(Delphi DLL) WhatsApp - Download/Retrieve Media

Demonstrates how to download media previously uploaded to the WhatsApp Business API client

For more information, see https://developers.facebook.com/docs/whatsapp/api/media#retrieve

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
success: Boolean;
bdResponseBody: HCkBinData;
respStatusCode: Integer;

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

http := CkHttp_Create();

// Implements the following CURL command:

// curl -X GET \
//   https://your-webapp-hostname:your-webapp-port/v1/media/4b5bf27b-8672-4d55-bc21-d096dc200d0f \
//   -H 'Authorization: Bearer your-auth-token' \
//   -o path/filename

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

// Adds the "Authorization: Bearer your-auth-token" header.
CkHttp_putAuthToken(http,'your-auth-token');

bdResponseBody := CkBinData_Create();
success := CkHttp_QuickGetBd(http,'https://your-webapp-hostname:your-webapp-port/v1/media/4b5bf27b-8672-4d55-bc21-d096dc200d0f',bdResponseBody);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;
respStatusCode := CkHttp_getLastStatus(http);
Memo1.Lines.Add('response status code = ' + IntToStr(respStatusCode));
Memo1.Lines.Add('response header = ' + CkHttp__lastResponseHeader(http));

if (respStatusCode <> 200) then
  begin
    Memo1.Lines.Add('Error response body:');
    Memo1.Lines.Add(CkBinData__getString(bdResponseBody,'utf-8'));
    Exit;
  end;
success := CkBinData_WriteFile(bdResponseBody,'path/filename');

CkHttp_Dispose(http);
CkBinData_Dispose(bdResponseBody);

end;