Google Vision - OCR - Request must specify image and features - ios

Question

I am trying to Implement Google Vision OCR Request. Here is My Code,
func performImageRecognition(image: UIImage){
//1. Convert Image into base64 encoding
let imageData: Data = UIImageJPEGRepresentation(image, 1.0)!
let encodedString: String = imageData.base64EncodedString()
//2. Request Body for Vision OCR
let postBody: [String: Any] = getPOSTBody(base64: encodedString)
//3. API Call
AppDelegate.makeRequest(url: Request.url, requestBody: postBody, completionHandler: {
data, response, error in
print(error!)
do{
let dictionary = try JSONSerialization.jsonObject(with: data!, options: [])
print(dictionary)
self.activityindicator.stopAnimating()
}catch{
print("Error Parsing Data: \(error)" )
}
})
}
/*
* Request Body
*/
func getPOSTBody(base64: String) -> [String: Any]{
let json: [String: Any] = [
"requests": [["image": ["content": base64]],
["features": [["type": "TEXT_DETECTION"]]]
]
]
return json
}
Request Handler
class func makeRequest(url: URL, requestBody: [String: Any],completionHandler: #escaping (Data?, Int?, String?) -> Void){
var requestData: Data!
var urlRequest = URLRequest(url: url, cachePolicy: .reloadIgnoringLocalCacheData, timeoutInterval: 60)
// 1. Serialize the request body to Data
do{
requestData = try JSONSerialization.data(withJSONObject: requestBody, options: [])
}catch{
print("ERROR:: Generating data from JSON Body : \(error) ")
}
// 2. Setting up the required Header Fields
urlRequest.httpBody = requestData
urlRequest.addValue("\(requestData.count)", forHTTPHeaderField: "Content-Length")
urlRequest.addValue("application/json; charset=UTF-8", forHTTPHeaderField: "Content-Type")
urlRequest.httpMethod = "POST"
// 3. Creating the Session
let session = URLSession(configuration: .default)
let dataTask: URLSessionDataTask = session.dataTask(with: urlRequest, completionHandler: {
data, response, error in
if (error != nil){
print("Error is: \(error?.localizedDescription ?? "None")")
return
}
let resp = response as? HTTPURLResponse
DispatchQueue.main.async {
completionHandler(data, resp?.statusCode ?? 0, error?.localizedDescription ?? "None")
}
})
dataTask.resume()
}
Problem is getting "Bad Request, 400 Status, Request must specify image and features.".
I've Checked the Request body for isValidJSONObject, getting true. API is working fine on Postman.
Please let me know if i am missing something, Any Help will be appreciated.
Thank You

Answer 1

You'r sending different array for "image" and "features".
As per the Documentation request body should be as follow,
func getPOSTBody(base64: String) -> [String: Any]{
let json: [String: Any] = [
"requests": ["image": ["content": base64],
"features": [["type": "TEXT_DETECTION"]]
]
]
return json
}