C / C++ / MFC

int nWidth = 3;<br />
ExtCreatePen(..., PS_DOT, ..., nWidth, ...);

<br />
class MyClass<br />
{<br />
public:<br />
   void MyFunc(void);<br />
};<br />
<br />
<br />
void __cdecl worker(void *pVar)<br />
{<br />
   ((MyClass*)pVar)->MyFunc();<br />
}<br />
<br />
// lets take the constructo for example<br />
MyClass::MyClass()<br />
{<br />
   // this would allow an external function to execute 'MyFunc', since you<br />
   // pass it a pointer to this<br />
   worker(this);<br />
}<br />
<br />
<br />

void (*m_pNotifyDataAvailablity)();
 
class CMyClass
{
public:
    CMyClass(){};
    ~CMyClass(){};
 
    void SetCallback(void(*p_pNotifyDataAvailablityCallback)(void));
    static void SomeCallback( void );
};
 
void CMyClass::SetCallback(void(*p_pNotifyDataAvailablityCallback)(void))
{
    m_pNotifyDataAvailablity = p_pNotifyDataAvailablityCallback;
}
 
void CMyClass::SomeCallback( void )
{
    AfxMessageBox("Howdy!");
}
 
...
 
CMyClass mc;
mc.SetCallback(CMyClass::SomeCallback);