(Excel) Outlook -- Create Map of Folder Paths to IDs

Recursively descends folders and creates a hashtable of folder paths to IDs. This can be done once at the start of your program (or even less if the map is persisted to a file or database).

The reason this is necessary is because folder ID's need to be passed to the Outlook API, and an application will typically be working with folder paths.

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

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

Dim http As Chilkat.Http
Set http = Chilkat.NewHttp

' Our folder path --> ID map will be stored in this hash table.
Dim folderMap As Chilkat.Hashtable
Set folderMap = Chilkat.NewHashtable

' 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 Chilkat.StringBuilder
Set sbResponse = Chilkat.NewStringBuilder

' Begin by getting the top-level folders.
http.ClearUrlVars 
Dim success As Boolean
success = http.SetUrlVar("userPrincipalName","chilkatsoft@outlook.com")

success = http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/mailFolders",sbResponse)
If ((success <> True) And (http.LastStatus = 0)) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Dim json As Chilkat.JsonObject
Set json = Chilkat.NewJsonObject
success = json.LoadSb(sbResponse)
json.EmitCompact = False

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

' This is our queue/stack of unprocessed folder ID's
' The recursive nature of this example is that we get the 
' child folders for each folder ID in the idQueue, which may
' cause additional ID's to be added.  We continue  until the idQueue
' is empty.
Dim idQueue As Chilkat.StringArray
Set idQueue = Chilkat.NewStringArray

Dim sbFolderPath As Chilkat.StringBuilder
Set sbFolderPath = Chilkat.NewStringBuilder
Dim sbQueueEntry As Chilkat.StringBuilder
Set sbQueueEntry = Chilkat.NewStringBuilder

' Prime the map and idQueue with the top-level folders.

i = 0

numFolders = json.SizeOfArray("value")
Do While i < numFolders
    json.I = i
    folderName = json.StringOf("value[i].displayName")
    folderId = json.StringOf("value[i].id")
    success = sbFolderPath.SetString("/")
    success = sbFolderPath.Append(folderName)
    folderPath = sbFolderPath.GetAsString()
    success = folderMap.AddStr(folderPath,folderId)
    Debug.Print folderPath; " --> "; folderId

    ' Push the folder path + id onto the idQueue.
    sbQueueEntry.Clear 
    success = sbQueueEntry.SetNth(0,folderPath,"|",False,False)
    success = sbQueueEntry.SetNth(1,folderId,"|",False,False)
    success = idQueue.Append(sbQueueEntry.GetAsString())
    i = i + 1
Loop

' Initial output:
' /Archive --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAG8XunwAAAA=
' /Deleted Items --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEKAAAA
' /Drafts --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEPAAAA
' /Inbox --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA
' /Junk Email --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEiAAAA
' /Outbox --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgELAAAA
' /Sent Items --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEJAAAA
' 

' Process the idQueue until it becomes empty.  This is the recursive loop.

Do While idQueue.Length > 0
    success = sbQueueEntry.SetString(idQueue.GetString(0))
    success = idQueue.RemoveAt(0)

    parentFolderPath = sbQueueEntry.GetNth(0,"|",False,False)
    parentFolderId = sbQueueEntry.GetNth(1,"|",False,False)

    success = http.SetUrlVar("id",parentFolderId)
    success = http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/mailFolders/{$id}/childFolders",sbResponse)
    If ((success <> True) And (http.LastStatus = 0)) Then
        Debug.Print http.LastErrorText
        Exit Sub
    End If

    success = json.LoadSb(sbResponse)
    If (http.LastStatus <> 200) Then
        Debug.Print "Status code = "; http.LastStatus
        Debug.Print json.Emit()
        Debug.Print "Failed."
    End If

    i = 0
    numFolders = json.SizeOfArray("value")
    Do While i < numFolders
        json.I = i
        folderName = json.StringOf("value[i].displayName")
        folderId = json.StringOf("value[i].id")
        success = sbFolderPath.SetString(parentFolderPath)
        success = sbFolderPath.Append("/")
        success = sbFolderPath.Append(folderName)
        folderPath = sbFolderPath.GetAsString()
        success = folderMap.AddStr(folderPath,folderId)
        Debug.Print folderPath; " --> "; folderId

        ' Push the folder path + id onto the idQueue.
        sbQueueEntry.Clear 
        success = sbQueueEntry.SetNth(0,folderPath,"|",False,False)
        success = sbQueueEntry.SetNth(1,folderId,"|",False,False)
        success = idQueue.Append(sbQueueEntry.GetAsString())
        i = i + 1
    Loop

Loop

' The hash table of mail folder paths --> ID's can be persisted to XML and saved to a file or database (or anywhere..)
Dim sbFolderMapXml As Chilkat.StringBuilder
Set sbFolderMapXml = Chilkat.NewStringBuilder
success = folderMap.ToXmlSb(sbFolderMapXml)
success = sbFolderMapXml.WriteFile("qa_data/outlook/folderMap.xml","utf-8",False)

' The hash table can be restored from the serialized XML like this:
Dim ht2 As Chilkat.Hashtable
Set ht2 = Chilkat.NewHashtable
Dim sb2 As Chilkat.StringBuilder
Set sb2 = Chilkat.NewStringBuilder
success = sb2.LoadFile("qa_data/outlook/folderMap.xml","utf-8")
success = ht2.AddFromXmlSb(sb2)

' What's the ID for the folder "/Inbox/abc/subFolderA" ?
Debug.Print "id for /Inbox/abc/subFolderA = "; ht2.LookupStr("/Inbox/abc/subFolderA")

' Final output:

' /Archive --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAG8XunwAAAA=
' /Deleted Items --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEKAAAA
' /Drafts --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEPAAAA
' /Inbox --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA
' /Junk Email --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEiAAAA
' /Outbox --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgELAAAA
' /Sent Items --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEJAAAA
' /Inbox/abc --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAAA=
' /Inbox/xyz --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huwEAAAA=
' /Inbox/abc/subFolderA --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huwAAAQ==
' /Inbox/abc/subFolderB --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huwMAAAA=
' /Inbox/abc/subFolderA/a --> AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huwIAAAA=
' 

' ------------------------------------------------------------------------------------------------------
' This example applies to: Exchange Online | Office 365 | Hotmail.com | Live.com | MSN.com | Outlook.com | Passport.com
' 
' The Microsoft Graph Outlook Mail API lets you read, create, and send messages and attachments, 
' view and respond to event messages, and manage folders that are secured by Azure Active Directory 
' in Office 365. It also provides the same functionality in Microsoft accounts specifically 
' in these domains: Hotmail.com, Live.com, MSN.com, Outlook.com, and Passport.com.