(C) Read a Single Facebook Post

Demonstrates how to read the contents of a single Facebook post. A post is an individual entry in a profile's feed. The profile could be a user, page, app, or group.

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#include <C_CkOAuth2.h>
#include <C_CkRest.h>
#include <C_CkStringBuilder.h>
#include <C_CkJsonObject.h>
#include <C_CkDateTime.h>
#include <C_CkDtObj.h>

void ChilkatSample(void)
    {
    HCkOAuth2 oauth2;
    HCkRest rest;
    BOOL success;
    const char *postId;
    HCkStringBuilder sbPath;
    const char *responseJson;
    HCkJsonObject json;
    HCkDateTime dtime;
    BOOL bLocalTime;
    HCkDtObj dt;

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

    // This example assumes a previously obtained an access token
    oauth2 = CkOAuth2_Create();
    CkOAuth2_putAccessToken(oauth2,"FACEBOOK-ACCESS-TOKEN");

    rest = CkRest_Create();

    // Connect to Facebook...
    success = CkRest_Connect(rest,"graph.facebook.com",443,TRUE,TRUE);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkOAuth2_Dispose(oauth2);
        CkRest_Dispose(rest);
        return;
    }

    // Provide the authentication credentials (i.e. the access key)
    CkRest_SetAuthOAuth2(rest,oauth2);

    // This example assumes a post id was already retrieved.
    // For example, it could've been retrieved by reading the user's feed:
    // See Parsing the Facebook User Feed for code showing how to parse the JSON feed content.

    postId = "10224048320139890_10210156138515282";

    sbPath = CkStringBuilder_Create();
    CkStringBuilder_Append(sbPath,"/v2.7/");
    CkStringBuilder_Append(sbPath,postId);

    // Select the fields we want.
    // This example will select almost all the possible fields.
    // See https://developers.facebook.com/docs/graph-api/reference/post/
    CkRest_AddQueryParam(rest,"fields","id,message,created_time,caption,description,from,link,name,object_id,picture,place,privacy,properties,shares,source,status_type,story,targeting,to,type,updated_time,with_tags");

    responseJson = CkRest_fullRequestNoBody(rest,"GET",CkStringBuilder_getAsString(sbPath));
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkOAuth2_Dispose(oauth2);
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbPath);
        return;
    }

    json = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(json,FALSE);
    CkJsonObject_Load(json,responseJson);

    // Show the JSON in human-readable format.
    printf("%s\n",CkJsonObject_emit(json));

    // A sample JSON response is shown here.  
    // { 
    //   "id": "12345678901234567_12345678900000004",
    //   "message": "Ignore my posts -- I'm doing some testing for Facebook related programming...",
    //   "created_time": "2016-09-29T20:46:18+0000",
    //   "from": { 
    //     "name": "John Doe",
    //     "id": "12345678901234567"
    //   },
    //   "link": "https:\/\/www.facebook.com\/photo.php?fbid=10210199026247451&set=a.1237223526054.2038240.1094202869&type=3",
    //   "object_id": "10210139026347451",
    //   "picture": "https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-9\/14462791_10210199026647451_7830642117574407060_n.jpg?oh=a7f9ed10ce9cd81a82adeb541c60e2e2&oe=58ABB195",
    //   "privacy": { 
    //     "allow": "",
    //     "deny": "",
    //     "description": "Public",
    //     "friends": "",
    //     "value": "EVERYONE"
    //   },
    //   "status_type": "added_photos",
    //   "type": "photo",
    //   "updated_time": "2016-09-29T20:46:18+0000"
    // }

    // This is the code to parse some fields in the JSON response.
    printf("type: %s\n",CkJsonObject_stringOf(json,"type"));
    printf("message: %s\n",CkJsonObject_stringOf(json,"message"));
    printf("id: %s\n",CkJsonObject_stringOf(json,"id"));
    printf("link: %s\n",CkJsonObject_stringOf(json,"link"));
    printf("privacy descripton: %s\n",CkJsonObject_stringOf(json,"privacy.description"));

    dtime = CkDateTime_Create();
    bLocalTime = TRUE;
    CkDateTime_SetFromTimestamp(dtime,CkJsonObject_stringOf(json,"created_time"));
    dt = CkDateTime_GetDtObj(dtime,bLocalTime);
    printf("%d/%d/%d  %d:%d\n",CkDtObj_getMonth(dt),CkDtObj_getDay(dt),CkDtObj_getYear(dt),CkDtObj_getHour(dt),CkDtObj_getMinute(dt));
    CkDtObj_Dispose(dt);


    CkOAuth2_Dispose(oauth2);
    CkRest_Dispose(rest);
    CkStringBuilder_Dispose(sbPath);
    CkJsonObject_Dispose(json);
    CkDateTime_Dispose(dtime);

    }