Delphi to C Migration

Delphi applications can contain years of valuable business rules, database workflows, and desktop functionality. Zwiegnet provides Delphi to C migration services to help organizations understand and modernize legacy Object Pascal code, extract reusable logic, and move selected components toward portable C-based systems.

Delphi and C have different object models, runtime libraries, memory-management expectations, and UI frameworks. A successful migration starts with an application assessment and a clear plan—not a blind syntax conversion.

Our migration process includes:

• Application Assessment – Review Delphi projects, Object Pascal units, packages, third-party components, build settings, and runtime dependencies.
• Business Logic Extraction – Identify domain rules, calculations, and processing routines that can be separated from forms and platform-specific code.
• Language and Runtime Mapping – Plan equivalents for classes, records, strings, exceptions, collections, and memory ownership in C.
• Database and Integration Review – Document database access, stored procedures, file formats, network protocols, and external APIs.
• User Interface Strategy – Decide whether the existing interface remains in place, is replaced separately, or is redesigned for a new platform.
• Incremental Component Migration – Convert and validate suitable modules in manageable stages, preserving stable interfaces between old and new code.
• Build and Platform Porting – Establish reproducible C builds with GCC or Clang and identify dependencies that prevent Linux, Unix, or other target-platform support.
• Functional and Regression Testing – Compare business outputs, database changes, error handling, and edge cases against the existing application.
• Documentation and Handoff – Record architecture decisions, integration boundaries, and maintenance guidance for the resulting codebase.

Depending on the application, the best outcome may be a full rewrite, staged replacement, or migration of selected core libraries while keeping the existing user interface temporarily.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct, personal service for practical legacy modernization.