I am new to this technology.
I searched a lot but cant find any relevant.
In my application,I am receiving byte array from web service, my byte array which I receive from web service is
[137,80,78,71,13,10,26,10,0,0,0,13,73,72,68,82,0,0,1,195,0,0,1,195,8,2,0,0,0,215,2... ]
and I want to convert this byte array into UIImage for showing it in UIImageView.
Use below constructor for UIImage.
+ (UIImage *)imageWithData:(NSData *)data;
NSData *data = [NSData dataWithBytes:YOUR_BYTE_ARRAY length:ARRAY_LENGTH];
UIImage *img = [UIImage imageWithData:data];
UIImageView *imgView = [[UIImageView alloc]initWithImage:img];
The first 8 bytes in the byte array above, \211 P N G \r \n \032 \n (or 137,80,78,71,13,10,26,10 in decimal), reveal this to be a PNG file.
At the very least, you should be able to just save your entire byte sequence to a file, and load it using + (UIImage *)imageNamed:(NSString *)name or + (UIImage *)imageWithContentsOfFile:(NSString *)path. For example:
UIImage *myImage = [UIImage imageNamed:#"myfile.png"]
// myfile.png should be in the main bundle
(Apurv's method is more direct, and better for this reason. But since you are having such difficulty with it, I thought I'd suggest a slightly different approach.)
You need to Base64 decode the data first. Data that is returned from many SOAP web services is base 64 encoded as well as sometimes raw data embedded in websites. It is pretty simple to do but just easiest to use a library to someone else has created.
Start by including this in your project and including the .h in this file: https://github.com/nicklockwood/Base64
NSString *base64String = #"**YOUR BYE ARRAY HERE**";
UIImage *imageOrig = [UIImage imageWithData:[NSData dataFromBase64String:base64String]];
UIImageView *imageView = [[UIImageView alloc]initWithImage:imageOrig];
That should do it. In my previous experiences I just put what ever data blob I get over the webservice into a string then create the image using this method and it works great there is a great discussion on the details of Base64 encoding and decoding here : http://cocoadev.com/wiki/BaseSixtyFour which is what I used to create my class but Nick's code on gitHub is much better as its ARC compliant.
From Webservice we get array of NSNumber. We will have to convert it to NSData like this:
NSMutableData *data = [[NSMutableData alloc] initWithCapacity: [strings count]];
for( NSNumber *number in strings) {
char byte = [number charValue];
[data appendBytes: &byte length: 1];
}
Covert NSData to UIImage:
UIImage *imageOrig = [UIImage imageWithData:data];
We get JSON also out of NSData.
NSError *error1 = nil;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error1];
if (error1 != nil) {
NSLog(#"Error parsing JSON.");
} else {
NSLog(#"Array: %#", jsonArray);
}
//Use this
CGColorSpaceRef colorSpace=CGColorSpaceCreateDeviceRGB();
CGContextRef bitmapContext=CGBitmapContextCreate(YOUR_BYTE_ARRAY, w, h, 8, 4*w, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault);
CFRelease(colorSpace);
free(YOUR_BYTE_ARRAY);
CGImageRef cgImage=CGBitmapContextCreateImage(bitmapContext);
CGContextRelease(bitmapContext);
UIImage *newimage = [UIImage imageWithCGImage:cgImage];
[yourImageView setImage:newimage];
CGImageRelease(cgImage);
May be it will help you...
#import "NSDataAdditions.h"
NSData *dataObj = [NSData dataWithBase64EncodedString:StringImage];
UIImage *Image = [UIImage imageWithData:dataObj];
Related
I have array of image url. I want to show the images into UIImageView.
Now I convert the URL to NSData and then convert that into UIImage and then try to load that into UIImageView.
But it takes a lot of time to do this.
Is there a better way where in I can load the images in a faster and better manner?
Despite all of the answers on here telling you to do this in one line of code, it will sadly make no difference to the URL connection speed OR data / image decoding. If you want a faster way to TYPE the code then fine, but I would use category added to UIImageView....
#interface UIImageView (URL)
- (void)loadFromUrl:(NSString *)aUrl;
#end
#implementation UIImageView (URL)
- (void)loadFromUrl:(NSString *)aUrl {
NSURL *url = [NSURL urlWithString:aUrl];
NSData *data = [NSData dataWithContentsOfURL:url]
UIImage *image = [UIImage imageWithData:data];
if(image != nil) {
[self setImage:image];
}
}
#end
Now you can include the header and do...
[myImageView loadFromUrl:#"http://myurl.com/image.jpg"];
For more categories (I will be adding this one to my list!) check here. Those are all my useful ones, you may find them useful too! :)
Use everything in a single statement.
