R – iPhone NSURLConnection: What to do with returned NSData Object? Google Docs API

iphonensdatansurlconnectionobjective c

I'm working with the Google Docs API in my iPhone application. I've sent the proper POST request, and received a response along with some NSData. If I NSLog the NSData object, I get this:

NSData *returnedData = [NSURLConnection sendSynchronousRequest:request returningResponse:theResponse error:NULL];
NSLog(@"%@",returnedData);
//output : <4572726f 723d4261 64417574 68656e74 69636174 696f6e0a>

I think the NSData is either an NSDictionary or an NSArray. I'm supposed to receive a couple of items back, an SID, an LSID, and an Auth.

If I could turn the NSData chunk into an NSDictionary I could just find the object for whichever key.

Can anyone help?

Best Answer

You will have to decode the data. Try the following:

NSString *result= [[NSString alloc] initWithData:returnedData encoding:NSASCIIStringEncoding];

Of course this will depend on how the data is encoded. NSUTF8StringEncoding might work instead.

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Objective-c – Converting floats to NSData and back in Objective-C

Here is how to encode and decode a float with NSData:

encoding:

NSMutableData * data = [NSMutableData dataWithCapacity:0];
float z = ...;
[data appendBytes:&z length:sizeof(float)];

decoding:

NSData * data = ...; // loaded from bluetooth
float z;
[data getBytes:&z length:sizeof(float)];

A couple of things to note here:

1. You have to use NSMutableData if you are going to add things to the data object after creating it. The other option is to simply load the data all in one shot:

NSData * data = [NSData dataWithBytes:&z length:sizeof(float)];

2. the getBytes:length: method is for retrieving bytes from an NSData object, not for copying bytes into it.

Angular – How to check if JWT token is expired in Angular 8

Option 1 - Manual

Token expiry time is encoded in the token in UTC time format. So it can be fetched and checked manually against current time in UTC. Try the following

private tokenExpired(token: string) {
  const expiry = (JSON.parse(atob(token.split('.')[1]))).exp;
  return (Math.floor((new Date).getTime() / 1000)) >= expiry;
}

ngOnInit() {
  if (this.tokenExpired(token)) {
    // token expired
  } else {
    // token valid
  }
}

Option 2 - Using JwtHelperService

You could use the JwtHelperService's isTokenExpired() method to check if the token has expired already.

import {JwtHelperService} from '@auth0/angular-jwt';
.
.
constructor(private jwtHelper: JwtHelperService) { }

ngOnInit() {
  if (this.jwtHelper.isTokenExpired(token)) {
    // token expired 
  } else {
    // token valid
  }
}

Best Answer

Related Solutions

Objective-c – Converting floats to NSData and back in Objective-C

Angular – How to check if JWT token is expired in Angular 8

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