(Delphi ActiveX) Shopify Query a variant for its inventory item ID

Query a product variant to find the ID of its inventory item.

For more information, see https://shopify.dev/tutorials/manage-product-inventory-with-admin-api#retrieve-the-inventory-levels-for-a-product-variant

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: TChilkatHttp;
resp: IChilkatHttpResponse;
jsonResponse: TChilkatJsonObject;
id: Integer;
product_id: Integer;
title: WideString;
inventory_item_id: Integer;
admin_graphql_api_id: WideString;

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

http := TChilkatHttp.Create(Self);

http.Login := 'SHOPIFY_PRIVATE_API_KEY';
http.Password := 'SHOPIFY_PRIVATE_API_KEY';

http.Accept := 'application/json';

resp := http.QuickRequest('GET','https://{shop}.myshopify.com/admin/api/2020-04/products/{product_id}/variants/{variant_id}.json');
if (http.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Response Status Code: ' + IntToStr(resp.StatusCode));

jsonResponse := TChilkatJsonObject.Create(Self);
jsonResponse.Load(resp.BodyStr);
jsonResponse.EmitCompact := 0;
Memo1.Lines.Add(jsonResponse.Emit());

if (resp.StatusCode <> 200) then
  begin
    Memo1.Lines.Add('Failed.');

    Exit;
  end;

// Sample output...
// (See the parsing code below..)
// 
// Use the this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

// {
//   "id": 12195009364024,
//   "product_id": 1321541042232,
//   "title": "xs",
// ...
//   "inventory_item_id": 12250274365496,
// ...
//   "admin_graphql_api_id": "gid://shopify/ProductVariant/12195009364024"
// }
// 

id := jsonResponse.IntOf('id');
product_id := jsonResponse.IntOf('product_id');
title := jsonResponse.StringOf('title');
inventory_item_id := jsonResponse.IntOf('inventory_item_id');
admin_graphql_api_id := jsonResponse.StringOf('admin_graphql_api_id');
end;