I have my own general purpose unit with functions and procedures I often
use. There are also some routines that operate on TStringGrid types so I
had to add GRIDS to the uses clause in the interface part of this unit.
If I now write a very simple "Hello World" program that uses just one
simple function from my unit I get errors
Error: Undefined symbol: WSRegisterCustomImageList
Error: Undefined symbol: WSRegisterMenuItem
etc.
at the end of my program. After a long searching I found out that I had
to add INTERFACES to the uses clause of my program. My questions:
How should anybody know that this is required in this situation?
Why is the INTERFACES unit not required in the unit itself?
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