[英]WCF REST Service & iOS Error Handling With NSError
I have a WCF RESTful service and am trying to sketch out how I will handle errors on the server and various clients. 我有WCF RESTful服务,正在尝试勾画如何处理服务器和各种客户端上的错误。 The service will be accessible from both web (jQuery) and iOS products. 可以从Web(jQuery)和iOS产品访问该服务。 Here is a look at how I'm throwing errors on the service: 这是我如何在服务上引发错误的一个例子:
[WebGet(UriTemplate = "get/{id}", ResponseFormat = WebMessageFormat.Json)]
public Person Get(string id)
{
//check security
if(!SecurityHelper.IsAuthenticated()) { throw new WebFaultException<PersonException>(new PersonException { Reason = "Permission denied." }, HttpStatusCode.Unauthorized); }
I can use jQuery to call the service like such: 我可以使用jQuery这样调用服务:
$.ajax({
type: "GET",
dataType: "json",
url: "/person/get/123",
success: function(data) {
alert('success');
},
error: function(xhr, status, error) {
alert("AJAX Error!");
alert(xhr.responseText);
}
});
});
...and everything works great - the call is made and the error is thrown (as I have not supplied any authentication) and the error: callback is called. ...而且一切工作正常-进行了调用,并引发了错误(因为我没有提供任何身份验证),并且错误:调用了回调。 In the error callback when I examine xhr.responseText I get the correct JSON object ({"reason":"Permission denied!"}) showing the error reason that was supplied by the server. 在检查xhr.responseText的错误回调中,我得到了正确的JSON对象({“原因”:“权限被拒绝!”}),显示了服务器提供的错误原因。
Now - I'm trying to put together my iOS app to call the same service and everything is working great from there as well except I can't get the error details that were supplied by the service. 现在-我正在尝试将我的iOS应用放在一起以调用相同的服务,并且从那里开始一切都很好, 除非我无法获得该服务提供的错误详细信息。 Here is the code I have in my call to the REST service from iOS: 这是我从iOS调用REST服务时使用的代码:
//set up for any errors
NSError *error = nil;
//set up response
NSURLResponse *response = [[NSURLResponse alloc] init];
//make the request
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
//check for error
if(error)
{
//debug
NSLog(error.description);
//send back error
return error;
}
else
{
In the error.description I'm only getting a generic message like "The operation couldn't be completed." 在error.description中,我仅收到一条通用消息,例如“操作无法完成”。
How do I go about getting custom error information that is sent by the server? 如何获取服务器发送的自定义错误信息? I've been looking at the userInfo property on the NSError class but cannot figure out if I can get at the custom info and, if so, how I go about doing it. 我一直在看NSError类的userInfo属性,但无法弄清楚我是否可以获取自定义信息,如果可以的话,我该如何去做。
Thanks in advance for any help. 在此先感谢您的帮助。
The error message will be on the data returned by the request (the response body): 错误消息将出现在请求(响应主体)返回的数据上:
//make the request
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (error) {
if (data) {
NSString *respBody = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
} else {
NSLog(@"%@", error.description);
}
}
else
{
// get response
}
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