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C#: Make program run even though it's minimized

I'm programming an application (WM 6.1) that should do things regardless if the program is active or minimized (user pressed the X button). This is where my problem occurs, my program is set on "pause" when the program is minimized. I need it to run even though it's in the background. How to solve this?

threads
Hi Pytagoras,
I haven´t made a lot of C# programs, but I think that only the main thread is pause when the program is minimized, but the additional threads don´t. So if you need something running on background you need to implement it on an additional thread...
See you
Pytagoras said:
I'm programming an application (WM 6.1) that should do things regardless if the program is active or minimized (user pressed the X button). This is where my problem occurs, my program is set on "pause" when the program is minimized. I need it to run even though it's in the background. How to solve this?
Click to expand...
Click to collapse

Thanks for your reply
I'm new to threads, haven't really needed them before. So I found some examples:
Code:
class ThreadTest {
private void frmProgram_Load(object sender, EventArgs e)
{
Thread t = new Thread (WriteY);
t.Start(); // Run WriteY on the new thread
}
static void WriteY() {
while (true) Console.Write ("y"); // Write 'y' forever
}
}
Of course I loaded my own method instead of the WriteY example method described here. The thread get started in the Load event of the main form, so it should execute. However, it doesn't work when the program is minimized, and with this thread way of doing it, it doesn't work when it's opened either. (the program should notice a sms ticking in, and do something based on it).
Any help would be greatly appreciated (there should be a dedicated forum on xda for this kind of things / different programming languages..just a comment)

Try something like this... should work...
Code:
class ThreadTest {
private Thread t;
private void frmProgram_Load(object sender, EventArgs e)
{
t = new Thread(new ThreadStart(WriteY));
t.IsBackGround = true;
t.Start();
}
static void WriteY() {
while (true) Console.Write ("y"); // Write 'y' forever
}
}

Strange, it still don't work. I even tried with the code you posted without changing any of it, and still it don't run. It won't even write to the console

The issue is that the console.write is not showing on "Output Window"... see the code below... that it keeping update the file even if minimized...
Code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.IO;
namespace ThreadTest
{
public partial class Form1 : Form
{
private Thread t;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
t = new Thread(new ThreadStart(WriteY));
t.IsBackground = true;
t.Start();
}
private void WriteY()
{
while (true)
{
FileStream fs = new FileStream("\\test.txt", FileMode.Create);
StreamWriter w = new StreamWriter(fs, Encoding.UTF8);
w.WriteLine(DateTime.Now.ToString());
w.Flush();
w.Close();
fs.Close();
}
}
}
}

Thank you for your help, but I get this when I run your code:
System.IO.IOException:
"The process can not access the file '\\test.txt' because it is being used by another process."

The possibility for that is that you are running the example more than once...
Pytagoras said:
Thank you for your help, but I get this when I run your code:
System.IO.IOException:
"The process can not access the file '\\test.txt' because it is being used by another process."
Click to expand...
Click to collapse

Ok, I don't know that went wrong, but I've created a new project, and here it worked.
However, it doesn't work with the sms detection I try to implement.
I'll post the code hoping anyone have some hints:
Code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.IO;
using Microsoft.WindowsMobile.PocketOutlook;
using Microsoft.WindowsMobile.PocketOutlook.MessageInterception;
namespace BackgroundTestApp
{
public partial class Form1 : Form
{
private Thread t;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// Start a new thread hoping that this will detect sms even if it's minimized
t = new Thread(new ThreadStart(startMessageDetection));
t.IsBackground = true;
t.Start();
// This works, but only when the program isn't minimized
//startMessageDetection();
}
/// <summary>
/// Load the message detection (sms)
/// </summary>
private void startMessageDetection()
{
MessageInterceptor messageInterceptor = new MessageInterceptor();
messageInterceptor.InterceptionAction = InterceptionAction.NotifyAndDelete;
messageInterceptor.MessageReceived += new MessageInterceptorEventHandler(messageRecieved);
}
void messageRecieved(object sender, MessageInterceptorEventArgs e)
{
if (e.Message is SmsMessage)
{
MessageBox.Show("Message recieved!");
}
}
}
}

