Can I create my own classes or units in Inno Setup?

I would like to know if it's possible in Inno Setup to define my own units or classes – with both fields (just like defining a record) and methods.

No, you can define only:

• structures (record keyword) – fields only, and
• interfaces (interface keyword) – abstract methods only – for COM/ActiveX.

But you cannot implement classes (fields and methods).

The Pascal Script does not even recognize the class keyword.

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Not even units. The Inno Setup Pascal Script is just a single block of code. There's no really any point trying to hide some implementation/code.

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If you just want to organize the code somehow, you can use the #include directive of Inno Setup pre-processor to split the code into files.

You can have a header/interface-like file with prototypes/forward declarations of the "public" functions/procedures and implementation-like file with the implementation and "private" functions/procedures.

The interface-like file (say header.iss):

procedure PublicProc; forward;

The implementation-like file (say impl.iss):

procedure PrivateProc;
begin
  ...
end;

procedure PublicProc;
begin
  PrivateProc;
end;

And use it like:

[Code]
 
#include "header.iss"

function InitializeSetup: Boolean;
begin
  // Here we can use the PublicProc, but not PrivateProc
end;

#include "impl.iss"