redcap_instrument_download function

Download REDCap Instruments

Download instruments as a pdf, with or without responses.

redcap_instrument_download(
  file_name = NULL,
  directory = NULL,
  overwrite = FALSE,
  redcap_uri,
  token,
  record = character(0),
  instrument = "",
  event = "",
  verbose = TRUE,
  config_options = NULL,
  handle_httr = NULL
)

Arguments

• file_name: The name of the file where the downloaded pdf is saved. Optional.
• directory: The directory where the file is saved. By default current directory. Optional.
• overwrite: Boolean value indicating if existing files should be overwritten. Optional.
• redcap_uri: The uri/url of the REDCap server typically formatted as "https://server.org/apps/redcap/api/". Required.
• token: The user-specific string that serves as the password for a project. Required.
• record: The record ID of the instrument(s). If empty, the responses are blank. Optional.
• instrument: The instrument(s) to download. If empty, all instruments are returned. Optional.
• event: The unique event name. For a longitudinal project, if record is not blank and event is blank, it will return data for all events from that record. If record is not blank and event is not blank, it will return data only for the specified event from that record. Optional.
• verbose: A boolean value indicating if messages should be printed to the R console during the operation. Optional.
• config_options: A list of options passed to httr::POST(). See details at httr::httr_options(). Optional.
• handle_httr: The value passed to the handle parameter of httr::POST(). This is useful for only unconventional authentication approaches. It should be NULL for most institutions. Optional.

Returns

Currently, a list is returned with the following elements,

• success: A boolean value indicating if the operation was apparently successful.

• status_code: The http status code

  of the operation.

• outcome_message: A human readable string indicating the operation's outcome.

• record_id: The record_id of the instrument.

• elapsed_seconds: The duration of the function.

• raw_text: If an operation is NOT successful, the text returned by REDCap. If an operation is successful, the raw_text is returned as an empty string to save RAM.

• file_name: The name of the file persisted to disk. This is useful if the name stored in REDCap is used (which is the default).

Details

Currently, the function doesn't modify any variable types to conform to REDCap's supported variables. See validate_for_write() for a helper function that checks for some common important conflicts.

The function redcap_download_instrument() is soft-deprecated as of REDCapR 1.2.0. Please rename to redcap_instrument_download().

Examples

## Not run:

uri     <- "https://redcap-dev-2.ouhsc.edu/redcap/api/"
token   <- "F9CBFFF78C3D78F641BAE9623F6B7E6A" # simple-write
# event <- "" # only for longitudinal projects

(full_name <- base::tempfile(pattern="instruments-all-records-all", fileext = ".pdf"))
result_1   <- REDCapR::redcap_instrument_download(
  file_name     = full_name,
  redcap_uri    = uri,
  token         = token
)
base::unlink(full_name)

(full_name <- base::tempfile(pattern="instruments-all-record-1-", fileext = ".pdf"))
result_2   <- REDCapR::redcap_instrument_download(
  record        = 5,
  file_name     = full_name,
  redcap_uri    = uri,
  token         = token
)
base::unlink(full_name)
(full_name <- base::tempfile(pattern="instrument-1-record-1-", fileext=".pdf"))
result_3   <- REDCapR::redcap_instrument_download(
  record        = 5,
  instrument    = "health",
  file_name     = full_name,
  redcap_uri    = uri,
  token         = token
)
base::unlink(full_name)
## End(Not run)

References

The official documentation can be found on the 'API Help Page' and 'API Examples' pages on the REDCap wiki (i.e., https://community.projectredcap.org/articles/456/api-documentation.html and https://community.projectredcap.org/articles/462/api-examples.html). If you do not have an account for the wiki, please ask your campus REDCap administrator to send you the static material.

Author(s)

Will Beasley