(Lianja) Xero Download Attachment for an Item (such as an Invoice)

Demonstrates how to download a particular attachment for a particular Xero item.

For more information, see https://developer.xero.com/documentation/api/attachments#GET

Chilkat Lianja Extension Download Chilkat Lianja Extension

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loHttp = createobject("CkHttp")

loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.LoadFile("qa_data/tokens/xero-access-token.json")
if (llSuccess = .F.) then
    ? loJsonToken.LastErrorText
    release loHttp
    release loJsonToken
    return
endif

loHttp.AuthToken = loJsonToken.StringOf("access_token")

// Replace the value here with an actual tenant ID obtained from this example:
// Get Xero Tenant IDs
loHttp.SetRequestHeader("Xero-tenant-id","83299b9e-5747-4a14-a18a-a6c94f824eb7")

loHttp.Accept = "application/json"

// The example to list Xero attachments shows how to get attachment information.
// Here's a sample JSON response obtained form listing attachments:
// Your application can get the AttachmentID's and filenames from it.

// {
//   "Id": "24bfbcb9-dec9-4d33-835c-8f165d776766",
//   "Status": "OK",
//   "ProviderName": "Chilkat2222",
//   "DateTimeUTC": "\/Date(1587213296972)\/",
//   "Attachments": [
//     {
//       "AttachmentID": "daf106e2-8634-4349-bfcc-86c1df0793b2",
//       "FileName": "penguins.jpg",
//       "Url": "https://api.xero.com/api.xro/2.0/Invoices/0032f627-3156-4d30-9b1c-4d3b994dc921/Attachments/penguins.jpg",
//       "MimeType": "image/jpg",
//       "ContentLength": 777835
//     }
//   ]
// }

lcUrl = "https://api.xero.com/api.xro/2.0/{$Endpoint}/{$Guid}/Attachments/{$AttachmentId}"

// Endpoint can be Invoices, Receipts, CreditNotes, PurchaseOrders, etc.
loHttp.SetUrlVar("Endpoint","Invoices")

// Guid is the ID of the item, such as the InvoiceID.
loHttp.SetUrlVar("Guid","0032f627-3156-4d30-9b1c-4d3b994dc921")

// AttachmentId is the ID of the particular attachment to be downloaded
loHttp.SetUrlVar("AttachmentId","daf106e2-8634-4349-bfcc-86c1df0793b2")

// Download the attachment data into bd.
loBd = createobject("CkBinData")
llSuccess = loHttp.QuickGetBd(lcUrl,loBd)
if (llSuccess = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    release loJsonToken
    release loBd
    return
endif

? "Response Status Code: " + str(loHttp.LastStatus)

if (loHttp.LastStatus = 200) then
    // Success
    // Save to a file..
    llSuccess = loBd.WriteFile("qa_output/penguines.jpg")
else
    // Failed.  bd contains error information..
    ? loBd.GetString("utf-8")
endif



release loHttp
release loJsonToken
release loBd