Database Users

Why the basic OPENGL ES app can not run on my Touch HD?

Hi, all.
I find this perfect site through Google after I bought a Blackstone.
I want to do something on my phone, that's OpenGL ES.
When I download the sample code "7 OpenGL ES Tutorials for Win32/WinCE from TyphoonLabs" from khronos and compile them. The samples run well on the Windows Mobile 6.5 Emulator. (there is no libGLES_cm.dll file in the windows folder)
But, when I copy the exe files to my Blackstone, they failed to run. The Tutorials 1 only flash a title then over.
I can find a libGLES_cm.dll file in the windows folder of my Blackstone. It is 322KB, smaller than others I can get. (such as 491KB 10-10-2004). I can't replace it or delete it.
I think the 1st sample of TyphoonLabs is a typical and basic OpenGL ES app, it has not use any advanced ES feature.
however, VR HOLOGRAM runs well on my phone.
I installed "Ati d3d driver", and my app development environment is:
Visual Studio 2008
Windows Mobile 6 SDK
thanks

Have a look at the first post of my OpenGLES test app(check my sig) and try to run this app (take the latest one). There is also a link to a thread about a driverpack (v3 has just been released). Just to be sure that your device has some OpenGLES capable drivers.
AFAIK the hologram app uses d3d.
edit: The examples you mentioned create a rendering device using Red 8, Green 8, Blue 8 bits. Change them to 5, 6, 5 and try again. And don't copy their libgles_cm.dll to the device. Instead use the latest driverpack as described above.

Thank you, heliosdev
yes, i already tried your OpenGLES test app. it runs well also on my phone, but I don't understand C. do you have C code?
i try to modify the sample code following you instruction. but i failed. where am i wrong?
BOOL InitOGLES()
{
EGLConfig configs[10];
EGLint matchingConfigs;
const EGLint configAttribs[] =
{
EGL_RED_SIZE, 5, // i changed it from 8 to 5
EGL_GREEN_SIZE, 6, // i changed it from 8 to 6
EGL_BLUE_SIZE, 5, // i changed it from 8 to 5
EGL_ALPHA_SIZE, EGL_DONT_CARE,
EGL_DEPTH_SIZE, 16,
EGL_STENCIL_SIZE, EGL_DONT_CARE,
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_NONE, EGL_NONE
};
hDC = GetWindowDC(hWnd);
glesDisplay = eglGetDisplay((NativeDisplayType)hDC);
if(!eglInitialize(glesDisplay, NULL, NULL))
return FALSE;
if(!eglChooseConfig(glesDisplay, configAttribs, &configs[0], 10, &matchingConfigs))
return FALSE;
if (matchingConfigs < 1) return FALSE;
glesSurface = eglCreateWindowSurface(glesDisplay, configs[0], hWnd, configAttribs);
if(!glesSurface) return FALSE;
glesContext=eglCreateContext(glesDisplay,configs[0],0,configAttribs);
if(!glesContext) return FALSE;
eglMakeCurrent(glesDisplay, glesSurface, glesSurface, glesContext);
glClearColorx(0, 0, 0, 0);
glShadeModel(GL_SMOOTH);
RECT r;
GetWindowRect(hWnd, &r);
glViewport(r.left, r.top, r.right - r.left, r.bottom - r.top);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrthox(FixedFromInt(-50), FixedFromInt(50),
FixedFromInt(-50), FixedFromInt(50),
FixedFromInt(-50), FixedFromInt(50));
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
return TRUE;
}
//----------------------------------------------------------------------------
void Render()
{
static int rotation = 0;
GLshort vertexArray[9] = {-25,-25,0, 25,-25,0, 0,25,0 };
GLubyte colorArray[12] = {255,0,0,0, 0,255,0,0, 0,0,255,0};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatex(0, 0, FixedFromInt(-10));
glRotatex(FixedFromInt(rotation++), 0, ONE,0);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_SHORT, 0, vertexArray);
glEnableClientState(GL_COLOR_ARRAY);
glColorPointer(4,GL_UNSIGNED_BYTE, 0, colorArray);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
eglSwapBuffers(glesDisplay, glesSurface);
}

