Delphi DLL
OneNote - Get Page HTML Content

Download the HTML content of a OneNote page. Also iterates over the images and attachments on the OneNote page and downloads the content for each.
Chilkat Delphi DLL Downloads

Download Chilkat for Delphi DLL
Delphi DLL
uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, StringBuilder, BinData, Xml;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
http: HCkHttp;
sbResponseBody: HCkStringBuilder;
respStatusCode: Integer;
xml: HCkXml;
sbState: HCkStringBuilder;
url: PWideChar;
bd: HCkBinData;

begin
success := False;

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

http := CkHttp_Create();

// Implements the following CURL command:

// curl -X GET https://graph.microsoft.com/v1.0/me/onenote/pages/{id}/content?includeIDs=true \
//   -H 'authorization: Bearer ACCESS_TOKEN'

// Use the following online tool to generate HTTP code from a CURL command
// Convert a cURL Command to HTTP Source Code

// Adds the "Authorization: Bearer ACCESS_TOKEN" header.
CkHttp_putAuthToken(http,'ACCESS_TOKEN');

CkHttp_SetUrlVar(http,'page_id','0-d2298668edd74dccac7f821fa378bf64!41-3A33FCEB9B74CC15!20350');

sbResponseBody := CkStringBuilder_Create();
success := CkHttp_QuickGetSb(http,'https://graph.microsoft.com/v1.0/me/onenote/pages/{$page_id}/content?includeIDs=true',sbResponseBody);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add('HTML content:');
Memo1.Lines.Add(CkStringBuilder__getAsString(sbResponseBody));

respStatusCode := CkHttp_getLastStatus(http);
Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkHttp__lastHeader(http));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// Let's get the images and attached files.
// Here's sample HTML content with 2 images and one PDF attachment:

// <html lang="en-US">
// 	<head>
// 		<title>A page with rendered images and an attached file</title>
// 		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
// 		<meta name="created" content="2020-10-23T12:00:00.0000000" />
// 	</head>
// 	<body data-absolute-enabled="true" style="font-family:Calibri;font-size:11pt">
// 		<div id="div:{b130eb6c-638a-4f97-8f7e-b6d9e2e88bf9}{32}" data-id="_default" style="position:absolute;left:48px;top:120px;width:624px">
// 			<p id="p:{b130eb6c-638a-4f97-8f7e-b6d9e2e88bf9}{39}" style="margin-top:5.5pt;margin-bottom:5.5pt">Here&#39;s an image from an online source:</p>
// 			<img id="img:{ee18fe8d-b219-4baf-9b4d-4fc680579f0d}{1}" alt="an image on the page" width="500" height="500" src="https://graph.microsoft.com/v1.0/users('admin@chilkat.io')/onenote/resources/0-e71b45b763484921b4200e32c2439a47!1-3A33FCEB9B74CC15!20350/$value" data-src-type="image/jpeg" data-fullres-src="https://graph.microsoft.com/v1.0/users('admin@chilkat.io')/onenote/resources/0-e71b45b763484921b4200e32c2439a47!1-3A33FCEB9B74CC15!20350/$value" data-fullres-src-type="image/jpeg" />
// 			<p id="p:{b130eb6c-638a-4f97-8f7e-b6d9e2e88bf9}{43}" style="margin-top:5.5pt;margin-bottom:5.5pt">Here&#39;s an image uploaded as binary data:</p>
// 			<img id="img:{ee18fe8d-b219-4baf-9b4d-4fc680579f0d}{3}" alt="an image on the page" width="300" height="225" src="https://graph.microsoft.com/v1.0/users('admin@chilkat.io')/onenote/resources/0-a60516b962b842f2ae9bec75c16b31de!1-3A33FCEB9B74CC15!20350/$value" data-src-type="image/jpeg" data-fullres-src="https://graph.microsoft.com/v1.0/users('admin@chilkat.io')/onenote/resources/0-a60516b962b842f2ae9bec75c16b31de!1-3A33FCEB9B74CC15!20350/$value" data-fullres-src-type="image/jpeg" />
// 			<p id="p:{b130eb6c-638a-4f97-8f7e-b6d9e2e88bf9}{47}" style="margin-top:5.5pt;margin-bottom:5.5pt">Here&#39;s a file attachment:</p>
// 			<object data-attachment="FileName.pdf" type="application/pdf" data="https://graph.microsoft.com/v1.0/users('admin@chilkat.io')/onenote/resources/0-9e685efb33a24a6a8de1b9c707d28385!1-3A33FCEB9B74CC15!20350/$value" />
// 		</div>
// 	</body>
// </html>

xml := CkXml_Create();
CkXml_LoadSb(xml,sbResponseBody,True);

// Iterate over each element in the XML.  Each time we find an "img" or "object", download the data.
// (The sbState is an object used to keep track of the current state of the traversal.)
sbState := CkStringBuilder_Create();

bd := CkBinData_Create();
while CkXml_NextInTraversal2(xml,sbState) <> False do
  begin

    if (CkXml_TagEquals(xml,'img') = True) then
      begin
        Memo1.Lines.Add('img id: ' + CkXml__getAttrValue(xml,'id'));
        url := CkXml__getAttrValue(xml,'src');
        CkBinData_Clear(bd);
        success := CkHttp_QuickGetBd(http,url,bd);
        if (success = False) then
          begin
            Memo1.Lines.Add(CkHttp__lastErrorText(http));
            Exit;
          end;
        Memo1.Lines.Add('Downloaded from ' + url);
        Memo1.Lines.Add('----');
        // If desired, bd.WriteFile to save the contents of bd to a file..
      end;

    if (CkXml_TagEquals(xml,'object') = True) then
      begin
        Memo1.Lines.Add('data-attachment: ' + CkXml__getAttrValue(xml,'data-attachment'));
        Memo1.Lines.Add('type: ' + CkXml__getAttrValue(xml,'type'));
        url := CkXml__getAttrValue(xml,'data');
        CkBinData_Clear(bd);
        success := CkHttp_QuickGetBd(http,url,bd);
        if (success = False) then
          begin
            Memo1.Lines.Add(CkHttp__lastErrorText(http));
            Exit;
          end;
        Memo1.Lines.Add('Downloaded from ' + url);
        Memo1.Lines.Add('----');
        // If desired, bd.WriteFile to save the contents of bd to a file..
      end;
  end;

Memo1.Lines.Add('Success.');

CkHttp_Dispose(http);
CkStringBuilder_Dispose(sbResponseBody);
CkXml_Dispose(xml);
CkStringBuilder_Dispose(sbState);
CkBinData_Dispose(bd);

end;