How to get supplier email contacts with iPhone os?

I finally got it

[gsAPI sendRequest:@"socialize.getContacts" params:nil useHTTPS:YES delegate:self context:nil];

}

- (void) gsDidReceiveResponse:(NSString*)method response:(GSResponse*)response context:(id)context
{ 
NSString *resMsg = [NSString stringWithFormat:@"\n errorCode=%d\n errorMessage=%@\n response.data=%@\n",   
                    response.errorCode, response.errorMessage, [response.data stringValue]];  
  NSLog(@"gsDidReceiveResponse:\nMethod=%@\nResponse=%@\n context=%@",method,resMsg,context);
}