c++ ANSI、UNICODE、UTF8互转

转载自：http://www.cppblog.com/Tongy0/archive/2013/03/13/198378.html

    static std::wstring MBytesToWString(const char* lpcszString);
    static std::string WStringToMBytes(const wchar_t* lpwcszWString);
    static std::wstring UTF8ToWString(const char* lpcszString);
    static std::string WStringToUTF8(const wchar_t* lpwcszWString);

std::wstring KKLogObject::MBytesToWString(const char* lpcszString)
{
    int len = strlen(lpcszString);
    int unicodeLen = ::MultiByteToWideChar(CP_ACP, 0, lpcszString, -1, NULL, 0);
    wchar_t* pUnicode = new wchar_t[unicodeLen + 1];
    memset(pUnicode, 0, (unicodeLen + 1) * sizeof(wchar_t));
    ::MultiByteToWideChar(CP_ACP, 0, lpcszString, -1, (LPWSTR)pUnicode, unicodeLen);
    wstring wString = (wchar_t*)pUnicode;
    delete [] pUnicode;
    return wString;
}

std::string KKLogObject::WStringToMBytes(const wchar_t* lpwcszWString)
{
    char* pElementText;
    int iTextLen;
    // wide char to multi char
    iTextLen = ::WideCharToMultiByte(CP_ACP, 0, lpwcszWString, -1, NULL, 0, NULL, NULL);
    pElementText = new char[iTextLen + 1];
    memset((void*)pElementText, 0, (iTextLen + 1) * sizeof(char));
    ::WideCharToMultiByte(CP_ACP, 0, lpwcszWString, 0, pElementText, iTextLen, NULL, NULL);
    std::string strReturn(pElementText);
    delete [] pElementText;
    return strReturn;
}

std::wstring KKLogObject::UTF8ToWString(const char* lpcszString)
{
    int len = strlen(lpcszString);
    int unicodeLen = ::MultiByteToWideChar(CP_UTF8, 0, lpcszString, -1, NULL, 0);
    wchar_t* pUnicode;
    pUnicode = new wchar_t[unicodeLen + 1];
    memset((void*)pUnicode, 0, (unicodeLen + 1) * sizeof(wchar_t));
    ::MultiByteToWideChar(CP_UTF8, 0, lpcszString, -1, (LPWSTR)pUnicode, unicodeLen);
    wstring wstrReturn(pUnicode);
    delete [] pUnicode;
    return wstrReturn;
}

std::string KKLogObject::WStringToUTF8(const wchar_t* lpwcszWString)
{
    char* pElementText;
    int iTextLen = ::WideCharToMultiByte(CP_UTF8, 0, (LPWSTR)lpwcszWString, -1, NULL, 0, NULL, NULL);
    pElementText = new char[iTextLen + 1];
    memset((void*)pElementText, 0, (iTextLen + 1) * sizeof(char));
    ::WideCharToMultiByte(CP_UTF8, 0, (LPWSTR)lpwcszWString, -1, pElementText, iTextLen, NULL, NULL);
    std::string strReturn(pElementText);
    delete [] pElementText;
    return strReturn;
}