Windows phone 7 silverlight string array in Isolated storage - silverlight

I have an array of strings which I am trying to store in Isolated storage, However I need to store each string in the array in a new file of its own.
Any approach is welcomed.
Thanks.

I do something similar in an app with code roughly along these lines. Though I am serializing objects in an array to json. Same rough idea though.
using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication()) {
for (int i = 0; i < array.Length; i++) {
string fileName = "file" + i.ToString() + ".dat";
using (var stream = file.CreateFile(filename)) {
using (var writer = new StreamWriter(stream)) {
writer.Write(array[i]);
}
}
}
}
Note this is just typed straight in, I may have a mistake in there :)

Your question is a little vauge, but here I go.
What is stopping you from just serializing each string to a file with the index as the name? For example, store stringarray[0] in a file 0.xml.
Just check whether the file exists before trying to read it.

Related

How can I password protect a file regardless of its extension in Java 8 ro Java 10

I have tried doing this by encrypting individual files but I have a lot of data (~20GB) and hence it would take a lot of time. In my test it took 2.28 minutes to encrypt a single file of size 80MB.
Is there a quicker way to be able to password protect that would apply to any any file (text/binary/multimedia)?
If you are just trying to hide the file from others, you can try to encrypt the file path instead of encrypting the whole huge file.
For the path you mentioned: text/binary/multimedia, you can try to encrypt it by a method as:
private static String getEncryptedPath(String filePath) {
String[] tokens = filePath.split("/");
List<String> tList = new ArrayList<>();
for (int i = 0; i < tokens.length; i++) {
tList.add(Hashing.md5().newHasher() // com.google.common.hash.Hashing;
.putString(tokens[i] + filePath, StandardCharsets.UTF_8).hash().toString()
.substring(2 * i, 2 * i + 5)); // to make it impossible to encrypt, add your custom secret here;
}
return String.join("/", tList);
}
and then it becomes an encrypted path as:
72b12/9cbb3/4a5f3
Once you know the real path text/binary/multimedia, any time you want to access the file, you can just use this method to get the real file path 72b12/9cbb3/4a5f3.

Make many dynamic variable (inctance name) with one loop

I have many class in my library almost 300, and I want to generate instance name by loop. In other words I wanna instead of this approach(witch has many code line):
X:This is my problem:
var cm1: Cm1 = new Cm1();
var cm2: Cm2 = new Cm2();
var cm3: Cm3 = new Cm3();
...
use like this approach (less than 10 code lines):
Y:I think this is solution:
for (var i: uint = 1; i < 4; i++)
{
var getChildByName("cm" + i): getChildByName("Cm" + i) = new getChildByName("Cm" + i);
}
but I know above code does not work, is there any way to make them !
-What am I actually trying to solve?
Make many variable by a few line code and save time and size app!
-Why do I have ~300 classes and why are you trying to create them in a loop at once?
This is about to data of request application!
-What do these classes do that you unconditionally need one of each all at the same time?
Because those data would show at first time!
First, it is better to store the classes in an Array or Object rather than an external variable for each item. if you want to access them by name, better to use object:
var classList:Object=new Object();
Then in your loop:
for(var i:uint=1;i<NumberOfClasses;i++){
classList["cm"+i.toString()]=new (getDefinitionByName("Cm"+i.toString()) as Class)();
}
getDefinitionByName is used to make Constructors using String;
Note: if your classes contain a package directory, you should include it. for example:
getDefinitionByName("myclasses.cm.Cm123")();
Then you can access them using Bracket syntax:
classList["cm123"].prop=val;
And don't forget to:
import flash.utils.getDefinitionByName;
I Hope it will help.
EDIT
to use Array instead of object, the loop should be:
for(var i:uint=1;i<NumberOfClasses;i++){
classList[i]=new (getDefinitionByName("Cm"+i.toString()) as Class)();
}
then to access them:
addChild(classList[0]);//0 or any other index;

Is there a way to make the output file of a stream:file?fileName= dynamic?

Given a simple route like this
route.from("direct:foo")
.split()
.tokenize("\n")
.streaming()
.to("stream:file?fileName=target/streaming${header.count}.txt&closeOnDone=true");
which I then trigger with this
#Test
public void splitAndStreamToFile() {
StringBuilder builder = new StringBuilder();
for(int i = 0; i < 500; i++) {
builder.append(i);
builder.append("\n");
}
for(int i = 0; i < 10; i++) {
template.sendBodyAndHeader(builder.toString(), "count", i);
}
}
I get one big file that contains 10 times 500 lines, where I would have hoped to have 10 files that contain 500 lines each.
In other words, it seems that the fileName in the stream:file endpoint is not dynamic. I am wondering if this is at all possible? My google-fu turned up nothing so far.
EDIT:
With Claus' answer, I got it to work like this:
route.from("direct:foo")
.split()
.tokenize("\n")
.streaming()
.recipientList(route.simple("stream:file?fileName=target/streaming${header.count}.txt&closeOnDone=true"));
Its a dynamic to which there is an EIP pattern for:
http://camel.apache.org/how-to-use-a-dynamic-uri-in-to.html
But it could be a good idea to support the file/simple language on the fileName option as the regular file component does. Fell free to log a JIRA ticket about this improvement.
Sourcecode of the StreamProducer looks like it does not support any of the expression languages of Camel yet:
private OutputStream resolveStreamFromFile() throws IOException {
String fileName = endpoint.getFileName();
ObjectHelper.notEmpty(fileName, "fileName");
LOG.debug("About to write to file: {}", fileName);
File f = new File(fileName);
// will create a new file if missing or append to existing
f.getParentFile().mkdirs();
f.createNewFile();
return new FileOutputStream(f, true);
}
See sourecode.
If you need dynamic filenames, you should take a look at the file component, which supports the file language and the CamelFileName header.
In short,
toD uri=stream:file...
will do it.
The "toD" basically translates the "simple" or "file language" before it hits the stream component code...so that works for "fileName=..."

