Hi there, I am having problems with downloading dynamically created zip files which are bigger than 280mB. I have based my code on your example "ASP.NET Example in VB" example (http://dotnetzip.codeplex.com/wikipage?title=ASPNET%20Example%202&referringTitle=Examples), but I have changed the code to save the file to disk, then enable a user to download it. In my code, downloading a zipped file >280mB fails, while smaller files work. This occurs on my dev machine, as well as on a Rackspace Cloud Server where my app is hosted. If I place a link to a large zip file, it downloads without a hitch. (e.g. 2010-Jul-29-093041-66.zip 166kB )
\r\nI was wondering if there is a limitation on downloading large files, a setting that needs tweaking, or if there is an error in my code/logic. Here is my code. Also, if you require, I can send a link to the server where this page is hosted.
\r\nAny help will be gratefully appreciated.
\r\nThanks in advance,
\r\nRob Nagel
\r\nCode: (I changed the folder "fodder" to "zipfiles")
\r\n<%@ Page
Language="VB"
Debug="true"
%>
<%@ Import Namespace="System.Text" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="Ionic.Zip" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="System.Text" %>
<%@ Import Namespace="System.Security.Permissions" %>
<script language="VB" runat="server">
\r\n' ZipExample.aspx
'
' This .aspx page demonstrates how to use the DotNetZip library from within ASP.NET.
'
' To run it,
' 1. drop the Ionic.Zip.dll into the \\bin directory of yoru asp.net app
' 2. create a subdirectory called "fodder" in your web app directory.
' 3. copy into that directory a variety of random files.
' 4. insure your web.config is properly set up (See below)
'
'
' notes:
' This requies the .NET Framework 3.5 - because it uses the ListView control that is
' new for ASP.NET in the .NET Framework v3.5.
'
' To use this control, you must add the new web controls. Also, you must use the v3.5 compiler.
' Here's an example web.config that works with this aspx file:
'
' <configuration>
' <system.web>
' <trust level="Medium" />
' <compilation defaultLanguage="c#" />
' <pages>
' <controls>
' <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
' </controls>
' </pages>
' </system.web>
' <system.codedom>
' <compilers>
' <compiler language="c#;cs;csharp"
' extension=".cs"
' warningLevel="4"
' type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
' <providerOption name="CompilerVersion" value="v3.5" />
' <providerOption name="WarnAsError" value="false" />
' </compiler>
'
' <compiler language="vb;vbs;visualbasic;vbscript"
' extension=".vb"
' warningLevel="4"
' type="Microsoft.VisualBasic.VBCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
' <providerOption name="CompilerVersion" value="v3.5" />
' <providerOption name="OptionInfer" value="false" />
' <providerOption name="WarnAsError" value="false" />
' </compiler>
'
' </system.codedom>
' </configuration>
'
'
'
Dim width as String = "100%"
Public Sub Page_Load (ByVal sender As Object, ByVal e As System.EventArgs)
\r\nTry
\r\n If Not ( Page.IsPostBack ) Then
' populate the dropdownlist
' must have a directory called "fodder" in the web app
Dim sMappedPath As String = Server.MapPath("zipfiles")
Dim fqFilenames As New List(Of String)(System.IO.Directory.GetFiles(sMappedPath))
Dim filenames As List(Of String) = fqFilenames.ConvertAll(Function(s) s.Replace(sMappedPath & "\\", ""))
\r\n ErrorMessage.InnerHtml = ""
FileListView.DataSource = filenames
FileListView.DataBind()
End If
Catch
\r\n ' Ignored
End Try
End Sub
\r\n\r\n
Public Sub btnGo_Click (ByVal sender As System.Object, ByVal e As System.EventArgs)
\r\n ErrorMessage.InnerHtml ="" ' debugging only
Dim filesToInclude as New System.Collections.Generic.List(Of String)()
Dim sMappedPath As String = Server.MapPath("zipfiles")
Dim source As DataKeyArray= FileListView.DataKeys
For Each item As ListViewDataItem in FileListView.Items
\r\n Dim chkbox As CheckBox= CType(item.FindControl("include"), CheckBox)
Dim lbl As Label = CType(item.FindControl("label"), Label)
If Not (chkbox Is Nothing OR lbl Is Nothing) Then
If (chkbox.Checked) Then
ErrorMessage.InnerHtml = ErrorMessage.InnerHtml & _
String.Format("adding file: {0}<br/>\\n", lbl.Text)
filesToInclude.Add(System.IO.Path.Combine(sMappedPath,lbl.Text))
End If
End If
Next
If (filesToInclude.Count=0) Then
\r\nErrorMessage.InnerHtml = ErrorMessage.InnerHtml & "You did not select any files?<br/>\\n"
\r\nElse
\r\n Response.Clear
Response.BufferOutput= false
Dim enc as Ionic.Zip.EncryptionAlgorithm = Ionic.Zip.EncryptionAlgorithm.None
If (chkUseAes.Checked) Then
enc = EncryptionAlgorithm.WinZipAes256
End If
Dim c As System.Web.HttpContext = System.Web.HttpContext.Current
Dim ReadmeText As String= String.Format("README.TXT\\n\\nHello!\\n\\n" & _
"This is a zip file that was dynamically generated at {0}\\n" & _
"by an ASP.NET Page running on the machine named '{1}'.\\n" & _
"The server type is: {2}\\n" & _
"The password used: {3}\\n", _
"Encryption: {4}\\n", _
System.DateTime.Now.ToString("G"), _
System.Environment.MachineName, _
c.Request.ServerVariables("SERVER_SOFTWARE"), _
tbPassword.Text, _
enc.ToString )
Dim archiveName as String= String.Format("archive-{0}.zip", DateTime.Now.ToString("yyyy-MMM-dd-HHmmss"))
Response.ContentType = "application/zip"
Response.AddHeader("content-disposition", "filename=" + archiveName)
Using zip as new ZipFile()
' the Readme.txt file will not be password-protected.
