(VB.NET UWP/WinRT) Outlook --Download Attachments for a Specific Message

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Demonstrates how to download the attachments for a particular email message.

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

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Dim http As New Chilkat.Http

' 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"

Dim sbResponse As New Chilkat.StringBuilder

' 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","chilkatsoft@outlook.com")

' Assume we already have a message ID from previously listing the messages in a folder
Dim messageId As String = "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA=="
http.SetUrlVar("message_id",messageId)

' Send the request to download the attachments.
Dim success As Boolean = Await http.QuickGetSbAsync("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments",sbResponse)
If ((success <> True) And (http.LastStatus = 0)) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' The attachment data is contained within the JSON response.
Dim json As New Chilkat.JsonObject
json.LoadSb(sbResponse)
json.EmitCompact = False

Debug.WriteLine("Status code = " & http.LastStatus)
If (http.LastStatus <> 200) Then
    Debug.WriteLine(json.Emit())
    Debug.WriteLine("Failed.")
End If


' 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=="
' 	    }
' 	  ]
' 	}


Dim sbSavePath As New Chilkat.StringBuilder
Dim attachData As New Chilkat.BinData
Dim lastMod As New Chilkat.CkDateTime
Dim fac As New Chilkat.FileAccess

Dim i As Integer = 0
Dim numMessages As Integer = json.SizeOfArray("value")
While i < numMessages
    json.I = i

    Debug.WriteLine("name: " & json.StringOf("value[i].name"))
    Debug.WriteLine("contentType: " & json.StringOf("value[i].contentType"))
    Dim sizeInBytes As Integer = json.IntOf("value[i].size")
    Debug.WriteLine("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"),"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(),lastMod)

    Debug.WriteLine("----")

    i = i + 1
End While

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