This is how I create Data from UIImage:
let data = UIImagePNGRepresentation(image)
And then I need to convert it to String;
if let data = data {
let stringFromData = String(data: data, encoding: .utf8)
}
but stringFromData is nil. Why?
You can get it using the Data method base64EncodedString()
if let data = data {
let stringFromData = data.base64EncodedString()
// to decode base 64 string you can use Data base64Encoded String initializer
if let dataFromBase64 = Data(base64Encoded: stringFromData) {
print(data)
}
}
Convert Your image data in Base64 string
For Encode
let stringFromData : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
And decode
let strBase64 = imageData.base64EncodedStringWithOptions(.allZeros)
Related
I have a NSData object which needs to be converted to [String:Any] and here is the code I tried:
let multiOrder = _fields["multiOrder"] as? GPBValue
if let _ = multiOrder {
let data = NSKeyedArchiver.archivedData(withRootObject: multiOrder!)
if let responseString = String(data: data, encoding: .utf8) {
print(responseString)
}
}
GPBValue object looks like NSObject<NSSecureCoding, NSCopying>
But the above code is returning nil
I am trying to convert an image into data and then that data into a string using this code but it fail on conversion when i want to convert data into string
let data = UIImagePNGRepresentation(selectedImageImageView.image!)
let datastring = String(data: data!, encoding: .utf8)
it gives some in data, but always nil in datastring
cant figure it out where the problem is if anyone knows please help... thanks
if let img = selectedImageImageView.image {
if let data = UIImagePNGRepresentation(img) {
if let datastring = data.base64EncodedStringWithOptions(.Encoding64CharacterLineLength) {
println(datastring)
}
}
}
I'm trying to send image to server via JSON string. Problem is the server didn't see my image in PNG or JPG format. Here is code how i do it:
enter image description here
That how i convert parameters to JSON string
enter image description here
What i want - it's encode UIImage to base64 string and send to server.
Thank You!
try using the below code and check if any error occurs or image value is nil
if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
if let imageData = UIImageJPEGRepresentation(image, 0.5) {
let base64String = imageData.base64EncodedString(options: Data.Base64EncodingOptions.init(rawValue: 0))
let dict: [String: Any] = ["data": base64String]
do {
let data = try JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted)
if let string = String(data: data, encoding: .utf8) {
socket.write(string)
}
} catch {
print(error.localizedDescription)
}
}
}
I'm trying to encode and decode Emojis to send them to my database.
I use this to encode:
var comentario = String()
let data = Comment.data(using: String.Encoding.nonLossyASCII, allowLossyConversion: true)
if let data = data {
let emojiString = NSString(data: data, encoding: String.Encoding.utf8.rawValue)! as String
comentario = emojiString
}
And it works. But now I don't know how to decode the emoji.
This is the type of encode ---> \ud83d\ude1a
Your encoding code can be simplified to
func encode(_ s: String) -> String {
let data = s.data(using: .nonLossyASCII, allowLossyConversion: true)!
return String(data: data, encoding: .utf8)!
}
Note that it encodes all non-ASCII characters as \uNNNN, not only
Emojis. Decoding is done by reversing the transformations:
func decode(_ s: String) -> String? {
let data = s.data(using: .utf8)!
return String(data: data, encoding: .nonLossyASCII)
}
This returns an optional because it can fail for invalid input.
Example:
let s = "Hello 😃."
let e = encode(s)
print(e) // Hello \ud83d\ude03.
if let d = decode(e) {
print(d) // Hello 😃.
}
Of course you can also define the code as extension methods of the
String type, and you might want to choose better function names.
I fixed this. If you have a server with encode utf8mb4, then for encoding emojis use this code:
var comentario = String()
let data = Comment.data(using: String.Encoding.nonLossyASCII, allowLossyConversion: true)
if let data = data {
let emojiString = NSString(data: data, encoding: String.Encoding.utf8.rawValue)! as String
comentario = emojiString
}// comentario contains the emoji encoded
DECODING:
let data = comentarios.data(using: String.Encoding.utf8, allowLossyConversion: false)
if data != nil{
let valueunicode = NSString(data: data!, encoding: String.Encoding.nonLossyASCII.rawValue) as? String
if valueunicode != nil{
comentarios = valueunicode!
}
}//comentarios contantes the deecode string(emoji)
When I get my JSON back from my API this is how it looks
{
data:[
100,
80,
105,
99,
etc
]
}
How do I take this array and turn it back into a base64 string, then NSData and finally UIImage.
Here is what I have thus far.
let byteArray = todo["image"]["data"].arrayObject
var data = NSData(bytes: byteArray!, length: byteArray!.count)
var image = UIImage(data: data)
When printing the data it prints fine but returns nil for image.
Have you tried iterating throug the array and building a string from its elements, the use base64 encoding/decoding api to get back from string to NSData? Something like that(I'm writing from iPad so I can't check).
var encodedString=""
for smallString in byteArray {
encodedString += String(smallString)
}
let data = NSData(base64EncodedString: base64Encoded, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)
var image = UIImage(data: data)
let byteArray = todo["image"]["data"].arrayObject
let string = String(bytes: byteArray, encoding: .utf8)
let encodedImageData = string
let imageData = NSData(base64Encoded: encodedImageData!)
let image = UIImage(data: imageData! as Data)