Pascal (Lazarus/Delphi)

OpenAI (ChatGPT) Create Image

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Show how to send a POST to create an image. Gets the JSON response with URLs and then downloads images to files. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.StringBuilder,
  Chilkat.HttpResponse,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  json: TJsonObject;
  resp: THttpResponse;
  sbResponseBody: TStringBuilder;
  jResp: TJsonObject;
  respStatusCode: Integer;
  url: string;
  sbLocalFilePath: TStringBuilder;
  created: Integer;
  i: Integer;
  count_i: Integer;

begin
  success := False;

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

  http := THttp.Create;

  //  Implements the following CURL command:

  //  curl https://api.openai.com/v1/images/generations \
  //    -H "Content-Type: application/json" \
  //    -H "Authorization: Bearer $OPENAI_API_KEY" \
  //    -d '{
  //      "prompt": "A cute baby sea otter",
  //      "n": 2,
  //      "size": "1024x1024"
  //    }'

  //  Use the following online tool to generate HTTP code from a CURL command
  //  Convert a cURL Command to HTTP Source Code

  //  Use this online tool to generate code from sample JSON:
  //  Generate Code to Create JSON

  //  The following JSON is sent in the request body.

  //  {
  //    "prompt": "A cute baby sea otter",
  //    "n": 2,
  //    "size": "1024x1024"
  //  }

  json := TJsonObject.Create;
  json.UpdateString('prompt','A cute baby sea otter');
  json.UpdateInt('n',2);
  json.UpdateString('size','1024x1024');

  //  Adds the "Authorization: Bearer $OPENAI_API_KEY" header.
  //  This is NOT a real key.  Change the "sk-vi...." to your own key.
  http.AuthToken := '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';

  resp := THttpResponse.Create;
  success := http.HttpJson('POST','https://api.openai.com/v1/images/generations',json,'application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  sbResponseBody := TStringBuilder.Create;
  resp.GetBodySb(sbResponseBody);

  jResp := TJsonObject.Create;
  jResp.LoadSb(sbResponseBody);
  jResp.EmitCompact := False;

  WriteLn('Response Body:');
  WriteLn(jResp.Emit());

  respStatusCode := resp.StatusCode;
  WriteLn('Response Status Code = ' + respStatusCode);
  if (respStatusCode >= 400) then
    begin
      WriteLn('Response Header:');
      WriteLn(resp.Header);
      WriteLn('Failed.');
      Exit;
    end;

  //  Sample JSON response:
  //  (Sample code for parsing the JSON response is shown below)

  //  {
  //    "created": 1589478378,
  //    "data": [
  //      {
  //        "url": "https://..."
  //      },
  //      {
  //        "url": "https://..."
  //      }
  //    ]
  //  }

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

  sbLocalFilePath := TStringBuilder.Create;

  //  Download each image..
  http.ClearHeaders();
  http.AuthToken := '';

  created := jResp.IntOf('created');
  i := 0;
  count_i := jResp.SizeOfArray('data');
  while i < count_i do
    begin
      jResp.I := i;
      url := jResp.StringOf('data[i].url');

      sbLocalFilePath.SetString('c:/aaworkarea/image_');
      sbLocalFilePath.AppendInt(i + 1);
      sbLocalFilePath.Append('.png');

      success := http.Download(url,sbLocalFilePath.GetAsString());
      if (success = False) then
        begin
          WriteLn(http.LastErrorText);
          Exit;
        end;

      i := i + 1;
    end;



  http.Free;
  json.Free;
  resp.Free;
  sbResponseBody.Free;
  jResp.Free;
  sbLocalFilePath.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.