(VB.NET UWP/WinRT) List all Pages of Files in Google Drive

Demonstrates how iterate over pages to list files in Google Drive.

See Google Drive Files list for more optional HTTP parameters.

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

Dim success As Boolean = True

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

' This example uses a previously obtained access token having permission for the 
' Google Drive scope.

Dim gAuth As New Chilkat.AuthGoogle
gAuth.AccessToken = "GOOGLE-DRIVE-ACCESS-TOKEN"

Dim rest As New Chilkat.Rest

' Connect using TLS.
Dim bAutoReconnect As Boolean = True
success = Await rest.ConnectAsync("www.googleapis.com",443,True,bAutoReconnect)

' Provide the authentication credentials (i.e. the access token)
rest.SetAuthGoogle(gAuth)

' Get 5 results per page for testing.  (The default page size is 100, with a max of 1000.
rest.AddQueryParam("pageSize","5")

Dim json As New Chilkat.JsonObject
Dim i As Integer
Dim numFiles As Integer

' Send the request for the 1st page.
Dim jsonResponse As String = Await rest.FullRequestNoBodyAsync("GET","/drive/v3/files")

Dim pageNumber As Integer = 1
Dim pageToken As String
Dim bContinueLoop As Boolean = rest.LastMethodSuccess And (rest.ResponseStatusCode = 200)

While bContinueLoop = True

    Debug.WriteLine("---- Page " & pageNumber & " ----")

    ' Iterate over each file in the response and show the name, id, and mimeType.
    json.Load(jsonResponse)

    ' See the sample JSON response at the bottom of this example.
    numFiles = json.SizeOfArray("files")
    i = 0
    While i < numFiles
        json.I = i
        Debug.WriteLine("name: " & json.StringOf("files[i].name"))
        Debug.WriteLine("id: " & json.StringOf("files[i].id"))
        Debug.WriteLine("mimeType: " & json.StringOf("files[i].mimeType"))
        Debug.WriteLine("-")
        i = i + 1
    End While

    ' Get the next page of files.
    ' If the "nextPageToken" is present in the JSON response, then use it in the "pageToken" parameter
    ' for the next request.   If no "nextPageToken" was present, then this was the last page of files.
    pageToken = json.StringOf("nextPageToken")
    bContinueLoop = False
    Dim bHasMorePages As Boolean = json.LastMethodSuccess
    If (bHasMorePages = True) Then
        rest.ClearAllQueryParams()
        rest.AddQueryParam("pageSize","5")
        rest.AddQueryParam("pageToken",pageToken)
        jsonResponse = Await rest.FullRequestNoBodyAsync("GET","/drive/v3/files")
        bContinueLoop = rest.LastMethodSuccess And (rest.ResponseStatusCode = 200)
        pageNumber = pageNumber + 1
    End If


End While

If (rest.LastMethodSuccess <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' A successful response will have a status code equal to 200.
If (rest.ResponseStatusCode <> 200) Then
    Debug.WriteLine("response status code = " & rest.ResponseStatusCode)
    Debug.WriteLine("response status text = " & rest.ResponseStatusText)
    Debug.WriteLine("response header: " & rest.ResponseHeader)
    Debug.WriteLine("response JSON: " & jsonResponse)
    Exit Sub
End If


' A successful JSON response looks like this:
' {
'  "kind": "drive#fileList",
'  "files": [
'    {
'      "kind": "drive#file",
'      "id": "0B53Q6OSTWYolenpjTEU4ekJlQUU",
'      "name": "test",
'      "mimeType": "application/vnd.google-apps.folder"
'    },
'    {
'      "kind": "drive#file",
'      "id": "0B53Q6OSTWYolRm4ycjZtdXhRaEE",
'      "name": "starfish4.jpg",
'      "mimeType": "image/jpeg"
'    },
'    {
'      "kind": "drive#file",
'      "id": "0B53Q6OSTWYolMWt2VzN0Qlo1UjA",
'      "name": "hamlet2.xml",
'      "mimeType": "text/xml"
'    },
' ...
'    {
'      "kind": "drive#file",
'      "id": "0B53Q6OSTWYolc3RhcnRlcl9maWxlX2Rhc2hlclYw",
'      "name": "Getting started",
'      "mimeType": "application/pdf"
'    }
'  ]
' }