Getting parent dialog variable value in child dialog

subrat17june

I have a parent dialog. and i am launching a child dialog from within the parent dialog. code below

// inside parent dialog
QString pValue;
ChildDialog = new ChildDialog(this);
ChildDialog->exex();

// inside child dialog
QString cValue = need to get the value of pValue declared in parent dialog.

i want to pass the value of a QString value from the parent dialog to child dialog..
how can i access the QString value in my ChildDialog???
how can i pass/ access the value from the parent dialog ??

Thanks.

podsvirov

You can pass the value in the constructor:
@
class ChildDialog: public QDialog
{
QString cValue;
public:
ChildDialog(const QString value, QWidget *parent = 0) :
QDialog(parent), cValue(value)
{
// Now cValue == value
// You can use cValue from other methods of ChildDialog
}
}
@

subrat17june

Thanks for the reply.

do i need to make changes in header as well an in cpp file..

// in header
class ChildDialog : public QDialog
{
Q_OBJETC
public:
QString path;
explicit ChildDialog(const QString value, QWidget *parent = 0) : QDialog(parent), path(value){}
~ChildDialog();

//in cpp file
ChildDialg::ChildDialog(QWidget *parent) : QDialog(parent), ui(new Ui::ChildDialog)
{
ui->SetupUi(this);
}

Showing error, prototype for ChildDialog::ChildDialog(QWidget*) does not match any in class ChildIDialog

where have i written wrong??

podsvirov

Ok.
I brought all the code in one place for short.
You can put up the implementation of the constructor in the source file.

Header ChildDialog (.h or .hpp):
@
class ChildDialog: public QDialog
{
QString cValue;
public:
ChildDialog(const QString value, QWidget *parent = 0);
void childMethod();
}
@

Source ChildDialog (.cpp):
@
ChildDialog::ChildDialog(const QString value, QWidget *parent) :
QDialog(parent), cValue(value)
{
ui->setupUi(this);
// Use cValue or call other method
childMethod();
}
}
void ChildDialog::childMethod()
{
// Use cValue
}
@

In parent dialog implementation:
@
QString pValue = "Hello from parent";
ChildDialog = new ChildDialog(pValue, this);
ChildDialog->exec();
@

subrat17june

i changed it..
// in header
@
public:
QString fPath
explicit ChildDialog(const QString value, QWidget *parent = 0) ;
@

// in source dialog
@ ChildDialg::ChildDialog(QString value,QWidget *parent) : QDialog(parent),fPath(value) ui(new Ui::ChildDialog)
{
}@

now i am getting the error
multiple definition of ChildDialog::ChildDialog(QString,QWidget*)
using the statements below to launch the ChildDialog in my maindialog
@ QString pValue;
ChildDialog = new ChildDialog(pValue,this);
ChildDialog->exex();@

what went wrong ??

Thank You

subrat17june

Thanks Konstantin
but why is the error coming for multiple definition ??

Thanks

podsvirov

You are using preprocessor directives in header files?

Header ChildDialog (.h or .hpp):
@
#ifndef CHILD_DIALOG_H
#define CHILD_DIALOG_H

// Header code...

#endif // CHILD_DIALOG_H
@