VC中支持中文的字符串比较函数

WCHAR * mbcsToUnicode(const char *zStr)
{
    int nByte;
    WCHAR *zMbcsStr;
    int codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
    nByte = MultiByteToWideChar(codepage, 0, zStr, -1, NULL,0)*sizeof(WCHAR);
    zMbcsStr = (WCHAR*)malloc( nByte*sizeof(zMbcsStr[0]) );
    if( zMbcsStr==0 )
        {
        return 0;
    }
    nByte = MultiByteToWideChar(codepage, 0, zStr, -1, zMbcsStr, nByte);
    if( nByte==0 )
        {
        free(zMbcsStr);
        zMbcsStr = 0;
    }
    return zMbcsStr;
}

BOOL CompareStr(CStringA S1, CStringA S2)
{
    WCHAR* wa;
    WCHAR* wb;
    wa = mbcsToUnicode(S1.GetBuffer());
    wb = mbcsToUnicode(S2.GetBuffer());
    return CompareStringW(LOCALE_USER_DEFAULT, NORM_IGNORECASE, (LPCWSTR)wa, wcslen(wa), (LPCWSTR)wb, wcslen(wb)) - CSTR_EQUAL == 1;
}