VLDB question... - C / C++ / MFC Discussion Boards

toxcct25-Jan-04 22:58

25-Jan-04 22:58

if you want to allocate a table (whatever its size and its dimension) depending on the datas inside, you don't have other ways to use dynamic allocation. if you are in C, use malloc(), calloc(), realloc(), but be careful, they are non-reantrant functions. if you program in C++, prefer new operator, and even if it sizes you source by adding code lines on the treatment of the memory, you win in the place your datas take in memory...

TOXCCT

Re: C++ Question.

WREY26-Jan-04 3:58

WREY

26-Jan-04 3:58

Thanks for replying.

The problem is NOT with the allocation of memory. Operator 'new' makes easy job of that (providing there is enough space on the heap). The problem is getting around the compiler's insistence that the size of the array be known at compile time. That IS the problem!!

The main objective is NOT whether memory is to be statically allocated, or dynamically allocated. The main problem is with the SIZE of the memory I wish to allocate, which the compiler is insisting it MUST know at compile time.

I am trying to find out if there is a way I can let the compiler know that information at run time, which so far it is saying, "NO!!"

William

Fortes in fide et opere!

Re: C++ Question.

toxcct26-Jan-04 6:35

toxcct

26-Jan-04 6:35

could you please show me a line you wrote to which the compiler says "NO"...

i don't really understand why it would answer like that...

thanks

TOXCCT

Re: C++ Question.

WREY26-Jan-04 10:14

WREY

26-Jan-04 10:14

It's a figure of speech I was using.

William

Fortes in fide et opere!

convert .net project to vs6 project

sstoyan24-Jan-04 3:28

sstoyan

24-Jan-04 3:28

hi i read in an article that there is a utility here on codeproject to convert vs.net projects to vs6 project, but i cant find it.
could somebody point me to it ?

thanx

Re: convert .net project to vs6 project

Jörgen Sigvardsson24-Jan-04 5:11

Jörgen Sigvardsson

24-Jan-04 5:11

Perhaps this could be of some help: http://www.codeproject.com/tools/prjconverter.asp[^]

--
C'est normal!

Re: convert .net project to vs6 project

sstoyan25-Jan-04 1:30

sstoyan

25-Jan-04 1:30

thank you very much
thats seems exactly like it

VLDB question...

Orkun GEDiK24-Jan-04 2:01

Orkun GEDiK

24-Jan-04 2:01

Howdy friends!

I'm working on project about VLDB. I developed an application server and its SDK. Data size approximately 15.000.000 records which is remain on Microsoft Analysis Services (OLAP). System configuration at below;

2 Hyper Threading Intel Xeon CPU,
2 gb Memory
RAID 1, RAID 5
Windows 2000 Advanced server
Compaq Proliant Server

But, it didn't give expected response time for us (20 secs for 5.000.000 records) . The question is, can i access all of the data in 15 sec. What is the wrong? Anybody can recommend any site or book about vldb?

Thank you

Ahmet Orkun GEDiK
System & Software Support Specialist (SAP R/3)
ASTRON

to make a transparent image

emmatty24-Jan-04 1:50

emmatty

24-Jan-04 1:50

hi freinds,
Can any one help to convert an programmitically generated image transparent

Re: to make a transparent image

Delfny26-Jan-04 8:42

Delfny

26-Jan-04 8:42

How transparent?

Are you talking about alpha chanel or transparency mask
and how to create that mask?

Delf

Using theCArray class with a non trival Class

magpierre24-Jan-04 1:36

magpierre

24-Jan-04 1:36

Hi,

I am trying to use the CArray class as follow:

class CVueAtelier
{
protected :

CArray<cvuecomposant, cvuecomposant=""> vueElementsAtelier;
...
}
where CVueComposant is an abstract class I defined

and when I try to build this is the error I get :

...\include\afxtempl.h(201) : error C2259: 'CVueComposant' : cannot instantiate abstract class due to following members:
...\cvuecomposant.h(15) : see declaration of 'CVueComposant'
...\cvueatelier.h(26) : see reference to class template instantiation 'CArray<class cvuecomposant,class="" cvuecomposant="">' being compiled

Please help me,

Pierre

Re: Using theCArray class with a non trival Class

John R. Shaw24-Jan-04 7:18

John R. Shaw

24-Jan-04 7:18

CArray is a template.

Example: CArray<cpoint,cpoint> ptArray;

INTP

Re: Using theCArray class with a non trival Class

John R. Shaw24-Jan-04 7:20

John R. Shaw

24-Jan-04 7:20

CArray<point,point> ptArray;

INTP

Device Driver Programming

A_Fa24-Jan-04 1:27

A_Fa

24-Jan-04 1:27

We made a hardware for digitizing video data . I want to program a driver for this card . But I dont have soutable document to study driver programming . Please define me soutable document ? Smile | :)

Very Thanks ------>> Rose | [Rose]

;

Re: Device Driver Programming

Anonymous24-Jan-04 2:27

Anonymous

24-Jan-04 2:27

I think you're probably going to want the Microsoft DDK

http://www.microsoft.com/whdc/ddk/winddk.mspx

Regards,

Re: Device Driver Programming

dejones7224-Jan-04 6:38

dejones72

24-Jan-04 6:38

Hello: There are several books available for writing drivers. Assuming that your developing for NT/Win2k/XP the book I recommend is by Walter Oney called "Programming the Microsoft Windows Driver Model, Second Edition ". You will also need to order the DDK from Microsoft.

