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"nick" <nileiqi@hotmail.com> wrote in message 
news:47b0d385$1@newsgroups.borland.com...

> (1) Receiving a message in application.
> (2) I want application receiving a message and then display some kind of 
> infomation. I can do that in traditional Windows API program but don't 
> know how to do it in C++ builder. Thanks.

Easy.  Let's say you want to know when the PC clock time has changed (I do 
this in one of my apps):

// in your header file
class TMyForm : public TForm
{
private:
    // declare a handler function for your message
    MESSAGE void __fastcall WM_TimeChange(TMessage &Message);

BEGIN_MESSAGE_MAP
    // associate your handler function with some message
    VCL_MESSAGE_HANDLER(WM_TIMECHANGE,              TMessage, 
WM_TimeChange);
END_MESSAGE_MAP(TForm);
};

// in your source file
// define the handler function
MESSAGE void __fastcall TMyForm::WM_TimeChange(TMessage &Message)
{
    // do something when the WM_TIMECHANGE message is received
}

This works for both Windows messages and application-defined messages.

- Dennis