Objective-C

Outlook --Download MIME Embedded Images in an HTML Email

See more Outlook Examples

Demonstrates how to download the MIME embedded images for a particular HTML email message.

The code for downloading the embedded HTML images is the same as for downloading attachments. When an HTML email has embedded images (and no real attachments), the JSON returned when listing the message will indicate "hasAttachments": false. However, you can still use the URL for getting attachments to get the embedded images.

Note: This example requires Chilkat v9.5.0.67 or greater.

This example applies to: Exchange Online | Office 365 | Hotmail.com | Live.com | MSN.com | Outlook.com | Passport.com

Objective-C

#import <CkoHttp.h>
#import <CkoStringBuilder.h>
#import <NSString.h>
#import <CkoJsonObject.h>
#import <CkoBinData.h>
#import <CkoDateTime.h>
#import <CkoFileAccess.h>

BOOL success = NO;

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

CkoHttp *http = [[CkoHttp alloc] init];

// 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).

http.AuthToken = @"MICROSOFT_GRAPH_ACCESS_TOKEN";

CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];

// Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
// Note: It is also possible to use the literal string "me" for the current logged-on user.
// For example: GET /me/messages/{message_id}/attachments

[http ClearUrlVars];
[http SetUrlVar: @"userPrincipalName" value: @"chilkatsoft@outlook.com"];

// Assume we already have a message ID from previously listing the messages in a folder
NSString *messageId = @"AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2QAAAA==";
[http SetUrlVar: @"message_id" value: messageId];

// Send the request to download the attachments.  However, this will also download the embedded images. (Who knew???)
success = [http QuickGetSb: @"https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments" sbContent: sbResponse];
if ((success != YES) && ([http.LastStatus intValue] == 0)) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// The attachment data is contained within the JSON response.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json LoadSb: sbResponse];
json.EmitCompact = NO;

NSLog(@"%@%d",@"Status code = ",[http.LastStatus intValue]);
if ([http.LastStatus intValue] != 200) {
    NSLog(@"%@",[json Emit]);
    NSLog(@"%@",@"Failed.");
}

// This is a sample JSON response.  The code for parsing and extracting/saving the MIME images
// is shown below.

// {
//   "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2QAAAA%3D%3D')/attachments",
//   "value": [
//     {
//       "@odata.type": "#microsoft.graph.fileAttachment",
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2QAAAAESABAAgZG0LQdbKEy5FudPGeyRCg==",
//       "lastModifiedDateTime": "2017-05-10T00:22:45Z",
//       "name": "starfish.jpg",
//       "contentType": "image/jpeg",
//       "size": 6497,
//       "isInline": true,
//       "contentId": "part1.A9EACD6E.4E93E87E@chilkatsoft.com",
//       "contentLocation": null,
//       "contentBytes": "/9j/4AAQSkZJRgABAgEASABIAAD/7Q18UGh ... +vo//2Q=="
//     },
//     {
//       "@odata.type": "#microsoft.graph.fileAttachment",
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2QAAAAESABAABRgWReFlhEmqGvKeoT0E6g==",
//       "lastModifiedDateTime": "2017-05-10T00:22:45Z",
//       "name": "hedgehogs.jpg",
//       "contentType": "image/jpeg",
//       "size": 48845,
//       "isInline": true,
//       "contentId": "part2.05D9E5DC.BA8874F4@chilkatsoft.com",
//       "contentLocation": null,
//       "contentBytes": "/9j/4AAQSkZJRg ... 9YEa//AMr/AP/Z"
//     }
//   ]
// }

CkoStringBuilder *sbSavePath = [[CkoStringBuilder alloc] init];
CkoBinData *attachData = [[CkoBinData alloc] init];
CkoDateTime *lastMod = [[CkoDateTime alloc] init];
CkoFileAccess *fac = [[CkoFileAccess alloc] init];

int i = 0;
int numMessages = [[json SizeOfArray: @"value"] intValue];
while (i < numMessages) {
    json.I = [NSNumber numberWithInt: i];

    NSLog(@"%@%@",@"name: ",[json StringOf: @"value[i].name"]);
    // See the note below about the contentId.
    NSLog(@"%@%@",@"contentId: ",[json StringOf: @"value[i].contentId"]);
    NSLog(@"%@%@",@"contentType: ",[json StringOf: @"value[i].contentType"]);
    int sizeInBytes = [[json IntOf: @"value[i].size"] intValue];
    NSLog(@"%@%d",@"size: ",sizeInBytes);

    // Extract the data and save to a file.
    [sbSavePath SetString: @"qa_output/"];
    [sbSavePath Append: [json StringOf: @"value[i].name"]];

    [attachData Clear];
    [attachData AppendEncoded: [json StringOf: @"value[i].contentBytes"] encoding: @"base64"];
    [attachData WriteFile: [sbSavePath GetAsString]];

    // Get the last-modified date/time and set the output file's last-mod date/time..
    [lastMod SetFromTimestamp: [json StringOf: @"value[i].lastModifiedDateTime"]];
    [fac SetLastModified: [sbSavePath GetAsString] lastModified: lastMod];

    NSLog(@"%@",@"----");

    i = i + 1;
}

// The output of the above loop is:

// 	name: starfish.jpg
// 	contentId: part1.A9EACD6E.4E93E87E@chilkatsoft.com
// 	contentType: image/jpeg
// 	size: 6497
// 	----
// 	name: hedgehogs.jpg
// 	contentId: part2.05D9E5DC.BA8874F4@chilkatsoft.com
// 	contentType: image/jpeg
// 	size: 48845
// 	----

// ----------------------------
// NOTE: About the Content-ID
// ----------------------------

// Each image's contentId will correspond to a "cid" in the HTML body of the email.
// For example, in this case, the HTML email contained this:

// 	<html>
// 	<head>
// 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
// 	<meta content="text/html; charset=utf-8">
// 	</head>
// 	<body bgcolor="#FFFFFF">
// 	<font face="Calibri">This is a test email with images.<br>
// 	<br>
// 	<img alt="" src="cid:part1.A9EACD6E.4E93E87E@chilkatsoft.com" height="120" width="120"><br>
// 	<img alt="" src="cid:part2.05D9E5DC.BA8874F4@chilkatsoft.com" height="427" width="600"><br>
// 	</font>
// 	</body>
// 	</html>
//