File.exists() returns false even when the file exists
hi,
the exists() function of java.io.File function returns false even when the file exists on the file system. why is this? i checked the path of the file which gives me the correct path, but exists returns false. can anyone help?
post some of the code you�re using - then maybe I can help you out
//Anders
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Ok so each character rolled with my app gets saved as an html file in a folder i create on the sdcard called RpgApp
the code to do this is
private async Task saveToHtmlCharacter(string name)
StorageFolder externalDevices = Windows.Storage.KnownFolders.RemovableDevices;
StorageFolder sdcard = (await externalDevices.GetFoldersAsync()).FirstOrDefault(); //Windows.Storage.ApplicationData.Current.LocalFolder;
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CreationCollisionOption.OpenIfExists);
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//trimed for the post
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now the next step is to have the app read the names of each of those html files and create a seperate button for each one named for the filename and with the filename as content (later i will link them up to load the html file they are named for in a webbrowser
panal)
here is the code that *should* do that
private async Task readFiles()
z.test.Clear();
StorageFolder externalDevices = Windows.Storage.KnownFolders.RemovableDevices;
StorageFolder folder = (await externalDevices.GetFolderAsync("RpgApp"));
IReadOnlyList<StorageFile> fileList = await folder.GetFilesAsync();
//z.test.Add("dummy");
foreach (StorageFile file in fileList)
z.test.Add(file.Name);
public async void buttonTest()
await readFiles();
CoreDispatcher dispatcher = CoreWindow.GetForCurrentThread().Dispatcher;
await dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
foreach (string name in z.test)
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button1.Height = 75;
button1.Content = name;
button1.Name = name;
testStackPanal.Children.Add(button1);
now i say should as what i get is an error of "A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.ni.dll" (2 of them in fact one after another)
more detailed error is at http://pastebin.com/3hBaZLQ9
now i went through checking line after line to find the error and line that causes it is:
StorageFolder folder = (await externalDevices.GetFolderAsync("RpgApp"));
in the readFiles method
i checked to make sure the case is right etc and its spot on, that IS the folder name, and remember my app creates that folder and creates the files that are inside that folder (and only files my app creates are in that folder) so it should have access
im 100% stuck its taken me all day to get the files to save and now i cant get them to list correctly
I have tested the button creation function with fake list data and that worked fine, as i say the error is when i tell it to look at the folder it created
all help most greatfully recievedthis was actually solved for me on another forum thread
async Task<bool> continueToReadAllFiles(StorageFolder folder)
if (folder == null)
return false;
if (folder.Name.Equals("RpgApp", StringComparison.CurrentCultureIgnoreCase))
var files = await folder.GetFilesAsync();
foreach (var file in files)
test.Add(file.Name);
return false;
var folders = await folder.GetFoldersAsync();
foreach (var child in folders)
if (!await continueToReadAllFiles(child))
return false;
return true;
public async void buttonTest()
test.Clear();
StorageFolder externalDevices = Windows.Storage.KnownFolders.RemovableDevices;
var folders = await externalDevices.GetFoldersAsync();
foreach (var folder in folders)
if (!await continueToReadAllFiles(folder))
break;
//.... commented out
...now i say solved this is more a workaround...but it works.
I would love to know why we cant just scan the RpgApp folder instead of having to scan the whole dc card and disregard all thats not in the RpgApp folder
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