错误域=NSCocoaErrorDomain Code=3840 "字符周围的值无效

Question

我是iOS新手。我收到此错误：

Error Domain=NSCoaErrorDomain Code=3840"字符0周围的值无效。"UserInfo={NSDebugDescription=字符0周围的值无效。}反序列化JSON时出错：Error Domain=NSCoaErrorDomain Code=3840"JSON文本没有以数组或对象开头，也没有设置允许片段的选项。"UserInfo={NSDebugDescription=JSON文本没有以数组或对象开头，也没有设置允许片段的选项。}

我用谷歌搜索，但什么也没找到

以下是我的JSON:

{
    "LoginDetails": [{
        "UserId": 5,
        "Type": "Sales",
        "Name": "Andy",
        "EmailId": "[e-mail]",
        "MobileNo": "60863407"
    }]
}

这是我的代码。我做错什么了吗？

 func CheckLoginDrails() {   
     let parameters = ["Username=[e-mail]&Password=ANDY1969&DepartmentId=1"]
    guard let url = URL(string:"http://ash.no-ip.biz/MyService.asmx/A_loginDetailTailorApp_IOS")else{
        return
    }
    var request = URLRequest(url:url)
    request.httpMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    guard let httpbody = try?JSONSerialization.data(withJSONObject: parameters, options: []) else {
        return
    }
    request.httpBody = httpbody
    let session = URLSession.shared.dataTask(with: request) { (data, response, error) in
        if let response = response {
            print(response)
        }
        if let data = data {
            do{
                let json = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments)
                print(json)
            }catch{
                print(error)
            }
        }
        do {
            if let data = data,
                let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
                let blogs = json["LoginDetails"] as? [[String: Any]] {
                for blog in blogs {

                    let UserId = blog["UserId"] as? String
                    let name = blog["Name"] as? String
                    let email = blog["EmailId"] as? String
                    let Type = blog["Type"] as? String
                    let MobileNo = blog["MobileNo"] as? String

                    print("UserID: ",UserId)
                    print("Name: ",name)
                    print("Email",email)
                    print("Type: ",Type)
                    print("MobileNo: ",MobileNo)
                }
            }
        } catch {
            print("Error deserializing JSON: \(error)")
        }
    }
    session.resume()
}

Answer 1

您两次尝试反序列化响应，第二次尝试使用第一次的数据。

只需做一次：

func CheckLoginDrails() {   
    let parameters = ["Username=[e-mail]&Password=ANDY1969&DepartmentId=1"]
    guard let url = URL(string:"http://ash.no-ip.biz/MyService.asmx/A_loginDetailTailorApp_IOS")else{
        return
    }

    var request = URLRequest(url:url)
    request.httpMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    guard let httpbody = try?JSONSerialization.data(withJSONObject: parameters, options: []) else {
        return
    }

    request.httpBody = httpbody
    let session = URLSession.shared.dataTask(with: request) { (data, response, error) in
        if let response = response {
            print(response)
        }
        if let data = data {
            do{
                if let json = try JSONSerialization.jsonObject(with: data, options: []) as? [String:Any], let blogs = json["LoginDetails"] as? [[String: Any]] {
                    for blog in blogs {
                        let UserId = blog["UserId"] as? String
                        let name = blog["Name"] as? String
                        let email = blog["EmailId"] as? String
                        let Type = blog["Type"] as? String
                        let MobileNo = blog["MobileNo"] as? String

                        print("UserID: ",UserId)
                        print("Name: ",name)
                        print("Email",email)
                        print("Type: ",Type)
                        print("MobileNo: ",MobileNo)
                    }
                } else {
                    print("JSON wasn't a dictionary containing LoginDetails")
                }
            }catch{
                print(error)
                print("Actual result: \(String(data: data, encoding: .utf8))")
            }
        }
    }
    session.resume()
}

Answer 2

尝试像这样序列化 json

 var responseDict = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! [String:Any]

