C++读取配置文件

/**
* 
* read config file, add <key,value> into map.
* @param filepath (in)line text
* @param return  
*        -1:error,invalid line
*        0:success
*           
*/
int INIReader::readFile(const wstring &filename) {
    std::string strFilename(filename.begin(), filename.end());
    wifstream infile(strFilename.c_str());
    wstring buffer;
    while (getline(infile, buffer)) {
        parseContentLine(buffer);
    }

    return 0;
}

/**
* 
* handle single line text,then add <key,value> into map.
* @param filepath (in)line text
* @param return  
*        -1:error,invalid line
*        0:success
*           
*/
int INIReader::parseContentLine(wstring &contentLine) {
    contentLine = trim(contentLine);
    if (contentLine.size() < 1) {
        return 0;   // blank line
    }

    if (contentLine.substr(0, 1) == ANNOTATION_SYMBOL1 
        || contentLine.substr(0, 1) == ANNOTATION_SYMBOL2) {
            return 0;   // comment
    }

    wstring::size_type equalPos = contentLine.find_first_of(L"=");
    wstring::size_type startPos = 0;
    wstring::size_type endPos = contentLine.size() - 1;

    if (equalPos <= startPos || equalPos > endPos) {
        return -1; // invalid line
    }

    wstring key = rtrim(contentLine.substr(startPos, equalPos ));
    wstring value = ltrim(contentLine.substr(equalPos + 1, endPos));

    paramMap.insert(std::make_pair(key, value));

    //std::wcout <<key <<"	" << value << std::endl;
    return 0;
}