Unicode C

GMail SMTP Send using Previously Obtained OAuth2 Access Token

See more GMail SMTP/IMAP/POP Examples

Demonstrates how to send email using GMail and OAuth2 authentication. This example assumes an OAuth2 access token was previously obtained. Unicode C

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

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObjectW json;
    const wchar_t *accessToken;
    HCkMailManW mailman;
    HCkEmailW email;

    success = FALSE;

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

    // See Get GMail SMTP Access Token 
    // for sample code showing how to obtain a GMail SMTP access token for desktop apps.

    // In this example, our access token was previously saved to the following file which contains JSON like this:
    // 	{
    // 	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
    // 	 "token_type": "Bearer",
    // 	 "expires_in": 3600,
    // 	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
    // 	}
    // 
    json = CkJsonObjectW_Create();
    success = CkJsonObjectW_LoadFile(json,L"qa_data/tokens/_gmailSmtp.json");
    if (success != TRUE) {
        wprintf(L"Failed to load GMail access token file.\n");
        CkJsonObjectW_Dispose(json);
        return;
    }

    accessToken = CkJsonObjectW_stringOf(json,L"access_token");

    mailman = CkMailManW_Create();

    // Set the properties for the GMail SMTP server:
    CkMailManW_putSmtpHost(mailman,L"smtp.gmail.com");
    CkMailManW_putSmtpPort(mailman,587);
    CkMailManW_putStartTLS(mailman,TRUE);

    // The SMTP username should be the GMail address of the user's account that authorized your app to send email.
    CkMailManW_putSmtpUsername(mailman,L"chilkat.support@gmail.com");
    CkMailManW_putOAuth2AccessToken(mailman,accessToken);

    // Create a new email object
    email = CkEmailW_Create();

    CkEmailW_putSubject(email,L"This is a test");
    CkEmailW_putBody(email,L"This is a test");
    CkEmailW_putFrom(email,L"Chilkat <chilkat.support@gmail.com>");
    CkEmailW_AddTo(email,L"Chilkat Admin",L"admin@chilkatsoft.com");
    // To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

    // Call SendEmail to connect to the SMTP server and send.
    // The connection (i.e. session) to the SMTP server remains
    // open so that subsequent SendEmail calls may use the
    // same connection.  
    success = CkMailManW_SendEmail(mailman,email);
    if (success != TRUE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkJsonObjectW_Dispose(json);
        CkMailManW_Dispose(mailman);
        CkEmailW_Dispose(email);
        return;
    }

    // You may close the connection here.  If the connection is kept open, 
    // the next call to mailman.SendEmail will continue using the already-established connection
    // (and automatically re-connect if needed).
    success = CkMailManW_CloseSmtpConnection(mailman);
    if (success != TRUE) {
        wprintf(L"Connection to SMTP server not closed cleanly.\n");
    }

    wprintf(L"Email Sent via GMail with OAuth2 authentication.\n");


    CkJsonObjectW_Dispose(json);
    CkMailManW_Dispose(mailman);
    CkEmailW_Dispose(email);

    }