I encounter this exception when I try to updating a record with following statement.
UPDATE GroupTable SET groupId=100 WHERE groupId=101
I tested the statement under SQLite Manager of Firefox plug-in, and it works.
The error message is as following image. It crashed at the os_win_c.cs, the method named getTempname().
Well, I modified the original codes and fixed this bug.
The Path.GetTempPath() doesn't work because the sandbox enviroment. It has no access right.
I fixed by following codes. And it works now.
static int getTempname(int nBuf, StringBuilder zBuf)
{
const string zChars = "abcdefghijklmnopqrstuvwxyz0123456789";
StringBuilder zRandom = new StringBuilder(20);
i64 iRandom = 0;
for (int i = 0; i < 20; i++)
{
sqlite3_randomness(1, ref iRandom);
zRandom.Append((char)zChars[(int)(iRandom % (zChars.Length - 1))]);
}
//! Modified by Toro, 2011,05,10
string tmpDir = "tmpDir";
IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication();
store.CreateDirectory(tmpDir);
//zBuf.Append(Path.GetTempPath() + SQLITE_TEMP_FILE_PREFIX + zRandom.ToString());
zBuf.Append(tmpDir + "/" + SQLITE_TEMP_FILE_PREFIX + zRandom.ToString());
return SQLITE_OK;
}
The above patch will result in an extra folder tmpDir in the isolatedstorage, and the temp files won't be deleted automatically, so it needs to be delete by self. I tried to delete those files in tmpDir in the method of winClose inside os_win_c.cs, and I found it will result in crash when I do VACUUM. Finally, I delete those tmp files when I closed the database. The following is a Dispose method in SQLiteConnection class.
public void Dispose()
{
if (_open)
{
// Original codes for close sqlite database
Sqlite3.sqlite3_close(_db);
_db = null;
_open = false;
// Clear tmp files in tmpDir, added by Toro 2011,05,13
IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication();
string tmpDir = "tmpDir";
if (store.DirectoryExists(tmpDir) == false) return;
string searchPath = System.IO.Path.Combine(tmpDir, "*.*");
foreach (string file in store.GetFileNames(searchPath)) {
store.DeleteFile(System.IO.Path.Combine(tmpDir, file));
}
}
}
Related
Using the below code snippet, we created a file in Android 10, in a sub-folder under getExternalFilesDir(). However, immediately after creation, if we try to take persistableUriPermission, it throws an exception "No such permission exists....".
We need that check to know if that file will be available for read later in a common utility, else we have to make a copy. Please let us know what we might be doing wrong and how to fix this. Appreciate your help.
ParcelFileDescriptor filePFD =
cxt.getContentResolver().openFileDescriptor(Uri.parse(pathFileToSend), "r");
FileDescriptor fd = filePFD.getFileDescriptor();
FileInputStream fIn = new FileInputStream(fd);
File fileBaseFolder = new File(Utils.GetRootDirectory().getAbsolutePath(), Utils.DESTINATION);
if (!fileBaseFolder.exists())
fileBaseFolder.mkdirs();
if (fileBaseFolder.exists()) {
File copyFile = new File(fileBaseFolder.getAbsolutePath(), nameOfFile);
FileOutputStream fOut = new FileOutputStream(copyFile);
byte data[] = new byte[4096];
long total = 0;
int count;
while ((count = fIn.read(data)) != -1) {
total += count;
fOut.write(data, 0, count);
}
fOut.close();
Uri copiedFileUri =
FileProvider.getUriForFile(cxt,
cxt.getString(R.string.file_provider_authority),
copyFile);
if (null != copiedFileUri)
{
try {
/*At this line, an exception is thrown - No persistable permissions exist.. */
cxt.getContentResolver().takePersistableUriPermission(copiedFileUri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
} catch (Exception e) {
e.printStackTrace();
}
}
takePersistableUriPermission() is for Uri values that you get from the Storage Access Framework (e.g., ACTION_OPEN_DOCUMENT). It will not work for FileProvider. And, you do not need permissions to work with getExternalFilesDir() on Android 4.4 and higher.
