I have a windows store application, where I want to check if an image exists on specified URL. If yes, then image will be display, otherwise not.
I've tried File.Exists(), but in that case it gives me error.
The type or namespace name 'File' does not exist in the namespace 'System.IO' (are you missing an assembly reference?)
Though, I have already added System.IO, but still it gives error.
Can anybody please suggest me how to solve this?
There is no System.IO.File namespace in windows .Net for Store Apps. There is something like Windows.Storage.FileIO but no File namespace.
edit:
try something like this:
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("YourURL");
request.Method = "HEAD";
bool pictureExisting;
try {
request.GetResponse();
pictureExisting= true;
} catch {
pictureExisting= false;
}
Related
I'm using Xamarin Studio and GTK#(.NET). I have the following problem:
I've made an app, and I need to(dinamically) download web images(favicons) and display them in a Gtk.Image widget. When I try to do this, I get the following error:
System.ArgumentException: 'myfile.ico' is not a valid resource name of assembly 'myApp, Version=1.0.6742.24722, Culture=neutral, PublicKeyToken=null'.
at at Gdk.PixbufLoader.InitFromAssemblyResource(Assembly assembly, String resource)
at at Gdk.PixbufLoader..ctor(Assembly assembly, String resource)
at at Gdk.Pixbuf..ctor(Assembly assembly, String resource)
at at Gdk.Pixbuf.LoadFromResource(String resource)
It works if i add the favicon, after download,in the resource folder, BUT I need to make this dinamically(if I add a new site, I want to see it's icon there..).
The code:
using (WebClient client = new WebClient())
{
client.DownloadFile(new Uri("https://google.com/favicon.ico",
Directory.GetCurrentDirectory() + "\..\..\Res\google.ico");
}
faviconImage.Pixbuf = Gdk.Pixbuf.LoadFromResource("myApp.Res.myfile.ico");
The image is in the folder(i can see it, it's everything ok) but i cannot use it if i don't include it(manually) in the resource folder....
Please help me :'(
Pixbuf.LoadFromResource only loads image data from an embedded assembly resource. You can not add resources to assemblies after they are created.
To create a Pixbuf from a file, use one the its .ator that supports either a file path to the image or one that uses a file stream.
Something like:
var filePath = Path.Combine(Directory.GetCurrentDirectory(), "myDownloadIcon.ico");
var newPixBuf = new PixBuf(filePath):
faviconImage.Pixbuf = newPixBuf;
I'm currently trying to load embedded ViewComponents from external assemblies.
I've included this in my project file:
<EmbeddedResource Include="Views\**\*.cshtml" />
so when I inspect the actual assembly and run GetManifestResourceNames() I see that the file is embedded.
I'm then calling this method in ConfigureService() in Startup.cs:
public static IMvcBuilder GetModules(this IMvcBuilder mvcBuilder)
{
var embeddedFileProviders = new List<EmbeddedFileProvider>
{
new EmbeddedFileProvider(Assembly.GetCallingAssembly())
};
mvcBuilder.ConfigureApplicationPartManager(apm =>
{
foreach (string modulePath in Directory.GetFiles(Configuration.Settings.Path, "*.Module.dll"))
{
var assembly = Assembly.LoadFrom(modulePath);
var startUpType = (from t in assembly.GetTypes()
where t.GetInterfaces().Contains(typeof(IModuleStartup))
select t).FirstOrDefault();
RegisterModuleServices(mvcBuilder, startUpType);
apm.ApplicationParts.Add(new AssemblyPart(assembly));
embeddedFileProviders.Add(new EmbeddedFileProvider(assembly));
Modules.Assemblies.Add(assembly);
}
var compositeFileProvider = new CompositeFileProvider(embeddedFileProviders);
mvcBuilder.Services.AddSingleton<IFileProvider>(compositeFileProvider);
});
return mvcBuilder;
}
I'm also not using
mvcBuilder.Services.Configure<RazorViewEngineOptions>(o =>
{
o.FileProviders.Add(compositeFileProvider);
});
as this doesn't work at all and the action o.FileProviders.Add(compositeFileProvider) is not even called.
All the embedded file providers are found when I inject IFileProvider but none of the files are found when I run _fileProvider.GetDirectoryContents("");
Does anybody have any idea why?
So i figured out why it wasn't returning anything...
It seems that I didn't set the baseNameSpace parameter when created the new EmbeddedFileProvider. stupid huh.
But there were quite a few examples that didn't set this and it worked.
Hopefully this helps some other people out there if they experience this issue.
