I am working on sub application related changes in web app. My web application is optimized to run with or without virtual directory. For that, I met with a condition that checked whether the incoming URL is having "/" or "/{subapplicationname}/"
To check this case I made a condition like below,
HttpContext.Request.Url.AbsolutePath == Url.Action("/", "/")
Without Subapplication: "/" == "/"
With Subapplication: "/applicationname/" == "/applicationname/"
Well actually, both cases (with and without sub application) passed.
And my doubt is whether Url.Action("/", "/") syntax is correct? or else going for HttpRuntime.AppDomainAppVirtualPath is optimal one?
I have searched over internet and didn't find Url.Action("/", "/") scenario.
Any help is appreciated. Thanks in advance.
Related
Given a query string url of the form "~/folder/page.aspx", is there a way to check if that page exists within the scope of the application?
I'm in a situation where I'm fixing a minor bug where, if a user attempts to log in to the application from a set of publicly accessible application error pages, then they're redirected back to that public error page. I've been asked to have the user be redirected to the main home page if they're logging in to the application from this state.
So far I've fixed the issue by hard coding the paths to the affected pages in a switch statement, checking the querystring against the hardcoded paths. I feel this is hacky and bad, and would love a more dynamic solution, but I can't seem to find one.
Any help would be greatly appreciated.
Edit - Specifically, my preferred solution would simply be to check that the path defined by the query string url (without a priori knowledge of the exact format) leads to a specified folder within the scope of the application.
So, after looking some more, I discovered Server.MapPath. I can use this in conjunction with System.IO.Directory to see if the file is contained within the directory.
string targetUrl = Request.QueryString["redirect"];
string serverUrlPath = Server.MapPath(targetUrl);
string serverDirPath = Server.MapPath("~/ErrorPages");
foreach (string file in Directory.EnumerateFiles(serverDirPath))
{
if (file.Equals(serverUrlPath, StringComparison.OrdinalIgnoreCase))
{
Response.Redirect(Master.ProjectSearchRedirect());
}
}
Response.Redirect(targetUrl);
I was hoping for something a little more refined (even just a Directory.Contains kind of encapsulation).
I am using Directory.GetDirectories() with a Linq statement to loop through all directories in a folder that aren't system folders, however I am discovering a bunch of bad ReparsePoints in the folder, which is causing the method to take a long time as it times out on each bad reparse point.
The code I am currently using looks like this:
subdirectories = directory.GetDirectories("*", SearchOption.TopDirectoryOnly)
.Where(d => ((d.Attributes & FileAttributes.Hidden) != FileAttributes.Hidden)
&& ((d.Attributes & FileAttributes.System) != FileAttributes.System));
I have also tried using code like this for testing, but it also hangs for a full minute or so on the bad folders:
foreach (var item in dir.GetDirectories("*", SearchOption.TopDirectoryOnly))
{
Console.WriteLine(item.Name);
Console.WriteLine(item.Attributes);
}
It should be noted that the above bit of code works fine in .Net 4.0, but in 3.5 it will hang for a minute on each bad reparse point.
Trying to open these folders manually in Windows Explorer results in a "Network Path Not Found" error.
Is there another way to loop through good subfolders inside a folder that doesn't use the Attributes property, or that bypasses the bad reparse points?
I have already tried using Directory.Exists(), and that is equally slow.
According to this answer: *FASTEST* directory listing
For the best performance, it is possible to P/Invoke NtQueryDirectoryFile, documented as ZwQueryDirectoryFile
From MSDN: FILE_REPARSE_POINT_INFORMATION structure
This information can be queried in either of the following ways:
Call ZwQueryDirectoryFile, passing FileReparsePointInformation as the value of FileInformationClass and passing a caller-allocated, FILE_REPARSE_POINT_INFORMATION-structured buffer as the value of FileInformation.
Create an IRP with major function code IRP_MJ_DIRECTORY_CONTROL and minor function code IRP_MN_QUERY_DIRECTORY.
On Windows, I have a C# assembly that is COM visible. It references other assemblies to control an application in the machine. It works fine.
However, under Apache Web Server and using CGI, it doesn't work. After doing some debuging, I found out that the problem is that, while running under Apache's CGI, the environment variables SYSTEMROOT and SYSTEMDRIVE, which aparently are needed by the referenced assemblies, are not loaded.
