How to convert image into binary format in iOS?

Question

I am working on a project where I need to upload image to my server. I want to store my image's binary data to BLOB data type field in database. Therefore I need to convert my image into binary format. So that it can be saved on servers database.

So How to convert an image into binary format? Please advise.

Alexander

Use the CoreGraphics' method UIImagePNGRepresentation(UIImage *image), which returns NSData and save it this way. – Exactitude

Thanks @BuntyMadan But it doesn't convert image in binary format. – Alexander

But You can send the NSData raw data to the server and then convert it into UIImage. – Exactitude

What do you mean by binary format? – Leandro

Yeah, define "binary format". Everything on the phone is binary. – Antonia

Answer 1

You can use the CoreGraphics' method UIImagePNGRepresentation(UIImage *image), which returns NSData and save it. and if you want to convert it into again UIImage create it using [UIimage imageWithData:(NSData *data)] method.

Demo to send your UIImage to Server

- (void)sendImageToServer {
       UIImage *yourImage= [UIImage imageNamed:@"image.png"];
       NSData *imageData = UIImagePNGRepresentation(yourImage);
       NSString *postLength = [NSString stringWithFormat:@"%d", [imageData length]];

       // Init the URLRequest
       NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
       [request setHTTPMethod:@"POST"];
       [request setURL:[NSURL URLWithString:[NSString stringWithString:@"http://yoururl.domain"]]];
       [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
       [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
       [request setHTTPBody:imageData];

       NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
       if (connection) {
       }
       [request release];
 }

Exactitude

May you provide a Swift example of just the first two lines (before code block)? I'm trying it and it's not working. – Scalage

Answer 2

Use:

NSData *data = UIImageJPEGRepresentation(image, 1.0);
//OR
NSData *data = UIImagePNGRepresentation(image);

According to requirement.

Noleta