How to download a file with Puppeteer Sharp?

Question

Here is the code that works but it doesn't wait until the completion. How do I make sure the file has been saved?

    var browser = await Puppeteer.LaunchAsync(new LaunchOptions
    {
        ExecutablePath = "C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe",
        Headless = false,
    });
    var page = (await browser.PagesAsync()).First();
    page.Response += async (object sender, ResponseCreatedEventArgs e) =>
    {
        if (e.Response.Url.Contains(".mp4"))
        {
            byte[] buff = await e.Response.BufferAsync();
            File.WriteAllBytes($"{DateTime.UtcNow.ToFileTime()}.mp4", buff);
        }
    };
    await page.GoToAsync("https://file-examples-com.github.io/uploads/2017/04/file_example_MP4_480_1_5MG.mp4");
    await Task.Delay(30000);

I bet the server is sending a partial content (https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/206) — hardkoded, Dec 08 '20 at 13:55
atm I am delaying until there is no more access to the file. But I want a better solution. I am using HTTPS proxy which is not supported by C# HttpClient — Toolkit, Dec 09 '20 at 14:31

score 0 · Answer 1 · answered Feb 20 '23 at 06:06

Here, just wrote it:

 public static async Task<FileInfo> DownloadFileAsync(string url)
        {
            try
            {
                await _page.GoToAsync(url);
            }
            catch (NavigationException)
            {
                // Trying to open a file page throws navigation exception, should be ignored
            }

            await _page.WaitForNetworkIdleAsync();

            while (Directory.GetFiles(_downloadDirectory, "*.crdownload", SearchOption.AllDirectories).Length > 0)
            {
                await Task.Delay(250);
            }

            for (int i = 0; i < 100; i++)
            {
                var finishedFiles = (new DirectoryInfo(_downloadDirectory)).GetFiles();
                var downloadedFile = finishedFiles.OrderByDescending(f => f.LastWriteTime).FirstOrDefault();
                if (downloadedFile != null)
                {
                    return downloadedFile!;
                }

                await Task.Delay(250);
            }

            throw new Exception($"Download failed for: {url}");
        }

How to download a file with Puppeteer Sharp?

1 Answers1