__NSArrayM insertObject:atIndex:]; object cannot be nil

Question

I am a newcomer to iOS development. I would like to do encryption and decryption. My question is the following: When I was running my code, the decryption was working fine in the simulator but it is not running on an iPhone device. I get the following error message shown below:

[__NSArrayM insertObject:atIndex:]: object cannot be nil

Here is my code. I have defined an array containing multiple strings:

<dictionary>
<array>
      <string>india,chennai,salem,coimbatore,krishnagiri,hosur,palghat</string>
      <string>india1,chennai1,salem1,coimbatore1,krishnagiri1,hosur1,palghat1</string>
</array>
</dictionary>

NSString *stringIndex1 = [[NSString alloc]init];
NSMutableArray *arrAthigaaramList1;
dictDecryptList=[[NSMutableDictionary alloc]init];

for(int i=0;i<[arrD_Chapter count];i++)//50 Chapter wise
        {
            stringIndex1 = [arrD_Chapter objectAtIndex:i];
            NSData  *b64DecData = [Base64 decode:stringIndex1];
            NSData *decryptedData = [[NSData alloc]init];
            decryptedData= [b64DecData AESDecryptWithPassphrase:@"mypassword"];
            NSString *decryptedStr = [[NSString alloc] initWithData:decryptedData encoding:NSUTF32StringEncoding];

            NSLog(@"Decryped Data Base 64 encoded = %@",decryptedStr);

            [arrAthigaaramList1 addObject:decryptedStr];    
        }

What is wrong with this code?

I'm pretty sure your line NSString *decryptedStr = [[NSString alloc] initWithData:decryptedData encoding:NSUTF32StringEncoding]; is resulting in a nil string. What's the output of your log? — Hyperbole
– Hyperbole, Commented May 14, 2014 at 13:58

Barbara R · Accepted Answer · 2014-05-14 14:00:04Z

You should do the following:

NSString *stringIndex1 = [[NSString alloc]init];
NSMutableArray *arrAthigaaramList1 = [[NSMutableArray alloc] init];
dictDecryptList=[[NSMutableDictionary alloc]init];

for(int i=0;i<[arrD_Chapter count];i++)//50 Chapter wise
    {
        stringIndex1 = [arrD_Chapter objectAtIndex:i];
        NSData  *b64DecData = [Base64 decode:stringIndex1];
        NSData *decryptedData = [[NSData alloc]init];
        decryptedData= [b64DecData AESDecryptWithPassphrase:@"mypassword"];
        NSString *decryptedStr = [[NSString alloc] initWithData:decryptedData encoding:NSUTF32StringEncoding];

        if (decryptedStr) {
            NSLog(@"Decryped Data Base 64 encoded = %@",decryptedStr);
            [arrAthigaaramList1 addObject:decryptedStr];
        } else {
            NSLog(@"ERROR decrypting!!!");
        }


    }

This would allow you do 2 things:

1) Initialise the mutable array. 2) Do not try to insert a nil string after decrypting and logging the error.

Clad Clad · Accepted Answer · 2014-05-14 13:53:08Z

1

At first look, I would say that your NSMutableArray *arrAthigaaramList1; is not initialized :) so you can't add item !

Change it to :

NSMutableArray *arrAthigaaramList1 = [[NSMutableArray alloc]init];

answered May 14, 2014 at 13:53

Clad Clad

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