how to convert byte array to image in ios - ios

Question

today my task is convert byte array to image
First I try to convert image to byte array :-
For converting Image to Byte array first we have to do is to convert that particular image [UIImage] to NSData.Then we will convert that NSData to Byte array. Here I will give the sample code, just go through...
//Converting UIImage to NSData
UIImage *image = [UIImage imageNamed: #"photo-04.jpg"];
NSData *imageData = UIImagePNGRepresentation(image);
//Converting NSData to Byte array
NSUInteger len = [imageData length];
NSLog(#"Byte Lendata1 %lu",(unsigned long)len);
Byte *byteData = (Byte*)malloc(len);
memcpy(byteData, [imageData bytes], len);
i am try like this Convert byte to imageView
const unsigned char *bytes = [imageData bytes];
NSUInteger length = [imageData length];
NSMutableArray *byteArray = [NSMutableArray array];
for (NSUInteger i = 0; i < length; i++) {
[byteArray addObject:[NSNumber numberWithUnsignedChar:bytes[i]]];
}
NSDictionary *dictJson = [NSDictionary dictionaryWithObjectsAndKeys:
byteArray, #"photo",
nil];
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictJson options:0 error:NULL];
NSLog(#"");
UIImage *image1 = [UIImage imageWithData:jsonData];
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 100, 50)];
imgView.image=image1;
I got output convert image to byte array but i want convert byte array to image
so please help me thanks in advanced.

Answer 1

First, you need to convert bytes to NSData
NSData *imageData = [NSData dataWithBytes:bytesData length:length];
Then, convert the data back to image.
UIImage *image = [UIImage imageWithData:imageData];
And I suggest you should first searching about the documentations when problems occur.
Here is all:
UIImage *image = [UIImage imageNamed:#"RAC.png"];
NSData *imageData = UIImagePNGRepresentation(image);
// UIImageJPGRepresentation also work
NSInteger length = [imageData length];
Byte *byteData = (Byte*)malloc(length);
memcpy(byteData, [imageData bytes], length);
NSData *newData = [NSData dataWithBytes:byteData length:length];
UIImage *newImage = [UIImage imageWithData:newData];
UIImageView *imageView = [[UIImageView alloc] initWithImage:newImage];
imageView.frame = CGRectMake(50, 50, 100, 100);
[self.view addSubview:imageView];

Answer 2

You are representing the data with wrong format
Your image is of format jpg and you are representing with PNG data.
For jpg or jpeg format you should use UIImageJPEGRepresentation
NSData * UIImageJPEGRepresentation (
UIImage *image,
CGFloat compressionQuality
);
The required statement will be
NSData *imageData = UIImageJPEGRepresentation(image, 0.0f);// Set Compression quality to 0.0. You can change it.
For png format you should use UIImagePNGRepresentation
NSData * UIImagePNGRepresentation (
UIImage *image
);
The required statement will be
NSData *imageData = UIImagePNGRepresentation(image);
To convert the NSData back to UIImage, use
UIImage *image = [UIImage imageWithData:imageData];
READ THE APPLE DOCS. SEE UNDER IMAGE MANIPULATION