Hi Pytagoras,
Sorry, with this part I can´t help you... never coded using this class...
See you,
Pytagoras said:
Ok, I don't know that went wrong, but I've created a new project, and here it worked.
However, it doesn't work with the sms detection I try to implement.
I'll post the code hoping anyone have some hints:
Code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.IO;
using Microsoft.WindowsMobile.PocketOutlook;
using Microsoft.WindowsMobile.PocketOutlook.MessageInterception;
namespace BackgroundTestApp
{
public partial class Form1 : Form
{
private Thread t;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// Start a new thread hoping that this will detect sms even if it's minimized
t = new Thread(new ThreadStart(startMessageDetection));
t.IsBackground = true;
t.Start();
// This works, but only when the program isn't minimized
//startMessageDetection();
}
/// <summary>
/// Load the message detection (sms)
/// </summary>
private void startMessageDetection()
{
MessageInterceptor messageInterceptor = new MessageInterceptor();
messageInterceptor.InterceptionAction = InterceptionAction.NotifyAndDelete;
messageInterceptor.MessageReceived += new MessageInterceptorEventHandler(messageRecieved);
}
void messageRecieved(object sender, MessageInterceptorEventArgs e)
{
if (e.Message is SmsMessage)
{
MessageBox.Show("Message recieved!");
}
}
}
}
Click to expand...
Click to collapse

I don't know what's happening, but I don't like the fact that messageInterceptor is local to startMessageDetection(). The thread will not continue forever, since it is not looping... the three operations in startMessageDetection() will be performed and the thread will cease. I would make messageInterceptor a member of the form, assign it in startMessageDetection(), and try it without the thread. Does this work?

try making it a process instead of an application. Processes are ment to be running in the background.

[APP] Shark for Root + SharkReader

There were AndroShark, tool for capturing traffic on Android. But there were no newer releases and it seems that original developer dropped project. I liked this tool and used it a lot. But it was set to expire... So there was no simple capture tools available... http://forum.xda-developers.com/showthread.php?t=675206 is home of AndroShark.
So I made Shark for Root, alternative for AndroShark. Some people asked for possibility to see packets on phone, and for that purpose SharkReader has created (first, "quick and dirty" release).
Shark for Root
With tcpdump http://swapper.n3o.lv/lv.n3o.shark_1.0.2.apk
Native http://swapper.n3o.lv/lv.n3o.sharknative_1.0.2.apk
SharkReader - unstable...
(note - run Shark Updater to get traffic analysator)
http://swapper.n3o.lv/lv.n3o.sharkreader_0.1.6.apk
Older versions http://swapper.n3o.lv/

EPIC
Thank you!

If you press stop, it doesn't truly stop. tcpdump seems like it is still going in the background. The file will continue getting larger and larger even though it has been told to stop capturing.
Running CyanogenMod 6 RC1.

Thank you.
Far as I can tell it's working good, Thanks for the reader, helps a lot, I can see this program becoming a portable wireshark app for android, keep up the great work and thank you.

Awesome start!! Thanks!
Sent from my Nexus One using XDA App

does this program work with rooted x10? i clcik on start and all i see is "not found".. my parameters are empty is this also correct ?
thanks

cool app! thanks!

duffy1807 said:
does this program work with rooted x10? i clcik on start and all i see is "not found".. my parameters are empty is this also correct ?
thanks
Click to expand...
Click to collapse
Default parameters are -vv -s 0
Can You send me more information about Your error?

Could someone tell about using different parameters or point me to some website where i could study these?(now i got the defaults)
And when i open Shark reader i see many "RAW Packet" but i cant get any information from them, just "Packet #number".
.pcap files are fine when i open them with Wireshark.
At the bottom i see this: -NULL , what else i can use here and how it effects?
Interesting app, keep up the good work!

A changelog would be nice.