So for some project i'm working with Xamarin.Forms.
Since one area is just unbearably slow with Xamarin.Forms i've used a CustomRenderer to solve one particular area where a list is involved.
After getting back to the project and upgrading packages, i've suddenly got the weirdest bug.
I am setting "1234" to an EditText, and the EditText.Text Property is suddenly "49505152" - the string is converted to its ascii equivalent.
Is this a known issue? Does anyone know how to fix it?
The cause of the issue was that my EditText had an InputFilter applied and that after updating a package suddenly another code path of FilterFormatted was executed.
public ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart, int dend)
{
var startSection = dest.SubSequenceFormatted(0, dstart);
var insert = source.SubSequenceFormatted(start, end);
var endSection = dest.SubSequenceFormatted(dstart, dest.Length());
var merged = $"{startSection}{insert}{endSection}";
if (ValidationRegex.IsMatch(merged) && InputRangeCheck(merged, CultureInfo.InvariantCulture))
{
StringBuilder sb = new StringBuilder(end - start);
for (int i = start; i < end; i++)
{
char c = source.CharAt(i);
sb.Append(c);
}
if (source is ISpanned) {
SpannableString sp = new SpannableString(sb);
TextUtils.CopySpansFrom((ISpanned)source, start, sb.Length(), null, sp, 0);
return sp;
} else {
// AFTER UPDATE THIS PATH WAS ENTERED UNLIKE BEFORE
return sb;
}
}
else
{
return new SpannableString(string.Empty);
}
}
i am developing application in which i want that if user create folder and if it is already present then folder should automatically renamed by appending number to folder name
suppose server has folder with name Time now if user again creates folder than it new folder will be Time1 again user creates folder with same name(Time or Time1) than new Folder should be created with Time2 and so on... This is what i have done so far but recursion always return wrong value.
public string checkIfExist(String path, String ProgramName, int itteration,out string strFolderName)
{
String uploadPath = "";
strFolderName = "";
String Mappath =HttpContext.Current.Server.MapPath(path);
if (Directory.Exists(Mappath))
{
String Path = HttpContext.Current.Server.MapPath((path + "" + ProgramName.Replace(" ", "_")));
// uploadPath += ++itteration ;
if (Directory.Exists(Path))
{
ProgramName += ++itteration;
strFolderName = ProgramName;
uploadPath = checkIfExist(path, ProgramName, itteration,out strFolderName);
}
}
return ProgramName;
}
Perhaps you could adapt this, to your need. I wrote it on the fly based on a piece of code I remember in an old file manager I was using in some projects, so please test it. This doesn't include creation and so on, based on your example I'm sure you can add that yourself but if you need help just comment below.
The idea is to pass the original name of the directory you want, and then return an appropriate new name if it exists, such as Test(1), Test(2), Test(n). Then once you get the name you need, you can create it directly.
protected string GetUniqueDirectoryName(string dirName)
{
string newDirName = dirName;
for (int i = 1; Directory.Exists(Server.MapPath("PATH_HERE") + newDirName); i++)
{
newDirName = string.Format("{0}({1})", dirName, i);
}
return newDirName;
}
Note: You will need to include System.IO and probably use HttpContext.Current.Server.MapPath instead of Server.MapPath
I don't know if I really understand what you are trying to do, but I think using recursion here is a little overkill. Try something like this:
string dirName = "Time";
int counter = 0;
string dir = dirName;
while(Directory.Exists(dir))
{
dir = String.Format("{0}{1}", dirName, (++counter).ToString());
}
Directory.CreateDirectory(dir);
If files are posted to my webapp, then I read them via MultipartFormDataStreamProvider.FileData.
