I'm trying to read some images that are in a zip in dropbox. So I need to access to this file and get the images, but I don't know what i'm doing wrong. I'm doing like this:
string uri_zip = new Uri(string.Format("My Path of the zip in Dropbox")).AbsoluteUri;
using (ZipArchive zip = ZipFile.Open(uri_zip, ZipArchiveMode.Read))
{
foreach (ZipArchiveEntry entry in zip.Entries)
{
images.Add(entry.Name.Substring(0, entry.Name.LastIndexOf(#".")));
}
}
Any solution?
If you look at ZipFile.Open it says that the first string argument is "The path to the archive to open, specified as a relative or absolute path."
I believe that it doesn't work with the remote, most probably HTTPS URI i.e. it probably won't work with that dropbox URI that you are trying to pass as an argument to the Open() function.
Try to download the file first using HttpClient and then use it from the local file system, or see if the Dropbox API supports working with an archive on the server-side.
Related
I am trying to extract files from zip files using the DotNetZip library. I am able to extract files when it is a single .zip file. However, when I try to extract files from a multi volume zip file like Something.zip.0 or Something.zip.1, I get the following two exceptions:
-Exception thrown: 'Ionic.Zip.BadReadException' in Ionic.Zip.dll
-Exception thrown: 'Ionic.Zip.ZipException' in Ionic.Zip.dll
Is it possible for DotNetZip to read these type of files, or should I be looking into an alternative approach? I am working on Visual Studios using C#.
Here's a snippet of how I implement my zip file extraction.
using (Ionic.Zip.ZipFile zip = Ionic.Zip.ZipFile.Read(_pathToZip))
{
zip.CompressionLevel = Ionic.Zlib.CompressionLevel.BestSpeed;
foreach(Ionic.Zip.ZipEntry ze in zip)
{
string fileName = ze.FileName;
bool isThereItemToExtract = isThereMatch(fileName.ToLower(), _folderList, _fileList);
if (isThereItemToExtract)
{
string pathOfFileToExtract = (_destinationPath + "\\" + ze.FileName).Replace('/', '\\');
string pathInNewZipFile = goUpOneDirectoryRelative(ze.FileName);
ze.Extract(_destinationPath, Ionic.Zip.ExtractExistingFileAction.OverwriteSilently);
_newZip.AddItem(pathOfFileToExtract, pathInNewZipFile);
}
}
_newZip.Save();
}
Please refer the DotNetZipLibrary code examples:
using Ionic.Zip;
private void MyExtract(string zipToUnpack, string unpackDirectory)
{
using (ZipFile zip1 = ZipFile.Read(zipToUnpack))
{
// here, we extract every entry, but we could extract conditionally
// based on entry name, size, date, checkbox status, etc.
foreach (ZipEntry e in zip1)
{
e.Extract(unpackDirectory, ExtractExistingFileAction.OverwriteSilently);
}
}
}
This method should be able to extract either split and not split zip files.
Every zip entry will be extracted with its full path as specified in the zip archive, relative to the current unpackDirectory.
There's no need to check if zip entry exsists (isThereItemToExtract). Interating the zip entries with foreach should do the job.
To avoid collisions you need to check if file with same name as zipEntry exsists in the unpackDirectory, or use ExtractExistingFileAction.OverwriteSilently flag.
Is it possible for DotNetZip to read these type of files, or should I be looking into an alternative approach? I am working on Visual Studios using C#.
In my experience, this is the best library to deal with split zip files.
Ultimately I'm trying to upload a document from the user's file system via MVC .NET web site to Google Drive, which utilizes a service account.
I'm not sure if I'm implementing the appropriate design to accomplish the upload but I am getting hung up on the path of the file to be uploaded.
Web
#Html.TextBox("file", "file", new { type = "file", id = "fileUpload" })
Controller
public ActionResult GoogleDriveList(GoogleDrivePageVM vm, HttpPostedFileBase file)
File _file = new File();
var _uploadFile = System.IO.Path.GetFileName(file.FileName);
byte[] byteArray = System.IO.File.ReadAllBytes(_uploadFile);
Error occurs on the ReadAllBytes statement. It could not find file 'C:\Program Files (x86)\IIS Express\Map of Universe.txt'. The file name is correct but the path is not.
byte[] byteArray = System.IO.File.ReadAllBytes(_uploadFile);
System.IO.MemoryStream stream = new System.IO.MemoryStream(byteArray);
... Google Drive file stuff goes here
Then upload the file from the stream.
FilesResource.InsertMediaUpload request = _service.Files.Insert(body, stream, body.MimeType);
request.Upload();
So, am I going down the right path using the HTML file helper? And if so, what's the trick to get the path to work correctly? Also, I want to be able to support file sizes up to 500 MB (if that makes a difference).