On your device there is no libgles_cm.dll at the place where your exe is, right?
Otherwise remove it from the directory where your exe is.
edit:
If it still doesn't start you could try to write out some messages during initialization (at the places before returning false).
Do you have libgles_cl.dll? In the code you have thes FixedFrom* calls.
You could try to remove all these calls, i.e. instead of FixedFromInt(i) just i and you'll have to change the x to i,f or d in the calls like Rotatex.

heliosdev said:
On your device there is no libgles_cm.dll at the place where your exe is, right?
Otherwise remove it from the directory where your exe is.
Click to expand...
Click to collapse
I copied the libgles_cm.dll file before from windows folder to Storage Card, where the exe file locates.
now I delete the libgles_cm.dll file , but nothing changes.

heliosdev said:
On your device there is no libgles_cm.dll at the place where your exe is, right?
Otherwise remove it from the directory where your exe is.
edit:
If it still doesn't start you could try to write out some messages during initialization (at the places before returning false).
Do you have libgles_cl.dll? In the code you have thes FixedFrom* calls.
You could try to remove all these calls, i.e. instead of FixedFromInt(i) just i and you'll have to change the x to i,f or d in the calls like Rotatex.
Click to expand...
Click to collapse
thank you again.
I find the error occurs during initialization,
BOOL InitOGLES()
{
EGLConfig configs[10];
EGLint matchingConfigs;
const EGLint configAttribs[] =
{
EGL_RED_SIZE, 5, // i changed it from 8 to 5
EGL_GREEN_SIZE, 6, // i changed it from 8 to 6
EGL_BLUE_SIZE, 5, // i changed it from 8 to 5
EGL_ALPHA_SIZE, EGL_DONT_CARE,
EGL_DEPTH_SIZE, 16,
EGL_STENCIL_SIZE, EGL_DONT_CARE,
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_NONE, EGL_NONE
};
hDC = GetWindowDC(hWnd);
glesDisplay = eglGetDisplay((NativeDisplayType)hDC);
if(!eglInitialize(glesDisplay, NULL, NULL))
return FALSE;
if(!eglChooseConfig(glesDisplay, configAttribs, &configs[0], 10, &matchingConfigs))
return FALSE;
if (matchingConfigs < 1) return FALSE;
glesSurface = eglCreateWindowSurface(glesDisplay, configs[0], hWnd, configAttribs);
if(!glesSurface) return FALSE;
Here, it returns

Hy,
maybe this can be a workaround for you!
http://cegcc.sourceforge.net/docs/faq.html#DllDoesNotWorkWithWindowsMobile6.1
------------------
Memory management changes in Windows Mobile 6.1 cause some DLLs not to load. It has been suggested (see this blog that the underlying problem is a writable code section in the DLL, other reports suggest that the DLL size may be an issue.
The workaround or solution (I'm not sure what to call it) that we have is to restrict this DLL to Slot 0 by adding the following registry key:
[HKEY_LOCAL_MACHINE\System\Loader\LoadModuleLow] "MyDll.dll"=dword:1
Obviously you need to change "MyDll" into the name of the DLL that causes the problem.
Please note that using the this approach will force your entire DLL into Slot 0 and, it may prevent other modules from loading in that slot. Therefore, the above registry setting should be used with caution.
------------------
Greatz
mccoffein

mccoffein said:
Hy,
maybe this can be a workaround for you!
http://cegcc.sourceforge.net/docs/faq.html#DllDoesNotWorkWithWindowsMobile6.1
------------------
Memory management changes in Windows Mobile 6.1 cause some DLLs not to load. It has been suggested (see this blog that the underlying problem is a writable code section in the DLL, other reports suggest that the DLL size may be an issue.
The workaround or solution (I'm not sure what to call it) that we have is to restrict this DLL to Slot 0 by adding the following registry key:
[HKEY_LOCAL_MACHINE\System\Loader\LoadModuleLow] "MyDll.dll"=dword:1
Obviously you need to change "MyDll" into the name of the DLL that causes the problem.
Please note that using the this approach will force your entire DLL into Slot 0 and, it may prevent other modules from loading in that slot. Therefore, the above registry setting should be used with caution.
------------------
Greatz
mccoffein
Click to expand...
Click to collapse
thank you, mccoffein. that is a different idea.
But i think registry table is not the issue. Because the app can run on WM6.5 emulator, and heliosdev's OPENGL ES test app can run on my phone also.
I download glBenchmark 1.0 from glbenchmark.com, it can run also.
now I have no idea.

anyone can help me?

