Adding NSData to a NSData Byte Array

Question

I want to add an image to a byte array. The following code gives me an error. I think i have not done it correctly.

Error

Field has incomplete type 'NSData *__strong[]'

In the .m file

@interface MyViewController() {

    NSData *byteArray[];

}

inside the method

NSData *imgD = UIImageJPEGRepresentation(img1, 0.1);

NSData *imgD2 = UIImageJPEGRepresentation(img2, 0.1);        

NSData *imgD3 = UIImageJPEGRepresentation(img13, 0.1);

 [byteArray addObject:imgD];

 [byteArray addObject:imgD2];

 [byteArray addObject:imgD3];

possible duplicate of [How to create byte array from NSData](http://stackoverflow.com/questions/8019382/how-to-create-byte-array-from-nsdata) — Razvan, May 11 '15 at 08:21

V.J. · Answer 1 · 2015-05-11T08:39:05.347

1

You can add an image to an array. Use NSMutableArray instead of NSData*[].

In the .m file

@interface MyViewController() {    
    NSMutableArray *byteArray;    
}

inside the method

byteArray = [[NSMutableArray alloc] init];   
NSData *imgD = UIImageJPEGRepresentation(img1, 0.1);    
NSData *imgD2 = UIImageJPEGRepresentation(img2, 0.1);            
NSData *imgD3 = UIImageJPEGRepresentation(img13, 0.1);

[byteArray addObject:imgD]; 
[byteArray addObject:imgD2];
[byteArray addObject:imgD3];

edited May 11 '15 at 08:39

answered May 11 '15 at 08:30

V.J.

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Please follow Objective-C coding conventions. Instance variables should always start with an underscore, not doing so is the cause of countless errors haunting beginners. And it would be better to make byteArray a property, not an instance variable. – gnasher729 May 11 '15 at 09:43

Adding NSData to a NSData Byte Array

1 Answers1