What are the differences between PeekMessage and GetMessage and when should each one of them be used?
The main difference between the two functions is that GetMessage does not return until a message matching the filter criteria is placed in the queue, whereas PeekMessage returns immediately regardless of whether a message is in the queue.
What is the difference between SendMessage and PostMessage?
postMessage: Sends a message in the message queue associated with the thread and returns without waiting for the thread to process that messaage. SendMessage: calls the window procedure for the specified window and does not return until the window procedure has processed the message.
What is message queuing system?
A message queue is a form of asynchronous service-to-service communication used in serverless and microservices architectures. Messages are stored on the queue until they are processed and deleted. Each message is processed only once, by a single consumer.
What is DispatchMessage?
What DispatchMessage() does is take the message, checks which window it is for and then looks up the Window Procedure for the window. It then calls that procedure, sending as parameters the handle of the window, the message, and wParam and lParam .
How are the messages processed in Windows?
Windows Messages The system passes input to a window procedure in the form of a message. Messages are generated by both the system and applications. The system generates a message at each input event—for example, when the user types, moves the mouse, or clicks a control such as a scroll bar.
What is message loop in Windows programming?
The message loop is an obligatory section of code in every program that uses a graphical user interface under Microsoft Windows. Windows programs that have a GUI are event-driven. Windows maintains an individual message queue for each thread that has created a window. This is the message loop.
What is MFC SendMessage?
The SendMessage function calls the window procedure for the specified window and does not return until the window procedure has processed the message. To post a message to a thread’s message queue and return immediately, use the PostMessage or PostThreadMessage function.
What is the best message queue?
Top 10 Message Queue (MQ) Software
- MuleSoft Anypoint Platform.
- IBM MQ.
- Azure Scheduler.
- Apache Kafka.
- TIBCO Rendezvous.
- Google Cloud Pub/Sub.
- Apache ActiveMQ.
What are the advantages of using message queuing system?
Message queues provide communication and coordination for these distributed applications. Message queues can significantly simplify coding of decoupled applications, while improving performance, reliability and scalability. You can also combine message queues with Pub/Sub messaging in a fanout design pattern.