(Objective-C) 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 Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoHttp.h>
#import <CkoJsonObject.h>
#import <NSString.h>
#import <CkoBinData.h>

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

CkoHttp *http = [[CkoHttp alloc] init];

CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
BOOL success = [jsonToken LoadFile: @"qa_data/tokens/xero-access-token.json"];
if (success == NO) {
    NSLog(@"%@",jsonToken.LastErrorText);
    return;
}

http.AuthToken = [jsonToken StringOf: @"access_token"];

// Replace the value here with an actual tenant ID obtained from this example:
// Get Xero Tenant IDs
[http SetRequestHeader: @"Xero-tenant-id" value: @"83299b9e-5747-4a14-a18a-a6c94f824eb7"];

http.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
//     }
//   ]
// }

NSString *url = @"https://api.xero.com/api.xro/2.0/{$Endpoint}/{$Guid}/Attachments/{$AttachmentId}";

// Endpoint can be Invoices, Receipts, CreditNotes, PurchaseOrders, etc.
[http SetUrlVar: @"Endpoint" value: @"Invoices"];

// Guid is the ID of the item, such as the InvoiceID.
[http SetUrlVar: @"Guid" value: @"0032f627-3156-4d30-9b1c-4d3b994dc921"];

// AttachmentId is the ID of the particular attachment to be downloaded
[http SetUrlVar: @"AttachmentId" value: @"daf106e2-8634-4349-bfcc-86c1df0793b2"];

// Download the attachment data into bd.
CkoBinData *bd = [[CkoBinData alloc] init];
success = [http QuickGetBd: url binData: bd];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response Status Code: ",[http.LastStatus intValue]);

if ([http.LastStatus intValue] == 200) {
    // Success
    // Save to a file..
    success = [bd WriteFile: @"qa_output/penguines.jpg"];
}
else {
    // Failed.  bd contains error information..
    NSLog(@"%@",[bd GetString: @"utf-8"]);
}