C++類繼承之子類調(diào)用父類的構(gòu)造函數(shù)的實(shí)例詳解
父類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(); }; 構(gòu)造函數(shù)有兩個(gè)參數(shù),host和port , 子類BmsNetUtil繼承它, 并將host/port封裝在里面, 主程序調(diào)用BmsNetUtil時(shí)無(wú)需再指定host/port參數(shù) , 這時(shí)應(yīng)該這樣寫:
#pragma once #include <windows.h> #include <string> #include "HttpUtil.h" using namespace std; class BmsNetUtil :public HttpUtil { protected: public: BmsNetUtil(); ~BmsNetUtil(); bool login(); }; BmsNetUtil 構(gòu)造函數(shù)的實(shí)現(xiàn):
BmsNetUtil::BmsNetUtil():HttpUtil(TEXT(C_SITE),C_PORT) { ..... } 在構(gòu)造函數(shù)后面加上:父類的構(gòu)造語(yǔ)句就可以了...
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