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Delphi Memory and Exceptions

Enforce safe memory management patterns in Delphi applications with try..finally and interface-based ownership.

48|12|Updated Mar 20, 2026
Search Tags:#ownership#memory#interface#exception#leaks#delphi#try-finally
One-click install
npx skills add https://github.com/delphicleancode/delphi-spec-kit --skill delphi-memory-and-exceptions
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Delphi Memory and Exceptions
Source: https://github.com/delphicleancode/delphi-spec-kit/tree/main/.claude/skills/delphi-memory-exceptions
Command: npx skills add https://github.com/delphicleancode/delphi-spec-kit --skill delphi-memory-and-exceptions

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Delphi memory management is manual for most objects and uses ARC only for interfaces, strings, dynamic arrays and anonymous types. Without disciplined ownership and error handling, memory leaks and unstable behavior creep into Delphi apps.

Core Features & Use Cases

  • Enforce safe memory patterns with try..finally to guarantee Free/FreeAndNil.
  • Promote interface-based ownership to automate lifecycle and reduce leaks.
  • Provide structured exception handling with domain-specific exceptions to improve reliability and testability.

Quick Start

Start by wrapping object creation in a try..finally block and preferring interfaces for memory management.

Frequently Asked Questions about Delphi Memory and Exceptions

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I prevent memory leaks in Delphi using try..finally blocks?▼

Prevent Delphi memory leaks by wrapping object creation in a try..finally block to guarantee object deallocation. This ensures Free or FreeAndNil executes deterministically even if an exception occurs during processing.

What is the best way to manage object lifecycle in Delphi without memory leaks?▼

The best way to manage object lifecycle is adopting interface-based ownership. Interfaces use automatic reference counting (ARC) in Delphi to automate object deallocation, reducing manual Free calls and preventing leaks.

How do I handle exceptions in Delphi to improve testability and reliability?▼

Handle Delphi exceptions reliably by introducing structured, domain-specific exceptions. Defanging common pitfalls with structured error handling improves application testability and ensures deterministic behavior during failures.

When do I need to use FreeAndNil instead of Free for Delphi memory management?▼

Use FreeAndNil instead of Free in Delphi memory management when you need to guarantee an object reference is cleared after deallocation. This prevents accidental access to dangling pointers within try..finally blocks.

Can I use dependency injection with interfaces to improve Delphi application testability?▼

Yes, you can promote dependency injection (DI) using Delphi interfaces to improve testability and reliability. Interface-based ownership enables automated lifecycle management and reduces manual memory management dependencies.

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