# requestToDownloadRecordData

This method is to ask Cortex to download the EEG/motion/CQ/detections data of a record from the EMOTIV cloud.

## Use case

Suppose that the user has installed Cortex on 2 computers, named computer A and computer B. On computer A, the user creates a record, and Cortex uploads this record to the EMOTIV cloud.

Then, on computer B, Cortex automatically downloads the metadata of this record, ie its name, description, start time, end time, etc... So this record is visible when you call methods like [queryRecord](https://emotiv.gitbook.io/cortex-api/records/queryrecords)  or [getRecordInfos](https://emotiv.gitbook.io/cortex-api/records/getrecordinfos).

But Cortex doesn't automatically download the actual data of the record, ie the EEG, motion, CQ, the results of the detections, etc... So you cannot [export](https://emotiv.gitbook.io/cortex-api/records/exportrecord) this record. To download the actual data, you must call the method "requestToDownloadRecordData".

## Parameters

| Name        | Type               | Required | Description                                                                                     |
| ----------- | ------------------ | -------- | ----------------------------------------------------------------------------------------------- |
| cortexToken | `string`           | yes      | A token returned by [authorize](https://emotiv.gitbook.io/cortex-api/authentication/authorize). |
| recordIds   | `array of strings` | yes      | A list of record ids.                                                                           |

## Result

The result is an object with 2 fields:

| Name    | Type               | Description                                             |
| ------- | ------------------ | ------------------------------------------------------- |
| success | `array of objects` | List of the records that Cortex will start to download. |
| failure | `array of objects` | List of the records that Cortex will not download.      |

Each object in the success array include these fields:

| Name     | Type     | Description                                                                                                      |
| -------- | -------- | ---------------------------------------------------------------------------------------------------------------- |
| recordId | `string` | <p>The id of a record that was added to the Cortex download queue.</p><p>Cortex will now start the download.</p> |

Each object in the failure array include these fields:

| Name     | Type     | Description                                     |
| -------- | -------- | ----------------------------------------------- |
| recordId | `string` | The id of a record that Cortex cannot download. |
| code     | `number` | The error code for this record.                 |
| message  | `string` | The error message for this record.              |

## Example

{% tabs %}
{% tab title="Request" %}

```json
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "requestToDownloadRecordData",
  "params": {
    "cortexToken": "xxx",
    "recordIds": [
        "33a9aa44-5a90-4881-8613-78493752b86d", 
        "3a4b7eb0-3b6c-4e16-a480-cbda8181f092"
      ]
  }
}
```

{% endtab %}

{% tab title="Response" %}

```json
{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "failure": [{
      "code": -32186,
      "message": "The record already exists.",
      "recordId": "33a9aa44-5a90-4881-8613-78493752b86d"
    }],
    "success": [{
      "recordId": "3a4b7eb0-3b6c-4e16-a480-cbda8181f092"
    }]
  }
}
```

{% endtab %}
{% endtabs %}