VB.NET Requires Chilkat v11.0.0+

List Files and Folders in a SharePoint Documents Library

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This example shows how to use Chilkat's HttpCurl class to list the files and folders in the root of a SharePoint Documents document library. In Microsoft Graph, a SharePoint document library is represented as a drive. The example demonstrates how HttpCurl automatically resolves the SharePoint site name to a site ID, finds the drive ID for the Documents library, and then retrieves the children of the library's root folder.

VB.NET

Dim success As Boolean = False

'  This example lists the files and folders in the root of the SharePoint
'  Documents document library.
'  
'  In Microsoft Graph terminology, a SharePoint document library is represented
'  as a "drive".  The default document library is commonly named "Documents".
'  This example shows how HttpCurl can automatically resolve the needed values:
'  
'    site_name  ->  site_id
'    site_id    ->  document_library_id
'  
'  After those values are known, the final request lists the children of the
'  root folder in the Documents document library.

success = False

'  --------------------------------------------------------------------------------------------------------
'  Before running this example, create an Azure App Registration and grant it
'  the Microsoft Graph permissions required to access SharePoint.
'  
'  The application will authenticate using OAuth2 Client Credentials.
'  See:
'  How to Create SharePoint App Registration for OAuth 2.0 Client Credentials
'  --------------------------------------------------------------------------------------------------------

'  Build a JSON authentication configuration.
'  HttpCurl will use this information to automatically obtain OAuth2 access tokens.
Dim jsonAuth As New Chilkat.JsonObject

'  Enable secret lookup.
'  
'  Instead of hard-coding sensitive values such as the client ID,
'  client secret, and token endpoint, secret specification strings
'  are used.  Chilkat automatically retrieves the actual values from
'  Windows Credential Manager (Windows) or Apple Keychain (macOS).
'  
'  See:
'  Secret Specification Strings
jsonAuth.EnableSecrets = True

success = jsonAuth.UpdateString("oauth2.client_id","!!sharepoint|oauth2|client_id")
If (success = True) Then
    success = jsonAuth.UpdateString("oauth2.client_secret","!!sharepoint|oauth2|client_secret")
End If

If (success = True) Then
    success = jsonAuth.UpdateString("oauth2.token_endpoint","!!sharepoint|oauth2|token_endpoint")
End If

If (success = False) Then
    Debug.WriteLine(jsonAuth.LastErrorText)
    Exit Sub
End If


'  Request Microsoft Graph permissions that were granted to the application.
jsonAuth.UpdateString("oauth2.scope","https://graph.microsoft.com/.default")

'  ---------------------------------------------------------------------------------------------------

Dim curl As New Chilkat.HttpCurl

'  Associate the OAuth2 configuration with HttpCurl.
'  
'  When the request is executed, Chilkat automatically obtains an access token
'  if needed and adds the Authorization: Bearer header to the HTTP request.
curl.SetAuth(jsonAuth)

'  Define variables whose values are already known.
'  
'  These variables are referenced in curl commands using
'  {{variable_name}} substitution syntax.
curl.SetVar("sharepoint_hostname","example.sharepoint.com")
curl.SetVar("site_name","test")

'  The final request needs a Microsoft Graph site ID.
'  
'  Because the application only knows the SharePoint site name,
'  define a helper function that can retrieve the site record.
'  HttpCurl can execute this function automatically when it needs
'  to resolve the site_id variable.
curl.AddFunction("getSite","GET https://graph.microsoft.com/v1.0/sites/root:/sites/{{site_name}}")

'  Extract the "id" field from the getSite response and store it
'  in the HttpCurl variable named "site_id".
curl.AddOutput("getSite","id","site_id")

'  The next value needed is the drive ID for the Documents document library.
'  
'  This function lists the drives, also known as document libraries,
'  belonging to the SharePoint site.
curl.AddFunction("getDrives","GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives")

'  Extract the ID of the drive whose name is "Documents".
'  
'  AddOutput2 searches an array in the JSON response.  In this case:
'  
'    response array: value
'    match field:    name
'    match value:    Documents
'    case-sensitive: true
'    output field:   id
'    variable name:  document_library_id
'  
'  The result is that document_library_id will contain the drive ID
'  for the Documents document library.
curl.AddOutput2("getDrives","value","name","Documents",True,"id","document_library_id")

'  The target Microsoft Graph request:
'  
'  GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives/{{document_library_id}}/root/children
'  
'  This lists the files and folders in the root folder of the Documents
'  document library.
'  
'  The {{site_id}} and {{document_library_id}} variables are not set directly
'  by this program.  HttpCurl resolves them automatically by running the
'  helper functions defined above.
Dim curlCommand As String = "GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives/{{document_library_id}}/root/children"

'  Execute the request.
'  
'  HttpCurl examines the target request and determines that it requires
'  both site_id and document_library_id.
'  
'  The execution plan becomes:
'  
'    1) Execute getSite to obtain site_id.
'    2) Execute getDrives to obtain document_library_id.
'    3) Substitute both variables into the target request.
'    4) Execute the root/children request.
'  
'  The final HTTP response returned by DoYourThing is always the response
'  from the target request, which is the last step in the plan.
success = curl.DoYourThing(curlCommand)
If (success = False) Then
    Debug.WriteLine(curl.LastErrorText)
    Exit Sub
End If


'  A successful Graph response should return HTTP 200.
'  Any other status code typically indicates an authentication,
'  permission, site lookup, or document library lookup error.
Dim statusCode As Integer = curl.StatusCode
If (statusCode <> 200) Then
    Debug.WriteLine(curl.ResponseBodyStr)
    Debug.WriteLine("status code = " & statusCode)
    Exit Sub
End If


'  The response body contains a JSON array named "value".
'  Each element represents one file or folder in the root of the
'  Documents document library.
Dim json As New Chilkat.JsonObject
json.EmitCompact = False
curl.GetResponseJson(json)
Debug.WriteLine(json.Emit())
Debug.WriteLine("")

'  Count the number of items returned in the "value" array.
'  
'  This includes both files and folders.
Dim numFiles As Integer = json.SizeOfArray("value")
Debug.WriteLine("Number of files: " & numFiles)
Debug.WriteLine("")

'  Iterate over the files and folders returned by Microsoft Graph
'  and display selected properties for each item.
Dim i As Integer = 0
While i < numFiles
    json.I = i

    Debug.WriteLine("name: " & json.StringOf("value[i].name"))
    Debug.WriteLine("webUrl: " & json.StringOf("value[i].webUrl"))
    Debug.WriteLine("size: " & json.StringOf("value[i].size"))
    Debug.WriteLine("id: " & json.StringOf("value[i].id"))
    Debug.WriteLine("-")
    i = i + 1
End While