I can configure Apache to pass those environemtn variables too, but before doing so, I'd really like to know if there's some command I can put on my C# COM visible assembly to make it load environment variables as if it was, let's say, the SYSTEM user or something like that, so it doesn't have to relay on the environment passed by the starting application.
How do you force loading an existent system environment variable in C#, when IT IS NOT SET in the current process (or it was process-deleted by the launching process)?
Thanks in advance for any suggestions!
EDIT 1 - ADDED INFO: Just to make it more clear (as I see in the current answers it's not so clear): Apache intendedly deletes a lot of environment variables for CGI processes. It's not that Apache cannot see them, it can, but it won't pass them to CGI processes.
This should do the trick:
Environment.GetEnvironmentVariable("variable", EnvironmentVariableTarget.Machine);
I did a small test and it is working:
//has the value
string a = Environment.GetEnvironmentVariable("TMP");
Environment.SetEnvironmentVariable("TMP", null);
//does not have has the value
a = Environment.GetEnvironmentVariable("TMP");
//has the value
a = Environment.GetEnvironmentVariable("TMP", EnvironmentVariableTarget.Machine);
SOLUTION: Marco's answer was great and technically answered my question - except that I found out that the environment variables SYSTEMROOT and SYSTEMDRIVE are not really set in the registry where all environment variables are set, so, the chosen answer works for all variables except those two, which I specified in the OP.
SYSTEMROOT is defined on the registry in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRoot, and apparently (after more research), SYSTEMDRIVE is generated as a substring of SYSTEMDRIVE.
So, to get SYSTEMDRIVE and SYSTEMROOT from registry and load them into the environment:
using Microsoft.Win32;
namespace MySpace
{
public class Setup
{
public Setup()
{
SetUpEnvironment();
}
private void SetUpEnvironment()
{
string test_a = Environment.GetEnvironmentVariable("SYSTEMDRIVE", EnvironmentVariableTarget.Process);
string test_b = Environment.GetEnvironmentVariable("SYSTEMROOT", EnvironmentVariableTarget.Process);
if (test_a == null || test_a.Length == 0 || test_b == null || test_b.Length == 0)
{
string RegistryPath = "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
string SYSTEMROOT = (string) Registry.GetValue(RegistryPath, "SystemRoot", null);
if (SYSTEMROOT == null)
{
throw new System.ApplicationException("Cannot access registry key " + RegistryPath);
}
string SYSTEMDRIVE = SYSTEMROOT.Substring(0, SYSTEMROOT.IndexOf(':') + 1);
Environment.SetEnvironmentVariable("SYSTEMROOT", SYSTEMROOT, EnvironmentVariableTarget.Process);
Environment.SetEnvironmentVariable("SYSTEMDRIVE", SYSTEMDRIVE, EnvironmentVariableTarget.Process);
}
}
}
}
Then you can just call Setup setup = new Setup(); from other classes. And that's it. :-)
Environment.GetEnvironmentVariable
see reference here.
e.g.
Environment.CurrentDirectory = Environment.GetEnvironmentVariable("windir");
DirectoryInfo info = new DirectoryInfo(".");
lock(info)
{
Console.WriteLine("Directory Info: "+info.FullName);
}
Are the variables set as system wide?
If they are not, that is what you need to do, otherwise create user variables for the user the COM is running under.
Thank you. I cannot state with any certainty that this has once and for all driven a stake through the heart of the vampire, but amazingly enough, the error has disappeared (for now). The odd thing is that access to the statement
Environment.GetEnvironmentVariable("variable", EnvironmentVariableTarget.Machine);
is a real oddity in the debugger. It does not show up in Intellisense and does not even appear to fire, which leads me to suspect, which you all knew already, that this is some sort of magic runtime object Environment that has no instantiation in the debugger but also can be benignly jumped over. Oh well.
Oh and I should mention that after you see that error, you will note oddities in your Windows OS, which is worrisome. In particular, you will see, if you try to use the Control Panel /System/Advanced Properties (whatever) that it cannot load the dialog for the environment variables any more, indicating that %windir% has been seriously hosed (compromised) across all applications. Bad bad bad....