I also can not run Shark on my X10. I get the error 'reloc_library [1215]: cannot locate _aeabi_fdiv CANNOT LINK EXECUTABLE
Sent from my X10a using XDA App

acips said:
Could someone tell about using different parameters or point me to some website where i could study these?(now i got the defaults)
And when i open Shark reader i see many "RAW Packet" but i cant get any information from them, just "Packet #number".
.pcap files are fine when i open them with Wireshark.
At the bottom i see this: -NULL , what else i can use here and how it effects?
Interesting app, keep up the good work!
Click to expand...
Click to collapse
Hello!
For Shark for Root parameters look at some examples/manuals about tcpdump. F.e. http://www.cs.ucr.edu/~marios/ethereal-tcpdump.pdf
Shark reader marks packets as RAW if it does not recognize it (currently it means it's not tcp/udp packet).
For filters you can use any tag and any tag with - sign. Tags are those in first column. Traffic is tagged by content (signature) and port. Signatures and ports you may update with Shark Updater (included in Shark Reader), but I have too little time to manage all those resources. I'll make this system public for tags submission/port submission, so interested users will be able to add necessary tags.
So, if you want to see only non zero bytes packets with http content, you may use this setting:
Code:
[ ] all [o] none | http -NULL |
Filters are processed in order. So http shows all http packets and -NULL hides those with nulls. First option works as global filter (show all or show none).
Warning! Not all traffic is tagged, so if you miss something, it could mean some tags are incorrectly assigned or skipped.
Hope it helps.
mcampbellsmith said:
I also can not run Shark on my X10. I get the error 'reloc_library [1215]: cannot locate _aeabi_fdiv CANNOT LINK EXECUTABLE
Sent from my X10a using XDA App
Click to expand...
Click to collapse
Which OS version your X10a have? I saw that there are some problems with reloc_library in Android 1.5.

It's Android 1.6 only on the X10
Sent from my X10a using XDA App

i made an spanish thread on my android site, lets see how it works on milestone
thanks!!!!

Can some please explain in lamon terms what this does?

hy there =) can you make a capture filter to msn conversations ? it would be nice =)

I use an app similar called 3G Watchdog (it's free).
Let's you know how much data you've used with a widget too!

slow4g63 said:
I use an app similar called 3G Watchdog (it's free).
Let's you know how much data you've used with a widget too!
Click to expand...
Click to collapse
LOL this is nothing like that my friend.. nothing at all

