ios - Swift - NSJsonSerialization - "Unable to convert data to string around character"错误

Question

当尝试发布带有字典作为参数的 url 时，出现以下错误；

NSCocoaErrorDomain Code=3840 "Unable to convert data to string around character 34

下面是我的代码；

    func postOrder() {

    let params = [
        “date”: ”25.12.2015”,
        “time” : “22:34”,
        “order_no”: “23232322”,
        "user_id" : “23232”
           ] as Dictionary<String, String>

    let request = NSMutableURLRequest(URL: NSURL(string: "http://webservis.xxxxx.com/post_order.asp")!)

    let session = NSURLSession.sharedSession()
    request.HTTPMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

    request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(params, options: [])

    let task = session.dataTaskWithRequest(request) { data, response, error in

       guard data != nil else {
            print("no data found: \(error)")
            return
        }

        let cfEnc = CFStringEncodings.ISOLatin5
        let enc = CFStringConvertEncodingToNSStringEncoding(CFStringEncoding(cfEnc.rawValue))

        let outputString = NSString(data: data!, encoding: enc)


        do {
            if let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {
                let success = json["success"] as? Int                                  
                print("Success: \(success)")
            } else {

                let cfEnc = CFStringEncodings.ISOLatin5
                let enc = CFStringConvertEncodingToNSStringEncoding(CFStringEncoding(cfEnc.rawValue))

                let jsonStr = NSString(data: data!, encoding: enc)   
                print("Error could not parse JSON: \(jsonStr)")
            }
        } catch let parseError {
            print(parseError)                                                        

            let cfEnc = CFStringEncodings.ISOLatin5
            let enc = CFStringConvertEncodingToNSStringEncoding(CFStringEncoding(cfEnc.rawValue))

            let jsonStr = NSString(data: data!, encoding: enc)
            print("Error could not parse JSON: '\(jsonStr)'")
        }
    }

    task.resume()

}

上面的代码有什么问题，有人可以帮忙吗？

Answer 1

检查您正在解析的数据是否确实是有效的 JSON(而不仅仅是“接近”JSON)。当您有无法解析为 JSON 的不同数据格式时，就会发生该错误。

将您的 params 替换为以下内容，然后重试。

let params = [
        "date": "25.12.2015",
        "time" : "22:34",
        "order_no": "23232322",
        "user_id" : "23232"
           ] as Dictionary<String, String>

此外，您可以查看以下帖子iOS 5 JSON Parsing Results in Cocoa Error 3840