字符集(编码)转换_Windows

ZC: 来自 我的项目 czgj

ZC: (1)、经过测试 MultiByteToWideChar(...) 返回的是 (需要的)WideChar[宽字符]的个数；(2)、WideCharToMultiByte 返回的是 (需要的)Char[窄字符]的个数 。

1、代码：

#include "TzEncodingWindows.h"

#ifdef BUILD_IN_WIN32
    #include <QDebug>

    #include <windows.h>
    #include <wchar.h>

    #include <string>
    #include <iostream>
    using namespace std;
#endif// BUILD_IN_WIN32

TzEncodingWindows::TzEncodingWindows()
{

}

TzEncodingWindows::~TzEncodingWindows()
{

}

#ifdef BUILD_IN_WIN32

//*
// ZC: 下面的代码来自网络：// http://www.cnblogs.com/lidabo/p/3903620.html

        // ZC: Ansi-->Unicode
        std::wstring MBytesToWString(const char* lpcszString)
        {
            //int len = strlen(lpcszString);
            int unicodeLen = ::MultiByteToWideChar(CP_ACP, , lpcszString, -, NULL, );
            wchar_t* pUnicode = new wchar_t[unicodeLen + ];
            memset(pUnicode, , (unicodeLen + ) * sizeof(wchar_t));
            ::MultiByteToWideChar(CP_ACP, , lpcszString, -, (LPWSTR)pUnicode, unicodeLen);
            wstring wString = (wchar_t*)pUnicode;
            delete [] pUnicode;
            return wString;
        }

        // ZC: Unicode-->Ansi
        std::string WStringToMBytes(const wchar_t* lpwcszWString)
        {
            char* pElementText;
            int iTextLen;
            // wide char to multi char
            iTextLen = ::WideCharToMultiByte(CP_ACP, , lpwcszWString, -, NULL, , NULL, NULL);
            pElementText = new char[iTextLen + ];
            memset((void*)pElementText, , (iTextLen + ) * sizeof(char));
            ::WideCharToMultiByte(CP_ACP, , lpwcszWString, , pElementText, iTextLen, NULL, NULL);
            std::string strReturn(pElementText);
            delete [] pElementText;
            return strReturn;
        }

        // ZC: Utf8-->Unicode
        std::wstring UTF8ToWString(const char* lpcszString)
        {
            //int len = strlen(lpcszString);
            int unicodeLen = ::MultiByteToWideChar(CP_UTF8, , lpcszString, -, NULL, );
            wchar_t* pUnicode;
            pUnicode = new wchar_t[unicodeLen + ];
            memset((void*)pUnicode, , (unicodeLen + ) * sizeof(wchar_t));
            ::MultiByteToWideChar(CP_UTF8, , lpcszString, -, (LPWSTR)pUnicode, unicodeLen);
            wstring wstrReturn(pUnicode);
            delete [] pUnicode;
            return wstrReturn;
        }

        // ZC: Unicode-->Utf8
        std::string WStringToUTF8(const wchar_t* lpwcszWString)
        {
            char* pElementText;
            int iTextLen = ::WideCharToMultiByte(CP_UTF8, , (LPWSTR)lpwcszWString, -, NULL, , NULL, NULL);
            pElementText = new char[iTextLen + ];
            memset((void*)pElementText, , (iTextLen + ) * sizeof(char));
            ::WideCharToMultiByte(CP_UTF8, , (LPWSTR)lpwcszWString, -, pElementText, iTextLen, NULL, NULL);
            std::string strReturn(pElementText);
            delete [] pElementText;
            return strReturn;
        }
//*/

void TzEncodingWindows::Test_Ansi2Utf8()
{

    qDebug() << "Hello : "+QString::number(sizeof(char));
//*
    char* lpcszString = "50路";
    //::MessageBoxA(0, lpcszString, "MessageBoxA - 1", 0);

    QString str = QString::fromUtf8(lpcszString);
    qDebug() << "lpcszString : "+QString::fromUtf8(lpcszString);
    qDebug() << "str.length() : "+ QString::number(str.length());

    QByteArray byteArr = str.toUtf8();
    qDebug() << "byteArr.length() : "+QString::number(byteArr.length());

    for (int i=; i<byteArr.length(); i++)
    {
        qDebug() << QString::number(i)+" : "+QString::number((int)byteArr.at(i), );
    }

    qDebug() << "strlen(lpcszString) : "+QString::number(strlen(lpcszString));

    int unicodeLen = ::MultiByteToWideChar(CP_UTF8, , lpcszString, -, NULL, );
    qDebug() << "unicodeLen : "+QString::number(unicodeLen);
    wchar_t* pUnicode;
    pUnicode = new wchar_t[unicodeLen + ];
    memset((void*)pUnicode, , (unicodeLen + ) * sizeof(wchar_t));
    ::MultiByteToWideChar(CP_UTF8, , lpcszString, -, (LPWSTR)pUnicode, unicodeLen);

    //::MessageBoxW(0, pUnicode, L"MessageBoxW", 0);
    wchar_t* lpwcszWString = pUnicode;
    ::MessageBoxW(, lpwcszWString, L"MessageBoxW", );

    int iTextLen = ::WideCharToMultiByte(CP_ACP, , lpwcszWString, -, NULL, , NULL, NULL);
    qDebug() << "iTextLen : "+QString::number(iTextLen);
    char* pElementText = new char[iTextLen + ];
    memset((void*)pElementText, , (iTextLen + ) * sizeof(char));
    int iRtn = ::WideCharToMultiByte(
                CP_ACP,
                ,
                lpwcszWString,
                unicodeLen,//0, // ZC: 网页中的这个值，设置的不正确，导致函数返回0，且GetLastError为ERROR_INVALID_PARAMETER。Fuck ！！！
                pElementText,
                iTextLen,
                NULL,
                NULL);
    // ERROR_INVALID_PARAMETER --> 87
    qDebug() << "WideCharToMultiByte return : "+QString::number(iRtn)+" -> GetLastError : "+QString::number(::GetLastError());
    ::MessageBoxA(, pElementText, "MessageBoxA", );

    for (int i=; i<iTextLen; i++)
    {
        qDebug() << QString::number(i)+" --> "+QString::number((int)pElementText[i], );
    }

    std::string strReturn(pElementText);

    qDebug() << "strReturn : " + QString::fromStdString(strReturn);

//    delete [] pUnicode;
//    delete [] pElementText;
//*/
}

#endif// BUILD_IN_WIN32

2、