Got it
When I put my libgles_cm.dll in the same folder of my App, the App runs.
I think the libgles_cm.dll from HTC has some unknown problems.
Thanks

ak2009 said:
thank you again.
I find the error occurs during initialization,
BOOL InitOGLES()
{
EGLConfig configs[10];
EGLint matchingConfigs;
const EGLint configAttribs[] =
{
EGL_RED_SIZE, 5, // i changed it from 8 to 5
EGL_GREEN_SIZE, 6, // i changed it from 8 to 6
EGL_BLUE_SIZE, 5, // i changed it from 8 to 5
EGL_ALPHA_SIZE, EGL_DONT_CARE,
EGL_DEPTH_SIZE, 16,
EGL_STENCIL_SIZE, EGL_DONT_CARE,
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_NONE, EGL_NONE
};
hDC = GetWindowDC(hWnd);
glesDisplay = eglGetDisplay((NativeDisplayType)hDC);
if(!eglInitialize(glesDisplay, NULL, NULL))
return FALSE;
if(!eglChooseConfig(glesDisplay, configAttribs, &configs[0], 10, &matchingConfigs))
return FALSE;
if (matchingConfigs < 1) return FALSE;
glesSurface = eglCreateWindowSurface(glesDisplay, configs[0], hWnd, configAttribs);
if(!glesSurface) return FALSE;
Here, it returns
Click to expand...
Click to collapse
Yes. Because hWnd now is not valid handle. Hands of tutorial programmers is from ass .
Simple, call InitOGLES() after you created window.

XML-RPC on Android

Hi,
I need help by using XML-RPC on Android. The Software I want to write needs to get Informations via XML-RPC from a Server. I have no expirience by Using XML-RPC and so I dont no wants the best way to do what I want.
Does someone have a good tutorial for that or give me some tips?
I tried do do it like that, but always getting an unknownHostException
PHP:
String testString;
try {
uri = URI.create("htt://julre.servebeer.com:7227");
client = new XMLRPCClient(uri);
testString = (String)client.call("free_space");
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
}
The "p" by http I had to delete, because I cant post outsite URLs yet...
EDIT:
Ok the first problem I solved. I have forget to set the persmission for the internet access^^
Now i become the HTTP Status 401 != 200....

2G/3G Preferred Network Mode with root?

I'm trying to access the hidden API for Phone.class to switch the preferred network mode via reflection.
I know this is not safe for porting to other android versions/roms and requires a system app to hold permission WRITE_SECURE_SETTINGS.
I Already managed to switch data via reflection and toggle gps via Settings.Secure.putString() by moving my app to system partition, so i think this should work too.
Does anyone have experience with reflection and/or root and is willing to help?
Of course I will share all my code/findings here.
Thanks in advance!
Links:
http://stackoverflow.com/questions/8607263/android-4-0-4g-toggle
http://stackoverflow.com/questions/5436251/how-to-access-setpreferrednetworktype-in-android-source

You can achieve this with a simple sqlite3 query instead of bothering with java reflection
Here's how :
In a terminal :
To enable 2G only
Code:
su
sqlite3 /data/data/com.android.providers.settings/databases/settings.db
insert into global values(null, 'preferred_network_mode', 1);
.exit
To enable 2G & 3G :
Code:
su
sqlite3 /data/data/com.android.providers.settings/databases/settings.db
insert into global values(null, 'preferred_network_mode', 0);
.exit
In java :
Example to enable 2G only (just replace the 1 with a 0 in the insert into to enable 2G & 3G)
Code:
try {
Process process = null;
process = Runtime.getRuntime().exec("su");
DataOutputStream os = new DataOutputStream(
process.getOutputStream());
os.writeBytes("sqlite3 /data/data/com.android.providers.settings/databases/settings.db" + "\n");
os.writeBytes("insert into global values(null, 'preferred_network_mode', 1);" + "\n");
os.writeBytes(".exit" + "\n");
os.writeBytes("exit\n");
os.flush();
process.waitFor();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
It might require a reboot to be active though, not sure
If it doesn't work on your rom (tested on cm10.1), it might be a different row name, try investigating your settings.db like this :
Code:
sqlite3 /data/data/com.android.providers.settings/databases/settings.db
.tables [COLOR="Green"]// returns all the tables[/COLOR]
select * from [I]tablename[/I]; [COLOR="green"]// in cm10.1 it's in [I]global[/I] but otherwise look in [I]secure[/I] and/or [I]system[/I]
// this command returns all the rows from the selected table, the names are usually explicit, so you should find the setting you're looking for[/COLOR]
Then, when you found it :
Code:
insert into [I]tablename[/I] values(null, [I]'row name'[/I], value);