Watch also your project root namespace setting. My case was the reverse - I copy-n-pasted a project file and it did not retain the namespace setting from the previous project. This was because I did not explicitly set <RootNamespace>YourNameSpaceNameHere</RootNamespace> in the .csproj settings
(nested under the <PropertyGroup> block at the top), so it took my file name as the namespace! It was quite a "gotcha" moment, and much time lost, to find out my code correctly sets the baseNameSpace parameter, but the whole time the project was storing the files under a different namespace! (you can open the DLL in any text editor, scroll to the bottom, and you should easily be able to make out the embedded text to verify). It was there, just not found. In case someone has this correct, you can also dump ALL files using {Assembly}.GetManifestResourceNames() and make sure your names are correct.
In my case I had '.' (period) in the resource filename.
I had this error in an ASPNET Core 3.0 project, where my external class library had the file correctly embedded, but the web application was not locating them at runtime. It turns out the example I copied from the internet had a namespace provided and I copied that example namespace without considering the implications...
After a bit of research, I was able to fix it by simply using the proper root namespace defined my own Class Library:
var embeddedFileProvider =
new Microsoft.Extensions.FileProviders
.EmbeddedFileProvider(assembly, "ViewComponentLibrary");
changed to
var embeddedFileProvider =
new Microsoft.Extensions.FileProviders
.EmbeddedFileProvider(assembly, "MyProjectLibrary");
We had another root cause leading to this problem. We had migrate our build agents from windows to linux, and FS case-sensitivity of the latter did the trick - it didn't found embedded resources:
<EmbeddedResource Include="swagger\ui\*" />
because on file system we have Swagger\ui\
So the #(EmbeddedResource) path must be the same as the File System path:
<EmbeddedResource Include="Swagger\ui\*" />
(or rename files/directories, to match the #(EmbeddedResource).
I am trying to create a Xamarin Java Binding to the Spotify Android SDK. The SDK is now separated into two parts, one for authentication and one for the player. The former java binding works, however, the seconds gives me an error.
The original question was asked on the Xamarin Forums.
Hi,
I am trying to create a binding project for the Spotify Android SDK.
The SDK is seperated into two .aar files. One for authentication and one for media playback (Player).
Firstly I tried having both .aar files in one Binding Project, but the Player.aar was ignored. However, moving it to its own seem to work.
Now, my issue is related to the Java Interface NativePlayerNotificationCallback which is generated to IPlayerNotificationCallback (hence the lack og Notification), but in the Player class it tried to implement: global::Com.Spotify.Android.Player.INativePlayerNotificationCallback.
I can find no other mention of INativePlayerNotificationCallback in the decompiled files. Only IPlayerNotificationCallback.
I understand that this is a bit difficult to imagine. Here are the java class files seen in JD-GUI:
The generated files are listed here:
Inside the file Com.Spotify.Sdk.Android.Player.IPlayerNotificationCallback.cs:
And the error message itself
Error CS0234: The type or namespace name INativePlayerNotificationCallback' does not exist in the namespaceCom.Spotify.Sdk.Android.Player'. Are you missing an assembly reference?
I would really appreciate any insight as to how I can get this to work. It looks to me like there are some inconsistencies in the naming of the interface, but I am not sure.
Thank you for helping out,
Fredrik
Should be fixed by adding metadata to Player binding project:
<metadata>
<attr path="/api/package[#name='com.spotify.sdk.android.player']/interface[#name='NativePlayerNotificationCallback']" name="visibility">public</attr>
</metadata>
and Player class extension (into the Additions directory):
using System.Collections;
using Java.Lang;
using Java.Util.Concurrent;
namespace Com.Spotify.Sdk.Android.Player
{
public partial class Player
{
public IList InvokeAll(ICollection tasks)
{
return null;
}
public IList InvokeAll(ICollection tasks, long timeout, TimeUnit unit)
{
return null;
}
public Object InvokeAny(ICollection tasks)
{
return null;
}
public Object InvokeAny(ICollection tasks, long timeout, TimeUnit unit)
{
return null;
}
}
}
You will probably need to implement these methods correctly by calling generic methods.
Also I had to add metadata to Auth library binding project (I found it in your old topics) and referenced Auth project from Player project as it uses some of the classes (maybe that's no necessary).
How can I view the request body in ASP.NET Web API from Visual Studio? In ASP.NET MVC, you can use QuickWatch to inspect the Request object and view the content of the body and any posted form data. From what I read, ASP.NET Web API doesn't allow you to read the body more than once.
This is very annoying to deal with when trying to figure out why a specific value wasn't bound correctly. Is there a quick way to do this without setting up tracing/logging?
The easiest it to install Fiddler. Then you will see everything that gets sent over the wire and inspect not only the request payload but the HTTP headers as well. And if you are consuming the API from javascript, things like FireBug, Chrome Developer Toolbar and IE Developer Tools will show you all network requests made by the website.
