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i started creating application only using dpr file in delphi 2009 , i think all basic things work i use system ,sysutils and more.... but now i want to use timer and some other non-visual components (some basic indy components to use internet) is there any ways to do this i do not bother using units (but not forms)

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  • can we also use any non visual componets like this Commented Nov 1, 2010 at 4:23

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You can put non-visual components on a Data Module.

I use that a lot because you still have the design-time benefits (properties and events in the object inspector, logical placement in your designer).

--jeroen

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You can create any component by calling its constructor and passing nil as the owner. You won't need a parent form if you manage it yourself. But for some things, you will still need a project that uses forms, even if you're not placing your component on one. For TTimer, for example, you have to be running a VCL Forms app because it depends on Application and its message loop to make the timer work.

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You do not need a VCL Forms app in order to use TTimer. As long as there is a message loop that receives and dispatches WM_TIMER messages for the thread context that TTimer runs in, it will work fine. You can call the Win32 API Get/PeekMessage() and DispatchMessage() functions directly for that.

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