• I don't understand why this Swift 2 String() won't init

    From Mike@21:1/5 to All on Fri Dec 11 21:30:23 2015
    XPost: comp.sys.mac.programmer.misc

    I have this code in an os x playground (XCode Version 7.2 (7C68)):

    let urlString = "https://news.google.com"
    let url = NSURL(string: urlString)!
    let listData = NSData(contentsOfURL: url)!
    var dataString = String(data: listData, encoding: NSUTF8StringEncoding) print(dataString)

    and what seems to me to be equilivent code in an OS X app I'm building:

    static func httpRequest(urlString: String) -> String {
    if let url = NSURL(string: urlString) {
    if let urlData = NSData(contentsOfURL: url) {
    return String(data: urlData, encoding: NSUTF8StringEncoding) ?? "httpRequest: string failed"
    //var dataString = String(data: listData, encoding: NSUTF8StringEncoding)
    } else {
    return "httpRequest: nsdata failed"
    } else {
    return "httpRequest: nsurl failed"

    The "if let" constructs I added to find out what was happening. I
    could use one of the several wrappers around the HTTP get/et. al.,
    but I want to understand myself what's happening before I trust
    other code.

    In the playground the extraction from NSData works and the large
    (56K?) string is printed. In the OS X app the String() fails and I
    don't understand why.

    Why does the String() creation in the OS X app fail?


    (I'm using the "static func" construct inside a "struct" because
    this is the only way I have found to create tests without error.)

    (I've cross posted this to three groups total to get an answer.)


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