Error Trying to take out a qlist from a binary file

[sonulohani]

You have to provide the definition of the datatype car, then only we will get to know about the main problem.

[bmn]

I already do that but I don't why is keeping doing the same error when i tried to read te binary file

[stampede]

Why are you using a reference to a pointer as second argument to operator >> ? This is how such method looks like most of the time:

QDataStream & operator>>(QDataStream & in, MyClass & obj){
   ...
   return in;
}

QDataStream & operator>>(QDataStream & in, MyClass & obj){
   ...
   return in;
}

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What kind of error do you get ? Is your pointer null ?

[bmn]

It doesn't even run, when my program starts is looking for the file and found it but when i tries do put the qlist inside my instance of qlist don't work
here is the code where I read

QFile read("register.txt");
   if(read.exists()){
       if (read.open(QIODevice::ReadOnly)){;
           QDataStream in(&read);
           in.setVersion(QDataStream::Qt_4_6);
           in >> cars;
           read.close();
        }
    }

QFile read("register.txt");
   if(read.exists()){
       if (read.open(QIODevice::ReadOnly)){;
           QDataStream in(&read);
           in.setVersion(QDataStream::Qt_4_6);
           in >> cars;
           read.close();
        }
    }

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cars is my list in the main (QList<car> cars)

[d_stranz]

this is my qlist: car *&list

This is not a QList<car>. It isn't even a QList< car * >. It is a reference to a pointer to a "car" instance. So calling "in >> cars" can't possibly call this method if "cars" is actually a QList<car>, because the QDataStream operator you have defined doesn't match the required function signature.

So what does your code really look like? What you have posted isn't complete enough.