# CortexClientDelegate protocol

```cpp
#import <EmotivCortexLib/CortexClient.h>
```

```objectivec
@protocol CortexClientDelegate
@required
- (void)authenticationFinished:(NSString* )authenticationCode 
                     withError:(NSError*)error;
- (void)processResponse:(NSString*)responseMessage;
@end
```

Your application must implement this protocol and use it as a delegate for the class [CortexClient](https://emotiv.gitbook.io/cortex-library-for-mobile/objective-c-api/cortexclient-class).

### authenticationFinished

```objectivec
- (void)authenticationFinished:(NSString* )authenticationCode
                     withError:(NSError*)error;
```

The Cortex Library calls **authenticationFinished** after you called the function [authenticate](https://emotiv.gitbook.io/cortex-library-for-mobile/cortexclient-class#authenticate). If there is no error, then the parameter **authenticationCode** contains a code that you can use to call the JSON API method [loginWithAuthenticationCode](https://emotiv.gitbook.io/cortex-library-for-mobile/jsonapi/loginwithauthenticationcode).

## processResponse

```objectivec
- (void)processResponse:(NSString*)responseMessage;
```

The argument **responseMessage** is a JSON message sent by the Cortex library.


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