C++ String::size方法代码示例

void RedirectHomeToTempIfAppropriate()
{
    #if !defined(DISABLE_HOME_DIR_REDIRECT) 
        //Set $HOME to tmp on unix systems
        std::stringstream tempDir; //( P_tmpdir );
        tempDir << P_tmpdir;
        Aws::String dir = tempDir.str().c_str();
        if (dir.size() > 0 && *(dir.c_str() + dir.size() - 1) != Aws::FileSystem::PATH_DELIM)
        {
            tempDir << Aws::FileSystem::PATH_DELIM;
        }
        Aws::Environment::SetEnv("HOME", tempDir.str().c_str(), 1);
    #endif // !defined(DISABLE_HOME_DIR_REDIRECT)
}

QueryStringParameterCollection URI::GetQueryStringParameters(bool decode) const
{
    Aws::String queryString = GetQueryString();

    QueryStringParameterCollection parameterCollection;

    //if we actually have a query string
    if (queryString.size() > 0)
    {
        size_t currentPos = 1, locationOfNextDelimiter = 1;

        //while we have params left to parse
        while (currentPos < queryString.size())
        {
            //find next key/value pair
            locationOfNextDelimiter = queryString.find('&', currentPos);

            Aws::String keyValuePair;

            //if this isn't the last parameter
            if (locationOfNextDelimiter != Aws::String::npos)
            {
                keyValuePair = queryString.substr(currentPos, locationOfNextDelimiter - currentPos);
            }
            //if it is the last parameter
            else
            {
                keyValuePair = queryString.substr(currentPos);
            }

            //split on =
            size_t locationOfEquals = keyValuePair.find('=');
            Aws::String key = keyValuePair.substr(0, locationOfEquals);
            Aws::String value = keyValuePair.substr(locationOfEquals + 1);

            if(decode)
            {
                parameterCollection[StringUtils::URLDecode(key.c_str())] = StringUtils::URLDecode(value.c_str());
            }
            else
            {
                parameterCollection[key] = value;
            }
            currentPos += keyValuePair.size() + 1;
        }
    }

    return parameterCollection;
}

SimpleStreamBuf::SimpleStreamBuf(const Aws::String& value) :
    m_buffer(nullptr),
    m_bufferSize(0)
{
    size_t baseSize = (std::max)(value.size(), static_cast<std::size_t>(DEFAULT_BUFFER_SIZE));

    m_buffer = Aws::NewArray<char>(baseSize, SIMPLE_STREAMBUF_ALLOCATION_TAG);
    m_bufferSize = baseSize;

    std::memcpy(m_buffer, value.c_str(), value.size());

    char* begin = m_buffer;
    char* end = begin + m_bufferSize;

    setp(begin + value.size(), end);
    setg(begin, begin, begin);
}

void SimpleStreamBuf::str(const Aws::String& value)
{
    char* begin = m_buffer;
    char* end = begin + m_bufferSize;

    setp(begin, end);
    setg(begin, begin, begin);

    xsputn(value.c_str(), value.size());
}

bool CreateDirectoryIfNotExists(const char* path, bool createParentDirs)
{
    Aws::String directoryName = path;
    AWS_LOGSTREAM_INFO(FILE_SYSTEM_UTILS_LOG_TAG, "Creating directory " << directoryName);

    // Create intermediate directories or create the target directory once.
    for (size_t i = createParentDirs ? 0 : directoryName.size() - 1; i < directoryName.size(); i++)
    {
        // Create the intermediate directory if we find a delimiter and the delimiter is not the first char, or if this is the target directory.
        if (i != 0 && (directoryName[i] == FileSystem::PATH_DELIM || i == directoryName.size() - 1))
        {
            // the last delimeter can be removed safely.
            if (directoryName[i] == FileSystem::PATH_DELIM) 
            {
                directoryName[i] = '\0';
            }
            if (CreateDirectoryW(ToLongPath(StringUtils::ToWString(directoryName.c_str())).c_str(), nullptr))
            {
                AWS_LOGSTREAM_DEBUG(FILE_SYSTEM_UTILS_LOG_TAG, "Creation of directory " << directoryName.c_str() << " succeeded.");
            }
            else
            {
                DWORD errorCode = GetLastError();
                if (errorCode != ERROR_ALREADY_EXISTS && errorCode != NO_ERROR) // in vs2013 the errorCode is NO_ERROR
                {
                    AWS_LOGSTREAM_ERROR(FILE_SYSTEM_UTILS_LOG_TAG, " Creation of directory " << directoryName.c_str() << " returned code: " << errorCode);
                    return false;
                }
                AWS_LOGSTREAM_DEBUG(FILE_SYSTEM_UTILS_LOG_TAG, " Creation of directory " << directoryName.c_str() << " returned code: " << errorCode);
            }
            // Restore the path. We are good even if we didn't change that char to '\0', because we are ready to return.
            directoryName[i] = FileSystem::PATH_DELIM;
        }
    }
    return true;
}

Aws::Vector<Aws::String> StringUtils::SplitOnLine(const Aws::String& toSplit)
{
    Aws::StringStream input(toSplit);
    Aws::Vector<Aws::String> returnValues;
    Aws::String item;

    while (std::getline(input, item))
    {
        if (item.size() > 0)
        {
            returnValues.push_back(item);
        }
    }

    return std::move(returnValues);
}

Aws::String GetHomeDirectory()
{
    static const char* HOME_DIR_ENV_VAR = "USERPROFILE";

    AWS_LOGSTREAM_TRACE(FILE_SYSTEM_UTILS_LOG_TAG, "Checking " << HOME_DIR_ENV_VAR << " for the home directory.");
    Aws::String homeDir = Aws::Environment::GetEnv(HOME_DIR_ENV_VAR);
    AWS_LOGSTREAM_DEBUG(FILE_SYSTEM_UTILS_LOG_TAG, "Environment value for variable " << HOME_DIR_ENV_VAR << " is " << homeDir);
    if(homeDir.empty())
    {
        AWS_LOGSTREAM_WARN(FILE_SYSTEM_UTILS_LOG_TAG, "Home dir not stored in environment, trying to fetch manually from the OS.");
        HANDLE hToken;
    
        if (OpenProcessToken(GetCurrentProcess(), TOKEN_READ, &hToken))
        {
            DWORD len = MAX_PATH;
            WCHAR path[MAX_PATH];
            if (GetUserProfileDirectoryW(hToken, path, &len))
            {                
                homeDir = Aws::Utils::StringUtils::FromWString(path);
            }
            CloseHandle(hToken);
        }        

        AWS_LOGSTREAM_INFO(FILE_SYSTEM_UTILS_LOG_TAG, "Pulled " << homeDir << " as home directory from the OS.");
    }

    Aws::String retVal = (homeDir.size() > 0) ? Aws::Utils::StringUtils::Trim(homeDir.c_str()) : "";

    if (!retVal.empty())
    {
        if (retVal.at(retVal.length() - 1) != Aws::FileSystem::PATH_DELIM)
        {
            retVal += Aws::FileSystem::PATH_DELIM;
        }
    }
    
    return retVal;
}

XmlDocument XmlDocument::CreateFromXmlString(const Aws::String& xmlText)
{
    XmlDocument xmlDocument;
    xmlDocument.m_doc->Parse(xmlText.c_str(), xmlText.size());
    return xmlDocument;
}