(Objective-C) Xero List Attachments for an Item (such as an Invoice)

Demonstrates how to get information about the attachments for a particular Xero item.

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

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#import <CkoHttp.h>
#import <CkoJsonObject.h>
#import <NSString.h>
#import <CkoHttpResponse.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";

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

// 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"];

CkoHttpResponse *resp = [http QuickRequest: @"GET" url: url];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

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

CkoJsonObject *jsonResponse = [[CkoJsonObject alloc] init];
[jsonResponse Load: resp.BodyStr];
jsonResponse.EmitCompact = NO;
NSLog(@"%@",[jsonResponse Emit]);

if ([resp.StatusCode intValue] != 200) {
    NSLog(@"%@",@"Failed.");

    return;
}

// Sample response:
// 
// Use the this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

// {
//   "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 *AttachmentID = 0;
NSString *FileName = 0;
NSString *v_Url = 0;
NSString *MimeType = 0;
int ContentLength;

NSString *Id = [jsonResponse StringOf: @"Id"];
NSString *Status = [jsonResponse StringOf: @"Status"];
NSString *ProviderName = [jsonResponse StringOf: @"ProviderName"];
NSString *DateTimeUTC = [jsonResponse StringOf: @"DateTimeUTC"];
int i = 0;
int count_i = [[jsonResponse SizeOfArray: @"Attachments"] intValue];
while (i < count_i) {
    jsonResponse.I = [NSNumber numberWithInt: i];
    AttachmentID = [jsonResponse StringOf: @"Attachments[i].AttachmentID"];
    FileName = [jsonResponse StringOf: @"Attachments[i].FileName"];
    v_Url = [jsonResponse StringOf: @"Attachments[i].Url"];
    MimeType = [jsonResponse StringOf: @"Attachments[i].MimeType"];
    ContentLength = [[jsonResponse IntOf: @"Attachments[i].ContentLength"] intValue];
    i = i + 1;
}