'zip.AddEntry("Readme.txt", "", ReadmeText, Encoding.Default)
If Not String.IsNullOrEmpty(tbPassword.Text) Then
zip.Password = tbPassword.Text
zip.Encryption = enc
End If
' filesToInclude is a string[] or List<String>
zip.AddFiles(filesToInclude, "files")
'zip.Save(Response.OutputStream)
zip.Save(sMappedPath & "\\" & archiveName)
End Using
Dim file As System.IO.FileInfo = New System.IO.FileInfo(sMappedPath & "\\" & archiveName) '-- if the file exists on the server
Response.ContentType = "application/zip"
Response.AddHeader("Content-Disposition", "attachment; filename=" & file.Name)
Response.AddHeader("Content-Length", file.Length.ToString())
Response.WriteFile(file.FullName)
'file.Delete()
Response.End() 'if file does not exist
Response.Close()
End If
\r\nEnd Sub
\r\n
</script>
\r\n
<html>
<head>
<link rel="stylesheet" href="style/basic.css">
</head>
<body>
\r\n<form id="Form" runat="server">
\r\n<h3> <span id="Title" runat="server" />Zip Files from ASP.NET </h3>
\r\n <p>This page uses the .NET Zip library (see <a
href="http://DotNetZip.codeplex.com/http://DotNetZip.codeplex.com">http://DotNetZip.codeplex.com/</a>)
to dynamically create a zip archive, and then download it to the
browser through Response.OutputStream. This page is implemented
in VB.NET.</p>
<span class="SampleTitle"><b>Check the boxes to select the files, set a password if you like,
then click the button to zip them up.</b></span>
<br/>
<br/>
Password: <asp:TextBox id="tbPassword" Password='true' Text="" AutoPostBack runat="server"/>
<span style="color:Red">(Optional)</span>
<br/>
<br/>
Use AES?: <asp:CheckBox id="chkUseAes" AutoPostBack runat="server"/>
<br/>
<br/>
<asp:Button id="btnGo" Text="Zip checked files" AutoPostBack OnClick="btnGo_Click" runat="server"/>
<br/>
<br/>
<span style="color:red" id="ErrorMessage" runat="server"/>
<br/>
<asp:ListView ID="FileListView" runat="server">
\r\n <LayoutTemplate>
<table>
<tr ID="itemPlaceholder" runat="server" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr>
<td><asp:Checkbox ID="include" runat="server"/></td>
<td><asp:Label id="label" runat="server" Text="<%# Container.DataItem %>" /></td>
</tr>
</ItemTemplate>
<EmptyDataTemplate>
<div>Nothing to see here...</div>
</EmptyDataTemplate>
</asp:ListView>
\r\n
<br />
<a href="FF_test.zip">FF_test.zip</a>
<br /><a href="/zipfiles/2010-Jul-29-093041-66.zip">2010-Jul-29-093041-66.zip 166kB</a>
<br /><a href="/zipfiles/archive-2010-Jul-30-053228.zip">archive-2010-Jul-30-053228.zip 122 Mb</a>
<br /><a href="/zipfiles/2010-Jul-29-092808-66.zip">2010-Jul-29-092808-66.zip 284 Mb</a>
</form>
\r\n</body>
\r\n</html>
", "PostedDate": "2010-07-30T05:48:42.79-07:00", "UserRole": null, "MarkedAsAnswerDate": null } ]