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WH_CALLWNDPROC and WH_CALLWNDPROCRET Hooks
The WH_CALLWNDPROC and WH_CALLWNDPROCRET hooks enable you to monitor messages
sent to window procedures by the SendMessage function. Windows calls a WH_CALLWNDPROC hook procedure before passing the
message to the receiving window procedure, and calls the WH_CALLWNDPROCRET hook
procedure after the window procedure has processed the message.
The WH_CALLWNDPROCRET hook passes the address of a CWPRETSTRUCT structure to the hook procedure. The structure contains the return value from
the window procedure that processed the message, as well as the message
parameters associated with the message. Subclassing the window does not work for
messages set between processes.
For more information, see the CallWndProc and CallWndRetProc functions.
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