Any Efficient way to parse large text files and store parsing information?

My purpose is to parse text files and store information in respective tables.
I have to parse around 100 folders having more that 8000 files and whole size approximately 20GB.
When I tried to store whole file contents in a string, memory out exception was thrown.
That is
using (StreamReader objStream = new StreamReader(filename))
{
string fileDetails = objStream.ReadToEnd();
}
Hence I tried one logic like
using (StreamReader objStream = new StreamReader(filename))
{
// Getting total number of lines in a file
int fileLineCount = File.ReadLines(filename).Count();
if (fileLineCount < 90000)
{
fileDetails = objStream.ReadToEnd();
fileDetails = fileDetails.Replace(Environment.NewLine, "\n");
string[] fileInfo = fileDetails.ToString().Split('\n');
//call respective method for parsing and insertion
}
else
{
while ((firstLine = objStream.ReadLine()) != null)
{
lineCount++;
fileDetails = (fileDetails != string.Empty) ? string.Concat(fileDetails, "\n", firstLine)
: string.Concat(firstLine);
if (lineCount == 90000)
{
fileDetails = fileDetails.Replace(Environment.NewLine, "\n");
string[] fileInfo = fileDetails.ToString().Split('\n');
lineCount = 0;
//call respective method for parsing and insertion
}
}
//when content is 90057, to parse 57
if (lineCount < 90000 )
{
string[] fileInfo = fileDetails.ToString().Split('\n');
lineCount = 0;
//call respective method for parsing and insertion
}
}
}
Here 90,000 is the bulk size which is safe to process without giving out of memory exception for my case.
Still the process is taking more than 2 days for completion. I observed this is because of reading line by line.
Is there any better approach to handle this ?
Thanks in Advance :)
You can use a profiler to detect what sucks your performance. In this case it's obvious: disk access and string concatenation.
Do not read a file more than once. Let's take a look at your code. First of all, the line int fileLineCount = File.ReadLines(filename).Count(); means you read the whole file and discard what you've read. That's bad. Throw away your if (fileLineCount < 90000) and keep only else.
It almost doesn't matter if you read line-by-line in consecutive order or the whole file because reading is buffered in any case.
Avoid string concatenation, especially for long strings.
fileDetails = fileDetails.Replace(Environment.NewLine, "\n");
string[] fileInfo = fileDetails.ToString().Split('\n');
It's really bad. You read the file line-by-line, why do you do this replacement/split? File.ReadLines() gives you a collection of all lines. Just pass it to your parsing routine.
If you'll do this properly I expect significant speedup. It can be optimized further by reading files in a separate thread while processing them in the main. But this is another story.

AS3: Creating and accessing movieclips from an array

I know there are quite similar questions here, but I haven't found the proper details. What would be helpful is definitely an explanation of the problems, and perhaps a base example, that anyone who searches later may be able to apply. (Not asking that you write it for me, I just find the examples helpful) I don't want to upset anyone and am kind of worried to post in a forum...
I am wondering alternatives to creating a screen based off tiles created from an array. I have been having an issue myself trying to access the movieclips that have been placed on screen, and trying to trace to find a way to reference them hasn't been working.
Anyway, take something basic like an array, and connecting it to movieclips, then how to access the movieclip itself once done. So I have been working on this, and used many different online resources, so I'm sure a lot of this is going to look familiar, just in a much messier way.
This takes the array to make the movieclips appear (Im sure at least one part in here is unnecessary, and I'm thinking I'm doing something wrong here that makes it not work out later) So this works, but feels pretty bulky.
Both are from the same main class file.
function makeWorld (anyMap, tileW, tileH) {
var worldWidth = anyMap[0].length;
var worldHeight = anyMap.length;
var MAP = this.addChild(new mapHolder());
function tiler(MAP, i, j, tileW, tileH, tile)
{
MAP.addChild(tile);
tile.x = (j * tileW);
tile.y = (i * tileH);
}
for (var i = 0; i < worldWidth; ++i) {
for (var j = 0; j < worldHeight; ++j) {
var curTile:int = anyMap[i][j];
if (curTile == 101) {
var tile1 = new tileGround();
tiler (MAP, i, j, tileW, tileH, tile1);
...
else {
var tile3 = new empty();
tiler (MAP, i, j, tileW, tileH, tile3);
}
}}}
Then there is attempting to reference it, where I'm having the issue. I don't know what to call this.MAP.tileGround by, and I have tried many things. I've read it's not such a good idea to reference by name when not very advanced so I wanted to avoid that sort of thing too.
addEventListener (Event.ENTER_FRAME, hits);
function hits (event:Event) {
var tileCatchG:MovieClip = this.MAP.tileGround;
if(tileCatchG.hitTestPoint(this.MAP.Char.x + leftBumpPoint.x, this.MAP.Char.y + leftBumpPoint.y, true)){
leftBumping = true;
} else {
leftBumping = false;
}
...
}
Thank you!
In looking over what you're doing a second time it would appear that you should have a reference to the 2-indexed array that represents the map.
You can create a regular (single indexed) Array at the top of the file like
public var tileArray:Array = [];
Then where you create them push them into the array
var tile1 = new tileGround();
tileArray.push(tile1);
then to reference them all you can just run a simple loop
for each(var tile:MovieClip in tileArray)
{
//Do stuff
if(tile instanceof tileGround)
{
//Do stuff specific to tileGround
}
}

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