I Initialize the provider like this:
string root = HttpContext.Current.Server.MapPath("~/App_Data");
var provider = new MultipartFormDataStreamProvider(root);
And the provider nicely stores them as "~App_Data/BodyPart_{someguid}"
But how do I clean up those files after I'm done with them?
I know this question is old, but the best way I found to delete the temporary file was after processing it.
string root = HttpContext.Current.Server.MapPath("~/App_Data");
var provider = new MultipartFormDataStreamProvider(root);
foreach (var file in provider.Files)
{
// process file upload...
// delete temporary file
System.IO.File.Delete(file.LocalFileName);
}
You could delete all files that are older than a certain timespan. e.g.
private void CleanTempFiles(string dir, int ageInMinutes)
{
string[] files = Directory.GetFiles(dir);
foreach (string file in files)
{
var time = File.GetCreationTime(file);
if (time.AddMinutes(ageInMinutes) < DateTime.Now)
{
File.Delete(file);
}
}
}
Then call it with something like:
CleanTempFiles(root, 60); // Delete all files older than 1 hour
I'm trying to drop in sqlite support for saving the score and some flags. I need to open the db if it exists, then init game values based on db. If the db does not exist, I need to create/init it. The code below compiles but crashes for unknown reason.
package mygame;
<snip imports>
import sys.db.Types;
class ScoreDB extends sys.db.Object {
public var id : SId;
public var dbscore1 : SInt;
public var dbsound : SInt;
public var dbscore2 : SInt;
}
class mygame extends Sprite {
<snip var defines>
public function new () {
// start sqlite code
sys.db.Manager.initialize();
// db does exist
// then read values
// currentScore = score1.dbscore1;
// doSound = score1.dbsound;
// doScore = score1.dbscore2;
// db does not exist:
var cnx = sys.db.Sqlite.open("mybase.db");
sys.db.Manager.cnx = cnx;
sys.db.TableCreate.create(ScoreDB.manager);
var score1 = new ScoreDB();
score1.id = 0;
score1.dbscore1 = 0;
score1.dbsound = 0;
score1.dbscore2 = 0;
score1.insert();
currentScore = 0;
doSound = 0;
doScore = 0;
cnx.close();
// end sqlite code
super ();
initialize ();
construct ();
newGame ();
}
I actually just solved the same issue.
The problem is that the app is essentially a .zip file and cannot be edited. You need to create (and later access) the DB in the app storage directory.
To access the directory use following code:
private static var localStoragePath:String = openfl.utils.SystemPath.applicationStorageDirectory;
There is a known bug that the IDE's don't show the SystemPath class, but don't mind it, it will compile without problem.
Later, with your common tools you can read and write the directory, create new folders etc.
Here's a quick test, to make sure it works and doesn't crash:
// creating a test folder
sys.FileSystem.createDirectory(openfl.utils.SystemPath.applicationStorageDirectory + "/testFolder");
var form:TextFormat = new TextFormat(null, 22, 0xFFFFFF);
// getting contents of the storage dir
var arr = sys.FileSystem.readDirectory(openfl.utils.SystemPath.applicationStorageDirectory);
var tf:TextField = new TextField();
tf.defaultTextFormat = form;
tf.width = Lib.current.stage.stageWidth;
tf.height = Lib.current.stage.stageHeight;
tf.multiline = true;
tf.wordWrap = true;
tf.text = arr.toString();
addChild(tf);
as you'll see, the newly created folder is there. You can delete the line that creates the folder and you'll see it's safe.
Oh, an don't forget to add Android permissions in the XML file:
<android permission="android.permission.WRITE_EXTERNAL_STORAGE"/>
As far as I know there is no sqlite definitions in openfl. And the ones you use are just normal cpp target definition. I suppose the problem is they don't work on android. Even more: I'm quite sure the api definitions are ok, but it tries to load dll with a wrong name, which probably kills your app without even letting out an error. Try to look into implementation(it is short and easy to understand) and change the dll name.