(Delphi ActiveX) 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.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
jsonAuth: TChilkatJsonObject;
curl: TChilkatHttpCurl;
curlCommand: WideString;
statusCode: Integer;
json: TChilkatJsonObject;
numFiles: Integer;
i: Integer;

begin
success := 0;

// 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 := 0;

// --------------------------------------------------------------------------------------------------------
// 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.
jsonAuth := TChilkatJsonObject.Create(Self);

// 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 := 1;

success := jsonAuth.UpdateString('oauth2.client_id','!!sharepoint|oauth2|client_id');
if (success = 1) then
  begin
    success := jsonAuth.UpdateString('oauth2.client_secret','!!sharepoint|oauth2|client_secret');
  end;
if (success = 1) then
  begin
    success := jsonAuth.UpdateString('oauth2.token_endpoint','!!sharepoint|oauth2|token_endpoint');
  end;
if (success = 0) then
  begin
    Memo1.Lines.Add(jsonAuth.LastErrorText);
    Exit;
  end;

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

// ---------------------------------------------------------------------------------------------------

curl := TChilkatHttpCurl.Create(Self);

// 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.ControlInterface);

// 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',1,'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.
curlCommand := '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 = 0) then
  begin
    Memo1.Lines.Add(curl.LastErrorText);
    Exit;
  end;

// A successful Graph response should return HTTP 200.
// Any other status code typically indicates an authentication,
// permission, site lookup, or document library lookup error.
statusCode := curl.StatusCode;
if (statusCode <> 200) then
  begin
    Memo1.Lines.Add(curl.ResponseBodyStr);
    Memo1.Lines.Add('status code = ' + IntToStr(statusCode));
    Exit;
  end;

// The response body contains a JSON array named "value".
// Each element represents one file or folder in the root of the
// Documents document library.
json := TChilkatJsonObject.Create(Self);
json.EmitCompact := 0;
curl.GetResponseJson(json.ControlInterface);
Memo1.Lines.Add(json.Emit());
Memo1.Lines.Add('');

// Count the number of items returned in the "value" array.
// 
// This includes both files and folders.
numFiles := json.SizeOfArray('value');
Memo1.Lines.Add('Number of files: ' + IntToStr(numFiles));
Memo1.Lines.Add('');

// Iterate over the files and folders returned by Microsoft Graph
// and display selected properties for each item.
i := 0;
while i < numFiles do
  begin
    json.I := i;

    Memo1.Lines.Add('name: ' + json.StringOf('value[i].name'));
    Memo1.Lines.Add('webUrl: ' + json.StringOf('value[i].webUrl'));
    Memo1.Lines.Add('size: ' + json.StringOf('value[i].size'));
    Memo1.Lines.Add('id: ' + json.StringOf('value[i].id'));
    Memo1.Lines.Add('-');
    i := i + 1;
  end;
end;