并删除另一种序列化方式，确保从服务器返回的数据是json可序列化的，方法是处理服务器家伙的伪返回，并在任何站点验证它为json

Answer 3

它不起作用的原因是，完全调用您所拥有的内容会返回500错误，数据如下所示：

("<!DOCTYPE html>\r\n<html>\r\n    <head>\r\n        <title>Only Web services with a [ScriptService] attribute on the class definition can be called from script.</title>\r\n        <meta name=\"viewport\" content=\"width=device-width\" />\r\n        <style>\r\n         body {font-family:\"Verdana\";font-weight:normal;font-size: .7em;color:black;} \r\n         p {font-family:\"Verdana\";font-weight:normal;color:black;margin-top: -5px}\r\n         b {font-family:\"Verdana\";font-weight:bold;color:black;margin-top: -5px}\r\n         H1 { font-family:\"Verdana\";font-weight:normal;font-size:18pt;color:red }\r\n         H2 { font-family:\"Verdana\";font-weight:normal;font-size:14pt;color:maroon }\r\n         pre {font-family:\"Consolas\",\"Lucida Console\",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt}\r\n         .marker {font-weight: bold; color: black;text-decoration: none;}\r\n         .version {color: gray;}\r\n         .error {margin-bottom: 10px;}\r\n         .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }\r\n         @media screen and (max-width: 639px) {\r\n          pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; }\r\n         }\r\n         @media screen and (max-width: 479px) {\r\n          pre { width: 280px; }\r\n         }\r\n        </style>\r\n    </head>\r\n\r\n    <body bgcolor=\"white\">\r\n\r\n            <span><H1>Server Error in \'/\' Application.<hr width=100% size=1 color=silver></H1>\r\n\r\n            <h2> <i>Only Web services with a [ScriptService] attribute on the class definition can be called from script.</i> </h2></span>\r\n\r\n            <font face=\"Arial, Helvetica, Geneva, SunSans-Regular, sans-serif \">\r\n\r\n            <b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.\r\n\r\n            <br><br>\r\n\r\n            <b> Exception Details: </b>System.InvalidOperationException: Only Web services with a [ScriptService] attribute on the class definition can be called from script.<br><br>\r\n\r\n            <b>Source Error:</b> <br><br>\r\n\r\n            <table width=100% bgcolor=\"#ffffcc\">\r\n               <tr>\r\n                  <td>\r\n                      <code>\r\n\r\nAn unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.</code>\r\n\r\n                  </td>\r\n               </tr>\r\n            </table>\r\n\r\n            <br>\r\n\r\n            <b>Stack Trace:</b> <br><br>\r\n\r\n            <table width=100% bgcolor=\"#ffffcc\">\r\n               <tr>\r\n                  <td>\r\n                      <code><pre>\r\n\r\n[InvalidOperationException: Only Web services with a [ScriptService] attribute on the class definition can be called from script.]\r\n   System.Web.Script.Services.WebServiceData..ctor(Type type, Boolean pageMethods) +619597\r\n   System.Web.Script.Services.WebServiceData.GetWebServiceData(HttpContext context, String virtualPath, Boolean failIfNoData, Boolean pageMethods, Boolean inlineScript) +286\r\n   System.Web.Script.Services.RestHandler.CreateHandler(HttpContext context) +109\r\n   System.Web.Script.Services.RestHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +63\r\n   System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +47\r\n   System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) +226\r\n   System.Web.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +145\r\n   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +155\r\n</pre></code>\r\n\r\n                  </td>\r\n               </tr>\r\n            </table>\r\n\r\n            <br>\r\n\r\n            <hr width=100% size=1 color=silver>\r\n\r\n            <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1055.0\r\n\r\n            </font>\r\n\r\n    </body>\r\n</html>\r\n<!-- \r\n[InvalidOperationException]: Only Web services with a [ScriptService] attribute on the class definition can be called from script.\r\n   at System.Web.Script.Services.WebServiceData..ctor(Type type, Boolean pageMethods)\r\n   at System.Web.Script.Services.WebServiceData.GetWebServiceData(HttpContext context, String virtualPath, Boolean failIfNoData, Boolean pageMethods, Boolean inlineScript)\r\n   at System.Web.Script.Services.RestHandler.CreateHandler(HttpContext context)\r\n   at System.Web.Script.Services.RestHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)\r\n   at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)\r\n   at System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig)\r\n   at System.Web.HttpApplication.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()\r\n   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)\r\n--><!-- \r\nThis error page might contain sensitive information because ASP.NET is configured to show verbose error messages using &lt;customErrors mode=\"Off\"/&gt;. Consider using &lt;customErrors mode=\"On\"/&gt; or &lt;customErrors mode=\"RemoteOnly\"/&gt; in production environments.-->")

错误域= NSCocoaErrorDomain Code = 3840“JSON文本没有以数组或对象开头，并且未设置允许片段的选项。”UserInfo = { NSDebugDescription = JSON文本未以数组或对象开头，并且未设置允许片段的选项。}

首先，请确保您实际上没有从 API 收到错误响应，您是：

<NSHTTPURLResponse: 0x6040002217c0> { URL: http://ash.no-ip.biz/MyService.asmx/A_loginDetailTailorApp_IOS } { Status Code: 500, Headers {