An example of a constructor called by a subclass of the C++ class

An example of an C++ class subclass calling the constructor of a parent class

The parent class HttpUtil:

#pragma once 
 
#include <windows.h> 
#include <string> 
using namespace std; 
class HttpUtil 
{ 
private: 
  LPVOID hInternet; 
  LPVOID hConnect; 
  LPVOID hRequest; 
 
protected: 
 wchar_t * mHostName; 
 short mPort; 
 string sendRequest(WCHAR * pvHostName, short pvPort, WCHAR * pvUrl, WCHAR * pvMethod, char * pvPostData, int pvPostDataLen); 
 
public: 
  HttpUtil(wchar_t * pvHostName, short pvPort); 
  ~HttpUtil(); 
  void reset(); 
 
}; 

The constructor has two parameters,host and port. The subclass BmsNetUtil inherits it and encapsulates host/port inside. When the main program calls BmsNetUtil, it does not need to specify host/port.

#pragma once 
 
#include <windows.h> 
#include <string> 
#include "HttpUtil.h" 
using namespace std; 
 
class BmsNetUtil :public HttpUtil 
{ 
protected:  
public: 
  BmsNetUtil(); 
  ~BmsNetUtil(); 
  bool login(); 
}; 

Implementation of BmsNetUtil constructor:

BmsNetUtil::BmsNetUtil():HttpUtil(TEXT(C_SITE),C_PORT) 
{ ..... 
} 

After the constructor, add: parent class construction statement.

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