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Here are some suggested Delphi interview questions. Describe how components are loaded from a DFM file at runtime. What is the difference between TGraphicControl and TWinControl? Write a function that reverses a string. If a component has another component as a property (example: TDatasource has a TDataset component as a property), what happens if the “pointed to“ component is deleted? Where does TCustomControl fit into the VCL heirarchy? What is the purpose and significance of the TPersistent class? What are the three methods required for an implementation of IInterface? What do they do? What class in the VCL heirarchy implements IInterface?
EditCDC
- Jul 16th, 2009
TGraphicControl vs TWinControlThe TGraphicControl class provides the capability to have controls which are not windowed controls (they have no window handle). TWinControl is the base class from whic...
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How is message handling handled in Delphi?
EditCDC
- Jul 16th, 2009
Define custom messageconst WM_MY_MESSAGE = WM_USER + 0;Define handler for message type TMyForm = class(TForm) private procedure OnMyMessage(var Msg: TMessage); message WM_MY_MESSAGE;Send or Post message PostMessage(self.Handle,WM_MY_MESSAGE,0,0)
delphiking
- Jan 9th, 2009
Through event handlers. You can also define your own messages using the WMUSER constant.
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Delphi Components
What is the default extension of file when we create user components?
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Delphi Interview Questions
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