Thanks, this is very helpful!
I think you are right, one will need to tell the system to update the settings or send a broadcast that this setting has changed (like for airplane mode).
I will look at the CM sources to find out what i can do.

superkoal said:
Thanks, this is very helpful!
I think you are right, one will need to tell the system to update the settings or send a broadcast that this setting has changed (like for airplane mode).
I will look at the CM sources to find out what i can do.
Click to expand...
Click to collapse
Glad it helped.
If you manage to find a way to make the settings read the db without a reboot, please share your findings, would be very useful.

Androguide.fr said:
Glad it helped.
If you manage to find a way to make the settings read the db without a reboot, please share your findings, would be very useful.
Click to expand...
Click to collapse
Of course i will!

Buddy... you can toggle network mode with intent, no root needed, nor permissions!!
Here´s entire sample:
Code:
package com.serajr.togglenetworkmode;
import android.os.Bundle;
import android.provider.Settings.Secure;
import android.provider.Settings.SettingNotFoundException;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bnt = (Button) findViewById(R.id.button1);
bnt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// toggle
toggleNetworkMode();
}
});
}
private void toggleNetworkMode() {
int mode = getCurrentNetworkMode() + 1;
if (mode > 2) {
mode = 0;
}
// 0 = 3G_ONLY
// 1 = 3GSM_ONLY
// 2 = 3G_PREFERRED
// change mode
Intent intent = new Intent("com.android.phone.CHANGE_NETWORK_MODE");
intent.putExtra("com.android.phone.NEW_NETWORK_MODE", mode);
sendBroadcast(intent);
}
private int getCurrentNetworkMode() {
try {
int current = Secure.getInt(getContentResolver(), "preferred_network_mode");
return current;
} catch (SettingNotFoundException ex) {
return 0;
}
}
}
Try it and tell me later!!!

Thanks, but this will only work if your phone.apk has an exported receiver for this intent.
This is only the case if you or your rom dev modded it to be so.
Some custom ROMs also have this kind of "mod/bug" in the power widget, allowing you to toggle gps.
I tried it with slim bean 4.2 build 3 on i9000 and as expected it didn't work (and so will most likely in CM10.1 too).
Just too good to be true!

If youre following the root method Use RootTools for that

sak-venom1997 said:
If youre following the root method Use RootTools for that
Click to expand...
Click to collapse
Thanks, I already do.
Really helpful library!
And yes, I will do it by sql injection to settings.db
I only need to figure out what broadcasts have to be sent / methods called and if this is possible.

Argh I am kinda lost in CM sources.
Can anyone point me to the place where this is handled?
I managed to toggle flight mode by using this in a SU shell:
Code:
if(settingenabled)
{
executeCommand("settings put global airplane_mode_on 1");
executeCommand("am broadcast -a android.intent.action.AIRPLANE_MODE --ez state true");
}
else
{
executeCommand("settings put global airplane_mode_on 0");
executeCommand("am broadcast -a android.intent.action.AIRPLANE_MODE --ez state false");
}
Interstingly enough it didn't work if i manually injected the value and then sent the broadcast.
I have no idea why.
So atm I'm trying to do the same thing for preferred_network_mode. I can write the value to settings.db, but I just don't know what i have to do to make the system apply the setting yet.
EDIT: shell binary "settings" only works in android 4.2 (and probably upwards)

So i finally found it in CM Sources.
Seems like we need to get the currently running Instance of the Phone class to notify it about the change.
Also seems like we are back to reflection, as this is an internal system class.
I also killed com.android.phone process after updating the setting, but that didn't change anything.
EDIT:
1st step towards reflection:
I figured out that i need a jar file from the cm build to use system classes via reflection.
Does anyone have more information about this?

superkoal said:
So i finally found it in CM Sources.
Seems like we need to get the currently running Instance of the Phone class to notify it about the change.
Also seems like we are back to reflection, as this is an internal system class.
I also killed com.android.phone process after updating the setting, but that didn't change anything.
EDIT:
1st step towards reflection:
I figured out that i need a jar file from the cm build to use system classes via reflection.
Does anyone have more information about this?
Click to expand...
Click to collapse
Just a far fetched guess, but maybe try to add /system/framework/framework.jar from your rom to your app's build path
Is a reboot that unacceptable in your case ?

