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I don't know much about the nuts and bolts at this point, but PCM is the format that all those formats must become when played back before they can be sent out of the digital to analog converter (DAC), because that is the native format of a DAC. So a class that plays back any of those formats must send PCM to the audio interface driver. If you can intercept that transfer, you have PCM. the problem with wma or aac is that DRM formats, when the content is protected, must be read by an executable that can decrypt it. These executables contain a secret encryption key, are furnished with an API by the DRM format's sponsor (Microsoft and Apple, respectively), and will only send output to hardware drivers that are preauthorized by the sponsor. This is the whole basis of DRM.
If the content is in these formats and not DRM protected, you should be able to get around this, as many windows programs allow you to convert unprotected WMA and AAC to wav. Flac is open and doesn't have DRM issues.
Maybe you knew all this, but if you didn't, hopefully it helps get you started.
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Thanks for sharing information about audio format.....
But my actual interest is to know about implementation point of view of such decoding (flac,wma,aac,m4a to pcm(wav)) conversion in .net mobile application.
modified on Saturday, October 11, 2008 5:34 AM
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Hi everybody.
I am making a Mobile Web Application using .NET and C# and I use ValidationSummary control to control a TextBox.
The test work fine and on Explorer i can see that the ValidationSummary control works fine: the error message appair at the top of the screen and the link "BACK" is in the next line. But when i try in a Motorola U6 phone i see the error message and the link "BACK" together in the same line and the look and feel is not goog.
My question is: Is there some way to resolve this little problem ? I am new in Mobile Web Application and i have not experience in this field.
I will appreciate some suggestions.
Thanks
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Hi all!
Can someone help me on how to implement a licence key recognition to a mobile application developed using V.S. 2005, C.F. 2 and VB language?
I would desire to introduce a limitations on usage of the software without a purchased key registration, and switch it to full features after purchased key registration.
I also would like to know if there are other protection/registration way.
Thanks
Ignazio
modified on Thursday, September 25, 2008 1:41 PM
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USE MOBILE UNIQUE ID
Dushan Perera
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Thanks for guideline Dushan,
But it seems that to read/use Device UNIQUE ID, it's necessary to write C++ code, and I am only able to write VB code.
I also have some doubt that it's possible using Compact Framework.
Am I wrong?
Ignazio
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In C# it like this
//import InteropServices namespace
using System.Runtime.InteropServices;
//Import DLL
[DllImport("coredll.dll")]
private extern static int GetDeviceUniqueID([In, Out] byte[] appdata,
int cbApplictionData,
int dwDeviceIDVersion,
[In, Out] byte[] deviceIDOuput,
out uint pcbDeviceIDOutput);
public string getDeviceUniqueID()
{
byte[] buffer = GetDeviceID("MyAppString");
StringBuilder sb = new StringBuilder();
for (int x = 0; x < buffer.Length; x++)
{
sb.Append(string.Format("{0:x2}", buffer[x]));
}
string strUniqueID = sb.ToString();
return strUniqueID;
}
Dushan Perera
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Thanks Dushan,
I know that it's possible to introduce a C# or C++ routine in a VB-written application, but before I'll must learn how to do it.
Now I know what is UniqueID, but I not undestood yet in which way to read it can protect the software from unauthorized use.
The code can be modified depending on UniqueID of device?
modified on Monday, September 29, 2008 2:19 PM
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hi everyone
does anyone perhaps know how to implment text to speech on windows mobile devices such as the htc tytn II? i know how to do it on a normal windows desktop application but i have been searching on the net to find a sollution for the .net compact framework but no luck. the language that i code in is C#.
thanks in advance.
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Hello there.
Im trying to compile a program for a Casio DT-X10 device. I have installed the DT-X10 SDK, but every time I select it in embedded visual c++ 4.0, it (the program) collapses and stop working, so I have to close it and open it again.
Ive proved usind the standardSDK, but it dont compile (it says that I need to install the correct SDK ._.). The archive I installed was "DT-X10_SDK.msi". Is that the correct one, isnt it? Maybe I have it installed in the wrong folder? But its not that the program doesnt recognize the SDK, its that it blocks permanently when I select it (DT-X10).
Thanks a lot in advance 
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Hi friends,
I need to make a transparent control over Mobile screen.
Eg: Some video is displaying on mobile and my transparent control can be seen on that screen.
Could anybody tell me how to achieve that ??
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Hi, i'm developing a Pocket PC Application. I am working on security issues, so i was wondering if there is any way to modify the connection string: adding the ip of the server instead of the server name.
The application is working with this string:
String RDAOleBDConnectionString = "Provider=SQLOLEDB;Data Source=" + NombreServidor + "," + Puerto + ";Integrated Security=SSPI;Initial Catalog =" + NombreBD + ";";
to something like this:
Data Source=190.190.200.100,1433;Network Library=DBMSSOCN;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword;
i tried to use the last one but i got errors about the provider.
thanks for any help
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I am using:
Data Source=190.190.200.100,1433;Initial Catalog=myDatabase;User ID=myUsername;Password=myPassword;
Kind Regards.
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Hey Guys,
I have a working program that uses SetWindowsHook to capture low level keyboard messages of my pocket pc. This only captues the hardware buttons.
