C / C++ / MFC

4-Jul-07 0:32

Is this a good tip? I dont believe so. Unsure | :~

(I answered him to)

Greetings from Germany

delete [] buffer Issue

Programm3r3-Jul-07 20:52

Re: delete [] buffer Issue

3-Jul-07 20:52

Hi all,

How would one go about using the delete command when working with AnsiString?
I have tried:

AnsiString Test;
...
delete [] Test;

But received this error: [C++ Error] E2157 Deleting an object requires exactly one conversion to pointer
operator.

Can anyone help me?

Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
My Blog: ^_^

baerten3-Jul-07 20:59

baerten

3-Jul-07 20:59

AnsiString Test;

is'n allocated dynamically, so you don't need to delete it;

Even it's allocated dynamically via AnsiString *str = new AnsiString("test");

you only need to delete it via "delete str" and not via "delete[] str"

Regards

Re: delete [] buffer Issue

Programm3r3-Jul-07 21:04

3-Jul-07 21:04

Thanks you for the very valuable information Smile | :)

Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
My Blog: ^_^

Free a block of memory

Programm3r3-Jul-07 21:52

Re: Free a block of memory

3-Jul-07 21:52

I have read this article:Memory leaks in C++ and how to avoid them[^] , and it stated the following:

A memory leak is what happens when you forget to free a block of memory allocated with the new operator
or when you make it impossible to do so.

So can I assume that that one only free's a block of memory when the new operator was used.
i.e.

char *string;
string = new char[20];
delete [] string;

// not using delete
char *tString = "this is a test; // is it nessacery to delete this pointers memory??

Many Thanks
Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
My Blog: ^_^

Rajkumar R3-Jul-07 23:57

Rajkumar R

3-Jul-07 23:57

Programm3r wrote:
So can I assume that that one only free's a block of memory when the new operator was used.
i.e.

Programm3r wrote:
char *tString = "this is a test; // is it nessacery to delete this pointers memory??

You can assume so, compiler allocated memory for constant string and let the compiler free's it.

Re: Free a block of memory

Programm3r4-Jul-07 0:59

Re: Free a block of memory

4-Jul-07 0:59

Thanks Rajkumar Smile | :)

Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
My Blog: ^_^

KarstenK4-Jul-07 0:36

4-Jul-07 0:36

Read the MSDN about new and delete ... D'Oh! | :doh:

Greetings from Germany

need help

gentleguy3-Jul-07 20:40

gentleguy

3-Jul-07 20:40

Dear all

I need to develop a new algorithm for clustering( for example, human, animal and inanimate objects). actually this is a brand new topic for me. i never did such topic before. does anyone has any clustering code using VC++, let me work as reference. thanks a lot.

urgent!!!!!!!!!

Li Zhiyuan

4/07/2007

Re: need help

KarstenK3-Jul-07 20:59

3-Jul-07 20:59

Think about a class structure. Basic class maybe "CObject" and derive other classes with additional features. They all can you put in a CObjArray. (MFC)

This is a real student task. Blush | :O

Greetings from Germany

Text Direction

Try3-Jul-07 20:09

3-Jul-07 20:09

Hi all,
How to find programmatically (C++/MFC) whether entered text is LTR - Left To Right (English) or RTL - Right To Left (Arabic) text.

Thank you

G Haranadh3-Jul-07 20:36

G Haranadh

3-Jul-07 20:36

HI. Is this question is regarding a particular control or edit box / OR / any for string?

Nice talking to you. Blush | :O

If you judge people, you have no time to love them. -- Mother Teresa

Try3-Jul-07 20:54

3-Jul-07 20:54

String

KarstenK3-Jul-07 21:13

3-Jul-07 21:13

This depends on the actual system language better check this with GetLocaleInfo(...)

Greetings from Germany

Try3-Jul-07 22:59

3-Jul-07 22:59

What if Locale is Set to English, and Arabic is selected from Language Bar. GetLocaleInfo() won't help..

