update to the latest oatpp API.

Author: lganzzzo

src/backend/ImageWSListener.cpp

@@ -78,7 +78,7 @@ void ImageWSListener::readMessage(const WebSocket& socket, v_uint8 opcode, p_cha
   if(size == 0) { // message transfer finished
 
     auto wholeMessage = m_messageBuffer.toString();
-    m_messageBuffer.clear();
+    m_messageBuffer.setCurrentPosition(0);
     OATPP_LOGD(TAG, "onMessage message='%s'", wholeMessage->c_str());
 
   } else if(size > 0) { // message frame received

src/backend/ImageWSListener.hpp

@@ -39,7 +39,7 @@ class ImageWSListener : public oatpp::websocket::WebSocket::Listener {
   /**
    * Buffer for messages. Needed for multi-frame messages.
    */
-  oatpp::data::stream::ChunkedBuffer m_messageBuffer;
+  oatpp::data::stream::BufferOutputStream m_messageBuffer;
 
  private: