// https://github.com/LanderVe/WPF_PDFDocument/blob/master/WPF_PDFDocument/WPF_PDFDocument.csproj
// https://blogs.u2u.be/lander/post/2018/01/23/Creating-a-PDF-Viewer-in-WPF-using-Windows-10-APIs
// https://docs.microsoft.com/en-us/uwp/api/windows.data.pdf.pdfdocument.getpage?view=winrt-20348
private async Task ImportImages(ProgressDialog progress, CancellationToken token)
{
logger.Start();
logger.StartClock();
progress.SetMaximum(4);
progress.SetMessage($"Importing {address}...");
var pdfFile = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
// WebView2 needs to run in an STA thread
await SingleThreaded.Invoke(() =>
{
// WebView2 needs a message pump so host in its own invisible worker dialog
using (var form = new WebViewWorkerDialog(
new WebViewWorker(async(webview) =>
{
webview.Source = new Uri(address);
progress.Increment();
await Task.Yield();
return(true);
}),
new WebViewWorker(async(webview) =>
{
progress.Increment();
await Task.Delay(2000);
await webview.CoreWebView2.PrintToPdfAsync(pdfFile);
progress.Increment();
return(true);
})))
{
form.ShowDialog(progress);
}
});
if (token.IsCancellationRequested)
{
return;
}
if (!File.Exists(pdfFile))
{
logger.WriteLine($"PDF file not found, {pdfFile}");
return;
}
// convert PDF pages to images...
logger.WriteLine("rendering images");
try
{
Page page = null;
using (var one = new OneNote())
{
page = target == ImportWebTarget.Append
? one.GetPage()
: await CreatePage(one,
target == ImportWebTarget.ChildPage?one.GetPage() : null, address);
}
var ns = page.Namespace;
var container = page.EnsureContentContainer();
var file = await StorageFile.GetFileFromPathAsync(pdfFile);
var doc = await Windows.Data.Pdf.PdfDocument.LoadFromFileAsync(file);
await file.DeleteAsync();
progress.SetMaximum((int)doc.PageCount);
for (int i = 0; i < doc.PageCount; i++)
{
progress.SetMessage($"Rasterizing image {i} of {doc.PageCount}");
progress.Increment();
//logger.WriteLine($"rasterizing page {i}");
var pdfpage = doc.GetPage((uint)i);
using (var stream = new InMemoryRandomAccessStream())
{
await pdfpage.RenderToStreamAsync(stream);
using (var image = new Bitmap(stream.AsStream()))
{
var data = Convert.ToBase64String(
(byte[])new ImageConverter().ConvertTo(image, typeof(byte[]))
);
container.Add(new XElement(ns + "OE",
new XElement(ns + "Image",
new XAttribute("format", "png"),
new XElement(ns + "Size",
new XAttribute("width", $"{image.Width}.0"),
new XAttribute("height", $"{image.Height}.0")),
new XElement(ns + "Data", data)
)),
new Paragraph(ns, " ")
);
}
}
}
progress.SetMessage($"Updating page");
using (var one = new OneNote())
{
await one.Update(page);
}
}
catch (Exception exc)
{
logger.WriteLine(exc.Message, exc);
}
logger.WriteTime("import complete");
logger.End();
}
// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
private async Task <WebPageInfo> DownloadWebContent(Uri uri)
{
// This JavaScript copies the HTML of the entire web page to the clipboard
// and returns the text of the page <title>
const string javascript =
@"var range = document.createRange();
range.selectNodeContents(document.body);
var selection = window.getSelection();
selection.removeAllRanges();
selection.addRange(range);
document.execCommand('copy');
document.getElementsByTagName('title')[0].innerText;";
string content = null;
string title = null;
// WebView2 needs to run in an STA thread
await SingleThreaded.Invoke(() =>
{
// WebView2 needs a message pump so host in its own invisible worker dialog
using (var form = new WebViewWorkerDialog(
startup:
new WebViewWorker(async(webview) =>
{
//logger.WriteLine($"starting up webview with {uri}");
webview.Source = uri;
await Task.Yield();
return(true);
}),
work:
new WebViewWorker(async(webview) =>
{
//logger.WriteLine("getting webview content");
await Task.Delay(200);
title = await webview.ExecuteScriptAsync(javascript);
//logger.WriteLine($"title=[{title}]");
await Task.Delay(100);
if (Win.Clipboard.ContainsText(Win.TextDataFormat.Html))
{
content = Win.Clipboard.GetText(Win.TextDataFormat.Html);
var index = content.IndexOf(
"<html", StringComparison.InvariantCultureIgnoreCase);
if (index > 0)
{
content = content.Substring(index);
}
}
else
{
content = null;
}
//logger.WriteLine($"content=[{content}]");
await Task.Yield();
return(true);
})))
{
form.ShowDialog();
}
});
if (title != null && title.Length > 1 &&
title[0] == '"' && title[title.Length - 1] == '"')
{
title = title.Substring(1, title.Length - 2);
}
var bycount = content == null ? 0 : content.Length;
logger.WriteLine($"retrieved {bycount} bytes from {title} ({uri.AbsoluteUri})");
return(new WebPageInfo
{
Content = content,
Title = title
});
}
