byte array to uiimageView in ios

Question

My requirement is that a local image will be converted to a byte array and then the byte array is converted back to the image

i have done the image to Byte array conversion but i trying bytearray convert to image and then display on UIIMageView code is no error but Image Converted to byte array but byte array converted io image but image is not display please give me any idea

Here is what I have so far

   UIImage *image = [UIImage imageNamed: @"shopper-home-copy_03.png"];




   //Output
   NSData *data = UIImagePNGRepresentation(image);

    NSUInteger len = data.length;

    uint8_t *bytes = (uint8_t *)[data bytes];

    NSMutableString *result = [NSMutableString stringWithCapacity:len * 3];


    [result appendString:@"["];

    for (NSUInteger i = 0; i < len; i++)
    {
        if (i)
        {

            [result appendString:@","];

        }

        [result appendFormat:@"%d", bytes[i]];
    }

    [result appendString:@"]"];
   NSMutableData *newdata = [NSMutableData new];
    NSScanner *theScanner = [NSScanner scannerWithString: result];
    while ([theScanner isAtEnd] == NO) {
        int a;
        [theScanner scanInt:&a];
        uint8_t b = a;
        [newdata appendBytes:(const void *)&b length:1];
    }

    UIImage *newImage = [UIImage imageWithData:newdata];
    self->imageView = [[UIImageView alloc] initWithImage:newImage];

    imageView.frame = CGRectMake(0, 25 , 150,150);

    [self.view addSubview:self->imageView];

Have a look, stackoverflow.com/questions/22316608/…

kukushi
– kukushi

2014-03-12 09:09:23 +00:00
Commented Mar 12, 2014 at 9:09 — kukushi
– kukushi, Commented Mar 12, 2014 at 9:09

Avt · Accepted Answer · 2014-03-12 09:41:50Z

1

First of all you should check is Base64 is suitable for you. If you still need your own format try following

NSMutableData *newData = [NSMutableData new];
NSScanner *theScanner = [NSScanner scannerWithString: result];
theScanner.charactersToBeSkipped = [NSCharacterSet characterSetWithCharactersInString:@"[],"];
while ([theScanner isAtEnd] == NO) {
    int a;
    [theScanner scanInt:&a];
    uint8_t b = a;
    [newData appendBytes:(const void *)&b length:1];
}
UIImage *newImage = [UIImage imageWithData:newData];

edited Mar 12, 2014 at 9:41

answered Mar 12, 2014 at 9:05

Avt

17.1k4 gold badges54 silver badges73 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Vasavi Over a year ago

NSMutableData *data = [NSMutableData new]; this line error

Vasavi Over a year ago

Redefinition of 'data' with a different type :'NSMutableData *_string' vs'NSdata *_string' this is error message

Avt Over a year ago

It is just because you already have data variable. I have renamed it with newData in the answer.

Vasavi Over a year ago

it's not Showing any error and then it's not Showing Image also please help me

Avt Over a year ago

I have just checked - everything works. Are you sure you did not forget to copy line theScanner.charactersToBeSkipped = [NSCharacterSet characterSetWithCharactersInString:@"[],"]; ? I can not find it in code you copy-pasted to question.

Shanti K · Accepted Answer · 2014-03-12 09:14:41Z

0

Create an NSData object from the byte array. And then use this

UIImage *image = [UIImage imageWithData:data];

answered Mar 12, 2014 at 9:14

Shanti K

2,9081 gold badge19 silver badges32 bronze badges

Comments

Himanshu Joshi · Accepted Answer · 2014-03-12 09:31:33Z

0

Convert byteArray to NSData and then to UIImage

-(UIImage *)convertToImageFromByteArray:(NSMutableString*)mutableStr{

    NSArray *byteArray = [mutableStr componentsSeparatedByString:@","];

    unsigned c = byteArray.count;
    uint8_t *bytes = malloc(sizeof(*bytes) * c);

    unsigned i;
    for (i = 0; i < c; i++)
    {
        NSString *str = [byteArray objectAtIndex:i];
        int byte = [str intValue];
        bytes[i] = (uint8_t)byte;
    }

    NSData *data = [NSData dataWithBytes:bytes length:c];

    return [UIImage imageWithData:data];
}

edited Mar 12, 2014 at 9:31

answered Mar 12, 2014 at 9:23

Himanshu Joshi

3,3991 gold badge22 silver badges32 bronze badges

3 Comments

Vasavi Over a year ago

I want Byte array convert to image

Himanshu Joshi Over a year ago

You have said that you want to convert NSMUtableString

Himanshu Joshi Over a year ago

if you want to convert byteArray then simply change the function to -(UIImage *)convertToImageFromByteArray:(NSArray*)byteArray and remove the line NSArray *byteArray = [mutableStr componentsSeparatedByString:@","];.

Community · Accepted Answer · 2017-05-23 11:43:58Z

0

Try this to convert string to bytes array..

first step to convert mutable string to array.

NSArray *strings = [<mutableString> componentsSeparatedByString:@","];

unsigned c = strings.count; // strings is the array instance from the mutable string (separate using ",")
uint8_t *bytes = malloc(sizeof(*bytes) * c);

unsigned i;

for (i = 0; i < c; i++)

{
NSString *str = [strings objectAtIndex:i];

int byte = [str intValue];
bytes[i] = byte;
}

from bytes convert to image is as follows..

NSData *imageData = [NSData dataWithBytesNoCopy:bytes length:c freeWhenDone:YES];
UIImage *image = [UIImage imageWithData:imageData];

reference from Byte Array to NSData

edited May 23, 2017 at 11:43

CommunityBot

11 silver badge

answered Mar 12, 2014 at 9:18

RAJA

1,22410 silver badges13 bronze badges

4 Comments

Vasavi Over a year ago

thanks fro Replay but i using NSMutableString unsigned c = strings.count; NSString *str = [strings objectAtIndex:i]; this 2 lines are Error please help me

Vasavi Over a year ago

Raja propetry 'count' not found on Object of type 'NSmutbaleString *' and NO Visible @interface for 'NSMutableString' declares the selecor 'objectAtIndex:'

Himanshu Joshi Over a year ago

Are you using NSMutableString?

Vasavi Over a year ago

@Raja Image is Not display

Collectives™ on Stack Overflow

byte array to uiimageView in ios

4 Answers 4

5 Comments

Comments

3 Comments

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

5 Comments

Comments

3 Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related