbox->addWidget(label);connect(comboBox, &QComboBox::currentTextChanged, [=]{label->setText("");});connect(lineEdit, &QLineEdit::textChanged, [=]{label->setText("");});QPushButton *pushButton_confirm = new QPushButton("确定");QPushButton *pushButton_cancel = new QPushButton("取消");hbox = new QHBoxLayout;hbox->addStretch();hbox->addWidget(pushButton_confirm);hbox->addWidget(pushButton_cancel);hbox->addStretch();vbox->addLayout(hbox);dialog->setLayout(vbox);    dialog->show();connect(pushButton_confirm, &QPushButton::clicked, [=]{bool b;int n = lineEdit->text().toInt(&b, 10);if (b) {for (int i=0; i<n; i++) {QImage image;if (comboBox->currentIndex() == 0) {int dy = imageWidget->image.height() / n;image = imageWidget->image.copy(0, dy * i, imageWidget->image.width(), dy);} else if (comboBox->currentIndex() == 1) {int dx = imageWidget->image.width() / n;image = imageWidget->image.copy(dx * i, 0, dx, imageWidget->image.height());}QString fp = "";if (path == "")fp = QStandardPaths::writableLocation(QStandardPaths::DesktopLocation) + "/" + comboBox->currentText() + QString::number(i) + ".png";elsefp = QFileInfo(path).path() + "/" + QFileInfo(filename).baseName() + comboBox->currentText() + QString::number(i) + "." + QFileInfo(filename).suffix();//qDebug() << fp;image.save(fp, nullptr, 100);label->setText("切割：" + comboBox->currentText() + " " + QString::number(i+1) + "/" + QString::number(n));}settings.setValue("Slice", lineEdit->text());} else {QMessageBox::critical(dialog, "错误", "份数不是数字");}});connect(pushButton_cancel, &QPushButton::clicked, [=]{dialog->close();});
}