I am creating a C# UWP App, which creates files with broadFileSystemAccess capability.
Creating and writing to the file is no problem, but reading it fails with error message "Access to the path is denied even when I use storageFile.Path after writing it (so path is guaranteed to be correct and I can open the file in a text editor without problem).
Can anyone tell me, what I may can do to fix the problem?
Kind regards,
Wolfgang
Now I use following code to create a StorageFile, which can be read by my UWP app:
public static async Task<StorageFile> CreateStorageFileFromPath(string filepath)
{
string path = Path.GetDirectoryName(filepath);
string filename = Path.GetFileName(filepath);
var folder = await StorageFolder.GetFolderFromPathAsync(path);
return await folder.GetFileAsync(filename);
}
Kind regards,
Wolfgang
Related
I have an application that needs to load an add-on in the form of a dll. The dll needs to take its configuration information from a configuration (app.config) file. I want to dynamically find out the app.config file's name, and the way to do this, as I understand , is AppDomain.CurrentDomain.SetupInformation.ConfigurationFile
However, since it is being hosted INSIDE a parent application, the configuration file that is got from the above piece of code is (parentapplication).exe.config. I am not able to load another appdomain inside the parent application but I'd like to change the configuration file details of the appdomain. How should I be going about this to get the dll's configuration file?
OK, in the end, I managed to hack something together which works for me. Perhaps this will help;
Using the Assembly.GetExecutingAssembly, from the DLL which has the config file I want to read, I can use the .CodeBase to find where the DLL was before I launched a new AppDomain for it. The *.dll
.config is in that same folder.
Then have to convert the URI (as .CodeBase looks like "file://path/assembly.dll") to get the LocalPath for the ConfigurationManager (which doesn't like Uri formatted strings).
try
{
string assemblyName = Assembly.GetExecutingAssembly().GetName().Name;
string originalAssemblyPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
Uri uri = new Uri(String.Format("{0}\\{1}.dll", originalAssemblyPath, assemblyName));
string dllPath = uri.LocalPath;
configuration = ConfigurationManager.OpenExeConfiguration(dllPath);
}
catch { }
I basically downloaded a file name custom.mp3 into my isolatedstorage and I can see it via isolatedstorage explorer....
The question here is... How can I access the particular custom.mp3 via URI?
So far I got this.. but I wonder why it is not working:
alarm.Sound = new Uri("isostore:/custom.mp3", UriKind.Absolute);
Your path is wrong. Nothing else is wrong with your code. Post the code you're using for saving the mp3 file in the first place, if you want further help.
For easier reading, the code to store the MP3 goes something like this..
string alarmfile = "custom.mp3";
isolatedStorageFileStream = new IsolatedStorageFileStream(alarmfile,FileMode.Create,isolatedStorageFile);
long songfilelength = (long) e.Result.Length;
byte[] songbyte = new byte[songfilelength];
e.Result.Read(songbyte, 0, songbyte.Length);
isolatedStorageFileStream.Write(songbyte, 0, songbyte.Length);
isolatedStorageFileStream.Flush();
Only files packaged in the XAML can be used as alarm sound:
Remarks
The Sound URI must point to a file packaged in the application’s .xap
file. Isolated storage is not supported. When the alarm is launched,
the sound is played quietly and then gradually increases in volume.
There is no way to modify this behavior.
From:
Alarm.Sound Property
Im writing WPF application and want to add ability to call jump list and open program configuration, app.config or log directory from it. Is it possible(cant find the way to do that..just JumpTasks with application path and JumpPath with path to file, and not just path to be opened via explorer)?
Found answer here. Seems that JumpList wasnt designed for opening anything but files or applications, associated with current program. So that when we see directories in explorer tasklist -it actually means: use explorer with parameters. By the way ill try to use it.
Update
made it with such code:
string explorerPath = #"%windir%\explorer.exe";
JumpTask path = new JumpTask
{
CustomCategory = "Paths",
Title = "Open program directory",
IconResourcePath = explorerPath,
ApplicationPath = explorerPath,
Arguments = #"/root," + AppDomain.CurrentDomain.BaseDirectory,
Description = AppDomain.CurrentDomain.BaseDirectory
};
Im leaving this answer here, because someone can have similar incomprehension.
I've parsed these files in regular C# applications, but the IO methods for the files are different in Silverlight, and I can't seem to find the right methods. Searches haven't turned up any information I can use. For the real application I'll be receiving XML from the server, but for the prototype I just need to parse a file with some sample data in it.
You can save the Excel file as XML. An example can be found in this link
This way you can keep your import procedure the same and process the data as when you go live.
To access files from the user's machine you are required to use the OpenFileDialog and SaveFileDialog. Without elevated trust (requires out of browser apps) you will not be able to know anything more than the filename the user selected for input/saving; you will have no idea what the path is to this file. This function can only be called as the result of a user taking an action such as clicking a button; otherwise it will fail because Silverlight does not want malicious code prompting a user with annoying dialogs automatically.
To do this you would do something as follows:
var openFile = new OpenFileDialog();
if ( open.ShowDialog() == true ) // Sadly this is a nullable bool so this is necessary
{
using( Stream myStream = openFile.File.OpenRead() )
using ( var reader = new StreamReader( myStream ))
{
...
}
}
I need to write string to an xml file in Silverlight. When I used the following code, the above mentioned exception "Attempt to access the method failed: System.IO.StreamWriter..ctor(System.String, Boolean)" has occurred.
using (StreamWriter sw = new StreamWriter("C:\Test.xml", false))
{
sw.Write(root.ToString());
}
Can anyone help me out in doing writing to xml file in Silverlight?
Silverlight is in a sandboxed mode where it has restricted access. You can write to "Isolated Storage", but you cannot create files on their hard drive.
http://msdn.microsoft.com/en-us/library/system.io.isolatedstorage.isolatedstoragefile(VS.95).aspx
http://forums.silverlight.net/forums/p/22011/77243.aspx