(VB.NET UWP/WinRT) OneDrive -- List Large Directory

Demonstrates how to get the entire collection of DriveItem children when the collection is large and multiple pages need to be requested. To test this example, I created a DriveItem with 450 children.

Note: This example requires Chilkat v9.5.0.68 or greater.

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).

' (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.)
http.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN"

' This example will get the DriveItems in /lots-of-files, which has 450 children..
http.SetUrlVar("item_path","/lots-of-files")

Dim resp As String
Dim i As Integer
Dim numItems As Integer

Dim json As New Chilkat.JsonObject
json.EmitCompact = False

' This loop will download DriveItems in sets of 50 until no more exist.
Dim bGetMore As Boolean = True
' (Add the $top query parameter to define the page size, i.e. the max number of results to return).
Dim nextLink As String = "https://graph.microsoft.com/v1.0/me/drive/root:{$item_path}:/children?$top=50"

While (bGetMore = True)

    ' Get the next chunk of DriveItems
    resp = Await http.QuickGetStrAsync(nextLink)
    If (http.LastMethodSuccess <> True) Then
        Debug.WriteLine(http.LastErrorText)
        Exit Sub
    End If


    ' The response should be JSON.
    json.Load(resp)

    ' A successful response should return a status code of 200.
    If (http.LastStatus <> 200) Then
        Debug.WriteLine(json.Emit())
        Debug.WriteLine("Response status = " & http.LastStatus)
        Exit Sub
    End If


    ' Iterate over the DriveItems in the JSON response:
    i = 0
    numItems = json.SizeOfArray("value")
    While i < numItems
        json.I = i
        Debug.WriteLine("name: " & json.StringOf("value[i].name"))
        i = i + 1
    End While

    ' If a nextLink was included in the JSON, use it to get the next set of 50 DriveItems.
    ' Otherwise, exit the loop.
    If (json.HasMember("""@odata.nextLink""") = True) Then
        nextLink = json.StringOf("""@odata.nextLink""")
        Debug.WriteLine("nextLink: " & nextLink)
    Else
        bGetMore = False
    End If

End While