NewLC - problem with comparing str - Comments

problem with comparing str

chishti_hameed — Wed, 11 May 2005 14:27:10 +0200

doesnt it have any name?

problem with comparing str

didster — Wed, 11 May 2005 13:27:48 +0200

Tricky question.

Offically, Security::NewL - "Chooses the strongest avialable cypher"

What that is depends on the phone/sdk, so there isn't one anwser.

Cipher Example

chishti_hameed — Wed, 11 May 2005 12:07:42 +0200

do u know what algorithm "Cipher Example" which comes with sdk uses for encryption/decryption?

problem with comparing str

didster — Wed, 11 May 2005 12:02:01 +0200

http://www.newlc.com/article.php3?id_article=773&var_recherche=descriptors

Plus others on here

:-)

chishti_hameed — Wed, 11 May 2005 11:54:11 +0200

MY 1000000000 POINTS to you
that was really nice way explaining

"There are plently of tutorials on descriptors, go have a read. "

i did search in net but didnt find any explaining this way as u did, do u know any url?

problem with comparing str

didster — Wed, 11 May 2005 10:55:48 +0200

Descriptors _are_ things like CString.

Never ever do you deal with raw char[]/wchar_t[] arrys. Descriptors provide length management, searching functions, and all that - just like CString does.

What I mean is the differece between them is internally, TDes8 stores char[] and TDes16 stores wchat_t[]. You don't notice the difference.

In realility, you really manly use TDes (which as I said, is TDes16 really) for strings. TDes8 is usually always used day-to-day for binary data.

Only when you get the odd occasional app that needs its strings in ASCII format, do you use TDes8 for strings. Perhaps you want to write out a ASCII text file or something.

Nativaly, Symbian OS uses Unicode strings, so most API's take Unicode strings.

The "difference" (wrong word) is basically (this is TDes16 but the same applies for TDes8):

TDes is an abstract base class.
TBuf derives from TDes and actually owns the data it stores (thing CString)
TPtr dervices from TDes, but doesn't own the data it stores - the data is else where and TPtr manuipliates this data.

You then have all the same again with the const variants (C on the end) which are the same, but they can only read the data they refrence, not modify it.

There are plently of tutorials on descriptors, go have a read.

TBuf

chishti_hameed — Wed, 11 May 2005 10:48:59 +0200

what about : TBuf and stuff like that?

cool

chishti_hameed — Wed, 11 May 2005 10:48:06 +0200

is there smth like CString(MFC) in Symbian?

problem with comparing str

didster — Wed, 11 May 2005 10:45:25 +0200

Talking characters (strings)

TDes8 holds 8-bit ASCII data
TDes16 holds 16-bit Unicode data.
TDes is a type def for TDes16.

So in Windows speak, you'd use TDes8 where you would use char* and TDes16 where you would use wchar_t*.

Since TDes8 stores things 8-bits wide, and it's length counted, it can also be used (and is extensivly used) to store raw binary data.

problem with comparing str

chishti_hameed — Wed, 11 May 2005 10:42:03 +0200

buff = Buffer realted stuff

whats difference between TDes16 and TDes8 ?

problem with comparing str

didster — Wed, 11 May 2005 10:23:10 +0200

int to des and des to int are simple - TDes.AppendNum and TLex.Val.

Once you have a des, you can then if you really want to get a wchar_t* by using Ptr().

If you want a char*, then convert the TDes16 to a TDes8 using .Copy and then use Ptr() on the des8.

Whats "buff"?

hmmm

chishti_hameed — Wed, 11 May 2005 05:46:17 +0200

well i wanna know following :
conerting:

char -> str
buff -> str
str -> buff
int -> str
str -> int

TDes? TDesC? e.t.c...? and other stuff like this

problem with comparing str

didster — Tue, 10 May 2005 16:49:33 +0200

Type conversion? Na, not that I know of.

It's not that tricky though.

What ya wanna know?

.

chishti_hameed — Tue, 10 May 2005 16:21:58 +0200

btw is there any good article about "type convertion" in SymbianOS?

it seems really hard as comparing to VC++/MFC stuff WinOS.

:P

chishti_hameed — Tue, 10 May 2005 16:19:47 +0200

I'm able to send simple text and getting sms too ...

HELP MAN

problem with comparing str

Tue, 10 May 2005 08:20:44 +0200