I'm developing a app where i have to display filenames in a listbox, files are created by the user and are stored in a directory created using isolated storage. i'm new to windows phone programming. i'm not finding enough resources for isolated storage file access??? Plzzz help
Code for Binding to the list:
private void bindList()
{
var appStorage = IsolatedStorageFile.GetUserStoreForApplication();
string[] fileList = appStorage.GetFileNames("/NotesForBible");
listPicker1.ItemsSource = fileList;
}
COde for adding the file:
{
var appStorage = IsolatedStorageFile.GetUserStoreForApplication();
appStorage.CreateDirectory("NotesForBible");
if (!appStorage.FileExists(fileName))
{
using (var file = appStorage.CreateFile("NotesForBible/" + fileName ))
{
using (var writer = new StreamWriter(file))
{
writer.WriteLine(fileContent);
}
}
}
I'm not able to view the files created in the listbox
IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication();
To get an array of all filenames:
string directory = "whatever";
string[] filenames = store.GetFileNames(directory);
For further information: http://msdn.microsoft.com/en-us/library/system.io.isolatedstorage.isolatedstoragefile.aspx
Related
I am trying to save the stream of image data to a file. I was able to save it to Pictures library though.
But I want to save it to a file in the root of my application/ project.
I was trying the below but it doesn't work.
using (MediaLibrary mediaLibrary = new MediaLibrary())
mediaLibrary.SavePicture(#"\DefaultScreen.jpg", stream);
In this case you should use LocalStorage.
Here is a simple solution to do this:
using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
if (!isoStore.FileExists(fileName)
{
var sr = Application.GetResourceStream(new Uri(fileName, UriKind.Relative));
using (var br = new BinaryReader(sr.Stream))
{
byte[] data = br.ReadBytes((int)sr.Stream.Length);
string strBaseDir = string.Empty;
const string DelimStr = "/";
char[] delimiter = DelimStr.ToCharArray();
string[] dirsPath = fileName.Split(delimiter);
// Recreate the directory structure
for (int i = 0; i < dirsPath.Length - 1; i++)
{
strBaseDir = Path.Combine(strBaseDir, dirsPath[i]);
isoStore.CreateDirectory(strBaseDir);
}
using (BinaryWriter bw = new BinaryWriter(isoStore.CreateFile(fileName)))
{
bw.Write(data);
}
}
}
}
Here you can find all info about data in Windows Phone:
http://msdn.microsoft.com/en-us/library/windowsphone/develop/ff402541(v=vs.105).aspx
In windows phone 7, what is the protocol for updated an isolated storage text file? Say I have 10 words in a text file arranged at 1 per line. Now suppose, the user uses the application and a new word needs to be stored on the fifth line. How do I write to the file, which already contains 10 words with 1 word per line?
Thanks in advance you guys are awesome.
The way I have been doing it is:
Read in a file from IsolatedStorage to menmory
Update the String
Write the file back to storage
Read in File
public static string ReadFromStorage(string filename)
{
string fileText = "";
try
{
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
using (StreamReader sr = new StreamReader(new IsolatedStorageFileStream(filename, FileMode.Open, storage)))
{
fileText = sr.ReadToEnd();
}
}
}
catch
{
}
return fileText;
}
Write to File
public static void WriteToStorage(string filename, string text)
{
try
{
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
string directory = Path.GetDirectoryName(filename);
if (!storage.DirectoryExists(directory))
storage.CreateDirectory(directory);
if (storage.FileExists(filename))
{
MessageBoxResult result = MessageBox.Show(filename + " Exists\nOverwrite Existing File?", "Question", MessageBoxButton.OKCancel);
if (result == MessageBoxResult.Cancel)
return;
}
using (StreamWriter sw = new StreamWriter(storage.CreateFile(filename)))
{
sw.Write(text);
}
}
}
catch
{
}
}
So I would do:
string fileName = "Test.txt";
string testFile = IsolatedStorage_Utility.ReadFromStorage(fileName);
testFile = testFile.Replace("a", "b");
IsolatedStorage_Utility.WriteToStorage(fileName, testFile);
Writing to a file in Isolated Storage is basically a file write operation. It is similar as how you will access a normal file and read write to it in normal operating system. in your scenario if you are sure that you need to update 5th line out of 10 lines, you will read line by line using stream reader and will use stream writer to update the specific line that you want to update. You do not need to re-write all content again and again.
On the other hand if you just want to add new content you can just append it to end of file. You may find this link useful http://goo.gl/IKii5
I am trying to retrieve all the file name under "ScheduleFolder" and place it into a listbox.
How should i go about doing it?
How to let it show into the scheduleListBox?
IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication();
string[] fileNames = myStore.GetFileNames("./ScheduleFolder/*.*");
foreach (string name1 in fileNames)
{
yo = fileNames[0];
}
scheduleListBox.Items.Add(yo);
textBlock1.Text = yo;
Try this snippet
IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication();
string[] fileNames = isf.GetFileNames("./DirectoryName/*.*");
I'll probably use this...
IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication();
string[] fileNames = myStore.GetFileNames("./ScheduleFolder/*.*");
scheduleListBox.ItemsSource = fileNames;
Howdy,
I have a project in VisualStudio which contains a folder 'xmlfiles' below the root node. This folder contains a file 'mensen.xml' which I try to open ...
However when I try to open that very file the debugger steps in and throws an exception.
I tried it with
if(File.Exists(#"/xmlfiles/mensen.xml") )
{
bool exists = true;
}
as well as:
FileStream fs = File.Open("/xmlfiles/mensen.xml", FileMode.Open);
TextReader textReader = new StreamReader(fs);
kantinen = (meineKantinen)deserializer.Deserialize(textReader);
textReader.Close();
Nothin is working :(.
How can I open a local file in the Phone7 Emulator?
If you are just opening it to read it then you can do the following (Assuming you have set the Build Action of the file to Resource):
System.IO.Stream myFileStream = Application.GetResourceStream(new Uri(#"/YOURASSEMBLY;component/xmlfiles/mensen.xml",UriKind.Relative)).Stream;
If you are attempting to read/write this file then you will need to copy it to Isolated Storage. (Be sure to add using System.IO.IsolatedStorage)
You can use these methods to do so:
private void CopyFromContentToStorage(String fileName)
{
IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication();
System.IO.Stream src = Application.GetResourceStream(new Uri(#"/YOURASSEMBLY;component/" + fileName,UriKind.Relative)).Stream;
IsolatedStorageFileStream dest = new IsolatedStorageFileStream(fileName, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write, store);
src.Position = 0;
CopyStream(src, dest);
dest.Flush();
dest.Close();
src.Close();
dest.Dispose();
}
private static void CopyStream(System.IO.Stream input, IsolatedStorageFileStream output)
{
byte[] buffer = new byte[32768];
long TempPos = input.Position;
int readCount;
do
{
readCount = input.Read(buffer, 0, buffer.Length);
if (readCount > 0) { output.Write(buffer, 0, readCount); }
} while (readCount > 0);
input.Position = TempPos;
}
In both cases, be sure the file is set to Resource and you replace the YOURASSEMBLY part with the name of your assembly.
Using the above methods, to access your file just do this:
IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication();
if (!store.FileExists(fileName))
{
CopyFromContentToStorage(fileName);
}
store.OpenFile(fileName, System.IO.FileMode.Append);
The emulator does not have access to the PC file system. You must deploy the file to the target (emulator). The easiest way to do this is mark the file as an embedded Resource. Set the file's Build Action to 'Resource' and then extract it at runtime with code something like this:
var res = Application.GetResourceStream(new Uri([nameOfYourFile], UriKind.Relative))
In Windows Phone 7 how can I save a BitmapImage to local storage? I need to save the image for caching and reload if it is requested again in the next few days.
If you save the file into IsolatedStorage you can set a relative path to view it from there.
Here's a quick example saving a file that was included in the XAP (as a resource) into Isolated Storage.
using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
if (!isoStore.FileExists(fileName)
{
var sr = Application.GetResourceStream(new Uri(fileName, UriKind.Relative));
using (var br = new BinaryReader(sr.Stream))
{
byte[] data = br.ReadBytes((int)sr.Stream.Length);
string strBaseDir = string.Empty;
const string DelimStr = "/";
char[] delimiter = DelimStr.ToCharArray();
string[] dirsPath = fileName.Split(delimiter);
// Recreate the directory structure
for (int i = 0; i < dirsPath.Length - 1; i++)
{
strBaseDir = Path.Combine(strBaseDir, dirsPath[i]);
isoStore.CreateDirectory(strBaseDir);
}
using (BinaryWriter bw = new BinaryWriter(isoStore.CreateFile(fileName)))
{
bw.Write(data);
}
}
}
}
You may also be interested in the image caching converters created by Ben Gracewood and Peter Nowaks. They both show saving images into isolated storage and loading them from there.
Another approach I've used is to pass the stream you retrieve for the image in your xap straight into an isolated storage file. Not a lot of moving parts.
using (var isoStore = IsolatedStorageFile.GetUserStoreForApplication()) {
var bi = new BitmapImage();
bi.SetSource(picStreamFromXap);
var wb = new WriteableBitmap(bi);
using (var isoFileStream = isoStore.CreateFile("pic.jpg"))
Extensions.SaveJpeg(wb, isoFileStream, wb.PixelWidth, wb.PixelHeight, 0, 100);
}