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Unzip example

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Sébastien
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Sébastien asked on 19 Dec 2019, 12:51 PM

Hello,

Do you have an example to unzip a zip with multiple files ? 

I wish I could use ExtractToDirectory(string sourceArchiveFileName, string destinationDirectoryName), but it seems to not be available on Xamarin yet. 

Thanks.

 

 

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Lance | Manager Technical Support
Telerik team
answered on 20 Dec 2019, 06:43 PM

Hello S├ębastien,

The Zip Extensions are available for Xamarin, but you need to take special consideration for the file paths. I've written a demo for you, find it attached to this reply.

For your convenience, here's the relevant code:

private async void DownloadAndExtractFilesButton_Clicked(object sender, EventArgs e)
{
    var zipFileName = "MyFiles.zip";
    var localFolder = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
    var zipFilePath = Path.Combine(localFolder,zipFileName);

    // Downloading ZIP file
    using (var client = new HttpClient())
    {
        using (var downloadStream = await client.GetStreamAsync("https://progressdevsupport.blob.core.windows.net/sampledocs/MyFiles.zip"))
        using (var fileStream = File.OpenWrite(zipFilePath))
        {
            await downloadStream.CopyToAsync(fileStream);
        }
    }

    // Create folder to extract files into
    var destinationFolder = Path.Combine(localFolder, "ExtractedFiles");

    // Extract files into new directory
    ZipFile.ExtractToDirectory(zipFilePath, destinationFolder);

    // Verify files in new directory
    OutputLabel.Text = $"Listing files in {destinationFolder}:\r\n\n";

    foreach (var fileName in Directory.EnumerateFiles(destinationFolder))
    {
        OutputLabel.Text += $"{fileName}\r\n";
    }
}

Notice two important items:

  • The ExtractToDirectory works as expected (it is an extension method for System.IO.Compression.ZipFile)
  • The LocalApplicationData folder, is required to properly work with files in Xamarin (visit the Microsoft documentation to learn more: Working With Files - Saving and Loading Files

Bonus

I added a separate method that shows how you can enumerate the ZIP archives files and work with them directly without having to extract to a folder first.

private async void OpenArchive_Clicked(object sender, EventArgs e)
{
    using (var client = new HttpClient())
    {
        using (var downloadStream = await client.GetStreamAsync("https://progressdevsupport.blob.core.windows.net/sampledocs/MyFiles.zip"))
        using (var memStream = new MemoryStream())
        {
            await downloadStream.CopyToAsync(memStream);

            using (var archive = new Telerik.Zip.ZipArchive(memStream))
            {
                // Iterate over the files in the archive
                foreach (var zipArchiveEntry in archive.Entries)
                {
                    // Display the file name
                    OutputLabel.Text += $"{zipArchiveEntry.Name}\r\n";

                    // Open the file
                    using (var archiveEntryStream = zipArchiveEntry.Open())
                    {
                        // Writing the file's contents to the UI
                        using (var reader = new StreamReader(archiveEntryStream))
                        {
                            OutputLabel.Text += $"{reader.ReadToEnd()}\r\n\n";
                        }
                    }
                }
            }
        }
    }
}

In that example, I was able to open and use the file contents without needing to first extract and save to a new directory. See RadZipLibrary Getting Started for more information.

The demo uses the Telerik NuGet server to add the Telerik.UI.for.Xamarin package. If you don't already have it as a package source, visit the Telerik NuGet Server documentation.

Further Assistance

If you have any trouble, please open a Support Ticket here and share the code that you're using. This will allow us to directly investigate and offer possible solutions.

Regards,
Lance | Team Lead - US DevTools Support
Progress Telerik

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Sébastien
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answered on 23 Dec 2019, 09:34 AM
Thank you very much Lance for this detailed example :)
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Lance | Manager Technical Support
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Sébastien
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