private byte[] ConvertToPdf(string url, string html, string tempFilePath, NameValueCollection headers = null, IEnumerable <GeckoCookie> cookies = null)
{
// Initialize gecko engine
if (!HeadlessGecko.IsInitialized)
{
var initSignal = new SemaphoreSlim(0, 1);
HeadlessGecko.OnInitialized += () =>
{
initSignal.Release();
};
HeadlessGecko.Initialize(GeckoBinDirectory);
initSignal.Wait();
}
var printReadySignal = new SemaphoreSlim(0, 1);
var browser = HeadlessGecko.CreateBrowser();
browser.DocumentCompleted += (s, e) =>
{
// After loading document, waits some time, and send print ready signal
Task.Run(() =>
{
Thread.Sleep(1000); // Some delay need, otherwise throws COMException
printReadySignal.Release();
});
};
// Invoke navigate method in STA browser thread
browser.Invoke((MethodInvoker) delegate
{
Uri uri = null;
var isUriSuccess = Uri.TryCreate(url, UriKind.Absolute, out uri);
if (isUriSuccess && cookies != null)
{
foreach (var cookie in cookies)
{
CookieManager.Add(uri.Host, cookie.Path, cookie.Name, cookie.Value, cookie.Secure, cookie.HttpOnly, false, cookie.ExpiresUnix);
}
}
var geckoHeaders = MimeInputStream.Create();
if (headers != null)
{
var headersItems = headers.AllKeys.SelectMany(headers.GetValues, (k, v) => new { Key = k, Value = v });
foreach (var header in headersItems)
{
geckoHeaders.AddHeader(header.Key, header.Value);
}
return;
}
else
{
geckoHeaders.AddHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0");
geckoHeaders.AddHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
geckoHeaders.AddHeader("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3");
geckoHeaders.AddHeader("Accept-Encoding", "gzip, deflate, br");
geckoHeaders.AddHeader("X-Compress", "1");
geckoHeaders.AddHeader("Connection", "keep-alive");
}
if (string.IsNullOrEmpty(html))
{
browser.Navigate(url, GeckoLoadFlags.None, url, null, geckoHeaders);
}
else
{
browser.LoadHtml(html, url);
}
});
printReadySignal.Wait(); // Waiting before print will completed
//browser.NavigateFinishedNotifier.BlockUntilNavigationFinished();
// Create temporary file and print page to him
if (string.IsNullOrEmpty(tempFilePath))
{
tempFilePath = Path.GetTempFileName();
}
var fi = new FileInfo(tempFilePath);
if (!fi.Exists)
{
if (!fi.Directory.Exists)
{
fi.Directory.Create();
}
File.Create(tempFilePath).Close();
}
browser.Invoke((MethodInvoker) delegate
{
browser.PrintToFile(_config, tempFilePath);
});
var attempts = 0;
while (Tools.IsFileLocked(tempFilePath) || attempts >= _config.MaxLockingCheckAttempts)
{
attempts++;
Thread.Sleep(_config.PdfLockingCheckDelay);
}
if (attempts >= _config.MaxLockingCheckAttempts)
{
throw new IOException("Generated pdf file locked too long");
}
// Read temporary file to MemoryStream and delete
var bytes = File.ReadAllBytes(tempFilePath);
File.Delete(tempFilePath);
browser.Invoke((MethodInvoker) delegate
{
browser.Dispose();
});
return(bytes);
}
/// <summary>
/// Unloads gecko engine. Need to be invoked always, when application shutdown
/// </summary>
public static void UnloadGecko()
{
HeadlessGecko.Unload();
}