Error Handling

Overview

As you might have read along these documents, most of the MobbScanAPI callbacks have an error as their last argument. This is the way MobbScan let you know the reason why a process did not end successfully.

The possible error comes in the form of a NSError where:

• code: is a NSInteger which value matches the enum type MobbScanAPIErrorCode
• userInfo: is a NSDictionary for further information, being both keys and values NSString

Error Codes

The following table shows the possible error codes and their meaning:

Code	Meaning
SCANNING_PROCESS_CANCELLED	The user cancelled the scanning process
CONNECTION_ERROR	A network connection error happened
LICENSE_ERROR	The license is not valid or has not been configured
WRONG_PARAMETERS_ERROR	Some of the parameters are not valid
SCAN_PROCESS_NOT_STARTED	The scan process has not been started
SCAN_ID_DOES_NOT_MATCH	The provided scan id does not match the currently started scan
DEVICE_NOT_COMPATIBLE	Device does not fulfill the minimum requirements
UNEXPECTED_ERROR	Something unexpected happened during the process
API_NOT_INITIALIZED	MobbScanAPI was not properly initialised
CAMERA_NOT_VALID_FOR_VALIDATION	Device camera does not fulfill the needed specs
NOT_AVAILABLE_IN_OFFLINE_MODE	The process is only available online
CAPTURE_FACE_ERROR	Facial detection could not accomplished
PROCESS_CANCELLED	The user cancelled any process (document detection, face validation...)
TIMEOUT_ERROR	The process timeout expired
ANTISPOOFING_ERROR	The antispoofing mechanism cannot ensure the user is genuine
DOCUMENT_NOT_CLASSIFIED	The system is not able to classify the document (only applicable for generic document types, i.e. ESP)
DOCUMENT_NOT_VALID	The document did not pass the validations (applicable when specific validations are activated)

Extra Information

As mentioned above, chances are that a process may need to expose further information about an error. This is an example of what you would get for a scan process when the validations failed:

Swift

ObjectiveC

if let error = error {
  print("Failed validations: \((error as NSError).userInfo["extraInfo"] ?? "")")
}

NSLog(@"Failed validations: %@", [[error userInfo] valueForKey:@"extraInfo"]);

The console will print:

Failed validations: validationMRZ, validationDocumentNotExpired, validationBothSidesMatchScore