init

Masterarbeit/openvibe/extras-master/applications/examples/external-stimulation-connection/include/openvibeStimulationConnection.h

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <sys/timeb.h>
+#include <boost/interprocess/ipc/message_queue.hpp>
+
+#include <iostream> // log
+#include <utility>
+
+namespace OpenViBE {
+class CStimulationConnection
+{
+public:
+	/**
+	 * Create a new OpenvibeStimulationConnection object.
+	 *
+	 * Initiates the message queue.
+	 *
+	 * @param queueName The name of the queue.
+	 * @throw boost::interprocess::interprocess_exception Throws an
+	 * interprocess exception in the queue fails to be created.
+	 */
+	explicit CStimulationConnection(std::string queueName = "openvibeExternalStimulations")
+		: m_messageQueueName(std::move(queueName))
+	{
+		boost::interprocess::message_queue::remove(m_messageQueueName.c_str());
+
+		try
+		{
+			m_messageQueue = new boost::interprocess::message_queue(boost::interprocess::create_only, m_messageQueueName.c_str(), m_maxMessages,
+																	m_chunkLength * sizeof(uint64_t));
+		}
+		catch (boost::interprocess::interprocess_exception& exception)
+		{
+			std::cout << exception.what() << std::endl; // log
+			throw;
+		}
+	}
+
+	/**
+	 * Send a stimulation to the OpenViBE Acquisition server on the initiated
+	 * queue.
+	 *
+	 * @throw boost::interprocess::interprocess_exception Throws an exception
+	 * if the message sending failed.
+	 */
+	void sendStimulation(const uint64_t stimulationID) const
+	{
+		struct timeb currentTime;
+
+		ftime(&currentTime);
+
+		const uint64_t stimulationTime = currentTime.time * 1000 + currentTime.millitm;
+		uint64_t message[3];
+
+		message[0] = 0; // unused at the moment
+		message[1] = stimulationID;
+		message[2] = stimulationTime;
+
+		try { m_messageQueue->send(&message, sizeof(message), 0); }
+		catch (boost::interprocess::interprocess_exception& exception)
+		{
+			std::cout << exception.what() << std::endl; // log
+			throw;
+		}
+	}
+
+protected:
+	std::string m_messageQueueName;
+	int m_chunkLength = 3;
+	int m_maxMessages = 5000;
+
+	// openvibe currently uses messages of length of 3
+	boost::interprocess::message_queue* m_messageQueue = nullptr;
+};
+}	// namespace OpenViBE