CODEWITHSUNDEEP
iphonensstringnsurlnsbundle
Daniel Klöck
Daniel Klöck

Reputation: 21157

Get image bytes

I am trying to load the bytes of an image like this:

NSURL *img = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"img" ofType:@"png"] isDirectory:NO];
NSString * test = [NSString stringWithContentsOfFile:[img absoluteString] encoding:NSASCIIStringEncoding error:&err];

But I always get following error:

Error Domain=NSCocoaErrorDomain Code=260 "The operation couldn\u2019t be completed. 
(Cocoa error 260.)" UserInfo=0xc02abf0 
{NSFilePath=file://localhost/Users/admin/Library/Application%20Support/iPhone%20Simulator/4.3.2/Applications/C55551DB-152A-43D6-A1E0-9845105709D6/myApp.app/img.png,
 NSUnderlyingError=0xc02ccc0 "The operation couldn\u2019t be completed. Folder or file does not exist"}

However the file DOES exist, and if I copy/paste the NSFilePath into the browser it finds the image. What could be wrong?

Upvotes: 1

Views: 538

Answers (4)

akk
akk

Reputation: 135

 NSData* imageData = UIImagePNGRepresentation("imagename.."); //the image is converted to bytes

Upvotes: 0

beryllium
beryllium

Reputation: 29767

Store bytes in NSData:

NSData *bytes = UIImagePNGRepresentation([UIImage imageNamed:@"myImage.png"]);

Upvotes: 1

deanWombourne
deanWombourne

Reputation: 38485

Why not

NSString *path = [[NSBundle mainBundle] pathforResource:@"img" ofType:"png"];

NSData *data = [NSData dataWithContentsOfFile:path];

You can't just store random bytes in an NSString - it will try to convert them into a string and might fail. You need to use an NSData object for binary data.

You also don't need to use NSURLs at all; NSBundle will give you a path as a string.

Upvotes: 2

Akshay
Akshay

Reputation: 5765

As you are using the file URL, use [img path] instead of [img absoluteString] in the second line.

Or use [NSURL URLWithPath] in the first line.

Upvotes: 1

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