我正在使用亚马逊MWS API下载包含订单的文本文件。 70％的时间文件下载完美，但有时我会腐败。如果我通过亚马逊网络前端查看该文件，它看起来很好。但是，当它存储在本地硬盘驱动器上时，它可能已损坏。我看不出为什么有些文件存在这个问题而其他文件没有模式，
我所说的腐败看起来像这样（数据已更改但突出显示问题）
payments-status order-id order-item-id payments-date payments-transaction-id item-name listing-id sku price shipping-fee quantity-purchased total-price purchase-date batch-id buyer-email buyer-name recipient-name ship-address-1 ship-address-2 ship-city ship-state ship-zip ship-country special-comments upc ship-method sales-channel VAT
205-2599941-6954759 11274234567395 07/01/2015 15:22:48 Europe/London My Product 1 1128h56V4X 9785858599053 3.59 2.8 1 6.39 07/01/2015 15:22:48 Europe/London bwfdsfs3tmf15w@marketplace.amazon.co.uk Mr F Bloggs Mr Fred Bloggs My Cottage XXXXXXX AnyTown Isle of Man XX1 2XX GB standard
205-499978-7575554 68198765457651 07/01/2015 15:28:23 Europe/London My Product 2 1128h56MWN9 9785858524633 5.99 2.8 1 8.79 07/01/2015 15:28:23 Europe/London zyrre44rrr7nk@marketplace.amazon.co.uk Jane Bloggs Prof Jane Blogs Her Cottage, XXXXXXX AnyTown Surrey XX1 2XX GB standard
.99 2.8 1 8.79 07/01/2015 14:07:33 Europe/London nuy76sz9fw4lzk@marketplace.amazon.co.uk Joe Bloggs Joe Bloggs 71 The Houses AnyTown MyCounty AA1 1WW GB standard
026-199993-8483529 38758765432635 07/01/2015 14:07:05 Europe/London My Product 3 ... 118h56QMBQR 9781783610433 5.99 2.8 1 8.79 07/01/2015 14:07:05 Europe/London h0hx8werwew4t4@marketplace.amazon.co.uk Claire Blogs Claire Bloggs XXXXXXX AnyTown JERSEY Channel Islands XX1 2XX GB standard
202-788880-2669961 46830987654327 07/01/2015 14:22:21 Europe/London My Product 4 1128h56V89 978585856766 3.59 2.8 1 6.39 07/01/2015 14:22:21 Europe/London w608ewrwewrk74l@marketplace.amazon.co.uk Harry Blogs Harry Bloggs XXXXXXX AnyTown Co Durham XX1 2XX GB standard
203-355556-3369905 34856789098939 07/01/2015 14:24:42 Europe/London My Product 5 118h56QLX1L 9785858512400 5.99 2.8 1 8.79 07/01/2015 14:24:42 Europe/London zgw0rwewere98y@marketplace.amazon.co.uk Aimee Blogs Aimee Bloggs XXXXXXX 25 Any Street AnyTown XX1 2XX GB standard
204-4888812-4296349 14153456784747 07/01/2015 14:41:10 Europe/London My Product 6 11278h5665F 9785858546360 3.59 2.8 1 6.39 07/01/2015 14:41:10 Europe/London h5mcwerwewwwfvrg3@marketplace.amazon.co.uk Julie Bloggs Julie Bloggs XXXXXXX AnyTown Devon XX1 2XX GB standard
026-1666655-8765
这是制表符分隔文件，第一列始终为空白字段。前两行显示正确的数据，在实际文件中有很多正确的行，然后才发现这种情况。第3行从行的开头缺少多个列，最后一行缺少第二个字段的一部分以及所有其余列。
我发现这种情况主要发生在文件的末尾。
所以我使用的代码是直接来自亚马逊网站Reports C# API的库：
private T Invoke<T, K>(IDictionary<String, String> parameters, K clazz)
{
String actionName = parameters["Action"];
T response = default(T);
String responseBody = null;
HttpStatusCode statusCode = default(HttpStatusCode);
ResponseHeaderMetadata rhm = null;
// Verify service URL is set.
if (String.IsNullOrEmpty(config.ServiceURL))
{
throw new MarketplaceWebServiceException(new ArgumentException(
"Missing serviceUrl configuration value. You may obtain a list of valid MWS URLs by consulting the MWS Developer's Guide, or reviewing the sample code published along side this library."));
}
/* Add required request parameters */
AddRequiredParameters(parameters);
String queryString = GetParametersAsString(parameters);
byte[] requestData = new UTF8Encoding().GetBytes(queryString);
HttpWebRequest request;
bool isStreamingResponse = ExpectStreamingResponse(typeof(K));
bool shouldRetry = true;
int retries = 0;
do
{
/* Submit the request and read response body */
try
{
RequestType requestType = GetMarketplaceWebServiceRequestType(typeof(K));
switch (requestType)
{
case RequestType.STREAMING:
{
SubmitFeedRequest req = clazz as SubmitFeedRequest;
if (req != null)
{
// SubmitFeedRequests can configure the content type.
request = ConfigureWebRequest(queryString, req.ContentType);
}
else
{
// Send request using a default content-type.
