NewLC - File, Streams and Stores - Comments

Re: File, Streams and Stores

rbrunner — Tue, 02 Dec 2008 10:39:02 +0100

No, hard reset per definition reset everything. In fact, the question nearly answers itself, because if something survives hard reset, there is no guarantee that the phone works again afterwards, and the whole purpose of hard reset is defeated.

If some files survived hard reset, one would need a "really hard" reset to be sure to get the phone working again

Re: File, Streams and Stores

diya007 — Tue, 02 Dec 2008 10:00:25 +0100

Hi thanx for the reply.

Ok I can write name value pair using RFile. But is there any place in Symbian storage where I can save this file
so that it retains its data even after the phone has been hard reset and we can read that file and reteive that data?

Thanx

Re: File, Streams and Stores

rbrunner — Thu, 20 Nov 2008 11:31:27 +0100

Unfortunately not, never worked with CPermanentFileStore myself so far.

sample code that shows how to simply read and write using CPermanentFileStore

I am afraid given the complexity of CPermanentFileStore, this won't be simple in any case...

Maybe it would be better for you to stop insisting that you know already the solution quite for sure and only lack some details now. Why not just describe in a few sentences what kind of data you want to store, how big it is, how and how often it will change, so it's possible to give an opinion whether CPermanentFileStore really is the solution to your problem?

Re: File, Streams and Stores

diya007 — Thu, 20 Nov 2008 10:38:17 +0100

Hi thanx for such a quick reply.

Could you give me a sample code that shows how to simply read and write using CPermanentFileStore.
I have been able to create the file using the above in C: of symbian.
But dont know how I could write or read through it, i being a newbie.

Thanx so much in advance

Re: File, Streams and Stores

rbrunner — Thu, 20 Nov 2008 08:21:40 +0100

CPermanentFileStore implements something like a database, where you can store a number of different things, and can also update them after creating. This certainly has its uses, e.g. if your data to store is quite complex.

If you just have a chunk of bytes that you must store somewhere permanently, nobody forces you to use CPermanentFileStore, and that would be overkill anyway in that case, so IMHO it's ok to directly use RFile for simple cases.

By the way, if the data that you want to store has more the character of program settings instead of "true" working data, check whether you can use an INI file which exists for this purpose. Use the forum search with the term "INI" to find threads about this subject.

Re: File, Streams and Stores

diya007 — Thu, 20 Nov 2008 07:51:11 +0100

Ok i agree with what you said. But since the Api has given CPermanentFileStore then there must be some difference between the two?
And thats what i want to know?

Re: File, Streams and Stores

rbrunner — Thu, 20 Nov 2008 07:07:06 +0100

Every simple file is a "permanent store" of sort: Once written, you won't loose your stuff. So why not just use a simple RFile, if CPermanentFileStore is a mystery to you?

Re: File, Streams and Stores

diya007 — Thu, 20 Nov 2008 05:29:01 +0100

Hi all,

Please reply. Its urgent.

Can anyone guide me to write a function to store persistent data from my application using CPermanentFileStore?

Or is there any other way to "write byte array chunk of size in bytes to persistent store"?

Also where is this persistent data stored by CPermanentFileStore?

Thanx

Re: File, Streams and Stores.URGENT!!!

diya007 — Wed, 19 Nov 2008 14:25:29 +0100

Hi all,

Can anyone guide me to write a function to store persistent data from my application using CPermanentFileStore?

Or is there any other way to "write byte array chunk of size in bytes to persistent store"?

Also where is this persistent data stored by CPermanentFileStore?

Thanx

Re: File, Streams and Stores

pointer_raj — Wed, 01 Oct 2008 06:48:49 +0200

really thats very helpful to beginners like me.
cheers to eric ...

thanks a lot

Re: File, Streams and Stores

3AZZK — Thu, 14 Feb 2008 08:08:41 +0100

It's very helpful, thx

Re: File, Streams and Stores

dlingt — Wed, 05 Dec 2007 09:36:32 +0100

good.... thanks!

Re: File, Streams and Stores

sandeepmhptr — Thu, 23 Aug 2007 08:37:39 +0200

fOLLOWING CODE WORKS FOR STORING AND RETRIEVING InetAddr INTO Stream

InetAddr iIpAddress;
TBuf<30> bufTime;
FOR WRITING TO STREAM
-----------------------------------------

iIpAddress.Output(bufTime);
aStream<

FOR READING FROM STREAM
-------------------------------------------
aStream>>bufTime;
iIpAddress.Input(bufTime);

BUT I DID NOT GET SOLN AS FOR TTime and TTimeIntervalSeconds Objects????????

CAN ANY ONE THROW ANY LIGHT ON IT!!!!!!!!!!!!!!!!!!!!!!

Re: File, Streams and Stores

sandeepmhptr — Wed, 22 Aug 2007 07:52:59 +0200

I found some problem in string and retrieving
TTime iTime;
TTimeIntervalSeconds iTimeOffset;
TTime iDate;
TInetAddr iIpAddress;

objects into stream.

Can anyone tell how to write these objects into stream????????

also TInt objects are not written into Stream -------------------

RWriteStream& aStream;
TInt iColor;
aStream<

and I had to use
RWriteStream& aStream;
TInt iColor;
aStream.WriteInt32L(iColor);

how to read and display .html file

santhosh.ram — Tue, 14 Aug 2007 15:02:51 +0200

am trying to read and display the html file.the below code i have used inside the draw function of view class
RFs fs;
fs.Connect();
RFile file;
_LIT(KFileName,"z:\\system\\apps\\sampleprog\\test.html");
file.Open(fs, KFileName, EFileRead);
TFileText fileText;
fileText.Set(file);

TBuf<256> lineText;
while(fileText.Read(lineText) != KErrEof)
{
CWindowGc& gc = SystemGc();
TRect rect( Rect());

if (lineText.Length() > 0)
{
gc.DrawText(lineText, rect, Rect().Height(), CGraphicsContext::ELeft );
}
else
{
gc.Clear( rect );
}

file.Close();
fs.Close();
}
}
am not getting the output.can any one guide me where iam wrong .

File, Streams and Stores

eric — Fri, 24 Jun 2005 09:43:54 +0200