Unicode C GMail: Lists the messages in the user's mailbox.

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Lists the messages in the user's mailbox.

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

#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;
    int resultSizeEstimate;
    int i;
    int count_i;
    const wchar_t *id;
    const wchar_t *threadId;

    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;
    }

    sbJson = CkStringBuilderW_Create();
    success = CkRestW_FullRequestNoBodySb(rest,L"GET",L"/gmail/v1/users/me/messages",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.

    resultSizeEstimate = CkJsonObjectW_IntOf(json,L"resultSizeEstimate");
    i = 0;
    count_i = CkJsonObjectW_SizeOfArray(json,L"messages");
    while (i < count_i) {
        CkJsonObjectW_putI(json,i);
        id = CkJsonObjectW_stringOf(json,L"messages[i].id");
        threadId = CkJsonObjectW_stringOf(json,L"messages[i].threadId");
        i = i + 1;
    }

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


    CkRestW_Dispose(rest);
    CkOAuth2W_Dispose(oauth2);
    CkStringBuilderW_Dispose(sbJson);
    CkJsonObjectW_Dispose(json);

    }

Sample JSON Response Body

{
  "messages": [
    {
      "id": "15fc237e79da4174",
      "threadId": "15fc237e79da4174"
    },
    {
      "id": "15fc23688c553739",
      "threadId": "15fc23688c553739"
    },
    {
      "id": "15fbd37d3a8f9950",
      "threadId": "15fbd37d3a8f9950"
    },
    {
      "id": "15fb5e49b822ac1d",
      "threadId": "15fb5e49b822ac1d"
    },
    {
      "id": "15fb5e49b7a0739b",
      "threadId": "15fb5e49b7a0739b"
    }
  ],
  "resultSizeEstimate": 5
}