(Objective-C) 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.

For more information, see https://docs.microsoft.com/en-us/graph/api/page-get?view=graph-rest-1.0

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#import <CkoHttp.h>
#import <CkoStringBuilder.h>
#import <CkoXml.h>
#import <NSString.h>
#import <CkoBinData.h>

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

CkoHttp *http = [[CkoHttp alloc] init];
BOOL success;

// 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" value: @"0-d2298668edd74dccac7f821fa378bf64!41-3A33FCEB9B74CC15!20350"];

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
success = [http QuickGetSb: @"https://graph.microsoft.com/v1.0/me/onenote/pages/{$page_id}/content?includeIDs=true" sbContent: sbResponseBody];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@",@"HTML content:");
NSLog(@"%@",[sbResponseBody GetAsString]);

int respStatusCode = [http.LastStatus intValue];
NSLog(@"%@%d",@"Response Status Code = ",respStatusCode);
if (respStatusCode >= 400) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",http.LastHeader);
    NSLog(@"%@",@"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>

CkoXml *xml = [[CkoXml alloc] init];
[xml LoadSb: sbResponseBody autoTrim: YES];

// 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.)
CkoStringBuilder *sbState = [[CkoStringBuilder alloc] init];
NSString *url = 0;
CkoBinData *bd = [[CkoBinData alloc] init];
while ([xml NextInTraversal2: sbState] != NO) {

    if ([xml TagEquals: @"img"] == YES) {
        NSLog(@"%@%@",@"img id: ",[xml GetAttrValue: @"id"]);
        url = [xml GetAttrValue: @"src"];
        [bd Clear];
        success = [http QuickGetBd: url binData: bd];
        if (success == NO) {
            NSLog(@"%@",http.LastErrorText);
            return;
        }

        NSLog(@"%@%@",@"Downloaded from ",url);
        NSLog(@"%@",@"----");
        // If desired, bd.WriteFile to save the contents of bd to a file..
    }

    if ([xml TagEquals: @"object"] == YES) {
        NSLog(@"%@%@",@"data-attachment: ",[xml GetAttrValue: @"data-attachment"]);
        NSLog(@"%@%@",@"type: ",[xml GetAttrValue: @"type"]);
        url = [xml GetAttrValue: @"data"];
        [bd Clear];
        success = [http QuickGetBd: url binData: bd];
        if (success == NO) {
            NSLog(@"%@",http.LastErrorText);
            return;
        }

        NSLog(@"%@%@",@"Downloaded from ",url);
        NSLog(@"%@",@"----");
        // If desired, bd.WriteFile to save the contents of bd to a file..
    }

}

NSLog(@"%@",@"Success.");