Swift
Outlook --Download Attachments for a Specific Message

Demonstrates how to download the attachments for a particular email message.
Note: This example requires Chilkat v9.5.0.67 or greater.
Chilkat Swift Downloads

Swift

func chilkatTest() {
    var success: Bool = false

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

    let http = CkoHttp()!

    // 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"

    let sbResponse = CkoStringBuilder()!

    // 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(name: "userPrincipalName", value: "chilkatsoft@outlook.com")

    // Assume we already have a message ID from previously listing the messages in a folder
    var messageId: String? = "AAMkADYzZWE3YmZmLWU0YzgtNGNkZC04MGE1LWFiYTFlNTRlY2QwYQBGAAAAAAAu7cUXL5YOTrdsUIw7-v8FBwBUcG0qWqkmQYqWLHQataQxAACnwqJUAABUcG0qWqkmQYqWLHQataQxAACnwrnOAAA="
    http.setUrlVar(name: "message_id", value: messageId)

    // Send the request to download the attachments.
    success = http.quickGetSb(url: "https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments", sbContent: sbResponse)
    if (success != true) && (http.lastStatus.intValue == 0) {
        print("\(http.lastErrorText!)")
        return
    }

    // The attachment data is contained within the JSON response.
    let json = CkoJsonObject()!
    json.loadSb(sb: sbResponse)
    json.emitCompact = false

    print("Status code = \(http.lastStatus.intValue)")
    if http.lastStatus.intValue != 200 {
        print("\(json.emit()!)")
        print("Failed.")
    }

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

    // 	{
    // 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA%3D%3D')/attachments",
    // 	  "value": [
    // 	    {
    // 	      "@odata.type": "#microsoft.graph.fileAttachment",
    // 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAft6wtbaSJU6sgQLi98DI0Q==",
    // 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    // 	      "name": "fishing.pdf",
    // 	      "contentType": "application/pdf",
    // 	      "size": 295680,
    // 	      "isInline": false,
    // 	      "contentId": "F861B218BE380F44B16933097FDDACFC@namprd20.prod.outlook.com",
    // 	      "contentLocation": null,
    // 	      "contentBytes": "JVBERi0xLjMKJcfsj6 ... yZWYKMjk0MzY5CiUlRU9GCg=="
    // 	    },
    // 	    {
    // 	      "@odata.type": "#microsoft.graph.fileAttachment",
    // 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAXS7qXQ-iRUCYXnhJpN8Ihg==",
    // 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    // 	      "name": "testCert.cer",
    // 	      "contentType": "application/octet-stream",
    // 	      "size": 1674,
    // 	      "isInline": false,
    // 	      "contentId": "5E51FA33EF0F8941ACC8260395CB1A33@namprd20.prod.outlook.com",
    // 	      "contentLocation": null,
    // 	      "contentBytes": "MIIFRjCCBC6gAwIBA ... 7pt3C5w=="
    // 	    }
    // 	  ]
    // 	}

    let sbSavePath = CkoStringBuilder()!
    let attachData = CkoBinData()!
    let lastMod = CkoDateTime()!
    let fac = CkoFileAccess()!

    var i: Int = 0
    var numMessages: Int = json.size(ofArray: "value").intValue
    while i < numMessages {
        json.i = i

        print("name: \(json.string(of: "value[i].name")!)")
        print("contentType: \(json.string(of: "value[i].contentType")!)")
        var sizeInBytes: Int = json.int(of: "value[i].size").intValue
        print("size: \(sizeInBytes)")

        // Extract the data and save to a file.
        sbSavePath.setString(value: "qa_output/")
        sbSavePath.append(value: json.string(of: "value[i].name"))

        attachData.clear()
        attachData.appendEncoded(encData: json.string(of: "value[i].contentBytes"), encoding: "base64")
        attachData.writeFile(path: sbSavePath.getAsString())

        // Get the last-modified date/time and set the output file's last-mod date/time..
        lastMod.set(fromTimestamp: json.string(of: "value[i].lastModifiedDateTime"))
        fac.setLastModified(path: sbSavePath.getAsString(), lastModified: lastMod)

        print("----")

        i = i + 1
    }

    // The output of the above loop is:
    // 
    // 	name: fishing.pdf
    // 	contentType: application/pdf
    // 	size: 295680
    // 	----
    // 	name: testCert.cer
    // 	contentType: application/octet-stream
    // 	size: 1674
    // 	----
    // 

}