Using large data structure for storage!

Kushan

In my qt c++ I am Using QList<QStringList> data structure to store a set of lists! But when I try to put a large number of QStringLists(each QStringList is also bit large in size) such as 100 it give a run time error! What is the best solution for this?

jsulm

@Kushan What is the runtime error?
How big are all these strings together?
How do you add the strings to the list (can you show the code)?

Kushan

@jsulm Single QStringList is created and an index values is incremented and fed into a QList<QStringList>

jsulm

@Kushan Sorry, but this does not answer any of my questions!
If you want to get a solution you should provide enough information.
So:

What runtime error do you get?
How big are all these strings together?
How exactly do you add strings to the list (please show your code)?

Kushan

@jsulm Code is extremely complex bro! I doubt using QVector instead of QList will solve my size issue

jsulm

@Kushan I don't ask for the whole project. You should at least be able to say what the runtime error is and how big all those strings are. Did you try to debug your app to see where exactly it crashes?
Seriously, you really expect to get a solution without providing any information?

Kushan

@jsulm
1)the error is "This application has requested runtime to terminate it in an unusual way!"
2)I will give part of a code-
QList<QStringList> sample;

QStringList List;

List="Testing";

for(int i=0;i<number;i++){
sample<<List;
}

Here number refers to the value entered through line edit(i.e 100 in my scenario)

jsulm

@Kushan This code isn't going to compile as "List="Testing";" is invalid.
Would be nice if you would post part of your real code or at least a sample code which you tested and verified that it is crashing.
Did you try to debug your app to see where exactly it is crashing? This is first thing to do in such a situation.

Kushan

@jsulm

Sorry I made a mistake(The above mentioned error still exists;) the code is

QList<QStringList> sample;
QString Test="Testing";
QStringList List;

for(int i=0;i<number;i++){
List<<Test;
}

for(int i=0;i<number;i++){
sample<<List;
}

jsulm

@Kushan I tested this code: it does not crash (and I don't see why it should).
As I said you should first debug to see where it actually crashes.
And you still did not say how big your strings are. If they are huge then maybe your app gets out of memory and is terminated by the OS.

Kushan

@jsulm No this is just a sample the actual QString is very long :(

jsulm

@Kushan How long?

Kushan

@jsulm actually
QString Test="New,0,0,Instrument1,Order,Buy,100,Amend, Quote"

jsulm

@Kushan That's not long.
Please debug you app to see where it is crashing. I'm out of ideas as the code you posted doesn't crash and there is not enough information to tell you why your app is crashing.

Kushan

@jsulm Thanx alot how to use the debug?

jsulm

@Kushan Take a look at http://doc.qt.io/qtcreator/creator-debugging-example.html
and http://doc.qt.io/qtcreator/creator-debugging.html

Kushan

@jsulm Thanx for sparing your time

jsulm

@Kushan No problem

Kushan

@jsulm Actually the error is indexout of bound but I havent declared any size anywhere in my code for all the structures I have used!

jsulm

@Kushan Are you accessing list elements using [] anywhere in your code like

QList<QString> list;
qDebug() <<list[0];

?