If you absolutely must inspect the traffic on the server then if you are hosting your Web API inside an ASP.NET application you could put the following line in your immediate window:
new StreamReader(HttpContext.Current.Request.InputStream).ReadToEnd()
if you need body >> Form-data
Post localhost:53356/api/carparksapi/GetRecod
key=jsonRequest and value=[{"abcd":"zxxx"}]
// API -Controller Method ::
var httpContext = (HttpContextWrapper)Request.Properties["MS_HttpContext"];
var foo = httpContext.Request.Form["jsonRequest"];
return foo; //This is value passed in request
For ASP.NET Core use this in the immediate window:
new System.IO.StreamReader(Request.Body).ReadToEnd()
For me #DarinDimitrov answer gave
error CS0246: The type or namespace name 'StreamReader' could not be found (are you missing a using directive or an assembly reference?)
Adding namespace did it
new System.IO.StreamReader(HttpContext.Current.Request.InputStream).ReadToEnd()
Hope this saves you some time
For me #Matas Vaitkevicius answer gave
error CS1061: 'HttpContextBase' does not contain a definition for
'Current' and no extension method 'Current' accepting a first argument
of type 'HttpContextBase' could be found (are you missing a using
directive or an assembly reference?)
Replacing HttpContext.Current with System.Web.HttpContext.Current did it for me
new System.IO.StreamReader(System.Web.HttpContext.Current.Request.InputStream).ReadToEnd()
Hope this saves you some time
Any of these answers could work if the position of the steam is at position 0.
HttpContext.Current.Request.InputStream.Position = 0;
var body = new StreamReader(HttpContext.Current.Request.InputStream).ReadToEnd();
Hi i am making a simple component in joomla having name image detail and i have to upload that image how can i upload image from backend. which one is better using extension or make custom. can you please share any good article for it. i have searched many more but due to lack of idea on joomla cannot find. hope you genius guys help me.
thanks i advance
Joomla Component for the exact scenario of your requirement will be very hard to find out. So you've two options:
1. Make your own component
2. Customize other similar type of component like gallery component
For uploading file from joomla component on admin if you're making your own component:
1. Just use move_uploaded_file php function.
2. copy this code, for joomla's standard fxn :
function upload($src, $dest)
{
jimport('joomla.client.helper');
$FTPOptions = JClientHelper::getCredentials('ftp');
$ret = false;
$dest = JPath::clean($dest);
$baseDir = dirname($dest);
if (!file_exists($baseDir)) {
jimport('joomla.filesystem.folder');
JFolder::create($baseDir);
}
if ($FTPOptions['enabled'] == 1) {
jimport('joomla.client.ftp');
$ftp = & JFTP::getInstance($FTPOptions['host'], $FTPOptions['port'], null, $FTPOptions['user'], $FTPOptions['pass']);
$dest = JPath::clean(str_replace(JPATH_ROOT, $FTPOptions['root'], $dest), '/');
if (is_uploaded_file($src) && $ftp->store($src, $dest))
{
$ret = true;
unlink($src);
} else {
JError::raiseWarning(21, JText::_('WARNFS_ERR02'));
}
} else {
if (is_writeable($baseDir) && move_uploaded_file($src, $dest)) { // Short circuit to prevent file permission errors
if (JPath::setPermissions($dest)) {
$ret = true;
} else {
JError::raiseWarning(21, JText::_('WARNFS_ERR01'));
}
} else {
JError::raiseWarning(21, JText::_('WARNFS_ERR02'));
}
}
return $ret;
}
If you want to use other's component and edit it according to need, download it:
http://prakashgobhaju.com.np/index.php?option=com_showcase_gallery&view=items&catid=1&Itemid=64
Remember it's a gallery component.
Uploading any file be it an image on your Joomla site is something which is so simple, and can be done using either the web based FTP and or the desktop FTP services like filezilla but only when you have saved the file you want to upload. Using the web based way, you need to log in to your host for example 000webhost, locate the file manager option, click on it and enter your domain username and password. Then go to public_html folder , create a new folder for your photos or images and click on upload. Locate your image and click on the tick link to start uploading.
Using the desktop way, you will need to unzip your file to add to joomla, open your FTP client like filezilla, locate the file on local host, input your log in details as provided by your host and once you are logged in to your account through filezilla, locate where you want to add the file and click on upload.
You can find a similar tutorial with regard here http://www.thekonsulthub.com/how-tos/how-to-upload-joomla-with-filezilla-to-your-hosting-servers-cpanel/ {entire thing}
Please please please make sure you use the filtering available in the MediaHelper. Specifically never trust uploaded images, always check first that they are valid file types, then that they are in the list of approved types of files listed in your global configuration, that the names do not contain html or javascript, and that the files themselves do not contain code. In particular I would recommend the MediaHelper::canUpload method which will check the majority of these things for you. If anything you should be checking even more strongly. Also make sure that you are checking whether the user has permission to upload. If anything you should make the checking even more restrictive. Use the APIs that joomla gives you, such as the built in media field.