ex87,
Awesome work bro, life got too busy for me to work more on AndroShark, I really didn't drop it on purpose. But with a busy life, and me still really new at java, it was just too much. I am really glad you picked up the idea and ran with it.
Do you have any plans to opensource it at all (no worries if you dont)? I would like to be a contributor if you do decide to open source it.
I really doubt this is of any use. It was the second java app I ever worked on, and was really just a front end. Below is androshark source code. Like I said, this was my second attempt at writing an app, so please don't laugh If I were to do it today, I would completely change how it worked. /res/raw/sharktap was just tcpdump.
Code:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
/**
* ToDo:
* Check for root
* Check for first run
* Install Binaries on first run
* Check for sdcard mount
* Display file stats
* Name pcap based on file name
* Insert License
* kill sharktap on die
*
* @author jcase
*
*/
public class androshark extends Activity implements /*RadioGroup.OnCheckedChangeListener,*/ Button.OnClickListener {
Button btnStart, btnStop;
RadioButton radAll, rad3g, radWifi; //http://java.dzone.com/articles/google-android-tutorial?page=0,4
RadioGroup grpRadio;
TextView txtStatus, txtFilename, txtFilesize;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnStart = (Button)this.findViewById(R.id.btnStart);
btnStart.setOnClickListener(this);
btnStop = (Button)this.findViewById(R.id.btnStop);
btnStop.setOnClickListener(this);
long epoch = System.currentTimeMillis()/1000;
boolean exists = (new File("/data/data/net.andirc.androshark/files/sharktap")).exists();
if (exists) {
} else {
Process myproc = null;
try
{
try{
String strDirectoy ="/data/data/net.andirc.androshark/files";
new File(strDirectoy).mkdir();
}
finally {}
InputStream ins = getResources().openRawResource(R.raw.sharktap);
int size = ins.available();
byte[] buffer = new byte[size];
ins.read(buffer);
ins.close();
FileOutputStream fos = new FileOutputStream("/data/data/net.andirc.androshark/files/sharktap");
fos.write(buffer);
fos.close();
}
catch (Exception ex)
{
Log.e("yourTag", "Oops something happened: " + ex.getMessage(), ex);
}
finally {}
}
boolean exists2 = (new File("/sdcard/androshark/")).exists();
if (exists2) {
} else {
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED)) {
Process myproc = null;
try
{
myproc = Runtime.getRuntime().exec(new String[] {"su", "-c","chmod 755 /data/data/net.andirc.androshark/files/sharktap && mkdir /sdcard/androshark/"});
new AlertDialog.Builder(this)
.setMessage("This is a beta trial version of androshark and will expire on May 15th 2010. This app can potentially consume a lot of sdcard space, depending on how long you allow it to sniff traffic and how much bandwidth you are using.")
.setPositiveButton("OK", null)
.show();
}
catch (Exception ex)
{
Log.e("yourTag", "Oops something happened: " + ex.getMessage(), ex);
}
finally {}
} else {
new AlertDialog.Builder(this)
.setMessage("Error sd01: sdCard not found!")
.setPositiveButton("OK", null)
.show();
}
}
if (epoch >= 1273990849) { // May 15th 2010 1273990849
System.exit(0);
}
}
public void onClick(View v) {
Process myproc = null;
try
{
if (v == btnStart) {
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED)) {
myproc = Runtime.getRuntime().exec(new String[] {"su", "-c", "kill $(ps | grep sharktap | tr -s ' ' | cut -d ' ' -f2) && /data/data/net.andirc.androshark/files/sharktap -vv -s 0 -w /sdcard/androshark/dump.pcap"});
TextView txtStatus =
(TextView) this.findViewById(R.id.txtStatus);
txtStatus.setText("Status: Running");
TextView txtFilename =
(TextView) this.findViewById(R.id.txtFilename);
txtFilename.setText("Filename: /sdcard/androshark/dump.pcap");
/* int running = 1;
do {
File file = new File("/sdcard/androshark/dump.pcap");
long length = file.length();
TextView txtFilesize =
(TextView) this.findViewById(R.id.txtFilesize);
txtFilesize.setText("File Size: " + length/1024 + "KB");
} while (running <= 1); */
} else {
new AlertDialog.Builder(this)
.setMessage("Error sd02: sdCard not found!")
.setPositiveButton("OK", null)
.show();
}
} else if (v == btnStop) {
myproc = Runtime.getRuntime().exec(new String[] {"su", "-c", "kill $(ps | grep sharktap | tr -s ' ' | cut -d ' ' -f2)"});
myproc.waitFor();
File file = new File("/sdcard/androshark/dump.pcap");
long length = file.length();
TextView txtStatus =
(TextView) this.findViewById(R.id.txtStatus);
txtStatus.setText("Status: Stopped");
TextView txtFilesize =
(TextView) this.findViewById(R.id.txtFilesize);
txtFilesize.setText("File Size: " + length/1024 + "KB");
}
}
catch (Exception ex)
{
Log.e("yourTag", "Oops something happened: " + ex.getMessage(), ex);
}
finally {}
}
}

racemepls said:
Can some please explain in lamon terms what this does?
Click to expand...
Click to collapse
shdwknt said:
LOL this is nothing like that my friend.. nothing at all
Click to expand...
Click to collapse
Apparently you know, and still haven't helped those of us who have no idea what this app is for!

Random letter generator (Right selection?)

Hey guys, is there an app that can generate a random LETTER? I don't know if this is the right selection but... here is an example for what I'm looking for
# i can't post links... on google, search for "random letter generator" and click the first link
Thx.
Sent from my Desire HD using Tapatalk

not availaible at this moment bro! sorry!

