C++类继承之子类调用父类的构造函数的实例详解 父类HttpUtil: #pragma once #include windows.h #include string using namespace std; class HttpUtil { private: LPVOID hInternet; LPVOID hConnect; LPVOID hRequest; protected: wc
C++类继承之子类调用父类的构造函数的实例详解
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...
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