I want to hook the stylus tapping the screen.
How can this be done? Can it be done with SetWindowsHook?
Michael
mjmimmm@hotmail.com
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Hello All,
Currently I get whole mobile socrce code developeed for English. I want to make a sepeate image for a new language, apart from default supported 20 languages by Microsoft.
For our applications, I can get .rc file and add string table for new language and I am able to display the applications in local language what I need.
But for OS applications, menus and error messages, I am not sure how to proceed. Can any one help me to give a artcile or book reference how to localize the whole mobile and not single application.
Thanks and Regards
Blr Boy.
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hi all...im creating a mobile application that needs to run constantly...is there a way to disable the sleep mode accross different versions of win mob., the earliest will be 2003, is there a way to achieve this?
thanks in advance.
living life on the flip side
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I know only this way: Your application would must send a keystroke every 30 seconds which makes the operating system think it is being used. This does not stop the screen from auto dimming - this must be set in the CE device System configuration.
I have actually installed an application provided of this feature.
I hope this help you.
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http://www.codeproject.com/KB/mobile/WiMoPower1.aspx
Search for "Don't let the device sleep."
In short you need to call SystemIdleTimerReset() every so often. the exact rate at which you need to call it will vary based on device settings. There is an example program in this article that will show you how to do it.
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Hi Iam trying with Assymetric Encryption with cryptAPI in CE 6.0... GetCryptoKey Iam passing public key and try to encrypt it.. but it gives error... can any body check the GetCryptoKey ()function and give me the suggesstions
static public byte[] Encrypt(string pulickey, byte[] data)
{
if (!WinApi.CryptAcquireContext(ref hProv, null, WinApi.MS_DEF_PROV,
WinApi.PROV_RSA_FULL, WinApi.CRYPT_VERIFYCONTEXT))
Failed("CryptAcquireContext");
// generate encryption key from passphrase
hKey = GetCryptoKey(hProv, pulickey);
// determine how large of a buffer is required
// to hold the encrypted data
uint dataLength = (uint)data.Length;
uint bufLength = (uint)data.Length;
if (!WinApi.CryptEncrypt(hKey, IntPtr.Zero, true,
0, null, ref dataLength, bufLength))
Failed("CryptEncrypt");
}
static private IntPtr GetCryptoKey(IntPtr hProv, string pulickey)
{
// crypto handles
IntPtr hHash = IntPtr.Zero;
IntPtr hKey = IntPtr.Zero;
try
{
// create 128 bit hash object
if (!WinApi.CryptCreateHash(hProv,
WinApi.CALG_MD5, IntPtr.Zero, 0, ref hHash))
Failed("CryptCreateHash");
// add passphrase to hash
byte[] keyData = ASCIIEncoding.ASCII.GetBytes(passphrase);
if (!WinApi.CryptHashData(hHash, keyData, (uint)keyData.Length, 0))
Failed("CryptHashData");
// Get a handle to the key exchange key.
if (!WinApi.CryptGetUserKey(hProv, 1, ref hProv))
{
uint dwResult = WinApi.GetLastError();
// printf("Error %x during CryptGetUserKey!\n", GetLastError());
//goto done;
}
if (!WinApi.CryptImportKey(hProv, keyData, (uint)keyData.Length, 0, 0, ref hProv))
{
uint dwResult = WinApi.GetLastError();
}
if (!WinApi.CryptGenKey(hProv, WinApi.CALG_RC2, WinApi.CRYPT_EXPORTABLE, ref hKey))
{
uint dwResult = WinApi.GetLastError();
//MessageBox("Error CryptGenKey() failed.", "Information", MB_OK);
// return;
}
// if (!WinApi.CryptGenKey(hProv, WinApi.CALG_RC2, WinApi.CRYPT_EXPORTABLE, ref hKey))
// {
// Failed("CryptGenKey");
// }
}
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Hi, i've been looking arround the forum for an answer. well i'm using the kacommon dll from Alex Kwok and i have a little problem. There are some FTP that i won't access no matter what. the problem seems to be when listing the directory content. but i'm not really sure. Has anyone used this component and had a similar problem?
Some Specs for reference:
i dooing an aplicaction for a PockePc with WM6.0, connected via GPRS and it works fine with most FTP servers, but some simple wont acept connection, i think it has something to do with the file sistem on the server, but when i cloned a non-working-with-my-app FTP site, to a Previously-Working-with-my-app FTP Site it didnt work ether, the funny thing is that the non-working-with-my-app site was a clone of the previously-working-with-my-app FTP site. and now none of them works, no funny filenames, or strange symbols nether.
Please help if you can.
Thanks
Black.
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hi, i want some code or tutorials specifying how to use bluetooth in mobile for serial communication.
i.e i dont want it use as obex, RFCOMM, L2cap only as com port cant it be if so how is to do..
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Programing Bluetooth for serial communication is as any regular serial communication. The difference is the port you specify must be a bluetooth one.
If you want to use WinAPI, I suggest to check C++ articles on that topic. Recently I saw a very good article on codeproject, but can't locate it. now.
If you are using C#, I'm sure there are components for serial components that will do the job for you.
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i want code in J2me or java
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ya you can do refer to nokia fourms j2me it will be usefull
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