My code access a file which is in "Conf" directory inside my project directory. I am currently opening the file using absolute path like below:
File.ReadAllLines("C:\project name\Conf\filename");
I was thinikng if it's possible to use the relative path like
File.ReadAllLines("/Conf/filename");
But it's not working; as expected it throws exception. I did checked MSDN (link below) but seems "ReadAllLines()" methods doesn't accept relative path.
http://msdn.microsoft.com/en-us/library/s2tte0y1.aspx
Any idea, how can I use the relative path instead using absolute path?
Thanks,
Rahul
This is my favorite way of doing it.
Make your file an embedded resource.
/// <summary>
/// This class must be in the same folder as the embedded resource
/// </summary>
public class GetResources
{
private static readonly Type _type = typeof(GetResources);
public static string Get(string fileName)
{
using (var stream =
_type.Assembly.GetManifestResourceStream
(_type.Namespace + "." + fileName))
{
if (stream != null)
using (var reader = new StreamReader(stream))
{
return reader.ReadToEnd();
}
}
throw new FileNotFoundException(fileName);
}
}
As stated in MSDN you cannot use a relative path, however you might be able to use either Environment.CurrentDirectory or System.Reflection.Assembly.GetExecutingAssembly().Location
To make things simple, use the following:
string current_path = System.IO.Path.GetDirectoryName(Application.ExecutablePath);
string[] lines_from_file = System.IO.File.ReadAllLines(current_path + "/Conf/filename");
...additional black magic here...
Related
I want to let user to download a file from server.
I looked up for the solution and when trying to make an example - ended up with this:
#Route("test-download")
public class Download extends VerticalLayout {
public Download() {
Anchor downloadLink = new Anchor(createResource(), "Download");
downloadLink.getElement().setAttribute("download", true);
add(downloadLink);
}
private AbstractStreamResource createResource() {
return new StreamResource("/home/johny/my/important-file.log", this::createExportr);
}
private InputStream createExportr(){
return null;
}
}
Which is giving java.lang.IllegalArgumentException: Resource file name parameter contains '/' when I go to the page in browser.
How do I make a download button (or anchor) knowing file location on disk?
Have a look at the documentation, paragraph "Using StreamResource". The first parameter is just a file name that will be used by the browser to propose that file name to the user when downloading. So you could pass it like "important-file.log". The content of the download is provided by the InputStream parameter. For instance, you could read from your file, see here:
File initialFile = new File("src/main/resources/sample.txt");
InputStream targetStream = new FileInputStream(initialFile);
I'm using SimpleFileVisitor to search for a file. It works fine on Windows and Linux. However when I try using it on Unix like operating systems It doesn't work as expected. I would get errors like this:
java.nio.file.NoSuchFileException:
/File/Location/MyFolder/\u0082\u0096\u0096âĜu0099\u0081\u0097K
\u0097\u0099\u0096\u0097\u0085\u0099Ĝu0089\u0085
It looks like the obtained name is in different character encoding and maybe that is what causing the issue. It looks like in between the obtaining the name and trying to obtain the access to the file, the encoding is getting missed up. This result in calling preVisitDirectory once then visitFileFailed for every file it tries to visit. I'm not sure why the walkFileTree method is doing that. Any idea?
My using for SimpleFileVisitor code looks like this:
Files.walkFileTree(serverLocation, finder);
My SimpleFileVisitor class:
public class Finder extends SimpleFileVisitor<Path> {
private final PathMatcher matcher;
private final List<Path> matchedPaths = new ArrayList<Path>();
private String usedPattern = null;
Finder(String pattern) {
this.usedPattern = pattern;
matcher = FileSystems.getDefault().getPathMatcher("glob:" + pattern);
}
void match(Path file) { //Compare pattern against file or dir
Path name = file.getFileName();
if (name != null && matcher.matches(name))
matchedPaths.add(file);
}
// Check each file.
#Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
match(file);
return CONTINUE;
}
// Check each directory.
#Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
match(dir);
return CONTINUE;
}
#Override
public FileVisitResult visitFileFailed(Path file, IOException e) {
System.out.println("Issue: " + e );
return CONTINUE;
}
Try using "Charset.defaultCharset()" when you create those "file" and "dir" strings you pass around. Otherwise, you could very likely mangle the names in the process of creating those strings to pass them to your visit methods.
You might also check your default encoding on the JVM your are running, if it is out of sync with the file system you are reading, your results will be, err, unpredictable.
What is the correct way to find the absolute path to the App_Data folder from a Controller in an ASP.NET MVC project? I'd like to be able to temporarily work with an .xml file and I don't want to hardcode the path.
This does not work:
[HandleError]
public class HomeController : Controller
{
public ActionResult Index()
{
string path = VirtualPathUtility.ToAbsolute("~/App_Data/somedata.xml");
//.... do whatever
return View();
}
}
I think outside of the web context VirtualPathUtility.ToAbsolute() doesn't work.
string path comes back as "C:\App_Data\somedata.xml"
Where should I determine the path of the .xml file in an MVC app?
global.asax and stick it an application-level variable?
ASP.NET MVC1 -> MVC3
string path = HttpContext.Current.Server.MapPath("~/App_Data/somedata.xml");
ASP.NET MVC4
string path = Server.MapPath("~/App_Data/somedata.xml");
MSDN Reference:
HttpServerUtility.MapPath Method
string path = AppDomain.CurrentDomain.GetData("DataDirectory").ToString();
This is probably a more "correct" way of getting it.
I try to get in the habit of using HostingEnvironment instead of Server as it works within the context of WCF services too.
HostingEnvironment.MapPath(#"~/App_Data/PriceModels.xml");
The most correct way is to use HttpContext.Current.Server.MapPath("~/App_Data");. This means you can only retrieve the path from a method where the HttpContext is available. It makes sense: the App_Data directory is a web project folder structure [1].
If you need the path to ~/App_Data from a class where you don't have access to the HttpContext you can always inject a provider interface using your IoC container:
public interface IAppDataPathProvider
{
string GetAppDataPath();
}
Implement it using your HttpApplication:
public class AppDataPathProvider : IAppDataPathProvider
{
public string GetAppDataPath()
{
return MyHttpApplication.GetAppDataPath();
}
}
Where MyHttpApplication.GetAppDataPath looks like:
public class MyHttpApplication : HttpApplication
{
// of course you can fetch&store the value at Application_Start
public static string GetAppDataPath()
{
return HttpContext.Current.Server.MapPath("~/App_Data");
}
}
[1] http://msdn.microsoft.com/en-us/library/ex526337%28v=vs.100%29.aspx
Phil Haak has an example that I think is a bit more stable when dealing with paths with crazy "\" style directory separators. It also safely handles path concatenation. It comes for free in System.IO
var fileName = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
However, you could also try "AppDomain.CurrentDomain.BaseDirector" instead of "Server.MapPath".
string filePath = HttpContext.Current.Server.MapPath("~/folderName/filename.extension");
OR
string filePath = HttpContext.Server.MapPath("~/folderName/filename.extension");
This way i got the hosting path.
