What question did this study set out to answer?

The aim is to provide practical guidance for safely calling Win32 APIs and managing native DLL interactions from C#.

July 29, 2026Open Access

Safely Calling Win32 APIs from C# — A Practical P/Invoke Guide (DllImport / LibraryImport / CsWin32) (archived 2026-07-27)

Key Points

The aim is to provide practical guidance for safely calling Win32 APIs and managing native DLL interactions from C#.
Discusses DllImport and LibraryImport for API calls.
Explains automatic signature generation via CsWin32.
Covers handle management, error handling, and struct layout considerations.
Identifies common pitfalls in string marshalling and callback lifetime management.
Describes systematic differences between 32-bit and 64-bit APIs.
Instructs on selecting between C++/CLI and COM for interoperability.

Abstract

A practical rundown of what to watch for when calling Win32 APIs and native DLLs from C# via P/Invoke. Covers the differences between DllImport and LibraryImport, automatic signature generation with CsWin32, string marshalling pitfalls, handle lifetime management with SafeHandle, SetLastError and error handling, StructLayout for structs, callback lifetime management, 32/64-bit differences, and how to choose among C++/CLI and COM, with working examples. Archived version of https://comcomponent.com/en/blog/pinvoke-safe-guide/, as published on 2026-07-27. The live article is maintained and may change after this date. First published 2026-07-04.

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