(C) Outlook Send Email using MIME Format

See more Outlook Examples

This example sends an email using MIME format via the Microsoft Graph Outlook REST API.

For more information, see https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http#example-4-send-a-new-message-using-mime-format

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#include <C_CkHttp.h>
#include <C_CkJsonObject.h>
#include <C_CkEmail.h>
#include <C_CkStringBuilder.h>
#include <C_CkBinData.h>
#include <C_CkHttpResponse.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    HCkJsonObject jsonToken;
    BOOL success;
    HCkEmail email;
    const char *contentIdStarfish;
    HCkStringBuilder sbHtml;
    int numReplacements;
    const char *content;
    HCkBinData bdMime;
    HCkStringBuilder sbBase64;
    HCkHttpResponse resp;
    HCkJsonObject json;

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

    http = CkHttp_Create();

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    jsonToken = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/microsoftGraph.json");
    if (success == FALSE) {
        printf("%s\n",CkJsonObject_lastErrorText(jsonToken));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(jsonToken);
        return;
    }

    CkHttp_putAuthToken(http,CkJsonObject_stringOf(jsonToken,"access_token"));

    // To send email, we'll POST to the following endpoint:
    // 
    // POST /users/{id | userPrincipalName}/sendMail
    // 
    // (The special keyword "me" may be used in place of a principal name.)
    // 

    // The body of the POST request will contain the MIME source of the email in base64 format.

    // Create a new email object
    email = CkEmail_Create();
    CkEmail_putSubject(email,"Test Outlook API to Send HTML Email with Attachments");
    CkEmail_putFrom(email,"Mary <mary@somewhere.com>");
    CkEmail_AddTo(email,"Joe","joe@example.com");

    // Add a plain-text alternative body, which will likely never be seen.
    // (It is shown if the receiving email client is incapable of displaying HTML email.)
    CkEmail_AddPlainTextAlternativeBody(email,"This is a plain-text alternative body...");

    // Our HTML will include an image, so add the related image here.
    contentIdStarfish = CkEmail_addRelatedFile(email,"qa_data/jpg/starfish.jpg");
    if (CkEmail_getLastMethodSuccess(email) != TRUE) {
        printf("%s\n",CkEmail_lastErrorText(email));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(jsonToken);
        CkEmail_Dispose(email);
        return;
    }

    // The src attribute for the image tag is set to the contentIdStarfish:
    sbHtml = CkStringBuilder_Create();
    CkStringBuilder_Append(sbHtml,"<html><body><p>This is an HTML email with an embedded image.</p>");
    CkStringBuilder_Append(sbHtml,"<p><img src=\"cid:CONTENT_ID_STARFISH\" /></p></body></html>");
    numReplacements = CkStringBuilder_Replace(sbHtml,"CONTENT_ID_STARFISH",contentIdStarfish);

    CkEmail_AddHtmlAlternativeBody(email,CkStringBuilder_getAsString(sbHtml));

    // Finally, add some attachments to the email.
    // Add a file attachment.
    success = CkEmail_AddFileAttachment2(email,"qa_data/pdf/fishing.pdf","application/pdf");
    if (success != TRUE) {
        printf("%s\n",CkEmail_lastErrorText(email));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(jsonToken);
        CkEmail_Dispose(email);
        CkStringBuilder_Dispose(sbHtml);
        return;
    }

    // Add an attachment where the content is contained in a string.
    content = "This is the content of the 2nd attached file.";
    CkEmail_AddStringAttachment(email,"someText.txt",content);

    // Get the email as multi-line base64..
    bdMime = CkBinData_Create();
    CkEmail_GetMimeBd(email,bdMime);

    // Now get it as multi-line base64
    sbBase64 = CkStringBuilder_Create();
    CkBinData_GetEncodedSb(bdMime,"base64_mime",sbBase64);

    // Send the HTTP POST (i.e. send the email)
    resp = CkHttp_PTextSb(http,"POST","https://graph.microsoft.com/v1.0/me/sendMail",sbBase64,"utf-8","text/plain",FALSE,FALSE);
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkJsonObject_Dispose(jsonToken);
        CkEmail_Dispose(email);
        CkStringBuilder_Dispose(sbHtml);
        CkBinData_Dispose(bdMime);
        CkStringBuilder_Dispose(sbBase64);
        return;
    }

    // The send succeeded if the response status code = 202.
    // In the success case, there is no response body.  (We just get the response code to know that it succeeded.)
    if (CkHttpResponse_getStatusCode(resp) != 202) {
        json = CkJsonObject_Create();
        CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));
        CkJsonObject_putEmitCompact(json,FALSE);
        printf("%s\n",CkJsonObject_emit(json));
        printf("Failed, response status code = %d\n",CkHttpResponse_getStatusCode(resp));
    }
    else {
        printf("Outlook Mail Sent.\n");
    }

    CkHttpResponse_Dispose(resp);


    CkHttp_Dispose(http);
    CkJsonObject_Dispose(jsonToken);
    CkEmail_Dispose(email);
    CkStringBuilder_Dispose(sbHtml);
    CkBinData_Dispose(bdMime);
    CkStringBuilder_Dispose(sbBase64);
    CkJsonObject_Dispose(json);

    }