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
namespace IHostingEnvironmentExample.Controllers
{
public class HomeController : Controller
{
private IHostingEnvironment _env;
public HomeController(IHostingEnvironment env)
{
_env = env;
}
public IActionResult Index()
{
var webRoot = _env.WebRootPath;
var file = System.IO.Path.Combine(webRoot, "test.txt");
System.IO.File.WriteAllText(file, "Hello World!");
return View();
}
}
}
https://forums.asp.net/t/1696005.aspx?How+to+get+Local+Server+path+in+mvc
string Index = i;
string FileName = "Mutton" + Index + ".xml";
XmlDocument xmlDoc = new XmlDocument();
var path = Path.Combine(Server.MapPath("~/Content/FilesXML"), FileName);
xmlDoc.Load(path); // Can use xmlDoc.LoadXml(YourString);
this is the best Solution to get the path what is exactly need for now
I have installed Red5 server. I have created a custom application same as oflaDemo. I am able to play videos in /streams folder of my application, my application name is demo.I want to change the directory RED5_HOME/demo/webapps/streams from which my application is accessing videos, to a folder in a shared machine. I am able to change to a directory in local machine, for example "c:\streams". I have achieved this using CustomFileNameGenerator implementing IStreamFilenameGenerator . But I am not able to access a shared folder. Here is my CustomFileNameGenerator class
import java.io.File;
import org.apache.log4j.Logger;
import org.red5.server.api.scope.IScope;
import org.red5.server.api.stream.IStreamFilenameGenerator;
public class CustomFilenameGenerator implements IStreamFilenameGenerator {
Logger log = Logger.getLogger(CustomFilenameGenerator.class);
/** Path that will store recorded videos. */
/public String recordPath = "recordedStreams/";/
/** Path that contains VOD streams. */
public String playbackPath;
/** Set if the path is absolute or relative */
public Boolean resolvesAbsolutePath;
public String generateFilename(IScope scope, String name, GenerationType type) {
// Generate filename without an extension.
return generateFilename(scope, name, null, type);
}
public String generateFilename(IScope scope, String name, String extension, GenerationType type) {
String filename = null;
if (type == GenerationType.PLAYBACK)
{
filename = playbackPath + name;
}
log.info("file Name " + filename);
if (extension != null)
// Add extension
filename += extension;
log.info("Extension and file name " + filename);
return filename;
}
public boolean resolvesToAbsolutePath()
{
log.info("resolvesAbsolutePath" + resolvesAbsolutePath);
return resolvesAbsolutePath;
}
public void setPlaybackPath(String playbackPath) {
this.playbackPath = playbackPath;
}
public void setResolvesAbsolutePath(Boolean resolvesAbsolutePath) {
this.resolvesAbsolutePath = resolvesAbsolutePath;
}
}
Following are properties in my red5-web.properties file:
webapp.contextPath=/demo
webapp.virtualHosts=*, 192.168.1.20, 192.168.1.20:8088, 127.0.0.1:8088, 192.168.1.20:1935
playbackPath=C://streams/
resolvesAbsolutePath=true
Following is the bean definition in my red5-web.xml file
<bean id="streamFilenameGenerator" class="com.abhinow.demo.CustomFilenameGenerator" >
<property name="playbackPath" value="${playbackPath}" />
<property name="resolvesAbsolutePath" value="${resolvesAbsolutePath}" />
</bean>
The above given code is working fine and I am able to playback video in C:\streams folder, but when I have changed the playback path to a shared folder like
/192.168.1.20/streams
it is not working. I am using windows computer. I have also tried by mapping shared folder /192.168.1.20/streams to a network drive using map network drive feature in windows and gave name to that drive as Z:. Then I have tried by giving the path
Z://streams
Now also it is not working.
Any one please help where I am getting it wrong. I have been struggling on it for two days. Please help me to solve this issue.
Thanks a lot in advance.
Did you debug if
generateFilename
is ever called in your application?
The first thing might be to add some log.debug statements to the code and having a look at the red5.log (or std.out).
Sebastian
Try:
public String generateFilename(IScope scope, String name, String extension, GenerationType type) {
...
return playbackPath+filename;
}
In our project we're using the razorgenerator of David Ebbo. This allowed us to move some of our cshtml files to a class library.
What we would like to achieve now is the following:
MyCommonViews has a "MyView.cshtml" in its Views folder.
MyWebProject ALSO has a "MyView.cshtml" in its Views folder.
MyOtherWebProject DOES NOT have a "MyView.cshtml" in its Views folder.
When MyOtherWebProject needs to load MyView.cshtml, it will pick the one which is in the compiled MyCommonViews project. That is what we want.
BUT when MyWebProject needs to load MyView.cshtml, we would like it to pick up the "overridden" MyView.cshtml file which is in the MyWebProject itself.
Is what we want possible and how?
Manu.
I wrote up a hacky solution for our problem. It hacks into the razorgenerators viewengine and removes all appropriate entries from the (private readonly) Dictionary it has.
