Qt中新实例化的组件未在插槽中检测到

Question

application in Qt 5.2.1. here is interface :-

Here is goto cell dialog header file :-

#ifndef GOTOCELLDIALOG_H
#define GOTOCELLDIALOG_H

#include <QDialog>
#include <QtWidgets>

namespace Ui {
class gotocellDialog;
}

class gotocellDialog : public QDialog
{
    Q_OBJECT

public:
explicit gotocellDialog(QWidget *parent = 0);
~gotocellDialog();

private slots:
void on_lineEditCellLocation_textChanged(const QString &arg1);

private:
    Ui::gotocellDialog *ui;
};

#endif // GOTOCELLDIALOG_H

and here is gotocell.cpp

#include "gotocelldialog.h"
#include "ui_gotocelldialog.h"

gotocellDialog::gotocellDialog(QWidget *parent) :
    QDialog(parent),
ui(new Ui::gotocellDialog)
{
     ui->setupUi(this);

     ui->pushButtonOK->setEnabled(false);
     QRegExp regexp("[A-Za-z][1-9][0-9]{0,2}");
     ui->lineEditCellLocation->setValidator(new QRegExpValidator(regexp, this));

 }

 gotocellDialog::~gotocellDialog()
 {
    delete ui;
 }

 void gotocellDialog::on_lineEditCellLocation_textChanged(const QString &arg1)
 {ui->pushButtonOK->setEnabled(ui->lineEditCellLocation->hasAcceptableInput());
 }

here another file mainwindow creating new gotocell object but unable to access its(gotocell's) component lineEditCellLocation

void spMainWindow::gotocell()
{
     gotocelldlg = new gotocellDialog(this);
     if(gotocelldlg->exec())
     {
          QString str = gotocelldlg->lineEditCellLocation->text.toUpper();
    spsheet->setCurrentCell(str.mid(1).toInt() - 1,
                                      str[0].unicode() - 'A');
     }
 }

here error is showing as :-

/opt/project/Qt/spreadsheet/spmainwindow.cpp:81: error: 'class  gotocellDialog' has no member named 'lineEditCellLocation'
 /opt/project/Qt/spreadsheet/spmainwindow.cpp:-1: In member function 'void spMainWindow::sort()':

here i want to access gotocelldialog's lineEditCellLocation but unable to get access.

Answer 1

I think, that this is just a small typo:

Replace the following line

QString str = gotocelldlg->lineEditCellLocation->text.toUpper();

with

QString str = ui->lineEditCellLocation->text.toUpper();

For your next posts you should include a minimal reproducible examples. This also includes the post of your ui file. Otherwise, it is very difficult for others to reproduce your problem.

Answer 2

finally i got its solution i did like this :-\\

 gotocelldlg = new gotocellDialog(this);
  if(gotocelldlg->exec())
  {
    QLineEdit *ledit = findChild<QLineEdit*>("lineEditCellLocation");

    QString str = ledit->text().toUpper();

    spsheet->setCurrentCell(str.mid(1).toInt() - 1,
                                      str[0].unicode() - 'A');
}