Dave Jones

Re: Device Driver Programming

wb25-Jan-04 4:39

25-Jan-04 4:39

check this out.

http://www.phdcc.com/WDMarticle.html

Re: Device Driver Programming

toxcct25-Jan-04 23:02

toxcct

25-Jan-04 23:02

is the target of your device driver is on Windows or Unix system, and what is your compiler...

TOXCCT

Unicode ActiveX on 98

Hesham Amin24-Jan-04 1:04

Hesham Amin

24-Jan-04 1:04

Hi,,,
I develop an ActiveX control (ATL 3.0) and I build and test it as unicode on WinXP Pro..
Can this control work fine on Win9x - ME ?
what precautions must I take care of ?
thanks in advance.

Re: Unicode ActiveX on 98

Michael Dunn24-Jan-04 6:17

Michael Dunn

24-Jan-04 6:17

If you call any APIs that aren't implemented as Unicode in 9x (which is almost all of them), then it won't work.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0.1! | RightClick-Encrypt
"Linux is good. It can do no wrong. It is open source so must be right. It has penguins. I want to eat your brain."
-- Paul Watson, Linux Zombie

Re: Unicode ActiveX on 98

Hesham Amin24-Jan-04 10:13

Hesham Amin

24-Jan-04 10:13

thank you..
but what about :Microsoft Layer for Unicode
can i link to it statically so i can distribute the ocx with no dependencies ?

Re: Unicode ActiveX on 98

Michael Dunn24-Jan-04 20:08

Michael Dunn

24-Jan-04 20:08

No, because MSLU is a DLL.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0.1! | RightClick-Encrypt
Pinky, are you pondering what I'm pondering?
I think so Brain, but how will we fit the hamster inside the accordion?

Calling of DHTML Dialog

Inam23-Jan-04 22:40

Inam

23-Jan-04 22:40

How to create a dhtml dialog in vc and then how can we call it through toolbar and i have also to do some processing on the atl component under it using vb script please explain it briefly or tell me some articles
ThanX in advance

Inam

Dialog dissapears... ?

Calder23-Jan-04 22:34

Calder

23-Jan-04 22:34

I've been trying to do something like this in my OnInitDialog:

<br />
CDatabase db;<br />
AnstalldaSet set(&db);<br />
TRY<br />
{<br />
	set.Open();<br />
	if (! set.IsBOF())<br />
	{<br />
		set.MoveFirst();<br />
		while (! set.IsEOF())<br />
		{<br />
			// populate controls on the dialog with member variables from 'set'<br />
			m_Fornamn.SetWindowText(set.m_FORNAMN);<br />
			m_Efternamn.SetWindowText(set.m_EFTERNAMN);<br />
			set.MoveNext();<br />
		}<br />
	}<br />
}<br />
CATCH(CDBException, pDBException)<br />
{<br />
	AfxMessageBox(pDBException->m_strError);<br />
}<br />
END_CATCH<br />
		<br />
set.Close();<br />
<br />
return TRUE;  // return TRUE  unless you set the focus to a control<br />

However, I get a strange problem - when I started the app the first time, it all worked great.
However, when I closed the app it didn't dissapear from the Processes view in the taskmanager. If I stop the process it won't run again... I tried restarting the computer, but that doesn't help either.
Does anybody have a clue? I don't...

BTW, when I double click to start the program (or CTRL+F5 in VisualC++) it appears in the Processes view, and in MySQL Admin as an open thread. But the dialog never shows on the screen! OMG | :OMG:

(It's a normal App-Wizard generated dialog app, with the only addition of a CRecordset class!)

Big thanks to DavidCrow for helping with the recordset...

Re: Dialog dissapears... ?

Antti Keskinen23-Jan-04 22:57

Antti Keskinen

23-Jan-04 22:57

Your problem is with the record set object.

What you are doing is you create the database connection, create a recordset and issue a query, getting a set of results. Then, you run through the complete database and alter the window name/edit box contents based on the results from the database. Your dialog will default to showing the last entry in the database after it is shown.

Instead of browsing through the entire database on the dialog initialization, you should only create and issue the query commands there. Then create a set of Forward/Backward buttons on your dialog to browse through it.

The actual problem may also persist in either the database or the connection into the database. Or it may also reside elsewhere in your program. Try debugging through the application to see what it does. Pay special interest on the HWND of the dialog. If it gets initialized properly, then the dialog is created. If it is not, then the dialog would never show up.

-Antti Keskinen

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