Unicode C
Unicode C
Google Contacts - Retrieve as JSON
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Demonstrates how to retrieve Google Contacts as JSON.Chilkat Unicode C Downloads
#include <C_CkJsonObjectW.h>
#include <C_CkAuthGoogleW.h>
#include <C_CkRestW.h>
#include <C_CkStringBuilderW.h>
void ChilkatSample(void)
{
BOOL success;
HCkJsonObjectW jsonToken;
HCkAuthGoogleW gAuth;
HCkRestW rest;
BOOL bAutoReconnect;
HCkStringBuilderW sbResponseBody;
HCkJsonObjectW json;
int totalResults;
int startIndex;
int itemsPerPage;
int numEntries;
int i;
const wchar_t *fullName;
int numEmailAddresses;
int j;
const wchar_t *emailAddress;
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 = CkJsonObjectW_Create();
success = CkJsonObjectW_LoadFile(jsonToken,L"qa_data/tokens/googleContacts.json");
if (success != TRUE) {
wprintf(L"Failed to load googleContacts.json\n");
CkJsonObjectW_Dispose(jsonToken);
return;
}
gAuth = CkAuthGoogleW_Create();
CkAuthGoogleW_putAccessToken(gAuth,CkJsonObjectW_stringOf(jsonToken,L"access_token"));
rest = CkRestW_Create();
// Connect using TLS.
bAutoReconnect = TRUE;
success = CkRestW_Connect(rest,L"www.google.com",443,TRUE,bAutoReconnect);
// Provide the authentication credentials (i.e. the access token)
CkRestW_SetAuthGoogle(rest,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"
CkRestW_AddQueryParam(rest,L"alt",L"json");
CkRestW_AddHeader(rest,L"GData-Version",L"3.0");
sbResponseBody = CkStringBuilderW_Create();
success = CkRestW_FullRequestNoBodySb(rest,L"GET",L"/m8/feeds/contacts/default/full",sbResponseBody);
if (success != TRUE) {
wprintf(L"%s\n",CkRestW_lastErrorText(rest));
CkJsonObjectW_Dispose(jsonToken);
CkAuthGoogleW_Dispose(gAuth);
CkRestW_Dispose(rest);
CkStringBuilderW_Dispose(sbResponseBody);
return;
}
// A successful response will have a status code equal to 200.
if (CkRestW_getResponseStatusCode(rest) != 200) {
wprintf(L"response status code = %d\n",CkRestW_getResponseStatusCode(rest));
wprintf(L"response status text = %s\n",CkRestW_responseStatusText(rest));
wprintf(L"response header: %s\n",CkRestW_responseHeader(rest));
wprintf(L"response body: %s\n",CkStringBuilderW_getAsString(sbResponseBody));
CkJsonObjectW_Dispose(jsonToken);
CkAuthGoogleW_Dispose(gAuth);
CkRestW_Dispose(rest);
CkStringBuilderW_Dispose(sbResponseBody);
return;
}
// If the 200 response was received, then the contacts JSON is contained
// in the response body.
json = CkJsonObjectW_Create();
CkJsonObjectW_LoadSb(json,sbResponseBody);
CkJsonObjectW_putEmitCompact(json,FALSE);
// Save the pretty-printed JSON response to a file.
CkStringBuilderW_Clear(sbResponseBody);
CkJsonObjectW_EmitSb(json,sbResponseBody);
CkStringBuilderW_WriteFile(sbResponseBody,L"qa_output/google_contacts.json",L"utf-8",FALSE);
// Parse the Google Contacts JSON, and iterate over the contacts..
totalResults = CkJsonObjectW_IntOf(json,L"feed.openSearch$totalResults.$t");
startIndex = CkJsonObjectW_IntOf(json,L"feed.openSearch$startIndex.$t");
itemsPerPage = CkJsonObjectW_IntOf(json,L"feed.openSearch$itemsPerPage.$t");
wprintf(L"totalResults = %d\n",totalResults);
wprintf(L"startIndex = %d\n",startIndex);
wprintf(L"itemsPerPage = %d\n",itemsPerPage);
numEntries = CkJsonObjectW_SizeOfArray(json,L"feed.entry");
i = 0;
while (i < numEntries) {
CkJsonObjectW_putI(json,i);
wprintf(L"%d ----\n",i + 1);
wprintf(L"title: %s\n",CkJsonObjectW_stringOf(json,L"feed.entry[i].title.$t"));
fullName = CkJsonObjectW_stringOf(json,L"feed.entry[i].gd$name.gd$fullName.$t");
if (CkJsonObjectW_getLastMethodSuccess(json) == TRUE) {
wprintf(L"fullName: %s\n",fullName);
}
// There can be multiple email addresses, so it's stored as a JSON array..
numEmailAddresses = CkJsonObjectW_SizeOfArray(json,L"feed.entry[i].gd$email");
j = 0;
while (j < numEmailAddresses) {
emailAddress = CkJsonObjectW_stringOf(json,L"feed.entry[i].gd$email[j].address");
if (CkJsonObjectW_getLastMethodSuccess(json) == TRUE) {
wprintf(L"email address: %s\n",emailAddress);
}
j = j + 1;
}
i = i + 1;
}
// 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 ...
//
CkJsonObjectW_Dispose(jsonToken);
CkAuthGoogleW_Dispose(gAuth);
CkRestW_Dispose(rest);
CkStringBuilderW_Dispose(sbResponseBody);
CkJsonObjectW_Dispose(json);
}