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The library installation involves three easy (famous last words) steps.
This package relies on edfapi library that is as part of the
EyeLink Developers Kit. Therefore, read_edf()
function will not work without it but you will still be
able to use utility functions. The EyeLink Developers Kit can
be downloaded from www.sr-research.com/support
website. Note that you need to register and wait for your account to be
activated. Next, follow instructions to install EyeLink Developers
Kit for your platform. The forum thread should be under SR
Support Forum › Downloads › EyeLink Developers Kit / API › Download:
EyeLink Developers Kit / API Downloads (Windows, macOS, Linux).
The package needs to configure compiler flags for its dependency on EDF API library. Specifically, it needs to specify paths to include header files ( edf.h, edf_data.h, and edftypes.h) and to the library itself. The package will try to compile using sensible defaults for each platform, i.e., default installation paths for EyeLink Developers Kit v2.1.1. However, these defaults may change in the future or you may wish to install the library to a non-standard location (relevant primarily for Windows).
If compilation with default paths fails, you need to define R
environment variables as described below. These variables must be
defined either in user or project .Renviron
file. The simplest way to edit it is via usethis library and edit_r_environ()
function. Type usethis::edit_r_environ() for user and
usethis::edit_r_environ('project') for projects
environments (note that the latter shadows the former, read documentation for details). In the
case of Windows, note that you do not need to worry about forward
vs. backward slashes as R will normalize strings for you. Once you
define the variables, restart session and check them by typing
Sys.getenv() (to see all variables) or
Sys.getenv("EDFAPI_INC") to check a specific one.
Default values assume that the EyeLink Developers Kit is installed in
c:/Program Files (x86)/SR Research/EyeLink (default
installation path).
EDFAPI_LIB : path to edfapi.dll for
32-bit systems. Defaults to
c:/Program Files (x86)/SR Research/EyeLink/libs.EDFAPI_LIB64 (optional): path to
edfapi64.dll for 64-bit systems. By
default, the 64-bit library is in x64 subfolder, i.e.,
c:/Program Files (x86)/SR Research/EyeLink/libs/x64. This
variable is optional, as the package will try to guess this by itself by
appending /x64 to EDFAPI_LIB path. However,
you should specify this variable explicitly if 64-libraries are in a
non-standard folder (or SR Research changed it, or you just want to be
sure).EDFAPI_INC : path to C header files necessary for
compilation. Specifically, the package requires edf.h,
edf_data.h, and edftypes.h. Defaults to
c:/Program Files (x86)/SR Research/EyeLink/Includes/eyelink.Your .Renviron file include lines similar to the ones
below
EDFAPI_LIB="c:/Program Files (x86)/SR Research/EyeLink/libs"
EDFAPI_LIB64="c:/Program Files (x86)/SR Research/EyeLink/libs/x64"
EDFAPI_INC="c:/Program Files (x86)/SR Research/EyeLink/Includes/eyelink"EDFAPI_INC : path to C header files necessary for
compilation. Specifically, the package requires edf.h,
edf_data.h, and edftypes.h. Defaults to
/usr/include/EyeLink.Your .Renviron file should include a line like this
EDFAPI_INC="/usr/include/EyeLink"EDFAPI_LIB: path to EDF API framework. Defaults to
/Library/FrameworksEDFAPI_INC : path to C header files necessary for
compilation. Specifically, the package requires edf.h,
edf_data.h, and edftypes.h. Defaults to
/Library/Frameworks/edfapi.framework/HeadersYour .Renviron file include lines similar to the ones
below
EDFAPI_LIB="/Library/Frameworks"
EDFAPI_INC="/Library/Frameworks/edfapi.framework/Headers"To install from github
library("devtools")
install_github("alexander-pastukhov/eyelinkReader", dependencies=TRUE, build_vignettes = TRUE)These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.