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C#

OneNote - Get Page HTML Content

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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.

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C# 
bool success = false;

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

Chilkat.Http http = new Chilkat.Http();

// 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.
http.AuthToken = "ACCESS_TOKEN";

http.SetUrlVar("page_id","0-d2298668edd74dccac7f821fa378bf64!41-3A33FCEB9B74CC15!20350");

Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
success = http.QuickGetSb("https://graph.microsoft.com/v1.0/me/onenote/pages/{$page_id}/content?includeIDs=true",sbResponseBody);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("HTML content:");
Debug.WriteLine(sbResponseBody.GetAsString());

int respStatusCode = http.LastStatus;
Debug.WriteLine("Response Status Code = " + Convert.ToString(respStatusCode));
if (respStatusCode >= 400) {
    Debug.WriteLine("Response Header:");
    Debug.WriteLine(http.LastHeader);
    Debug.WriteLine("Failed.");
    return;
}

// 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>

Chilkat.Xml xml = new Chilkat.Xml();
xml.LoadSb(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.)
Chilkat.StringBuilder sbState = new Chilkat.StringBuilder();
string url;
Chilkat.BinData bd = new Chilkat.BinData();
while (xml.NextInTraversal2(sbState) != false) {

    if (xml.TagEquals("img") == true) {
        Debug.WriteLine("img id: " + xml.GetAttrValue("id"));
        url = xml.GetAttrValue("src");
        bd.Clear();
        success = http.QuickGetBd(url,bd);
        if (success == false) {
            Debug.WriteLine(http.LastErrorText);
            return;
        }

        Debug.WriteLine("Downloaded from " + url);
        Debug.WriteLine("----");
        // If desired, bd.WriteFile to save the contents of bd to a file..
    }

    if (xml.TagEquals("object") == true) {
        Debug.WriteLine("data-attachment: " + xml.GetAttrValue("data-attachment"));
        Debug.WriteLine("type: " + xml.GetAttrValue("type"));
        url = xml.GetAttrValue("data");
        bd.Clear();
        success = http.QuickGetBd(url,bd);
        if (success == false) {
            Debug.WriteLine(http.LastErrorText);
            return;
        }

        Debug.WriteLine("Downloaded from " + url);
        Debug.WriteLine("----");
        // If desired, bd.WriteFile to save the contents of bd to a file..
    }

}

Debug.WriteLine("Success.");