[C++, MFC] 형변환 연구

소스 코드를 GitHub로 옮김

#pragma once
 
#ifndef _TYPE_CASTER_H_
#define _TYPE_CASTER_H_
 
#include <Windows.h>
#include <iostream>
#include <string>
#include <vector>
#include <atlstr.h>
 
#define _ATL_CSTRING_EXPLICIT_CONSTRUCTORS
 
 
class KTypeCaster {
 
public:
 
    /*
    CString formating

    This code block
    {@code
        int num = 32
        CString strTemp;
        strTemp.Format(_T("I am the %d years old"), nYear);
        AfxMessageBox(strTemp);
    }

    can change to
    {@code
        int nYear = 32
        AfxMessageBox(CstFormat(_T("I am the %d years old"), nYear));
    }

    @see http://blog.daum.net/kwonjunsung/34
    */
 
    static CString CstFormat(const CString& strMsg, ...)
    {
        CString strRet;
        va_list valist;
 
        va_start(valist, strMsg);
        strRet.FormatV(strMsg, valist);
        va_end(valist);
 
        return strRet;
    }
 
    // CString <- std::string
    static CString ConvertString_StdStr2Cstr(const std::string src) {
        CString result = CA2CT(src.c_str());
        return result;
    }
 
    // CString <- std::string
    static CString ConvertString_StdStr2Cstr_2(const std::string src) {
        return CString(src.c_str());
    }
 
    /*
    // LPTSTR <- CString
     @see https://docs.microsoft.com/ko-kr/cpp/atl-mfc-shared/cstring-operations-relating-to-c-style-strings
    !!Need to delete when program exit!!
    */
    static void ConverString_Cstr2Lptstr(const CString src, LPTSTR *result) {
        int sizeOfString = src.GetLength() + 1;
        *result = new TCHAR[sizeOfString];
        _tcscpy_s(*result, sizeOfString, src);
    }
 
 
    /*
    std:wstring <- std::string
    */
    static std::wstring ConvertString_StdStr2StdWstr(const std::string src) {
        std::wstring result = CA2CT(src.c_str());
        return result;
    }
 
 
    /**
     std:wstring <- std::string

    {@code
        string = "COM3";
        wstring stemp;
        LPCWSTR result_port;
        stemp = s2ws(port_nr);
        result_port = stemp.c_str(); // now passing result_port to my function i am getting success
    }
    @see https://stackoverflow.com/a/22713047/7017299 (std::string -> LPCTSTR)

    */
    static std::wstring ConvertString_StdStr2StdWstr_2(const std::string &source)
    {
        int soureLength = (int)source.length() + 1;
        int len = MultiByteToWideChar(CP_ACP, 0, source.c_str(), soureLength, 0, 0);
        wchar_t* buf = new wchar_t[len];
        MultiByteToWideChar(CP_ACP, 0, source.c_str(), soureLength, buf, len);
        std::wstring r(buf);
        delete[] buf;
        return r;
    }
 
 
    /*
     std:wstring <- CString
    */
    static std::wstring ConvertString_Cstr2StdWstr(const CString src) {
        std::wstring result = src.operator LPCWSTR();
        return result;
    }
 
    //std::string <- std::wstring
    static std::string ConvertString_StdWstr2StdStr(const std::wstring src) {
        std::string result = CT2CA(src.c_str());
        return result;
    }
 
    //std::string <- CString
    static std::string ConvertString_Cstr2StdStr(const CString src) {
        std::string result = CT2CA(src.operator LPCWSTR());
        return result;
    }
 
    //std::string <- TCHAR *
    static std::string ConvertString_Tchar2StdStr(const TCHAR* ptsz)
    {
        CString result_cst(ptsz);
        return ConvertString_Cstr2StdStr(result_cst);
    }
 
 
#ifdef UNICODE
    static DWORD Convert_Cstr2Dword(CString src) {
        DWORD result = _ttol(src);
        return result;
    }
 
    static int Convert_Cstr2Int(CString src) {
        int result = _ttoi(src);
        return result;
    }
 
    static double Convert_Cstr2Double(CString src) {
        double result = _wtof(src);
        return result;
    }
#else
    static DWORD Convert_Cstr2Dword(CString src) {
        DWORD result = atol(src);
        return result;
    }
 
    static int Convert_Cstr2Int(CString src) {
        int result = atoi(src);
        return result;
    }
 
    static double Convert_Cstr2Double(CString src) {
        double result = atof(src);
        return result;
    }
 
#endif // !UNICODE
}

void CMyCustomDialogBaseDlg::OnBnClickedBtnTestConvert()
{
    //문자 집합(유니코드, 멀티바이트)이 다를 경우
    //사용해야 하는 함수가 다를 수 있음
    //For test in Visual studio 2017 (Unicode)
 
