(Unicode C++) Get a List of Message IDs in GMail User's Mailbox

Demonstrates how to get a list of message IDs in a GMail mailbox. The "userId" can be either the user's email address or the special value "me" to indicate the authenticated user.

For more information, see https://developers.google.com/gmail/api/v1/reference/users/messages/list

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <CkHttpW.h>
#include <CkHttpResponseW.h>
#include <CkJsonObjectW.h>

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

    CkHttpW http;

    http.put_AuthToken(L"ACCESS_TOKEN");

    http.put_Accept(L"application/json");

    CkHttpResponseW *resp = http.QuickRequest(L"GET",L"https://www.googleapis.com/gmail/v1/users/userId/messages");
    if (http.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    wprintf(L"Response Status Code: %d\n",resp->get_StatusCode());

    CkJsonObjectW jsonResponse;
    jsonResponse.Load(resp->bodyStr());
    jsonResponse.put_EmitCompact(false);
    wprintf(L"%s\n",jsonResponse.emit());

    if (resp->get_StatusCode() != 200) {
        wprintf(L"Failed.\n");
        delete resp;
        return;
    }

    delete resp;

    // {
    //   "messages": [
    //     users.messages Resource
    //   ],
    //   "nextPageToken": string,
    //   "resultSizeEstimate": unsigned integer
    // }

    // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    // See this example explaining how this memory should be used: const char * functions.

    const wchar_t *id = 0;
    const wchar_t *threadId = 0;

    int resultSizeEstimate = jsonResponse.IntOf(L"resultSizeEstimate");
    int i = 0;
    int count_i = jsonResponse.SizeOfArray(L"messages");
    while (i < count_i) {
        jsonResponse.put_I(i);
        id = jsonResponse.stringOf(L"messages[i].id");
        threadId = jsonResponse.stringOf(L"messages[i].threadId");
        i = i + 1;
    }
    }