Re: Text Direction (Long)

Matthew Faithfull4-Jul-07 4:35

Matthew Faithfull

4-Jul-07 4:35

Each entered character has a UNICODE code point. It is possible to look at the numerical value of that code point and determine what language it is from by what range of numbers it is in. I don't have the windows code to hand as I'm not at work today but you'll probably want to look at The UNICODE consortium[^] for a start to get an idea of what LTR and RTL languages are defined. Part of the information windows will give you on any given character is an RTL flag. This on its own is not enough to determine language though as both Hebrew and Arabic RTL languages are supported on Windows.
I spent most of last year developing a mixed LTR/RTL English/Arabic/Chinese/Japanese/Korean capable edit control for Windows CE and my brain only partially melted Laugh | :laugh:

Nothing is exactly what it seems but everything with seems can be unpicked.

Matthew Faithfull4-Jul-07 23:03

Matthew Faithfull

4-Jul-07 23:03

Below is the table of range beginings for UNICODE character ranges. I'm not sure where we got these from if it wasn't the UNICODE Consortium then it was probably Microsoft.
You'll notice there are 3 ranges for Arabic. One for the stand alone letter forms and 2 for the joined/shaped forms. Your users will usually be typing the stand alone letter forms so you'll want to use the ScriptShape API to turn the string into presentation form before you display it or they will no doubt get upset Sigh | :sigh:

(On XP+ DrawText will do this for you) On the other hand they may copy and paste text that's already in presentation form into your app OMG | :OMG:

It these lovely little things that make Arabic text entry so much fun Big Grin | :-D

