Question 1

How do I hook a Windows API function using DDetours?

Accepted Answer

First, include the DDetours library in your Delphi project, then use functions like InterceptCreate to set up hooks. Refer to the project Wiki for specific code examples and steps on managing trampolines and parameters.

Question 2

What's the difference between DDetours and Microsoft Detours?

Accepted Answer

DDetours is a pure Pascal library tailored for Delphi and Free Pascal, with integrated instruction decoding, while Microsoft Detours is a C/C++ library for general Windows hooking. DDetours offers better Pascal integration but may have fewer community resources compared to Microsoft's widely used alternative.

Question 3

Can DDetours hook functions in third-party DLLs without source code?

Accepted Answer

Yes, DDetours can intercept calls to functions in external DLLs by patching memory addresses or vtables, as mentioned in the README for Windows API and COM support. However, this requires careful handling of pointers and may involve legal considerations for proprietary software.

Question 4

Is DDetours compatible with the latest version of Delphi?

Accepted Answer

According to the README, DDetours supports Delphi up to version 10.3 (Rio). For newer versions like Delphi 11 or 12, compatibility is not guaranteed, so check the repository for updates or test thoroughly in your environment.

Question 5

How to safely remove a hook in a multithreaded application with DDetours?

Accepted Answer

Use the thread-safe unhooking functions provided by DDetours, as noted in the README. Ensure no threads are executing the hooked function during removal by implementing synchronization, such as critical sections, to prevent conflicts.

Question 6

What license does DDetours use, and can I use it in commercial projects?

Accepted Answer

The GitHub badge indicates an open-source license; check the LICENSE file for specifics, often MIT or similar. Most licenses allow commercial use, but verify terms regarding redistribution, modifications, and attribution to avoid legal issues.

Question 7

Does DDetours support hooking virtual methods in Delphi classes?

Accepted Answer

Yes, the README states that DDetours can hook object methods, including virtual ones, by name or index, and supports vtable patching for COM interfaces, making it versatile for object-oriented interception in Pascal code.

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