[
{
"Id": "138941",
"ThreadId": "41870",
"Html": "Hi, I am having trouble getting the library to create a valid zip file.
\r\nI am working in vb.net in an aspx partial class code page behind. I have pretty much just copied your exmple code and made only minor modification to the output location of the zipfile to use server.Mappath. I get no error reported by the library at runtime. The zip file is actually created in the specified location, but when I try to open it(i have tried in windows explorer, freecommander and with 7zip) I get the following errors:
\r\n
\r\nerror 11002 - Zip file could not be opened
\r\nerror 11036 - The archive is not a valid Zip archive
\r\n
\r\nI can't immediately see that I am doing anything wrong in the code, is this a bug in the library or can you see something that I have missed.
\r\n
\r\nThanks
\r\n
\r\n
\r\n\r\n
\r\n\r\nFunction doZip() As String\r\n
\r\n
\r\n\r\n
\r\n\r\nDim sourceDir As String = Server.Mappath(".\\templates\\temp\\")\r\n
\r\n
\r\n
\r\nDim targetName As String = sourceDir & "myzip.zip"\r\n
\r\n
\r\n\r\n
\r\n\r\nDim ErrorText As String = "OK"\r\n
\r\n
\r\n\r\n
\r\n\r\nTry\r\n
\r\n
\r\n\r\n
\r\n\r\nUsing zip As ZipFile = New ZipFile(targetName)\r\n
\r\nzip.AddFileFromString(
\r\n
\r\n"Readme.txt", "", "Test text")\r\n
\r\nzip.Save()
\r\n
\r\n
\r\nEnd Using\r\n
\r\n
\r\n\r\n
\r\n\r\nCatch ex1 As Exception\r\n
\r\nErrorText = ex1.ToString()
\r\n
\r\n
\r\nEnd Try\r\n
\r\n
\r\n\r\n
\r\n\r\nReturn ErrorText\r\n
\r\n
\r\n
\r\nEnd Function\r\n
\r\n
\r\n",
"PostedDate": "2008-12-09T07:03:22.723-08:00",
"UserRole": null,
"MarkedAsAnswerDate": null
},
{
"Id": "138948",
"ThreadId": "41870",
"Html": "I had this problem when I first started. When creating a zip file, I found it best to do something like this:
\r\n
\r\nUsing zip As ZipFile = New ZipFile()\r\n zip.AddFileFromString("Readme.txt", "", "Test text")\r\n zip.Save(targetName)
\r\n End Using\r\n
\r\n
\r\n
\r\n",
"PostedDate": "2008-12-09T07:14:07.64-08:00",
"UserRole": null,
"MarkedAsAnswerDate": null
},
{
"Id": "138952",
"ThreadId": "41870",
"Html": "Hi John,
\r\n Thanks for your quick reply.
\r\n
\r\nI have tried putting the targetname in the zip.save method instead of the constructor as you suggested, but the result is the same. I still get an invalid zip file.\r\n",
"PostedDate": "2008-12-09T07:22:03.673-08:00",
"UserRole": null,
"MarkedAsAnswerDate": null
},
{
"Id": "138964",
"ThreadId": "41870",
"Html": "ok, this is curious. I have just found that I can get a valid zip if I write it out to the Response.Output stream, but not when writing to a file.
\r\nDoes this throw any light on the problem? I'd much rather have it write to the filesystem.
\r\n
\r\nThanks\r\n",
"PostedDate": "2008-12-09T07:59:08.843-08:00",
"UserRole": null,
"MarkedAsAnswerDate": null
},
{
"Id": "138983",
"ThreadId": "41870",
"Html": "I think I have found a workaround so am posting in-case anyone else gets the same problem.
\r\n
\r\nWhen using the string constructor I got an invalid zip created. This looks to me like it must be a bug in the library.
\r\nIt looks like the stream constructor works ok, so I modified the code to pass in a filestream like so:
\r\n\r\n
\r\n
\r\n
\r\nDim fs As FileStream = File.Create(targetName)\r\n
\r\n
\r\n
\r\nUsing zip As ZipFile = New ZipFile(fs)
\r\n
\r\nand it looks to produce a valid zip now.\r\n
\r\n
\r\n",
"PostedDate": "2008-12-09T08:26:20.547-08:00",
"UserRole": null,
"MarkedAsAnswerDate": null
},
{
"Id": "138989",
"ThreadId": "41870",
"Html": "It might be a permissions problem. My project for which I use this library is a winforms app and I know asp.net can throw some strange permissions into the mix.
\r\n
\r\nI guess the important thing is that it works. Yeah!
\r\n",
"PostedDate": "2008-12-09T08:40:32.58-08:00",
"UserRole": null,
"MarkedAsAnswerDate": null
},
{
"Id": "138994",
"ThreadId": "41870",
"Html": "Thanks John, I think you might be right. It might also be made worse because I'm running Vista as well and everything takes about 3 clicks to approve.
\r\n It's just security gone mad!!
\r\n
\r\nCheers\r\n",
"PostedDate": "2008-12-09T08:49:25.387-08:00",
"UserRole": null,
"MarkedAsAnswerDate": null
}
]