Question

How is it better to implement writing to QFile in reverse order, string by string.

With use of seek(0) new string is written over old one.

Answer 1

You should use a QStack of QString. Since it’s a LIFO (Last In First Out) container I think it’s what you are searching for.

Push each string as they come and then pop all strings:

QStack<QString> stack;
stack.push("first string");
stack.push("second string");
stack.push("third string");

while (!stack.isEmpty())
{
   QString string = stack.pop();
}

Edit: (new information in comments concerning the 2 files to write)

Use a Qvector to store all QString. Then in a for loop access first and last element to write them in each file. This can be done like this:

QVector<QString> vector;
vector.append("first string");
vector.append("second string");
vector.append("third string");

int size = vector.size();
for (int i=0; i<size; i++)
{
   QString string1 = vector[0]; // write it in one file
   Qstring string2 = vector[size-1-i]; // write it in another file
}

Hope that answers your question.