structures and classes

[OzQTNoob]

I was wanting to know if it is considered bad practice to declare a structure in my class? a snippet of the class definition below,

#ifndef READHEADER_H
#define READHEADER_H
 
#include <QObject>
...
 
struct headerInfo{
    int numberOfSamples;
    int numberOfLines;
    int numberOfBands;
    int dataType;
    QString fileName;
    QVector<double> wavelengths;
};
 
class readHeader : public QObject
{
    Q_OBJECT
public:
    explicit readHeader(QObject *parent = 0);
    headerInfo getHeaderInfo();
...
private:
...
signals:
...    
public slots:
 
private:
...
    headerInfo p_hdrinfo;
};
 
#endif // READHEADER_H

#ifndef READHEADER_H
#define READHEADER_H

#include <QObject>
...

struct headerInfo{
    int numberOfSamples;
    int numberOfLines;
    int numberOfBands;
    int dataType;
    QString fileName;
    QVector<double> wavelengths;
};

class readHeader : public QObject
{
    Q_OBJECT
public:
    explicit readHeader(QObject *parent = 0);
    headerInfo getHeaderInfo();
...
private:
...
signals:
...    
public slots:

private:
...
    headerInfo p_hdrinfo;
};

#endif // READHEADER_H

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So in my main program when include my readheader.h I can of course access the structure directly, but instead I use the getheaderinfo function which returns the structure(i don't really know what my reasoning behind that was). This code/class will never be distributed to anyone and any code that does use it will be writing. I am aware that the way I have done it also allows the structure contents to be changed anywhere in my code. Doesn't feel right.
I should also say that the header file contains various information in various formats e.g. int, double, string and some vectors.
I cant help but feel that this is not the right thing to do and is most likely considered really bad practice. I am still very new to C++ and Qt. I did initially have a ton of getter public functions in my class but wanted to return everything at once rather than making umpteen million calls.

Any help/advice on such things would be really appreciated.

Cheers
Oz