Maybe it's just the challenge, but i wanna change it like every other setting
A reboot is very far from what i call comfortable

superkoal said:
Maybe it's just the challenge, but i wanna change it like every other setting
A reboot is very far from what i call comfortable
Click to expand...
Click to collapse
Yeah, I get what you mean^^^
Here's a good (but old, 2009^^) official Android tutorial from the Android devs on reflection if it can help you : http://android-developers.blogspot.fr/2009/04/backward-compatibility-for-android.html

So i got some news
1. This setting is heavily protected by android system and can only be modified by the phone process itself
2. Some roms have a modified phone apk listening to a broadcast, enabling 3rd party apps to toggle
http://forum.xda-developers.com/showthread.php?t=1731187
3. His Majesty Chainfire started an app project which could amongst other features also toggle 2g/3g, but he gave up development. Regarding 2g/3g he implemented several methods, one of them being RIL injection, which he described as a really hard hack and highly experimental.
http://forum.xda-developers.com/showthread.php?t=807989
Seems this task is not that easy
But i found out that tasker can toggle 2g/3g on my phone (running slim bean 4.2.2), this is when i found out about the modified phone.apk from 2). So I'mcomfortable that it's working on my phone and i can at least develop an app for myself
Sent from my GT-I9000 using xda app-developers app

How to search StorageFiles

I need a way to search in StorageFiles with dynamically pattern, which comes from a TextBox. The directive "Windows.Storage.Search" doesnt exist in windows phone 8.1 runtime, as i saw. Now my question is, how can i do this in alternative way?

The only way to do it with WP 8.1 since Microsoft ALWAYS fails to implement the important things are to query using LINQ.
Ex:
Code:
var result = (await Windows.Storage.ApplicationData.Current.LocalFolder.GetFilesAsync(Windows.Storage.Search.CommonFileQuery.OrderByName)).
Where(x => x.Name.
Contains(x => txtBox.Text));
That's about all you can do pretty much. (Thanks Microsoft).

Thank you for the example. But it wont work for me, it shows me the following error(s):
Code:
A local variable named 'x' cannot be declared in this scope because it would give a different meaning to 'x', which is already used in a 'parent or current' scope to denote something else
and
Code:
Cannot convert lambda expression to type 'string' because it is not a delegate type
Thats really odd from Microsoft, that they havent implementet the search function like in WinRT (Windows Store App).

The first error is pretty simple. You already have the variable named "x" and it would be very bad if compiler didn't give you that error.
Change the name of the variable to something else that you don't use in that scope and it will work.
And for second problem, try this one:
Code:
private List<string> Result()
{
var result = ((List<Windows.Storage.Search.CommonFileQuery>)Windows.Storage.ApplicationData.Current.LocalFolder.GetFilesAsync(Windows.Storage.Search.CommonFileQuery.OrderByName)).Where(x => x.ToString().Contains(txtBox.Text));
return result as List<string>;
}
private async Task<List<string>> ResultAsync()
{
return await Task.Run(() => Result()).ConfigureAwait(continueOnCapturedContext: false);
}
You should call ResultAsync method and get the result in this way:
Code:
List<string> myList = ResultAsync().Result;

That's not going to work. You can't cast a StorageFile as a string.
To fix my code (simple lambda typo)
Code:
var result = (await Windows.Storage.ApplicationData.Current.LocalFolder.GetFilesAsync(Windows.Storage.Search.CommonFileQuery.OrderByName)).
Where(x => x.Name.
Contains(txtBox.Text));
if(result.Any())
{
// Do shtuff
}
Also, you should never access the .Result of an async task because you never know if it completed yet.

Ok, first error is done, but the second error is still here
Code:
Cannot convert lambda expression to type 'string' because it is not a delegate type

You are missing the point of the TAP (Task Async Pattern).
Both main thread and async method will be in execution in the same time. When the async method finish his work, main thread will stop and catch the result trough the Result property.
TAP is the recommended way of asynchronous programming in C#. The only thing with TAP is to use ConfigureAwait method in non-console type of apps to avoid deadlock.
Sooner or later you will get the result from TAP method. Nothing will get in the conflict with the main thread.