Someone else that has an idea?
Sent from my Desire HD using Tapatalk

It's not difficult in C# under Windows Mobile .NET as the image below can testify, but it is no good on your Desire HD.
I'm a WinMo developer, not Android, but if anyone wants to port this code into Java under Android, here's the code to do it. Shouldn't be too difficult.
Code:
using System;
using System.Windows.Forms;
namespace RndLetters
{
public partial class Form1 : Form
{
string tmp = new string(' ', 50);
Random rnd = new Random();
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
int i, j;
listBox1.Items.Clear();
if (textBox1.Text.Length > 0)
{
for (j = 0; j < numericUpDown2.Value; j++)
{
tmp = "";
for (i = 0; i < numericUpDown1.Value; i++)
tmp+=textBox1.Text[rnd.Next(textBox1.Text.Length)];
listBox1.Items.Add(tmp);
}
}
}
}
}
P.S. RndLetters.exe is included in the zip file. It is compiled for .NET CF 2.0, but should run on all later versions.

Awesome!
# lol it's possible to create a random NUMBER generator but it isn't possible to make a random LETTER generator. Lol what is the diffrence?
Sent from my Desire HD using Tapatalk

The above code just picks a random character from the given string and adds it to the current one until it reaches the required length. It could not give a damn what is in the string.
Give it the digits 0-9 and it will churn out random numbers :-

I do know how to program a generator in visual basic, but i have no clue how to translate it to android or whatever the program language is called
Sent from my Desire HD using Tapatalk

xOMG said:
Awesome!
# lol it's possible to create a random NUMBER generator but it isn't possible to make a random LETTER generator. Lol what is the diffrence?
Sent from my Desire HD using Tapatalk
Click to expand...
Click to collapse
Simply assign each number a letter. Same difference.

Android uses Java which is not a million miles from C#, although there are some subtle differences.
This is the Java code for a console application that takes length, repeat and string as command line arguments, in that order. Note that there is zero error handling; get the parameters wrong and it will just throw an exception.
Code:
import java.util.Random;
public class Test
{
public static void main(String []args)
{
int i,j;
Random rnd = new Random();
for(j=0;j<Integer.parseInt(args[1]);j++)
{
for(i=0;i<Integer.parseInt(args[0]);i++)
{
System.out.print(args[2].charAt(rnd.nextInt(args[2].length())));
}
System.out.println();
}
}
}
As per the following:
Code:
C:\PROGRA~1\Java\JDK16~1.0_2\bin>java Test 20 5 abcdefghijklmnopqrstuvwxyz
zfwnnkheqmeyzkcvrdhj
ybuejlavzixstmmqxkxp
aylyjxheonkxhxjtayxg
iefcxuurhvgclpsgisvb
dfncfxueajbvhscderhr
Somehow you will have to fit some code similar to the above into a "Hello World" Android java program, and wire it up to Android textboxes, buttons, labels, etc. and their associated events. This is where my Android development knowledge ends, (at present), so it is over to the Android Development gurus.

