Qt -how to get variable value from another function in same file

Question

New to Qt. Still learning it. I have clone.ui, clone.h and clone.cpp. clone ui has 2 buttons.

Browse button-> to Selection a destination path
Add button -> Clone(copy) a file

Clone.h

QString destination_path;
QFileDialog *fdialog;

Clone.cpp has

   QFileInfo finfo; // Declare outside function to increase scope
   QString destination_name; 

void Clone:: on_pushButton__Browse_clicked()
{  
  /*get the destination path in QString using QFileDialog 
    Got destination_path */

      QString destinatino_path = QFileDialog::getExistingDirectory(....);
      QFile finfo(destination_path);
     // QFileDialog  finfo(destionation_path)  

 }`

In the same file Clone.cpp

    void Clone:: on_btn_Add_clicked()
   { 
      // how to get the  same destination_path value here... 
      //using QFile or some other way?    

    }

I struck here, Am i missing anything? Any thoughts/suggestion highly useful.

getExistingDirectory returns a directory, and you want to copy a file, what is the file you want to copy? — eyllanesc
– eyllanesc, Commented Jun 17, 2018 at 19:47
want to copy executable file. Once got directory path, file path will be "directory path+ executable file" — Chandra
– Chandra, Commented Jun 18, 2018 at 3:43

Steve Lorimer · Accepted Answer · 2018-06-17 20:24:45Z

2

You've create a class (Clone) which has a data member QString destination_path.

Since it is a member variable it has class scope (as in you can access the same variable in any Clone:: member function for the same Clone object).

The problem is that you've hidden it by declaring another QString destination_path in Clone::on_pushButton__Browse_clicked().

void Clone::on_pushButton__Browse_clicked()
{  
    ...

    // this *hides* the class member with the same name
    QString destination_path = QFileDialog::getExistingDirectory(....); 

    ...
}

The solution is to remove QString from the beginning of the line, which means you are now assigning to the class object's data member.

void Clone::on_pushButton__Browse_clicked()
{  
    ...

    // now you're assigning to your object's data member
    destination_path = QFileDialog::getExistingDirectory(....); 

    ...
}

Later, in Clone::on_btn_Add_clicked() you can access destination_path, and it will have the value assigned to it in Clone::on_pushButton__Browse_clicked

answered Jun 17, 2018 at 20:24

Steve Lorimer

29k22 gold badges136 silver badges240 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Chandra Over a year ago

yes,correct. After removing QString , worked as expected :) Cheers!

Collectives™ on Stack Overflow

Qt -how to get variable value from another function in same file

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related