What is the difference between PeekMessage and GetMessage?

What is the difference between PeekMessage and GetMessage?

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.

Is GetMessage blocking?

According to here, GetMessage() is a blocking call which won’t return until there’s a message can be retrieved from the message queue.

What is GetMessage C++?

A handle to the window whose messages are to be retrieved. If hWnd is NULL, GetMessage retrieves messages for any window that belongs to the current thread, and any messages on the current thread’s message queue whose hwnd value is NULL (see the MSG structure).

What is Wm_quit?

Indicates a request to terminate an application, and is generated when the application calls the PostQuitMessage function. This message causes the GetMessage function to return zero. #define WM_QUIT 0x0012.

What is Dispatchmessage?

Dispatches a message to a window procedure. It is typically used to dispatch a message retrieved by the GetMessage function.

What is GetMessage in Java exception?

The getMessage() method of Throwable class is used to return a detailed message of the Throwable object which can also be null. One can use this method to get the detail message of exception as a string value.

What is GetMessage?

What is Lresult?

LRESULT is an integer value that your program returns to Windows. It contains your program’s response to a particular message. Additional data for the message is contained in the lParam and wParam parameters. Both parameters are integer values the size of a pointer width (32 bits or 64 bits).

What is the difference between GetMessage and PeekMessage?

Blocking, in this case, would mean that GetMessage will wait for a valid message to pop up into the message queue. PeekMessage will check the message queue and return the first message it finds. If there are no messages in the queue it will then return nothing.

How does PeekMessage work if HWND is -1?

If hWnd is -1, PeekMessage retrieves only messages on the current thread’s message queue whose hwnd value is NULL, that is, thread messages as posted by PostMessage (when the hWnd parameter is NULL) or PostThreadMessage. The value of the first message in the range of messages to be examined.

How do I get all available messages in GetMessage?

Use WM_INPUT here and in wMsgFilterMin to specify only the WM_INPUT messages. If wMsgFilterMin and wMsgFilterMax are both zero, GetMessage returns all available messages (that is, no range filtering is performed). If the function retrieves a message other than WM_QUIT, the return value is nonzero.

What is the PeekMessage loop used for?

Well the PeekMessage loop is generally used in video games, or applications that need to do things without the user sending a message, such as animation that isn’t used when the user does something. (Example: When sprites walk around every five seconds, such as in RPGs)