(MFC) 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++ Libs

See Also: Using MFC CString in Chilkat

#include <CkHttp.h>
#include <CkHttpResponse.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkHttp http;

    http.put_AuthToken("ACCESS_TOKEN");

    http.put_Accept("application/json");

    CkHttpResponse *resp = http.QuickRequest("GET","https://www.googleapis.com/gmail/v1/users/userId/messages");
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Response Status Code: ");
    strOut.appendInt(resp->get_StatusCode());
    strOut.append("\r\n");

    CkJsonObject jsonResponse;
    jsonResponse.Load(resp->bodyStr());
    jsonResponse.put_EmitCompact(false);
    strOut.append(jsonResponse.emit());
    strOut.append("\r\n");

    if (resp->get_StatusCode() != 200) {
        strOut.append("Failed.");
        strOut.append("\r\n");
        delete resp;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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 char *id = 0;
    const char *threadId = 0;

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



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }