Vb .Net File Download With Progress
SCP is a legacy file transfer protocol, or rather a command-line program, a secure analog of rcp that runs over a secure SSH channel.SCP has a very limited feature set and only supports file transfer.In most cases, using SFTP is a better choice. However, SCP is still useful with legacy SSH servers that don't support SFTP yet.
Vb .Net File Download With Progress
To start, download the Progress Control Panel from the following page and run the downloaded .exe file. You will soon be presented with the login screen where you need to provide your Telerik account credentials to sign in.
Many people have wondered how to download a file from the Internet while having a progress bar to track the download progress. In this example, I will demonstrate how to achieve this task. The article also covers how to get file complete percentage, bytes received, bytes left, and download speed (kb/sec).
To make our progress bar effective, we use the CProgressCtrl::SetRange32(); function. The parameters passed to the function are lower value and upper value; lower value is of course 0 and the upper value is the file size, which we determine by simply calling:
The updating of the progress bar is being made every time we read a chunk of the file. Our program uses chunks of 512 bytes, not to overload the connection. The progress is updated every time the program performs another file->Read(); function.
In this part, since we are adding new functionality, we will first adjust the current implementation. The adjustments will cover the addition of a service that contains all the desired logic for handling files in general. That way, we are improving readability and opening opportunities for extending the service in the future with more file handling operations.
Currently, we have an upload button in our form for creating a user. When we create a user, the uploaded picture becomes the profile picture. For the sake of simplicity, we will reuse the current implementation and extend it to implement file download. That said, the pictures that we upload during user creation will be the files that we are going to download after.
Given that we are focusing on a file download, the next step is to extend the controller with a new endpoint for download operation. At the moment, the method will only return a successful result with a corresponding message:
For the time being, we will leave the download operation to return only a successful result and, in the meantime, start with the implementation of the client-side. That way, we can have a clearer view of what are the potential needs of a user and how to modify the API to fulfill those needs.
While looking at the file.service.ts, we can notice that the first part of the URL for both upload and download methods is the same since the FileService is targeting the FileController on the server-side. That said, we can extract it in a separate variable and access it through interpolation:
After the successful refactoring of the FileService, we will create a component that consumes the service and downloads our file. We will name it, respectfully, DownloadComponent, to match the one for upload that we already have. Angular CLI steps in once more with its command for a component generation:
By clicking the download button, we expect that the picture associated with that specific button gets downloaded. To differentiate which file will be downloaded, we need to send some data to the server. The idea is simple: pass the file URL from the form to the file.service.ts and then receive it in the FileController.cs. Passing the URL, we know exactly which file will be downloaded since the URL contains the extension as well. The mentioned implementation requires changes in both the client and server parts.
The reason why we are manipulating the DOM in this manner is that we want to save the user from doing any more work by downloading the file automatically. To achieve that, first, we create an anchor element. Then we hook the downloaded BLOB and the URL of the file to its properties.
File download is a very common requirement nowadays since we are manipulating hundreds of data every day. As an extension to the first article about the file upload, this way we can conclude this topic and be sure we can successfully cover any obstacle that comes our way regarding file manipulation in the browser. The process includes a few simple steps which we learned in this article:
There are several types of files you can download from the web : documents, pictures, videos, extensions etc. Whatever your reason is (an update feature in your application, get extra resources etc.), know how to download a file with C# is a must nowadays.
Telerik ASP.NET Progress Bar is a lightweight customizable control that allows you to visualize the progress of an operationsuch as a download, file transfer, level of completion of a form or any other measurable process.
When downloading very large files from an online source, it can sometimes appear that the program has frozen or crashed when in fact it is still busy downloading and/or writing to disk.This post that shows you how to report the percentage of large file sizes in addition to the overall progress of all downloads and is demonstrated using a WPF application using the MVVM (Model View ViewModel) pattern.
On building and running the program, see how both the percentage progress of the overall download (all files) is communicated in addition to the progress of individual files. Possibly useful in scenarios where very large file downloads are anticipated.
I will be downloading a test file from Internode at the following URL: http://mirror.internode.on.net/pub/test/10meg.test. The scripts will be executed 10 times each with the average displayed as the result.
With the cmdlet already available it is super easy to get started and use. Integration with Write-Progress is handy while watching paint dry scripts run (assuming you know the total file size). Cookies can also be persisted between mutiple requests through the use of the -Session and -WebSession parameters.
There is no visible progress indicator (or any way to query the progress mid transfer). It essentially blocks the thread until the download completes or fails. This isn't a major con, however sometimes it is handy to know how far through the transfer you are.
System.Net.WebClient is my preferred option when file downloads are required. Anything that increases the performance of my scripts is a winner in my books. This method is also fully compatible on Server Core machines and 100% compatible with your Azure Automation runbooks.
This method proved to be the fastest in my test cases! Extensive integration with Write-Progress gives you a clear indicator of the file size and progress. The -Asynchronous flag can be used to queue transfers asychronously. This method is also incredibly flexible supporting separate credentials for the destination server AND web proxy, if required.
This method is perfect for scenarios where you want to limit the bandwidth used in a file download or where time isn't a major issue. I have used this to sync files nightly at full speed and during the day at half speed using Transfer Policies. BITS is also easy to monitor and audit.
DoFileDownload: Download Files Using IE's Download Dialog DoFileDownload: Customize the IE Download Dialog FtpFindFirstFile: Connect and Retrieve FTP File Listings FtpFindFirstFile: Download Files via FTP with a Download Progress Callback Prerequisites IE3 or later installed. The URLDownloadToFile API is available on all versions of the Windows operating system (except Win3, WinNT3.x). By passing the remote file name and the local file path and name, the API downloads the bits of the specified file saving them as the target name. The function works with all file types - plain text, images, html, mpg, wav and zip files etc. without modification to the routine or concern for the file being downloaded, nor is there any apparent size restriction or limitation. The downloaded file can then be either opened and displayed in VB (as the illustration shows for a html file), or the path and filename can be passed to ShellExecute or ShellExecuteEx for opening in the associated application. For multiple files It downloads them one at a time, and the wrapper returns true if the download of each file was successful.
UrlDownloadToFile hauls the file down to the IE cache, then copies the file to the local or remote file system destination you specify. Because it uses the cache, subsequent calls to this API will pull the cached copy, not the copy off the site. Where assurance is needed that the call s always pulling from the site, you need to delete the cached copy of the file first. Thankfully Windows provides a one-liner for that too, and it - along with UrlDownloadToFile - is demonstrated in the code at URLDownloadToFile: Fast, Simple and Transparent File Downloads Bypassing the IE Cache.
Once again, the illustration above simply shows a HTML file downloaded with this code and displayed in a text box as proof of success. This API can download anything, so is not limited to simply downloading HTML plain-text files.
See what you can do with User File System in a 1-minute Microsoft Office document editing video. The video shows the Virtual File System sample supplied with User File System that supports on-demand content loading, on-demand folders listing, file status indication, custom icons in the Status column, download progress bar, and automatic document locking.
This sample implements a virtual file system with synchronization support, on-demand loading, selective offline files support, upload and download progress, and error reporting. It synchronizes files and folders both from remote storage to the user file system and from the user file system to remote storage.
To simulate the remote storage, this sample is using a folder in the local file system on the same machine. This sample supports all basic synchronization features provided by the Virtual File System sample: folders on-demand listing, files on-demand content loading, selective offline files support, hydration progress. The sample is written in C#/.NET. 350c69d7ab