Seg fault QSqlRecord

[giusepped]

It seems that if I declare

model = new QSqlQueryModel(this);

model = new QSqlQueryModel(this);

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all works.
Which is the difference?

[Kumosan]

It seems that if I declare

model = new QSqlQueryModel(this);

model = new QSqlQueryModel(this);

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all works.
Which is the difference?

Outch, this happens when only a part of the code is posted. But what I do not understand is why your code compiles at all.

You do a

QSqlQueryModel  *model = new QSqlQueryModel(this);

QSqlQueryModel  *model = new QSqlQueryModel(this);

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in your constuctor? Don't know, this part is missing. However, your *model is a local variable, which has absolutely nothing to do with the model in updateDetails(...). Wonder what 'model' the compiler finds in updateDetails(...) at all. Or you have a model pointer as member variable. However, this is not the one you initialize in your constructor.

[spirit]

because you have a class member variable model and it was not initilazed.
in constructor you create a variable with the same name

...
QSqlQueryModel  *model = new QSqlQueryModel(this);
...

...
QSqlQueryModel  *model = new QSqlQueryModel(this);
...

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and when you try to access to methods in a model (it is still isn't initilazed) you get seg fault, because model variable has wrong pointer.

[giusepped]

Solved.Thank you.
In fact, in the header I defined

QSqlRecord *model;

QSqlRecord *model;

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That was the error.
step by step I am going to get accustomed to C++.
Bye