[Q] WP7 facebook application, posting blank status updates only

Hi ive written a simple application for windows phone 7 that posts a status update to the users wall. This is all working correctly except for the fact that when the status update is done it is always empty. I am trying to make it so that the user can enter what they would like to say in a text box, but obviously so far this isnt working and all that is being sent is an empty status update. I am connecting to the facebook api and the authentication all works correctly or the post would not be sent at all. Ive searched all over the web and havent found anyone with the same issue as of yet.
Here is the status update code that I am working on:
Code:
private void PostStatusUpdate(string status, Action<bool, Exception> callback)
{
var request = HttpWebRequest.Create("https://graph.facebook.com/me/feed");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.BeginGetRequestStream((reqResult) =>
{
using (var strm = request.EndGetRequestStream(reqResult))
using (var writer = new StreamWriter(strm))
{
writer.Write("access_token=" + _accessToken);
writer.Write("&message=" + HttpUtility.UrlEncode(status));
}
request.BeginGetResponse((result) =>
{
try
{
var response = request.EndGetResponse(result);
using (var rstrm = response.GetResponseStream())
{
var serializer = new DataContractJsonSerializer(typeof(FacebookPostResponse));
var postResponse = serializer.ReadObject(rstrm) as FacebookPostResponse;
callback(true, null);
}
}
catch (Exception ex)
{
callback(false, ex);
}
}, null);
}, null);
}
[DataContract]
public class FacebookPostResponse
{
[DataMember(Name = "id")]
public string Id
{
get;
set;
}
}
private void PostUpdate_Click(object sender, RoutedEventArgs e)
{
PostStatusUpdate(this.StatusText.Text, (success, ex) =>
{
this.Dispatcher.BeginInvoke(() =>
{
if (success && ex == null)
{
MessageBox.Show("Status updated");
NavigationService.Navigate(new Uri("/Views/MainPage.xaml", UriKind.Relative));
}
else
{
MessageBox.Show("Unable to update status");
}
});
});
}
Has anyone encountered this before / know any solution to this problem?
Any insights into this would be much appreciated

You are using the asyncronous method with no callback function
Looks like you should be using a callback function - See examples here
http://msdn.microsoft.com/en-us/lib...est.begingetrequeststream(v=vs.90).aspx#Y1760
http://msdn.microsoft.com/en-us/lib...brequest.begingetrequeststream(v=vs.100).aspx
Also, did the same code work at one point?
It could be as simple as not closing your connections. I ran into this in the Weather City Editor that I wrote for Windows Mobile.
When I added code to hit accuweathers site to look up the code, I had forgotten to close the connection. I would need to wait until the connection timed out before it would work again.
I think yours is differnt though, since it is updating blank.
But, you could just use GetRequestStream, which does not need the callback function, synce it is not asyncronous. See example code: http://msdn.microsoft.com/en-us/library/d4cek6cc.aspx

Thanks for the reply
Thanks for the reply, the code has never worked so far it has only posted blank facebook statuses, I will see if adding an asynchronous call back makes a difference.
Thanks

How to Read PDF file Without save on Local storage windows phone 8 C#

I need to open pdf file without store on local storage. i tried this code but i am facing some issues when i am try to read pdf file through PDF Reader, Adobe Reader, etc. after click back navigation i deleted current file from local folder. But after closed my application and I am directly open PDF Reader, Adobe Reader... etc. File is exist(still have on my library). I could not delete the file. Please let me know is possible on windows phone 8 C#.
please see my code below.
Code:
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
try
{
using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
{
using (var fileStream = store.OpenFile("your-file.pdf", FileMode.Truncate, FileAccess.ReadWrite, FileShare.ReadWrite))
{
fileStream.Flush();
fileStream.Close();
if (store.FileExists("your-file.pdf"))
{
store.DeleteFile("your-file.pdf");
}
StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
await local.DeleteAsync(StorageDeleteOption.PermanentDelete);
}
}
}
catch
{
//File does not exist.
}
}
private async void Button_Click(object sender, RoutedEventArgs e)
{
//RestSharp from Nuget
var client = new RestClient("https://dvtp17lb47b1q.cloudfront.net");
var request = new RestRequest("/magazine/file/PDF-2.pdf?c34tP5IxEK=2b26c756615a40844a6564d13a3eb875", Method.GET);
var response = await client.ExecuteTaskAsync(request);
byte[] buffer = response.RawBytes;
using (IsolatedStorageFile storageFile = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream stream = storageFile.OpenFile("your-file.pdf", FileMode.Create))
{
await stream.WriteAsync(buffer, 0, buffer.Length);
}
}
StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
StorageFile pdffile = await local.GetFileAsync("your-file.pdf");
// Launch the pdf file.
Windows.System.Launcher.LaunchFileAsync(pdffile);
}
Main Functionality is only read the pdf file without saving.