(Delphi ActiveX) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

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
jsonToken: TChilkatJsonObject;
success: Integer;
gAuth: TChilkatAuthGoogle;
rest: TChilkatRest;
bAutoReconnect: Integer;
sbPath: TChilkatStringBuilder;
contactId: WideString;
numReplacements: Integer;
imageData: TChilkatBinData;
sbResponseBody: TChilkatStringBuilder;
sbContentType: TChilkatStringBuilder;

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

// --------------------------------------------------------------------------------------------------------
// Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
// Once connected, the REST object may be re-used for many REST API calls.
// (It's a good idea to put the connection setup code in a separate function/subroutine.)
// --------------------------------------------------------------------------------------------------------

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file 
// saved by this example: Get Google Contacts OAuth2 Access Token

jsonToken := TChilkatJsonObject.Create(Self);
success := jsonToken.LoadFile('qa_data/tokens/googleContacts.json');
if (success <> 1) then
  begin
    Memo1.Lines.Add('Failed to load googleContacts.json');
    Exit;
  end;

gAuth := TChilkatAuthGoogle.Create(Self);
gAuth.AccessToken := jsonToken.StringOf('access_token');

rest := TChilkatRest.Create(Self);

// Connect using TLS.
bAutoReconnect := 1;
success := rest.Connect('www.google.com',443,1,bAutoReconnect);

// Provide the authentication credentials (i.e. the access token)
rest.SetAuthGoogle(gAuth.ControlInterface);

// ----------------------------------------------
// OK, the REST connection setup is completed..
// ----------------------------------------------

// To get the photo, send the following:

// 	GET /m8/feeds/photos/media/default/contactId

rest.AddHeader('GData-Version','3.0');

sbPath := TChilkatStringBuilder.Create(Self);
// Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
contactId := '1ea2e4fe0ef24e09';
sbPath.SetString('/m8/feeds/photos/media/default/{contactId}');
numReplacements := sbPath.Replace('{contactId}',contactId);

imageData := TChilkatBinData.Create(Self);
success := rest.FullRequestNoBodyBd('GET',sbPath.GetAsString(),imageData.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// A 404 response indicates the contact has no photo.
// (We could've first fetched the contact information, parsed out the 
// photo etag, and then if no photo etag existed, we'd know the contact has no
// photo.  Or... we can just try to download the photo and if a 404 is received,
// we know there's no photo.  Much simpler.)
if (rest.ResponseStatusCode = 404) then
  begin
    Memo1.Lines.Add('This contact has no photo.');
    Exit;
  end;

// A successful response will have a status code equal to 200.
if (rest.ResponseStatusCode <> 200) then
  begin
    // If the response was not successful, then the response body
    // does not contain image data.  Instead it contains XML.
    sbResponseBody := TChilkatStringBuilder.Create(Self);
    sbResponseBody.AppendBd(imageData.ControlInterface,'utf-8',0,0);

    Memo1.Lines.Add('response status code = ' + IntToStr(rest.ResponseStatusCode));
    Memo1.Lines.Add('response status text = ' + rest.ResponseStatusText);
    Memo1.Lines.Add('response header: ' + rest.ResponseHeader);
    Memo1.Lines.Add('response body: ' + sbResponseBody.GetAsString());
    Memo1.Lines.Add('request startline: ' + rest.LastRequestStartLine);
    Memo1.Lines.Add('request header: ' + rest.LastRequestHeader);
    Exit;
  end;

// Examine the content-type in the response header so we know what file
// extension to use (.jpg, .png, etc.)
sbContentType := TChilkatStringBuilder.Create(Self);
sbContentType.Append(rest.ResponseHdrByName('Content-Type'));

if (sbContentType.ContentsEqual('image/jpeg',0) = 1) then
  begin
    imageData.WriteFile('qa_output/contact_photo.jpg');
  end;
if (sbContentType.ContentsEqual('image/png',0) = 1) then
  begin
    imageData.WriteFile('qa_output/contact_photo.png');
  end;

Memo1.Lines.Add('Content-Type: ' + sbContentType.GetAsString());
Memo1.Lines.Add('Success.');
end;