Sometimes in a web site you might need the user to upload a zipped file for space issues but the user can’t or doesn’t know how. You might want to conserve space on the server if you have a lot of images. This is also a good way to keep Google from indexing your images from their search. In another article I will show you how to unzip or uncompress but today here is how you can zip an uploaded file. I found a similar article but it was in c#.
As always you need to create a new web application project in Visual Studio and name the project ‘UploadNZip’. Then add a form and add a web reference to iconic.dll. You can get the file from here.
Add the following code to the page.
<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:FileUpload ID="file2Upload" runat="server" /> <asp:Button ID="btnZipFile" Text="ZipFile" runat="server" OnClick="btnZipFile_Click" /> <asp:Label ID="lblStatus" runat="server" ForeColor="Red" /> </div> </form>
In the code behind of this form add the following code.
Protected Sub btnZipFile_Click(sender As Object, e As EventArgs) Handles btnZipFile.Click 'Zip a File after uploading If file2Upload.HasFile Then 'Store the directory for the Zipped File Dim CurrentPath As String = Server.MapPath("~/ZipFiles/") 'Get the variables to save the file first to the location Dim curpath As String = CurrentPath & Path.GetFileName(file2Upload.PostedFile.FileName) file2Upload.SaveAs(curpath) Dim filenames As String() = Directory.GetFiles(CurrentPath) 'As files to the zipped file. This would be one file for this example but could be more Using zip As New Ionic.Zip.ZipFile() Dim [date] As String = DateTime.Now.ToString("d") [date] = [date].Replace("/", "") zip.AddFiles(filenames, [date]) zip.Save(CurrentPath & [date] & ".zip") lblStatus.Text = "File Added Successfully" End Using If lblStatus.Text = "File Added Successfully" Then 'Removes the non-zipped file from the folder File.Delete(curpath) End If End If End Sub
Note: See the comments in the code for better understanding
That’s it. It is very simple to implement and can save a lot of space depending on the files you are trying to compress. This library can also allow you to add password protection to the files you compress. A great way to store files that need protection. One scenario would be if someone paid for a document you can then allow them to get the file, enter the password and track how many times this is done.
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