Pascal (Lazarus/Delphi)
Pascal (Lazarus/Delphi)
Google Contacts - Retrieve as JSON
See more Google APIs Examples
Demonstrates how to retrieve Google Contacts as JSON.Chilkat Pascal (Lazarus/Delphi) Downloads
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.StringBuilder,
Chilkat.AuthGoogle,
Chilkat.JsonObject,
Chilkat.Rest;
// ---------------------------------------------------------------------------
procedure RunDemo;
var
success: Boolean;
jsonToken: TJsonObject;
gAuth: TAuthGoogle;
rest: TRest;
bAutoReconnect: Boolean;
sbResponseBody: TStringBuilder;
json: TJsonObject;
totalResults: Integer;
startIndex: Integer;
itemsPerPage: Integer;
numEntries: Integer;
i: Integer;
fullName: string;
numEmailAddresses: Integer;
j: Integer;
emailAddress: string;
begin
success := False;
// 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 := TJsonObject.Create;
success := jsonToken.LoadFile('qa_data/tokens/googleContacts.json');
if (success <> True) then
begin
WriteLn('Failed to load googleContacts.json');
Exit;
end;
gAuth := TAuthGoogle.Create;
gAuth.AccessToken := jsonToken.StringOf('access_token');
rest := TRest.Create;
// Connect using TLS.
bAutoReconnect := True;
success := rest.Connect('www.google.com',443,True,bAutoReconnect);
// Provide the authentication credentials (i.e. the access token)
rest.SetAuthGoogle(gAuth);
// ----------------------------------------------
// OK, the REST connection setup is completed..
// ----------------------------------------------
// To retrieve the contacts, we need to send the following:
// GET /m8/feeds/contacts/default/full
// GData-Version: 3.0
// To get the contacts data in JSON format, set the "alt" query parameter to "json"
rest.AddQueryParam('alt','json');
rest.AddHeader('GData-Version','3.0');
sbResponseBody := TStringBuilder.Create;
success := rest.FullRequestNoBodySb('GET','/m8/feeds/contacts/default/full',sbResponseBody);
if (success <> True) then
begin
WriteLn(rest.LastErrorText);
Exit;
end;
// A successful response will have a status code equal to 200.
if (rest.ResponseStatusCode <> 200) then
begin
WriteLn('response status code = ' + rest.ResponseStatusCode);
WriteLn('response status text = ' + rest.ResponseStatusText);
WriteLn('response header: ' + rest.ResponseHeader);
WriteLn('response body: ' + sbResponseBody.GetAsString());
Exit;
end;
// If the 200 response was received, then the contacts JSON is contained
// in the response body.
json := TJsonObject.Create;
json.LoadSb(sbResponseBody);
json.EmitCompact := False;
// Save the pretty-printed JSON response to a file.
sbResponseBody.Clear();
json.EmitSb(sbResponseBody);
sbResponseBody.WriteFile('qa_output/google_contacts.json','utf-8',False);
// Parse the Google Contacts JSON, and iterate over the contacts..
totalResults := json.IntOf('feed.openSearch$totalResults.$t');
startIndex := json.IntOf('feed.openSearch$startIndex.$t');
itemsPerPage := json.IntOf('feed.openSearch$itemsPerPage.$t');
WriteLn('totalResults = ' + totalResults);
WriteLn('startIndex = ' + startIndex);
WriteLn('itemsPerPage = ' + itemsPerPage);
numEntries := json.SizeOfArray('feed.entry');
i := 0;
while i < numEntries do
begin
json.I := i;
WriteLn(i + 1 + ' ----');
WriteLn('title: ' + json.StringOf('feed.entry[i].title.$t'));
fullName := json.StringOf('feed.entry[i].gd$name.gd$fullName.$t');
if (json.LastMethodSuccess = True) then
begin
WriteLn('fullName: ' + fullName);
end;
// There can be multiple email addresses, so it's stored as a JSON array..