    CString cstr(_T("나는 CString"));
    std::string str("나는 string");
    std::wstring wstr(_T("나는 wstring"));
 
    CString cst_int = _T("141432");
    CString cst_double = _T("141432.55");
    DWORD dword = 314159; //DWORD 사이즈는 4byte (LONG으로 변환)
 
    int number = 119;
    double    double_num = 3.14159265358979;
 
 
    ///////////////////////////////////////////////////
    //To Cstring///////////////////////////////////////
 
    // CString <- std::string
    CString cstr2 = KTypeCaster::ConvertString_StdStr2Cstr(str);
    CString cstr3 = KTypeCaster::ConvertString_StdStr2Cstr_2(str);
 
    // CString <- std::wstring
    CString cstr4 = wstr.c_str();
 
    // CString <- int
    CString cstr5 = KTypeCaster::CstFormat(_T("Integer : %d"),number);
 
    // CString <- double
    CString cstr6 = KTypeCaster::CstFormat(_T("Double : %f"), double_num);
 
    /////////////////////////////////////////////////
 
 
    ///////////////////////////////////////////////////
    //LPTSTR <- CString////////////////////////////////
 
    CString cstr7 = _T("This is a test");
    LPTSTR lpTstr;
    KTypeCaster::ConverString_Cstr2Lptstr(cstr7, &lpTstr);
    delete lpTstr;
    ///////////////////////////////////////////////////
 
 
    //////////////////////////////////////////////////
    //To std::wstring/////////////////////////////////
 
    // std::wstring <- CString
    std::wstring wstr2 = KTypeCaster::ConvertString_Cstr2StdWstr(cstr);
    std::wstring wstr3 = cstr.GetBuffer(0);
 
    // std::wstring <- std::string
    std::wstring wstr4 = KTypeCaster::ConvertString_StdStr2StdWstr(str);
    std::wstring wstr5 = KTypeCaster::ConvertString_StdStr2StdWstr_2(str);    //std::string -> LPCTSTR
 
    /////////////////////////////////////////////////
 
 
 
    //////////////////////////////////////////////////
    //To std::string/////////////////////////////////
 
    // std::string <- CString
    std::string str2 = KTypeCaster::ConvertString_Cstr2StdStr(cstr);
 
    // std::string <- std::wstring
    std::string str3 = KTypeCaster::ConvertString_StdWstr2StdStr(wstr);
 
    /////////////////////////////////////////////////        
    
 
 
    //////////////////////////////////////////////////
    //To LPWSTR/////////////////////////////////
 
    // LPWSTR <- CString
    LPWSTR lpwstr = (LPWSTR)(LPCTSTR)cstr;
 
    /////////////////////////////////////////////////
 
 
     //////////////////////////////////////////////////
    //To const char* /////////////////////////////////
 
    /*
    const char* <- std::string
    @see http://www.techiedelight.com/convert-std-string-const-char-cpp/
    */
 
    // const char* <- std::string
    const char *c_char_1 = str.c_str();
    const char *c_char_2 = str.data();
 
    // const char* <- std::string (over C++11)
    const char *c_char_3 = &str[0];
    const char *c_char_4 = &*str.begin();
 
    // const char* <- CString
    const char *c_char_5 = (CStringA)cstr;
 
    /////////////////////////////////////////////////
 
 
     //////////////////////////////////////////////////
    //To DWORD //////////////////////////////////////
 
    // DWORD <- CString
    DWORD dword2 = KTypeCaster::Convert_Cstr2Dword(cst_int);    
 
    // CString <- DWORD
    CString cst_number2 = KTypeCaster::CstFormat(_T("%lu"), (ULONG)dword);
 
    /////////////////////////////////////////////////
 
 
 
    //////////////////////////////////////////////////
    //To integer/////////////////////////////////////
 
    // int <- CString
    int number_2 = KTypeCaster::Convert_Cstr2Int(cst_int);
 
 
    ////////////////////////////////////////////////
 
 
 
    //////////////////////////////////////////////////
    //To double/////////////////////////////////////
 
    // double <- CString
    double double_num_2 = KTypeCaster::Convert_Cstr2Double(cst_double);
 
 
    ////////////////////////////////////////////////
 
}

TCHAR는 가능하면 쓰지 말자...

http://lab.gamecodi.com/board/zboard.php?id=GAMECODILAB_QnA_etc&no=823

https://stackoverflow.com/q/37935460/7017299

참고사이트 : 

http://adnoctum.tistory.com/749

http://plming.tistory.com/63

http://easyprogramming.tistory.com/entry/이-한장으로-문자열-마스터

http://blog.naver.com/PostView.nhn?blogId=jtyworld&logNo=90043807453

http://www.dreamy.pe.kr/zbxe/CodeClip/29684