Downloading more than one file from web server

[steve_rm]

Hello,

I am using the web client to download a file. Which works ok.

However, now I have to download many and the number of files to download will change everyday.

I am not sure how I can get the web client to know which files have been downloaded or not? I was thinking of using a for loop to download each file. But I will never know how many there are to download?

The web client could download the same file twice?

Many thanks for any suggestions,

Private Sub btnStartDownload_Click(ByVal sender As Object, ByVal e As EventArgs)
 Dim client As New WebClient()
 AddHandler client.DownloadProgressChanged, AddressOf client_DownloadProgressChanged
 AddHandler client.DownloadFileCompleted, AddressOf client_DownloadFileCompleted
 
 ' Starts the download
 client.DownloadFileAsync(New Uri("UrlFilePath"), "DownloadPath")
 
 btnStartDownload.Text = "Download In Process"
 btnStartDownload.Enabled = False
End Sub

[stanav]

Unless you somehow get a list of the files available for download from the webserver and you maintain a list of downloaded files yourself which you can then compare the 2 lists to figure out which file has not been downloaded, I don't think you can tell the webclient to download only files that has not been downloaded.

[steve_rm]

Hello,

Thanks for your response.

I can maintain a list of files myself that I can download and compare. But I think I would have to download it first then compare. And it could keep trying to download the same file. I think I might end up going round in circles.

Is there a way to get the number of files that are on the web server?

Many thanks,

[stanav]

Is there a way to get the number of files that are on the web server?

Short answer: No.
Unless: you own that website and you have to modify the website to provide you with smoe mechanism to get the list of files available (a webservice or simply another webpage that list out the files)

[jakkjakk]

I like to use flashfxp.. It's easy. Visual Studio is good for writing code. Leave it that way.

[steve_rm]

The flashfxp is not a solution for this issue.

Thanks anyway

[jmcilhinney]

You have to retrieve something from the server to compare to something local. Depending on circumstances that could be the file timestamp, a hash of the contents or the actual contents.