C++类继承:子类调用父类的构造函数

父类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();

};

构造函数有两个参数,host和port , 子类BmsNetUtil继承它, 并将host/port封装在里面, 主程序调用BmsNetUtil时无需再指定host/port参数 , 这时应该这样写:

#pragma once

#include <windows.h>
#include <string>
#include "HttpUtil.h"
using namespace std;

class BmsNetUtil :public HttpUtil
{
protected:	
public:
	BmsNetUtil();
    ~BmsNetUtil();
	bool login();
};

BmsNetUtil 构造函数的实现:

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

在构造函数后面加上:父类的构造语句就可以了...