request = ConfigureWebRequest(queryString, new ContentType(MediaType.OctetStream));
}
}
break;
default:
request = ConfigureWebRequest(requestData.Length);
break;
}
WebHeaderCollection headers = request.Headers;
IDictionary<String, String> headerMap = GetHttpHeaderValues(clazz);
foreach (String key in headerMap.Keys)
{
headers.Add(key, headerMap[key]);
}
using (Stream requestStream = request.GetRequestStream())
{
switch (requestType)
{
case RequestType.STREAMING:
Stream inputStream = GetTransferStream(clazz, StreamType.REQUEST_STREAM);
inputStream.Position = 0;
CopyStream(inputStream, requestStream);
break;
default:
requestStream.Write(requestData, 0, requestData.Length);
break;
}
requestStream.Close();
}
using (HttpWebResponse httpResponse = request.GetResponse() as HttpWebResponse)
{
statusCode = httpResponse.StatusCode;
rhm = new ResponseHeaderMetadata(
httpResponse.GetResponseHeader("x-mws-request-id"),
httpResponse.GetResponseHeader("x-mws-response-context"),
httpResponse.GetResponseHeader("x-mws-timestamp"));
if (isStreamingResponse && statusCode == HttpStatusCode.OK)
{
response = HandleStreamingResponse<T>(httpResponse, clazz);
}
else
{
StreamReader reader = new StreamReader(httpResponse.GetResponseStream(), Encoding.UTF8);
responseBody = reader.ReadToEnd();
XmlSerializer serlizer = new XmlSerializer(typeof(T));
response = (T)serlizer.Deserialize(new StringReader(responseBody));
}
PropertyInfo pi = typeof(T).GetProperty("ResponseHeaderMetadata");
pi.SetValue(response, rhm, null);
shouldRetry = false;
}
/* Attempt to deserialize response into <Action> Response type */
}
/* Web exception is thrown on unsucessful responses */
catch (WebException we)
{
shouldRetry = false;
using (HttpWebResponse httpErrorResponse = (HttpWebResponse)we.Response as HttpWebResponse)
{
if (httpErrorResponse == null)
{
throw new MarketplaceWebServiceException(we);
}
statusCode = httpErrorResponse.StatusCode;
StreamReader reader = new StreamReader(httpErrorResponse.GetResponseStream(), Encoding.UTF8);
responseBody = reader.ReadToEnd();
}
/* Attempt to deserialize response into ErrorResponse type */
try
{
XmlSerializer serlizer = new XmlSerializer(typeof(ErrorResponse));
ErrorResponse errorResponse = (ErrorResponse)serlizer.Deserialize(new StringReader(responseBody));
Error error = errorResponse.Error[0];
bool retriableError = (statusCode == HttpStatusCode.InternalServerError || statusCode == HttpStatusCode.ServiceUnavailable);
retriableError = retriableError && error.Code != "RequestThrottled";
if (retriableError && retries < config.MaxErrorRetry)
{
PauseOnRetry(++retries);
shouldRetry = true;
continue;
}
else
{
shouldRetry = false;
}
/* Throw formatted exception with information available from the error response */
throw new MarketplaceWebServiceException(
error.Message,
statusCode,
error.Code,
error.Type,
errorResponse.RequestId,
errorResponse.ToXML(),
rhm);
}
/* Rethrow on deserializer error */
catch (Exception e)
{
if (e is MarketplaceWebServiceException)
{
throw e;
}
else
{
MarketplaceWebServiceException se = ReportAnyErrors(responseBody, statusCode, e, rhm);
throw se;
}
}
}
/* Catch other exceptions, attempt to convert to formatted exception,
* else rethrow wrapped exception */
catch (Exception e)
{
throw new MarketplaceWebServiceException(e);
}
} while (shouldRetry);
return response;
}
这些是传递的值：
- parameters Count = 3 System.Collections.Generic.IDictionary<string,string> {System.Collections.Generic.Dictionary<string,string>}
+ [0] {[Action, GetReport]} System.Collections.Generic.KeyValuePair<string,string>
+ [1] {[Merchant, A999AAAA7KT4OI]} System.Collections.Generic.KeyValuePair<string,string>
+ [2] {[ReportId, 59999999994]} System.Collections.Generic.KeyValuePair<string,string>
- clazz {MyCompany.MyApp.Amazon.MarketplaceWebService.Model.GetReportRequest} MyCompany.MyApp.Amazon.MarketplaceWebService.Model.GetReportRequest
Marketplace null string
marketplaceField null string
Merchant "A999AAAA7KT4OI" string
merchantField "A999AAAA7KT4OI" string
MWSAuthToken null string
mwsAuthTokenField null string
+ Report {System.IO.FileStream} System.IO.Stream {System.IO.FileStream}
+ report {System.IO.FileStream} System.IO.Stream {System.IO.FileStream}
ReportId "59999999994" string
reportIdField "59999999994" string
生成的文件保存到磁盘。
当这个问题首次出现时，我试图在寻找原因和正确修复时编写一个变通方法。这是打开文件并逐行循环，以确保每行以一个制表符开头，后跟3个数字和一个连字符，但现在由于最后一行不起作用。现在我有一点时间尝试找到为什么会发生这种情况。
我是用亚马逊提出来的，但他们说问题出在我的代码上（尽管是他们的代码）没有正确解析文件。
有人能说出为什么会发生这种情况或者指出我应该朝着哪个方向发展？
答案 0 :(得分：0)
我找到了这个问题的答案。我下载的文件是Amazon.txt，每次运行都会写入。一旦我将其更改为唯一的文件名，腐败问题就会消失。