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Asked: 2026-05-10T17:37:57+00:00

I’m trying to parse objects to XML in Delphi, so I read about calling

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I’m trying to parse objects to XML in Delphi, so I read about calling the object’s ClassInfo method to get its RTTI info.

The thing is, this apparently only works for TPersistent objects. Otherwise, I have to specifically add a compiler directive {$M+} to the source code for the compiler to generate RTTI info.

So I happily added the directive, only to find that, even if it did return something from the ClassInfo call (it used to return nil), now I cannot retrieve the class’ properties, fields or methods from it. It’s like it created the object empty.

Any idea what am I missing here? Thanks!

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1 Answer

  1. Did you put those properties and methods into the published section?

    Besides that, ‘classical’ RTTI ($TYPEINFO ON) will only get you information on properties, not on methods. You need ‘extended’ RTTI ($METHODINFO ON) for those.

    Good starting point for extended RTTI: David Glassborow on extended RTTI

    (who would believe that just this minute I finished writing some code that uses extended RTTI and decided to browse the Stack Overflow a little:))

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