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class MyDialog : public QDialog {
public :
MyDialog(QWidget * parent=nullptr);
public slots:
void setCnt(const QString &inCnt) {
cnt = inCnt;
showByCnt();
}
private slots:
void showByCnt(); //根据cnt做一些展示
private :
QString cnt;
};
//在你的主窗口
void MainWindow::on_pushButton_clicked()
{
query q;
q.setCnt(ui->lineEdit->text());
q.exec();
}