(Delphi DLL) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

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, StringBuilder, AuthGoogle, BinData, JsonObject, Rest;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jsonToken: HCkJsonObject;
success: Boolean;
gAuth: HCkAuthGoogle;
rest: HCkRest;
bAutoReconnect: Boolean;
sbPath: HCkStringBuilder;
contactId: PWideChar;
numReplacements: Integer;
imageData: HCkBinData;
sbResponseBody: HCkStringBuilder;
sbContentType: HCkStringBuilder;

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 := CkJsonObject_Create();
success := CkJsonObject_LoadFile(jsonToken,'qa_data/tokens/googleContacts.json');
if (success <> True) then
  begin
    Memo1.Lines.Add('Failed to load googleContacts.json');
    Exit;
  end;

gAuth := CkAuthGoogle_Create();
CkAuthGoogle_putAccessToken(gAuth,CkJsonObject__stringOf(jsonToken,'access_token'));

rest := CkRest_Create();

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

// Provide the authentication credentials (i.e. the access token)
CkRest_SetAuthGoogle(rest,gAuth);

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

// To get the photo, send the following:

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

CkRest_AddHeader(rest,'GData-Version','3.0');

sbPath := CkStringBuilder_Create();
// Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
contactId := '1ea2e4fe0ef24e09';
CkStringBuilder_SetString(sbPath,'/m8/feeds/photos/media/default/{contactId}');
numReplacements := CkStringBuilder_Replace(sbPath,'{contactId}',contactId);

imageData := CkBinData_Create();
success := CkRest_FullRequestNoBodyBd(rest,'GET',CkStringBuilder__getAsString(sbPath),imageData);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    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 (CkRest_getResponseStatusCode(rest) = 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 (CkRest_getResponseStatusCode(rest) <> 200) then
  begin
    // If the response was not successful, then the response body
    // does not contain image data.  Instead it contains XML.
    sbResponseBody := CkStringBuilder_Create();
    CkStringBuilder_AppendBd(sbResponseBody,imageData,'utf-8',0,0);

    Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
    Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
    Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
    Memo1.Lines.Add('response body: ' + CkStringBuilder__getAsString(sbResponseBody));
    Memo1.Lines.Add('request startline: ' + CkRest__lastRequestStartLine(rest));
    Memo1.Lines.Add('request header: ' + CkRest__lastRequestHeader(rest));
    Exit;
  end;

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

if (CkStringBuilder_ContentsEqual(sbContentType,'image/jpeg',False) = True) then
  begin
    CkBinData_WriteFile(imageData,'qa_output/contact_photo.jpg');
  end;
if (CkStringBuilder_ContentsEqual(sbContentType,'image/png',False) = True) then
  begin
    CkBinData_WriteFile(imageData,'qa_output/contact_photo.png');
  end;

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

CkJsonObject_Dispose(jsonToken);
CkAuthGoogle_Dispose(gAuth);
CkRest_Dispose(rest);
CkStringBuilder_Dispose(sbPath);
CkBinData_Dispose(imageData);
    CkStringBuilder_Dispose(sbResponseBody);
CkStringBuilder_Dispose(sbContentType);

end;