If your getting the filename from a user selected windows file explorer dialog, then you shouldn't be using the below as will just strip out the filename without the path into your upload file variable and I am assuming that bogus path is where your're running the code from, so ReadAllBytes is trying to read from that path with the filename
var _uploadFile = System.IO.Path.GetFileName(file.FileName)
just change so it has that full path and filename you need to use in ReadAllBytes
var _uploadFile = file.FileName
I'm using c# fw4.5.
I have a simple code extracting a zip file.
foreach(ZipArchiveEntry entry in z.entries) //z is a zip file open in ZipArchiveMode.Read
{
entry.ExtractToFile(entry.FullName);
}
The zip file have a directory inside it and all files are inside that directory.
When I look at the z.Entries I see its an array which place [0] is only the directory and [1],[2],[3] are files.
But when its try to do:
entry.ExtractToFile(entry.FullName);
On the first entry, I get an error:
"The filename, directory name or volume label syntax is incorrect".
I can't seems to find out whats wrong. Do I need to anything also for it to open the directory? Maybe because the entry is a directory only the "ExtractToFile(entry.FullName)" can't work?
Thanks in advanced.
According to this MSDN article, the ExtractToFile method expects a path to a file (with an extension) and will throw an ArgumentException if a directory is specified.
Since the first entry in the archive is a directory and you are using its name as the argument, that is why you are having this issue.
Look into the related ExtractToDirectory method, which is used like so:
ZipFile.ExtractToDirectory(#"c:\zip\archive.zip", #"c:\extract\");
In addition to Tonkleton's answer I would suggest that you use a third-party compression library since ZipArchive is not supported for framework versions before the .Net 4.5 framework, might I suggest DotNetZip as mentioned in other questions regarding compression in earlier frameworks on StackOverflow.
Replace your paths:
void Main()
{
var zipPath = #"\\ai-vmdc1\RedirectedFolders\jlambert\Downloads\cscie33chap1and2.zip";
var extractPath = #"c:\Temp\extract";
using (ZipArchive z = ZipFile.OpenRead(zipPath))
{
foreach(ZipArchiveEntry entry in z.Entries) //z is a zip file open in ZipArchiveMode.Read
{
entry.ExtractToFile(Path.Combine(extractPath, entry.FullName), true);
}
}
}
I am using the SharpZip .NET Zip Library to unzip a file found in the Assets/MyZipFolder folder.
I need to get the full path so that I can use the following:
ZipInputStream s = new ZipInputStream(File.OpenRead(_zipFile))
How do I get the path to Assets/MyZipFolder/MyZip.zip to pass to a .NET File.OpenRead command?
From your Context you can simply open a read stream using:
using (var stream = Context.Assets.Open("MyZipFolder/MyZip.zip"))
{
var s = new ZipInputStream(stream);
// do read here ...
}
Be careful that the file is marked as an AndroidAsset for build action, the absolute path is: "file:///android_asset" and remember that file names in android are case sensitive.
I am using Visual Studio C# to parse an XML document for a file location from a local search tool I am using. Specifically I am using c# to query if the user has access to certain files and hide those to which it does not have access. I seem to have files that should return access is true however because not all files are local (IE some are web files without proper names) it is not showing access to files it should be showing access to. The error right now is caused by a url using .aspx?i=573, is there a work around or am I going to have to just remove all of these files... =/
Edit: More info...
I am using right now....
foreach (XmlNode xn in nodeList)
{
string url = xn.InnerText;
//Label1.Text = url;
try
{ using (FileStream fs = File.OpenRead(url)) { }
}
catch { i++; Label2.Text = i.ToString(); Label1.Text = url; }
}
The issue is, when it attempts to open files like the ....aspx?i=573 it puts them in the catch stack. If I attempt to open the file however the file opens just fine. (IE I have read access but because of either the file type or the append of the '?=' in the file name it tosses it into the unreadable stack.
I want everything that is readable either via url or local access to display else it will catch the error files for me.
I'm not sure exactly what you are trying to do, but if you only want the path of a URI, you can easily drop the query string portion like this:
Uri baseUri = new Uri("http://www.domain.com/");
Uri myUri = new Uri(baseUri, "home/default.aspx?i=573");
Console.WriteLine(myUri.AbsolutePath); // ie "home/default.aspx"
You cannot have ? in file names in Windows, but they are valid in URIs (that is why IE can open it, but Windows cannot).
Alternatively, you could just replace the '?' with some other character if you are converting a URL to a filename.
In fact thinking about it now, you could just check to see if your "document" was a URI or not, and if it isn't then try to open the file on the file system. Sounds like you are trying to open any and everything that is supplied, but it wouldn't hurt to performs some checks on the data.
private static bool IsLocalPath(string p)
{
return new Uri(p).IsFile;
}
This is from Check if the path input is URL or Local File it looks like exactly what you are looking for.
FileStream reads and writes local files. "?" is not valid character for local file name.
It looks like you want to open local and remote files. If it is what you are trying to do you should use approapriate metod of downloading for each type - i.e. for HTTP you WebRequest or related classes.
Note: it would be much easier to answer if you'd say: when url is "..." File.OpenRead(url) failes with exception, mesasge "...".