Facebook Methods description: friends.getAppUsers

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Returns the identifiers of the current user’s Facebook friends who are signed up for the specific calling application. The current user is determined from the session_key parameter. The values returned from this call are not storable.

Parameters

 

string api_key The application key associated with the calling application.
string session_key The session key of the logged in user.
float call_id The request’s sequence number. Each successive call for any session must use a sequence number greater than the last. We suggest using the current time in milliseconds, such as PHP’s microtime(true) function.
string sig An MD5 hash of the current request and your secret key, as described in the authentication guide.
string v This must be set to 1.0 to use this version of the API.
string format Optional - desired response format. Either “XML” (default) or “JSON”.
string callback Optional - wrap the response inside a function call. This is primarily to enable cross-domain javascript requests using the <script> tag, sometimes known as “JSONP“. This works with both XML and JSON.

Example Return XML

 

 

<?xml version="1.0" encoding="UTF-8"?>
<friends_getAppUsers_response xmlns="http://api.facebook.com/1.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://api.facebook.com/1.0/ http://api.facebook.com/1.0/facebook.xsd" list="true">
  <uid>222333</uid>
  <uid>1240079</uid>
</friends_getAppUsers_response>

Response

The friend ids returned are those friends signed up for the calling application, a subset of the friends returned from the facebook.friends.get method. If no friends are found, the method will return an empty friends_getAppUsers_response element.

FQL Equivalent

This function is similar to doing the following FQL query, with the appropriate parameters filled in:

 

SELECT uid FROM user
WHERE uid IN (SELECT uid2 FROM friend WHERE uid1=loggedInUid)
      AND is_app_user

Error codes

1 An unknown error occurred. Please resubmit the request.
2 The service is not available at this time.
4 The application has reached the maximum number of requests allowed. More requests are allowed once the time window has completed.
5 The request came from a remote address not allowed by this application.
101 The api key submitted is not associated with any known application.
102 The session key was improperly submitted or has reached its timeout. Direct the user to log in again to obtain another key.
103 The submitted call_id was not greater than the previous call_id for this session.
104 Incorrect signature.

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