今天再次上網找 COM port 元件... 雖然抓了很多... 不過還沒試出來... 但是卻有意外驚喜，與大家分享一下。 資料來源： http://www.mestdagh.biz/ http://users.pandora.be/sonal.nv/components.html    

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Cleanup when closing
When an appliation is closed there is often need for some cleanup or savings of some work. Some events are fired when the application terminate, but it is depending on how the application is closed and often different in main form than in other forms. These are the called events: When closing the main form, the following main form events are called: OnCloseQuery OnClose OnDestroy For the other forms: OnDestroy When windows shutdown, all forms: OnCloseQuery When a WM_QUIT message is received, or calling Application.Terminate, all forms: OnDestroy This means you have to build some simple logic if you have to do savings / cleanup at the end of the application's lifetime. It can be the same in all forms: In OnCloseQuery: Set a boolean and call the cleanup code In OnDestroy: Check the boolean, and if not set then call the cleanup code

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