#define USR1_BASICLATIN 0x0000000000000001ui64
#define USR1_LATIN1SUPPLEMENT 0x0000000000000002ui64
#define USR1_LATINEXTENDEDA 0x0000000000000004ui64
#define USR1_LATINEXTENDEDB 0x0000000000000008ui64
#define USR1_IPAEXTENSIONS 0x0000000000000010ui64
#define USR1_SPACINGMODIFIERS 0x0000000000000020ui64
#define USR1_COMBININGDIACRITICALMARKS 0x0000000000000040ui64
#define USR1_GREEKCOPTIC 0x0000000000000080ui64
#define USR1_RESERVED1 0x0000000000000100ui64
#define USR1_CYRILLIC 0x0000000000000200ui64
#define USR1_ARMENIAN 0x0000000000000400ui64
#define USR1_BASICHEBREW 0x0000000000000800ui64
#define USR1_RESERVED2 0x0000000000001000ui64
#define USR1_BASICARABIC 0x0000000000002000ui64
#define USR1_RESERVED3 0x0000000000004000ui64
#define USR1_DEVANAGARI 0x0000000000008000ui64
#define USR1_BENGALI 0x0000000000010000ui64
#define USR1_GURMUKHI 0x0000000000020000ui64
#define USR1_GUJARATI 0x0000000000040000ui64
#define USR1_ORIYA 0x0000000000080000ui64
#define USR1_TAMIL 0x0000000000100000ui64
#define USR1_TELUGU 0x0000000000200000ui64
#define USR1_KANNADA 0x0000000000400000ui64
#define USR1_MALAYALAM 0x0000000000800000ui64
#define USR1_THAI 0x0000000001000000ui64
#define USR1_LAO 0x0000000002000000ui64
#define USR1_GEORGIAN 0x0000000004000000ui64
#define USR1_RESERVED4 0x0000000008000000ui64
#define USR1_HANGULJAMO 0x0000000010000000ui64
#define USR1_LATINEXTENDEDADDITIONAL 0x0000000020000000ui64
#define USR1_GREEKEXTENDED 0x0000000040000000ui64
#define USR1_GENERALPUNCTUATION 0x0000000080000000ui64
#define USR1_SUBSCRIPTSSUPERSCRIPTS 0x0000000100000000ui64
#define USR1_CURRENCYSYMBOLS 0x0000000200000000ui64
#define USR1_COMBININGDIACRITICALMARKSFORSYMBOLS 0x0000000400000000ui64
#define USR1_LETTERLIKESYMBOLS 0x0000000800000000ui64
#define USR1_NUMBERFORMS 0x0000001000000000ui64
#define USR1_ARROWS 0x0000002000000000ui64
#define USR1_MATHEMATICAL 0x0000004000000000ui64
#define USR1_MISCTECHNICAL 0x0000008000000000ui64
#define USR1_CONTROLPICTURES 0x0000010000000000ui64
#define USR1_OCR 0x0000020000000000ui64
#define USR1_ENCLOSEDALPHANUMERICS 0x0000040000000000ui64
#define USR1_BOXDRAWING 0x0000080000000000ui64
#define USR1_BLOCKELEMENTS 0x0000100000000000ui64
#define USR1_GEOMETRICSHAPES 0x0000200000000000ui64
#define USR1_MISCSYMBOLS 0x0000400000000000ui64
#define USR1_DINGBATS 0x0000800000000000ui64
#define USR1_CJKSYMBOLSPUNCTUATION 0x0001000000000000ui64
#define USR1_HIRAGANA 0x0002000000000000ui64
#define USR1_KATAKANA 0x0004000000000000ui64
#define USR1_BOPOMOFO 0x0008000000000000ui64
#define USR1_HANGULCOMPATIBILITYJAMO 0x0010000000000000ui64
#define USR1_RESERVED5 0x0020000000000000ui64
#define USR1_ENCLOSEDCJKLETTERSMONTHS 0x0040000000000000ui64
#define USR1_CJKCOMPATIBILITY 0x0080000000000000ui64
#define USR1_HANGUL 0x0100000000000000ui64
#define USR1_SURROGATES 0x0200000000000000ui64
#define USR1_RESERVED6 0x0400000000000000ui64
#define USR1_CJKUNIFIEDIDEOGRAPHS 0x0800000000000000ui64
#define USR1_PRIVATEUSE 0x1000000000000000ui64
#define USR1_CJKCOMPATIBILITYIDEOGRAPHS 0x2000000000000000ui64
#define USR1_ALPHABETICPRESENTATIONFORMS 0x4000000000000000ui64
#define USR1_ARABICPRESENTATIONFORMSA 0x8000000000000000ui64
#define USR2_COMBININGHALFMARKS 0x0000000000000001ui64
#define USR2_CJKCOMPATIBILITYFORMS 0x0000000000000002ui64
#define USR2_SMALLFORMVARIANTS 0x0000000000000004ui64
#define USR2_ARABICPRESENTATIONFORMSB 0x0000000000000008ui64
#define USR2_HALFWIDTHANDFULLWIDTHFORMS 0x0000000000000010ui64
#define USR2_SPECIALS 0x0000000000000020ui64
#define USR2_TIBETAN 0x0000000000000040ui64
#define USR2_SYRIAC 0x0000000000000080ui64
#define USR2_THAANA 0x0000000000000100ui64
#define USR2_SINHALA 0x0000000000000200ui64
#define USR2_MYANMAR 0x0000000000000400ui64
#define USR2_ETHIOPIC 0x0000000000000800ui64
#define USR2_CHEROKEE 0x0000000000001000ui64
#define USR2_CANADIANABORIGINALSYLLABICS 0x0000000000002000ui64
#define USR2_OGHAM 0x0000000000004000ui64
#define USR2_RUNIC 0x0000000000008000ui64
#define USR2_KHMER 0x0000000000010000ui64
#define USR2_MONGOLIAN 0x0000000000020000ui64
#define USR2_BRAILLE 0x0000000000040000ui64
#define USR2_YI 0x0000000000080000ui64
#define USR2_TAGALOG 0x0000000000100000ui64

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: Text Direction (Long)

Try4-Jul-07 23:24