Question

I am communicating with a web server using my Qt application. I’am getting the response which contains a list of strings. So i’am storing the response into a QStringList. I have to display those string values in another form. How can i pass this list to another form.

Answer 1

Since QStringList (effectively QList<QString>) is part of Qt’s generic containers family, it uses implicit sharing. This means that if you pass-by-value, you’ll only perform a shallow copy, which is to say that you’ll effectively only be passing the thin book-keeping part of the data structure – a pointer to a larger block of data which exists elsewhere. This block of data only needs to exist in one place (on the heap) but can be referenced by multiple QLists.

Do something like:

void Foo::Pass()
{
  QStringList List;
  //fill list
  mCatch->Catch(List);
}

void Bar::Catch(QStringList List)
{
  //use list
}