C GMail: Get a specific message (format="metadata")

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Gets a specific message using format=metadata.

Documentation: https://developers.google.com/gmail/api/v1/reference/users/messages/get

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

void ChilkatSample(void)
    {
    HCkRest rest;
    BOOL success;
    HCkOAuth2 oauth2;
    HCkStringBuilder sbJson;
    HCkJsonObject json;
    const char *id;
    const char *threadId;
    const char *snippet;
    const char *historyId;
    const char *internalDate;
    const char *payloadMimeType;
    int sizeEstimate;
    int i;
    int count_i;
    const char *strVal;
    const char *name;
    const char *value;

    rest = CkRest_Create();

    //   Provide a previously obtained OAuth2 access token.
    oauth2 = CkOAuth2_Create();
    CkOAuth2_putAccessToken(oauth2,"OAUTH2_ACCESS_TOKEN");
    CkRest_SetAuthOAuth2(rest,oauth2);

    success = CkRest_Connect(rest,"www.googleapis.com",443,TRUE,TRUE);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkOAuth2_Dispose(oauth2);
        return;
    }

    CkRest_AddPathParam(rest,"messageId","15fc23688c553739");

    CkRest_AddQueryParam(rest,"format","metadata");

    sbJson = CkStringBuilder_Create();
    success = CkRest_FullRequestNoBodySb(rest,"GET","/gmail/v1/users/me/messages/messageId",sbJson);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkOAuth2_Dispose(oauth2);
        CkStringBuilder_Dispose(sbJson);
        return;
    }

    if (CkRest_getResponseStatusCode(rest) != 200) {
        printf("Received error response code: %d\n",CkRest_getResponseStatusCode(rest));
        printf("Response body:\n");
        printf("%s\n",CkStringBuilder_getAsString(sbJson));
        CkRest_Dispose(rest);
        CkOAuth2_Dispose(oauth2);
        CkStringBuilder_Dispose(sbJson);
        return;
    }

    json = CkJsonObject_Create();
    CkJsonObject_LoadSb(json,sbJson);

    //  The following code parses the JSON response.
    //  A sample JSON response is shown below the sample code.

    id = CkJsonObject_stringOf(json,"id");
    threadId = CkJsonObject_stringOf(json,"threadId");
    snippet = CkJsonObject_stringOf(json,"snippet");
    historyId = CkJsonObject_stringOf(json,"historyId");
    internalDate = CkJsonObject_stringOf(json,"internalDate");
    payloadMimeType = CkJsonObject_stringOf(json,"payload.mimeType");
    sizeEstimate = CkJsonObject_IntOf(json,"sizeEstimate");
    i = 0;
    count_i = CkJsonObject_SizeOfArray(json,"labelIds");
    while (i < count_i) {
        CkJsonObject_putI(json,i);
        strVal = CkJsonObject_stringOf(json,"labelIds[i]");
        i = i + 1;
    }

    i = 0;
    count_i = CkJsonObject_SizeOfArray(json,"payload.headers");
    while (i < count_i) {
        CkJsonObject_putI(json,i);
        name = CkJsonObject_stringOf(json,"payload.headers[i].name");
        value = CkJsonObject_stringOf(json,"payload.headers[i].value");
        i = i + 1;
    }

    printf("Example Completed.\n");


    CkRest_Dispose(rest);
    CkOAuth2_Dispose(oauth2);
    CkStringBuilder_Dispose(sbJson);
    CkJsonObject_Dispose(json);

    }

Sample JSON Response Body

{
  "id": "15fc23688c553739",
  "threadId": "15fc23688c553739",
  "labelIds": [
    "IMPORTANT",
    "SENT",
    "INBOX"
  ],
  "snippet": "This is a test. \u200b",
  "historyId": "1438",
  "internalDate": "1510791874000",
  "payload": {
    "mimeType": "multipart/mixed",
    "headers": [
      {
        "name": "MIME-Version",
        "value": "1.0"
      },
      {
        "name": "Received",
        "value": "by 10.25.23.105 with HTTP; Wed, 15 Nov 2017 16:24:34 -0800 (PST)"
      },
      {
        "name": "X-Originating-IP",
        "value": "[2601:249:e00:9093:e894:b27f:e5d6:d01d]"
      },
      {
        "name": "Date",
        "value": "Wed, 15 Nov 2017 18:24:34 -0600"
      },
      {
        "name": "Delivered-To",
        "value": "matt@chilkat.io"
      },
      {
        "name": "Message-ID",
        "value": "\u003cCAPhjyBM1qqXS6NVB65W8Zt5-McF03qWSRDjW5am66wTMuard=w@mail.gmail.com\u003e"
      },
      {
        "name": "Subject",
        "value": "Test HTML email with image and attachment."
      },
      {
        "name": "From",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "To",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "Content-Type",
        "value": "multipart/mixed; boundary=\"001a11401a6c097887055e0ea572\""
      }
    ]
  },
  "sizeEstimate": 11716
}