Open Ephys common library template

This repository contains a template for building libraries intended to be used by plugins for the Open Ephys GUI. Information on the plugin architecture can be found on our wiki.

Creating a new library

1. Rename the "CommonLib" folder to the name the library file will have
2. Add source files to the Source folder. The existing files can be used as a template
3. Create the build files through CMake

Using external libraries

To link the library to other external libraries, it is necessary to manually edit the Build/CMakeLists.txt file. The code for linking libraries is located in comments at the end. For most commonly used libraries, the find_package option is recommended. An example would be

find_package(ZLIB)
target_link_libraries(${COMMONLIB_NAME} ${ZLIB_LIBRARIES})
target_include_directories(${COMMONLIB_NAME} PRIVATE ${ZLIB_INCLUDE_DIRS})

If there is no standard package finder for cmake, find_libraryand find_path can be used to find the library and include files respectively. The commands will search in a variety of standard locations For example

find_library(ZMQ_LIBRARIES NAMES libzmq-v120-mt-4_0_4 zmq zmq-v120-mt-4_0_4) #the different names after names are not a list of libraries to include, but a list of possible names the library might have, useful for multiple architectures. find_library will return the first library found that matches any of the names
find_path(ZMQ_INCLUDE_DIRS zmq.h)

target_link_libraries(${COMMONLIB_NAME} ${ZMQ_LIBRARIES})
target_include_directories(${COMMONLIB_NAME} PRIVATE ${ZMQ_INCLUDE_DIRS})

Providing libraries for Windows

Since Windows does not have standardized paths for libraries, as Linux and macOS do, it is sometimes useful to pack the appropriate Windows version of the required libraries alongside the library files. To do so, a libs directory has to be created at the top level of the repository, alongside this README file, and files from all required libraries placed there. The required folder structure is:

    libs
    ├─ include           #library headers
    ├─ lib
        ├─ x64           #64-bit compile-time (.lib) files
        └─ x86           #32-bit compile time (.lib) files, if needed
    └─ bin
        ├─ x64           #64-bit runtime (.dll) files
        └─ x86           #32-bit runtime (.dll) files, if needed

DLLs in the bin directories will be copied to the open-ephys GUI shared folder when installing.