The code is ran on application start.
Talk is cheap, show me the code:
private static void HackRazorGeneratorToAllowViewOverriding()
{
// first we search for the PrecompiledMvcEngine
var razorGeneratorViewEngine = ViewEngines.Engines.ToList().FirstOrDefault(ve => ve.GetType().Name.Contains("PrecompiledMvcEngine"));
if (razorGeneratorViewEngine == null)
return;
// retrieve the dictionary where it keeps the mapping between a view path and the (view object) type to instantiate
var razorMappings = (IDictionary<string, Type>)ReflectionUtils.GetPrivateReadonly("_mappings", razorGeneratorViewEngine);
// retrieve a list of all our cshtml files in our 'concrete' web project
var files = Directory.GetFiles(Path.Combine(WebConfigSettings.RootPath, "Views"), "*.cshtml", SearchOption.AllDirectories);
// do some kungfu on those file paths so that they are in the same format as in the razor mapping dictionary
var concreteViewPaths = files.Select(fp => string.Format("~{0}", fp.Replace(WebConfigSettings.RootPath, "").Replace(#"\", "/"))).ToList();
// loop through each of the cshtml paths (of our 'concrete' project) and remove it from the razor mappings if it's there
concreteViewPaths.ForEach(vp =>
{
if (razorMappings.ContainsKey(vp))
razorMappings.Remove(vp);
});
}
WebConfigSettings.RootPath contains the path on HD to the root of our web application.
This is a part of our static ReflectionUtils class:
/// <summary>
/// Get a field that is 'private readonly'.
/// </summary>
public static object GetPrivateReadonly(string readonlyPropName, object instance)
{
var field = instance.GetType().GetField(readonlyPropName, BindingFlags.Instance | BindingFlags.NonPublic);
if (field == null)
throw new NullReferenceException(string.Format("private readonly field '{0}' not found in '{1}'", readonlyPropName, instance));
return field.GetValue(instance);
}
This did the trick. We basically force the PrecompiledMvcEngine to "forget" any view which we have in our concrete project.
You can also try CompositePrecompiledMvcEngine from RazorGenerator.Mvc 2.1.0. It was designed for correct support of view overriding within multiple assemblies. Piece of code:
var engine = new CompositePrecompiledMvcEngine(
/*1*/ PrecompiledViewAssembly.OfType<MyCommonViewsSomeClass>(),
/*2*/ PrecompiledViewAssembly.OfType<MyWebProjectSomeClass>(
usePhysicalViewsIfNewer: HttpContext.Current.IsDebuggingEnabled));
ViewEngines.Engines.Insert(0, engine);
VirtualPathFactoryManager.RegisterVirtualPathFactory(engine);
The first line will register all views from the MyCommonViews assembly (~/Views/MyView.cshtml), the second line will register all views from the MyWebProject or MyOtherWebProject assembly.
When it encounters the virtual path, that already has been registered (~/Views/MyView.cshtml from the MyWebProject assembly), it overrides an old mapping with a new view type mapping.
If another project doesn't has view with the same virtual path (MyOtherWebProject) it leaves source mapping unchanged.
There is flag PreemptPhysicalFiles = false which does the magic.
Full sample:
[assembly: WebActivator.PostApplicationStartMethod(typeof(Application.Web.Common.App_Start.RazorGeneratorMvcStart), "Start")]
namespace Application.Web.Common.App_Start
{
public static class RazorGeneratorMvcStart
{
public static void Start()
{
var engine = new PrecompiledMvcEngine2(typeof (RazorGeneratorMvcStart).Assembly)
{
UsePhysicalViewsIfNewer = true, //compile if file changed
PreemptPhysicalFiles = false //use local file if exist
};
ViewEngines.Engines.Add(engine);//Insert(0,engine) ignores local partial views
// StartPage lookups are done by WebPages.
VirtualPathFactoryManager.RegisterVirtualPathFactory(engine);
}
}
}
However there is maybe a small bug:
http://razorgenerator.codeplex.com/workitem/100