Oh wait, @andy123456 I updated my response. I forgot String.Contains ISNT a lambda .
@Tonchi91, I know all about the TAP. I've been using it since it was CTP. I've seen the awkward situations with threading in WP .

Now... if he did
Code:
List<string> myList;
ResultAsync().ContinueWith(t=> { myList = t.Result; });
I wouldn't be worried .

Ok the errors are gone, but the debugger show me the following exception:
Code:
Value does not fall within the expected range
Is this search method case-sensitive? I tried with an exact input in the TextBox.

Hmmm. Let's see your full code.

its actually only for testing, so i added your code to a button (asnyc) and will show the output in a textBlock.
Code:
private async void buttonTest_Click(object sender, RoutedEventArgs e)
{
//Result();
var result = (await Windows.Storage.KnownFolders.CameraRoll.GetFilesAsync(Windows.Storage.Search.CommonFileQuery.OrderByName)).
Where(x => x.Name.
Contains(textBox_test.Text));
if (result.Any())
{
// Do shtuff
textBlock_test.Text = result.ToString();
}
}
The error is coming from here
Code:
var result = (await Windows.Storage.KnownFolders.CameraRoll.GetFilesAsync(Windows.Storage.Search.CommonFileQuery.OrderByName))

andy123456 said:
its actually only for testing, so i added your code to a button (asnyc) and will show the output in a textBlock.
Code:
private async void buttonTest_Click(object sender, RoutedEventArgs e)
{
//Result();
var result = (await Windows.Storage.KnownFolders.CameraRoll.GetFilesAsync(Windows.Storage.Search.CommonFileQuery.OrderByName)).
Where(x => x.Name.
Contains(textBox_test.Text));
if (result.Any())
{
// Do shtuff
textBlock_test.Text = result.ToString();
}
}
The error is coming from here
Code:
var result = (await Windows.Storage.KnownFolders.CameraRoll.GetFilesAsync(Windows.Storage.Search.CommonFileQuery.OrderByName))
Click to expand...
Click to collapse
Oh Camera Roll.. You MIGHT need to have the capability to view the camera roll enabled. I forget what it's called, but you need a specific cap in order to view from there. Also, I would try to see if you can use a generic folder instead.
I would try Windows.Storage.ApplicationData.Current.LocalFolder.GetFilesAsync() as your method after the await just to test whether you can read correctly.

Yes but in wp8.1 runtime app, there arent caps anymore. The capability for access to the pictures is simply calles pictures library and is enabled. I have tested it as you said, but it gives me the same exception.

A quick tip: another way to do this is to use the Win32 C runtime API. You can, for example, use the FindFirst/NextFile functions (http://msdn.microsoft.com/en-us/library/windows/desktop/aa364418(v=vs.85).aspx) which support searches using wildcards (* and ? characters in the first parameter). These functions are wrapped in my NativeLibraries classes, but are also just publicly available for third0party developers to call from their own C++ DLLs.
Alternatively, you can use the .NET System.IO.Directory class, which has functions like EnumerateFiles(String path, String searchPattern). This is probably the better way to do it, actually.
Of course, if you want these operations to not block the current thread, you'll need to explicitly put them in their own thread or async function.
EDIT: This also assumes you have read access to the relevant directories. You application data directory works fine, for example (you can get its path from the relevant StorageFolder object). Other directories that can be accessed via WinRT functions may go through a broker function instead of being directly readable.

The point is, that i have an array with filenames. Now i need the StorageFile files which contains these filenames. My idea was to search for these files and return the files as StorageFile, so i can work with these. Or is there a simpler / another way?

http://msicc.net/?p=4182 <-- try this

Thank you, i have already done this and its working. But how can i compare the Files to read, with already read files and take only the not yet read files?

Beginner Developer Here Needing Help

I'm making a project in Android Studio that requires the user to give permissions. The only code that I've found online and in YouTube tutorials is the following code:
public void onClick(View v) {
Intent i = new Intent();
i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
i.setData(Uri.parse("package:" + getPackageName()));
i.addFlags(Intent.FLaG_ACTIVITY_NEW_TASK);
startActivity(i);
}
It works however, I would like a direct code that will open permissions directly for my app. Not just the details. I know it's one click over but I would still like a direct code that will popup that permissions area at users request. I appreciate the help that I can get with this.