numEmailAddresses := json.SizeOfArray('feed.entry[i].gd$email');
j := 0;
while j < numEmailAddresses do
begin
emailAddress := json.StringOf('feed.entry[i].gd$email[j].address');
if (json.LastMethodSuccess = True) then
begin
WriteLn('email address: ' + emailAddress);
end;
j := j + 1;
end;
i := i + 1;
end;
// A sample Google Contacts JSON response:
// {
// "version": "1.0",
// "encoding": "UTF-8",
// "feed": {
// "xmlns": "http://www.w3.org/2005/Atom",
// "xmlns$openSearch": "http://a9.com/-/spec/opensearch/1.1/",
// "xmlns$gContact": "http://schemas.google.com/contact/2008",
// "xmlns$batch": "http://schemas.google.com/gdata/batch",
// "xmlns$gd": "http://schemas.google.com/g/2005",
// "gd$etag": "\"QHw5eTVSLyt7I2A9XRFaE0kNTwI.\"",
// "id": {
// "$t": "chilkat.support@gmail.com"
// },
// "updated": {
// "$t": "2016-11-17T01:57:41.221Z"
// },
// "category": [
// {
// "scheme": "http://schemas.google.com/g/2005#kind",
// "term": "http://schemas.google.com/contact/2008#contact"
// }
// ],
// "title": {
// "$t": "Chilkat Support's Contacts"
// },
// "link": [
// {
// "rel": "alternate",
// "type": "text/html",
// "href": "https://www.googleapis.com/"
// },
// {
// "rel": "http://schemas.google.com/g/2005#feed",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full"
// },
// {
// "rel": "http://schemas.google.com/g/2005#post",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full"
// },
// {
// "rel": "http://schemas.google.com/g/2005#batch",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full/batch"
// },
// {
// "rel": "self",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full?max-results=25&alt=json"
// },
// {
// "rel": "next",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full?max-results=25&alt=json&start-index=26"
// }
// ],
// "author": [
// {
// "name": {
// "$t": "Chilkat Support"
// },
// "email": {
// "$t": "chilkat.support@gmail.com"
// }
// }
// ],
// "generator": {
// "version": "1.0",
// "uri": "http://www.google.com/m8/feeds",
// "$t": "Contacts"
// },
// "openSearch$totalResults": {
// "$t": "350"
// },
// "openSearch$startIndex": {
// "$t": "1"
// },
// "openSearch$itemsPerPage": {
// "$t": "25"
// },
// "entry": [
// {
// "id": {
// "$t": "http://www.google.com/m8/feeds/contacts/chilkat.support%40gmail.com/base/0"
// },
// "gd$etag": "\"SX8zcTVSLyt7I2A9WxBXFU4MQwI.\"",
// "updated": {
// "$t": "2010-01-26T20:07:48.189Z"
// },
// "app$edited": {
// "xmlns$app": "http://www.w3.org/2007/app",
// "$t": "2010-01-26T20:07:48.189Z"
// },
// "category": [
// {
// "scheme": "http://schemas.google.com/g/2005#kind",
// "term": "http://schemas.google.com/contact/2008#contact"
// }
// ],
// "title": {
// "$t": "Joe Sample"
// },
// "link": [
// {
// "rel": "http://schemas.google.com/contacts/2008/rel#photo",
// "type": "image/*",
// "href": "https://www.googleapis.com/m8/feeds/photos/media/chilkat.support%40gmail.com/0"
// },
// {
// "rel": "self",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full/0"
// },
// {
// "rel": "edit",
// "type": "application/atom+xml",
// "href": "https://www.googleapis.com/m8/feeds/contacts/chilkat.support%40gmail.com/full/0"
// }
// ],
// "gd$name": {
// "gd$fullName": {
// "$t": "Joe Sample"
// },
// "gd$givenName": {
// "$t": "Joe"
// },
// "gd$familyName": {
// "$t": "Sample"
// }
// },
// "gd$email": [
// {
// "address": "somebody@gmail.com",
// "primary": "true",
// "rel": "http://schemas.google.com/g/2005#other"
// }
// ]
// },
// ... more entries ...
// }
jsonToken.Free;
gAuth.Free;
rest.Free;
sbResponseBody.Free;
json.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.