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?

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  • Jul 16th, 2009
 

TGraphicControl vs TWinControl

The TGraphicControl class provides the capability to have controls which are not windowed controls (they have no window handle).

TWinControl is the base class from which all windowed controls descend. It is at the TWinControl level that the window handle is introduced.

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