Sorry if this question is out of context, but I don't know where else to look and StackOverflow tends to provide the best support. I'm having a problem with FlexPaper not loading the locale for HTML rendering option. It appears to be working for Flash version with no problem, but not for the HTML viewer specifically.
Here is the config which loads the control onto a page:
var searchServiceUrl = escape(ashxDir + "containstext.ashx?doc=" + guid + "&page=[page]&searchterm=[searchterm]"),
docUrl = escape("{" + ashxDir + "view.ashx?guid=" + guid + "&numPages=" + numPages +"&format={format}&page=[*,0]," + numPages + "}"),
configObj = {
DOC: docUrl,
...
DocSizeQueryService: ashxDir + "swfsize.ashx?doc=" + guid,
jsDirectory: "/FlexPaper/js/",
JSONDataType: "jsonp",
localeDirectory: "/FlexPaper/locale/",
localeChain: "en_US"
};
This is exactly how I've found it while looking through documentation and everything else, but it simply does not work for me. I've scoured the internet and nobody else seems to have this problem. Unfortunately when I click on the print button all of my labels and buttons show 'null'. Here is a screenshot of what I get when I try to load the page in the HTML viewer:
If you notice in my configuration above, the localeDirectory is set as a sibling directory of the js directory. The locale directory has all of the valid directories under it which hold the localized strings for various languages (ie. en_US, zh_CN, etc..). I've even tried moving the locale directory around the system to see if it is expecting a different "root", but again to no avail...
Any information would be greatly appreciated.
i had that "null" problem in my PHP set up of flex paper in that i put locale & js folder in my location so it is not fetching correct path so i put correct path in default page from where $('#documentViewer').FlexPaperViewer({ defines i just put below paths :
jsDirectory:"http://{xxx}/subdirectory/assets/js/",
localeDirectory:"http://{xxx}/subdirectory/assets/locale/",
may be this will help others
We found the problem and I realize that I never updated the case with the 'Answer'. The fix was directly related to a wrong url which fed the localized strings to the dialog. We were only able to track it down by interrogating the HTTP Request using Chrome Web Tools. It wasn't a complex fix, but it proved to be a complex issue to track down and diagnose properly.
Hope this helps someone someday.
I am trying to find a way to get back my previous variable's value so that I can resume my application to it's previous running state before it crashed when I MANUALLY relaunch it. I am currently using a 'config' file that is saved in the project folder. Is there a better way to do this?
Some small parts of my code that I want to save.
if (EventID == WIA.EventID.wiaEventItemCreated)
{
if (d != null)
{
foreach (Property p in d.Properties)
{
if (p.Name.Equals("Pictures Taken"))
Console.WriteLine("Taken");
}
wiaImageFile = (WIA.ImageFile)(d.Items[d.Items.Count].Transfer(FormatID.wiaFormatJPEG));
wiaImageFile.SaveFile(Properties.Settings.Default.FolderNameRaw + "\\" + imageCount + ".jpg");
imageCount++;//I want to save this count so that I can continue the sequence even after the application crashes
Pluck.Default.PhotoExistsInDirectory = true;
FacebookControls fbc = new FacebookControls();
if(Properties.Settings.Default.UseFB == true)
fbc.UploadPhotos();
}
}
A config file is a good answer in general. Your other options are usually the registry or the database, but I would argue that a config file is a safer option.
The thing about persisting this information is that it may cause an error again, and if so you'll want to be able to discard it easily. A file (of course stored in user settings space) is perhaps the way to do that. If need be you can instruct the user to delete the file. It's a more complicated fix for a user to access the registry or the database.
Also, you should wrap up your state in an appropriate object, and build initialization logic that initializes the state object and has mechanism for not loading for the config file.
I use config files. I also have a global exception handler that catches any exceptions and offers the chance to save any files (including those that the user is working on) before the app closes.
I would also agree with C Ross that you may persist the data that caused the app to fail. Another option that will not get you right back is to persist the settings at regular intervals using a timer or background process. I use this with several backups a bit like the system restore feature in windows.
You can handle UnhandledException, Application_ThreadException and Application.ApplicationExit Event, and try saving your data there:
http://www.switchonthecode.com/tutorials/csharp-tutorial-dealing-with-unhandled-exceptions
As #C. Ross said, user config file is a good choice.
Of course, first you'll have to preserve your application's state in some object during runtime.