Ios – Cannot convert value of type ‘UInt’ to expected argument type ‘UnsafeMutablePointer‘

iosswift

I am trying to initialize a String from the content accessible by a URL:

actualresponse.response = String(contentsOfURL: url, usedEncoding: NSUTF8StringEncoding)

I get the following error thrown, pointing at the usedEncoding:

Cannot convert value of type 'UInt' to expected argument type 'UnsafeMutablePointer'

Can anyone tell me why this error is thrown and how I can fix it?

Best Answer

There are two similar but different methods which can be mistaken.

The usual method is

init(contentsOfURL url: NSURL,
    encoding enc: UInt) throws

The encoding parameter takes an NSStringEncoding value to specify the encoding, for example

let string = try? String(contentsOfURL:url, encoding:NSUTF8StringEncoding)

The second method retrieves the encoding from the file by passing a pointer as usedEncoding parameter
```
init(contentsOfURL url: NSURL,
    usedEncoding enc: UnsafeMutablePointer<UInt>) throws
```
The documentation says:

Upon return, if url is read successfully, contains the encoding used to interpret the data.

That means you have to pass a pointer which will contain the determined encoding of the file.
```
var encoding : NSStringEncoding = 0
let string = try? String(contentsOfURL:url, usedEncoding:&encoding)
```

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