Using DLL to make two projects share part of the code

Recently I have worked with my colleagues to develop a multi-process software. My colleagues write HMI (Interface) processes and I write COMM (Communication) processes. HMI provides read/write interfaces for shared memory. Both COMM and HMI use this interface to write the shared memory.
My COMM project needs to use interface functions provided by the HMI project. At this time, there are two options:
1. Copy the relevant files from the HMI project to the COMM project for compilation. One disadvantage of this approach is that every time the HMI project updates these interface functions, the COMM project must re-copy the code, integrate and compile new executable files, which is very inconvenient.

2. Generate the library file. The HMI designer establishes a new dynamic link library DLL project, copies the interface-related code to the DLL project, and generates a DLL library file. COMM Project
Copy the generated. dll file. lib and. H files to the project directory. In the Project --> Settings --> Link
Object/library
Add the. lib file name to modules and introduce the. h header file as needed. In this way, after the HMI project modifies the interface implementation, only the. dll and. lib files are required in the COMM project.
You can.