RAD Studio VCL Reference
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TCommonDialog.DefaultHandler Method

Sends unhandled messages to Windows for processing.

Pascal
procedure DefaultHandler(var Message); override;
C++
virtual __fastcall DefaultHandler( Message);

DefaultHandler is called by Dispatch when it cannot find a method for a particular message. DefaultHandler sends these messages to the dialog's window procedure, where they are handled by Windows. 

 

WndProc 

Dispatch 

MessageHook

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