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Message handler
Message handlers are methods that implement responses to dynamically dispatched messages. Delphi’s VCL uses message handlers to respond to Windows messages.
In Delphi a message handler is created by including the message directive in a method declaration, followed by an integer constant between 1 and 49151 which specifies the message ID.
In CBuilder the routine for handling the message can be declared as by the VCL_MESSAGE_HANDLER macro.
For example the two message handlers:
procedure WMVScroll(var Message: TWMVScroll);
Message WM_VSCROLL;
procedure WMHScroll(var Message: TWMHScroll);
Message WM_HSCROLL;
are translated to CBuilder C++:
MESSAGE void __fastcall WMVScroll( TWMVScroll& Message )
/*# WM_VSCROLL */;
MESSAGE void __fastcall WMHScroll( TWMHScroll& Message )
/*# WM_HSCROLL */;
BEGIN_MESSAGE_MAP
VCL_MESSAGE_HANDLER(WM_VSCROLL, TWMVScroll, WMVScroll)
VCL_MESSAGE_HANDLER(WM_HSCROLL, TWMHScroll, WMHScroll)
END_MESSAGE_MAP( TPanel )
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