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(C# UWP/WinRT) Xero Get Attachment (Download a Xero Attachment)Demonstrates how to get the content of an attachment in Xero. Note: This example requires Chilkat v9.5.0.64 or greater.
// Note: Requires Chilkat v9.5.0.64 or greater. // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Rest rest = new Chilkat.Rest(); bool success; // Before sending REST API calls, the REST object needs to be // initialized for OAuth1. // See Xero 2-Legged OAuth1 Setup for sample code. // Assuming the REST object's OAuth1 authenticator is setup, and the initial // connection was made, we may now send REST HTTP requests.. // -------------------------------------------------------------- // First get a list of attachments for a given document (in this case a Receipt). string endPoint = "Receipts"; string receiptID = "c4f40e59-c390-0001-caff-ce731c707d00"; Chilkat.StringBuilder sbPath = new Chilkat.StringBuilder(); sbPath.Append("/api.xro/2.0/{Endpoint}/{Guid}/Attachments/"); int numReplaced = sbPath.Replace("{Endpoint}",endPoint); numReplaced = sbPath.Replace("{Guid}",receiptID); string responseXml = await rest.FullRequestNoBodyAsync("GET",sbPath.GetAsString()); if (rest.LastMethodSuccess != true) { Debug.WriteLine(rest.LastErrorText); return; } // A 200 response is expected for actual success. if (rest.ResponseStatusCode != 200) { Debug.WriteLine(responseXml); return; } // Examine the response. Debug.WriteLine(responseXml); // A sample response looks like this: // <Response xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> // <Id>b235646f-34ac-4b15-90ce-d63267f7cd33</Id> // <Status>OK</Status> // <ProviderName>ChilkatPrivate</ProviderName> // <DateTimeUTC>2016-11-11T14:32:17.0908971Z</DateTimeUTC> // <Attachments> // <Attachment> // <AttachmentID>0edcddc8-325f-40c7-b950-8c71f14afc7c</AttachmentID> // <FileName>penguins.jpg</FileName> // <Url>http://api.xero.com/api.xro/2.0/Receipts/c4f40e59-c390-0001-caff-ce731c707d00/Attachments/penguins.jpg</Url> // <MimeType>image/jpg</MimeType> // <ContentLength>777835</ContentLength> // </Attachment> // <Attachment> // <AttachmentID>0adffdc8-325f-65c7-b950-4391f14af908</AttachmentID> // <FileName>starfish.jpg</FileName> // <Url>http://api.xero.com/api.xro/2.0/Receipts/c4f40e59-c390-0001-caff-ce731c707d00/Attachments/starfish.jpg</Url> // <MimeType>image/jpg</MimeType> // <ContentLength>24537</ContentLength> // </Attachment> // </Attachments> // </Response> Chilkat.Xml xml = new Chilkat.Xml(); xml.LoadXml(responseXml); // Iterate over the attachments and download each. int numRecords = xml.NumChildrenAt("Attachments"); Debug.WriteLine("Number of Attachments = " + Convert.ToString(numRecords)); Chilkat.StringBuilder sbSaveFilePath = new Chilkat.StringBuilder(); Chilkat.StringBuilder sbAttachmentPath = new Chilkat.StringBuilder(); Chilkat.BinData attachmentData = new Chilkat.BinData(); int i = 0; while (i < numRecords) { xml.I = i; string attachmentID = xml.GetChildContent("Attachments|Attachment[i]|AttachmentID"); string filename = xml.GetChildContent("Attachments|Attachment[i]|FileName"); Debug.WriteLine("AttachmentID: " + attachmentID); Debug.WriteLine("Filename: " + filename); Debug.WriteLine("----"); // Download this attachment. // First build the path for this particular attachment by appending the FileName to the path used to get the list of attachments. sbAttachmentPath.Clear(); sbAttachmentPath.AppendSb(sbPath); sbAttachmentPath.Append(filename); // Send the GET request in one call, and then get the response in the next two. success = await rest.SendReqNoBodyAsync("GET",sbAttachmentPath.GetAsString()); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } // Get the response header. If it's not a 200 success status code, then the response body does NOT contain // the attachment data. int statusCode = await rest.ReadResponseHeaderAsync(); if (statusCode == -1) { // We didn't get any response.. Debug.WriteLine(rest.LastErrorText); return; } if (statusCode != 200) { Debug.WriteLine("Response Status: " + Convert.ToString(statusCode)); string responseBody = await rest.ReadRespBodyStringAsync(); if (rest.LastMethodSuccess != true) { Debug.WriteLine("Failed to read the response body."); } else { Debug.WriteLine(responseBody); } Debug.WriteLine("Failed."); return; } // OK, the response header indicates the attachment content is forthcoming... // There are a few ways to get the response body. If it is a very large attachment, it can be streamed directly // to a file. We'll assume it's not, so we'll get the response into a BinData object, and then save it to a file. attachmentData.Clear(); success = await rest.ReadRespBdAsync(attachmentData); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } // Save the data to the file. sbSaveFilePath.SetString("qa_output/"); sbSaveFilePath.Append(filename); success = attachmentData.WriteFile(sbSaveFilePath.GetAsString()); if (success != true) { Debug.WriteLine("Failed to save to output file."); } else { Debug.WriteLine("Saved to " + sbSaveFilePath.GetAsString()); } i = i + 1; } |
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