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:MyURL]]];
[UIImage imageWithData:[NSData dataWithContentsOfURL:]]
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:imageUrl]];
try this:-
image is UIImage and imageView is UIImageView
NSData *receivedData = [NSData dataWithContentsOfURL:#"yoururl"];
self.image=nil;
UIImage *img = [[UIImage alloc] initWithData:receivedData ];
self.image = img;
[img release];
[self.imageView setImage:self.image];
I need a method to convert a UIImage in a NSString and then convert the NSString back to a UIImage.
Thanks.
for >= IOS 7
- (NSString *)imageToNSString:(UIImage *)image
{
NSData *imageData = UIImagePNGRepresentation(image);
return [imageData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}
- (UIImage *)stringToUIImage:(NSString *)string
{
NSData *data = [[NSData alloc]initWithBase64EncodedString:string
options:NSDataBase64DecodingIgnoreUnknownCharacters];
return [UIImage imageWithData:data];
}
Convert it to a binary stream instead (NSData). This will depend on the format of your UIImage. If it's a JPEG/PNG for instance, you do:
NSData *data1 = UIImageJPEGRepresentation(image, 1.0);
NSData *data2 = UIImagePNGRepresentation(image);
UPDATE: Converting the binary data to NSString is a bad idea, that is why we have the class NSData. The OP wants to be able to send it as a data stream and then reconstruct it again; NSString will not be needed for this.
Convert to PNG or JPEG using UIImagePNGRepresentation or UIImageJPEGRepresentation, which will return an NSData, and then convert the NSData to a string (not sure how you want to do that mapping). How about just dealing with the NSData? You can read/write that to a file.
I have some data that is coming in xml tag from server and is in byte form
i have to convert it to UIImage
I have tried various links on google and also here but no help...
I have used
`NSData *fileData = [NSData dataWithBase64EncodedString:#"/qf20+EWOfpJfjrUaU6n1fSRjXF8ALQZEDy8v7az8Ks8/................SVrttqCVOp9X0kDtYXh2EZIHYGYfVUlptlcpTLtfnn7PR6Tbpl8rpjy93lxcYmDftq9ZSCVDQnruZm6unQYfhis/Ife/bWfu0CHxnMc3Qam9VpEPk/vftp91gZ`+N5ilMOg2lbByAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAIAgCAID//2Q=="];
They told about the dataWithBase64EncodedString: method which is not there in my version of xcode.
Please help.
You can make use of
UIImage *image = [[UIImage alloc] initWithData:data];
or
UIImage *image = [UIImage imageWithData:data];
The data in the data parameter must be formatted to match the file format of one of the system’s supported image types.
Try the following (where data is of the NSData type):
UIImage *img = [[UIImage alloc] initWithData: data];
I want to add my UIImage directly into the file instead of converting into UIImagePNGRepresentation or UIImageJPGRepresentation(as it takes time) like:-
UIImage *im = [UIImage imageWithCGImage:ref];
[array addObject:im];
NSData *data = [array objectAtIndex:i];
[data writeToFile:path atomically:YES];
But it is showing error.
So there is any way that i can do it.
Thanks in Advance.
your use of the array only obfuscates that you are basically doing:
NSData *data = im;
Which cannot possibly work because im is a UIImage, and not an NSData nor a subclass.
What you want to do is to create a new NSData and initialize it with the content of the image. Since you got a CGImageRef, I suggest using it directly, without using a UIImage in between.
CGDataProviderRef imageDataProvider = CGImageGetDataProvider(ref);
CFDataRef imageData = CGDataProviderCopyData(imageDataProvider);
NSData *data = (NSData*) imageData;
Note that it is OK to cast the CFDataRef to NSData* because CFData is “toll-free bridged” with its Cocoa Foundation counterpart, NSData.
I hope that helps.
(don't forget to release data when done)
How do you get a person's image from an iPhone address book?
You can do it like this....
NSData *imgData = (NSData *)ABPersonCopyImageData(person);
UIImage *img = [UIImage imageWithData:imgData];
where person is of type ABRecordRef. Now, as CFData and NSData are toll-free bridged, you can simply type cast CFData to NSData and get the image
Hope this helps.
(NSData*)ABPersonCopyImageDataWithFormat([targetPeople objectAtIndex:index], kABPersonImageFormatThumbnail)
This is faster since it returns a thumbnail.
Slightly refreshed code:
UIImage *image = nil;
#try
{
CFDataRef cfImage = ABPersonCopyImageData(person);
// or CFDataRef cfImage = ABPersonCopyImageDataWithFormat(person, kABPersonImageFormatThumbnail);
if (cfImage)
{
image = [UIImage imageWithData:(__bridge NSData*)cfImage];
CFRelease(cfImage);
}
}
#catch (NSException *exception)
{
//...
}