Answer / girish tryambake

The major difference between the two is that GetMessage()
doesn't return until it finds a message to retrieve from the
Application Queue, this allows us to free up precious CPU
usage for other programs to use. PeekMessage() returns
immediately weather there are any messages or not, this
allows us to utilize the time between messages, for example
to render a 3D scene.

Answer / sandeep

GetMessage essentially waits for any message to be placed in
the queue
before it returns. On other hadn, PeekMessage function does
not wait.
That means GetMessage can block until the message appears in
the queue.

Answer / amol lande

GetMessage:
a. It retrieves the message from the calling thread's message queue.
b. It blocks until it gets a message or an error occurs.
c. It can filter message as per specified filter.
PeekMessage:
a. It checks for the message in the calling thread's message queue and it retrieves the message if any present.
b. As specified in the argument, it may or may not removes the message from message queue.
c. It returns immediately if there is no message found in the message queue.

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