Unicode C

POP3 GMail XOAUTH2 Authentication

See more GMail SMTP/IMAP/POP Examples

Demonstrates using OAuth2 authentication with pop.gmail.com.

Note: This example requires Chilkat v9.5.0.83 or greater.

Unicode C

#include <C_CkMailManW.h>
#include <C_CkJsonObjectW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMailManW mailman;
    HCkJsonObjectW jsonToken;
    int numEmails;

    success = FALSE;

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

    mailman = CkMailManW_Create();

    CkMailManW_putMailHost(mailman,L"pop.gmail.com");
    CkMailManW_putMailPort(mailman,995);
    CkMailManW_putPopSsl(mailman,TRUE);

    CkMailManW_putPopUsername(mailman,L"my_account@gmail.com");

    //  If using OAuth2 authentication, leave the password empty.
    CkMailManW_putPopPassword(mailman,L"");

    //  Load our previously obtained OAuth2 access token.
    //  See Getting a GMail POP3 OAuth2 Access Token
    jsonToken = CkJsonObjectW_Create();
    success = CkJsonObjectW_LoadFile(jsonToken,L"qa_data/tokens/gmail_pop3.json");
    if (success == FALSE) {
        wprintf(L"%s\n",CkJsonObjectW_lastErrorText(jsonToken));
        CkMailManW_Dispose(mailman);
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    CkMailManW_putOAuth2AccessToken(mailman,CkJsonObjectW_stringOf(jsonToken,L"access_token"));

    //  Make the TLS connection to the POP3 server.
    success = CkMailManW_Pop3Connect(mailman);
    if (success != TRUE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    //  Authenticate..
    success = CkMailManW_Pop3Authenticate(mailman);
    if (success != TRUE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    //  Find out how many emails are on the server..
    numEmails = CkMailManW_CheckMail(mailman);
    if (numEmails < 0) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    //  Examine the POP3 session log:
    wprintf(L"%s\n",CkMailManW_pop3SessionLog(mailman));

    //  The POP3 session log will look something like this:

    //  **** Connected to pop.gmail.com:995
    //  < +OK Gpop ready for requests from 87.9.200.42 l16mb86351205iok
    //  > AUTH XOAUTH2 dXNlcj1....VaMDJFAQE=
    //  < +OK Welcome.
    //  > STAT
    //  < +OK 301 1627357
    //  
    //  -- Finished.

    //  End the POP3 session and close the connection to the GMail server.
    success = CkMailManW_Pop3EndSession(mailman);
    if (success != TRUE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    wprintf(L"-- Finished.\n");


    CkMailManW_Dispose(mailman);
    CkJsonObjectW_Dispose(jsonToken);

    }