Unicode 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_CkRestW.h>
#include <C_CkOAuth2W.h>
#include <C_CkStringBuilderW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    HCkRestW rest;
    BOOL success;
    HCkOAuth2W oauth2;
    HCkStringBuilderW sbJson;
    HCkJsonObjectW json;
    const wchar_t *id;
    const wchar_t *threadId;
    const wchar_t *snippet;
    const wchar_t *historyId;
    const wchar_t *internalDate;
    const wchar_t *payloadMimeType;
    int sizeEstimate;
    int i;
    int count_i;
    const wchar_t *strVal;
    const wchar_t *name;
    const wchar_t *value;

    rest = CkRestW_Create();

    //   Provide a previously obtained OAuth2 access token.
    oauth2 = CkOAuth2W_Create();
    CkOAuth2W_putAccessToken(oauth2,L"OAUTH2_ACCESS_TOKEN");
    CkRestW_SetAuthOAuth2(rest,oauth2);

    success = CkRestW_Connect(rest,L"www.googleapis.com",443,TRUE,TRUE);
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    CkRestW_AddPathParam(rest,L"messageId",L"15fc23688c553739");

    CkRestW_AddQueryParam(rest,L"format",L"metadata");

    sbJson = CkStringBuilderW_Create();
    success = CkRestW_FullRequestNoBodySb(rest,L"GET",L"/gmail/v1/users/me/messages/messageId",sbJson);
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        CkOAuth2W_Dispose(oauth2);
        CkStringBuilderW_Dispose(sbJson);
        return;
    }

    if (CkRestW_getResponseStatusCode(rest) != 200) {
        wprintf(L"Received error response code: %d\n",CkRestW_getResponseStatusCode(rest));
        wprintf(L"Response body:\n");
        wprintf(L"%s\n",CkStringBuilderW_getAsString(sbJson));
        CkRestW_Dispose(rest);
        CkOAuth2W_Dispose(oauth2);
        CkStringBuilderW_Dispose(sbJson);
        return;
    }

    json = CkJsonObjectW_Create();
    CkJsonObjectW_LoadSb(json,sbJson);

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

    id = CkJsonObjectW_stringOf(json,L"id");
    threadId = CkJsonObjectW_stringOf(json,L"threadId");
    snippet = CkJsonObjectW_stringOf(json,L"snippet");
    historyId = CkJsonObjectW_stringOf(json,L"historyId");
    internalDate = CkJsonObjectW_stringOf(json,L"internalDate");
    payloadMimeType = CkJsonObjectW_stringOf(json,L"payload.mimeType");
    sizeEstimate = CkJsonObjectW_IntOf(json,L"sizeEstimate");
    i = 0;
    count_i = CkJsonObjectW_SizeOfArray(json,L"labelIds");
    while (i < count_i) {
        CkJsonObjectW_putI(json,i);
        strVal = CkJsonObjectW_stringOf(json,L"labelIds[i]");
        i = i + 1;
    }

    i = 0;
    count_i = CkJsonObjectW_SizeOfArray(json,L"payload.headers");
    while (i < count_i) {
        CkJsonObjectW_putI(json,i);
        name = CkJsonObjectW_stringOf(json,L"payload.headers[i].name");
        value = CkJsonObjectW_stringOf(json,L"payload.headers[i].value");
        i = i + 1;
    }

    wprintf(L"Example Completed.\n");


    CkRestW_Dispose(rest);
    CkOAuth2W_Dispose(oauth2);
    CkStringBuilderW_Dispose(sbJson);
    CkJsonObjectW_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
}