PostMessage and unprocessed messages

Hi,
I'm developing and application that read a stream from serial port,
trasform byte in a structure and send it to the top-most dialog that
uses those data. When a frame is received I create (new) my structure
and send with a postmessage to the top-most dialog (it delete the
message too). What happen if I close the dialog before all messages
are elaborated ? Is there a way to wait until all messages are
processed ? How can I prevent leakage if some messages weren't
elaborated ?

Thanks in advance,
Stefano
.

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