utf8-ansi.cpp

用C++编写的能将UTF8码转化成ANSC 码的源代码

//首先从UTF8转到UNCODE
//再从UNCODE转到ANSI

int ConvUtf8ToAnsi(CString& strSource, CString& strChAnsi)
{   
    if (strSource.GetLength() <= 0)
        return 0;
    
    CString strWChUnicode;

    strSource.TrimLeft();
    strSource.TrimRight();    
    strChAnsi.Empty();

    int iLenByWChNeed = MultiByteToWideChar(CP_UTF8, 0, 
                                            strSource.GetBuffer(0), 
                                            strSource.GetLength(), //MultiByteToWideChar
                                            NULL, 0);

    int iLenByWchDone = MultiByteToWideChar(CP_UTF8, 0, 
                                            strSource.GetBuffer(0), 
                                            strSource.GetLength(), 
                                            (LPWSTR)strWChUnicode.GetBuffer(iLenByWChNeed * 2), 
                                            iLenByWChNeed); //MultiByteToWideChar
    
    strWChUnicode.ReleaseBuffer(iLenByWchDone * 2);

    int iLenByChNeed  = WideCharToMultiByte(CP_ACP, 0, 
                                            (LPCWSTR)strWChUnicode.GetBuffer(0),
                                            iLenByWchDone,
                                            NULL, 0, 
                                            NULL, NULL);  
    
    int iLenByChDone  = WideCharToMultiByte(CP_ACP, 0, 
                                            (LPCWSTR)strWChUnicode.GetBuffer(0), 
                                            iLenByWchDone,
                                            strChAnsi.GetBuffer(iLenByChNeed), 
                                            iLenByChNeed, 
                                            NULL, NULL);

    strChAnsi.ReleaseBuffer(iLenByChDone);
    
    if (iLenByWChNeed != iLenByWchDone || iLenByChNeed != iLenByChDone)
        return 1;

    return 0;    
}