从另一个对象访问一个对象的方法(有更好的方法吗?)

我想保留封装和抽象，但我真的有麻烦编辑这个。我用C写了这个程序，它可以工作，但是把它转换成面向对象对我来说真的很头疼。这个程序是一个。ini文件阅读器，格式如下:

[sections] keys = values

XKey::XKey(const char *k, const char *v)
{
    free(m_name);
    free(m_value);
    m_name = strdup(k);
    m_value = strdup(v);
    m_next = 0;
}
XKey *XSection::addKey(const char *k, const char *v)
{
    XKey *kn = new XKey(k, v);
    XKey *ks;
    if (m_keys == 0) {
        m_keys = kn;
        return kn;
    }
    ks = m_keys;
    while (ks->m_next)
        ks = ks->m_next;
    ks->m_next = kn;
    return kn;
}
XKey::~XKey()
{
}
XSection::XSection(const char *s)
{
   free(m_name);
   m_name = strdup(s);
   m_next = 0;
   m_keys = 0;
}
XSection *XIniFile::addSection(const char *d)
{
    XSection *sn = new XSection(d);
    XSection *ss;
    if (m_sections == 0) {
        m_sections = sn;
        return sn;
    }
    ss = m_sections;
    while(ss->m_next)
        ss = ss->m_next;
    ss->m_next = sn;
    return sn;
}
XSection::~XSection()
{
}
XIniFile::XIniFile()
{
    m_sections = 0;
    m_modified = FALSE;
}
int XIniFile::open(const char *fn)
{   
    //do some routines here to get string values for 
    //sn               <--section name
    //kn               <--key name
    //val               <--value name
    //do loop here to insert all the sections   
            cs = addSection(sn);
            //do loop here to add all the keys and values on every section 
            //then move to the next section    
                addKey(kn, val);    
    return 0;
}
XIniFile::~XIniFile()
{
}

这是我的。h文件的一个片段

class XKey
{
    friend class XSection;
    friend class XIniFile;
public:
    XKey(const char *, const char *);
    virtual ~XKey();
private:
    char *m_name;
    char *m_value;
    XKey *m_next;
};
class XSection
{
    friend class XIniFile;
public:
    XSection(const char *);
    XKey *addKey(const char *, const char *);
    virtual ~XSection();   
private:    
    char *m_name;
    XKey *m_keys;
    XSection *m_next;
};
class XIniFile
{
private:
    char *m_name;
    XSection *m_sections;
    int m_modified;
    XSection *addSection(const char *);
public:
    XIniFile();
    virtual ~XIniFile();
};

我希望你能理解我正在做的程序。基本上我只是把它们存储在一个链表中。

我有这个错误addKey was not declared in this scope的问题，所以我想我的方法不是很好。