Re: Thank you . But I didn't want to print it . I only want to save it in a file - C / C++ / MFC Discussion Boards

Reno Tiko23-Jul-01 3:09

23-Jul-01 3:09

I was looking at my code and noticed a bunch of SQL calls in the middle of some of the business logic, and thought that they needed some cleaning up and refactoring. I was wondering if there was a design pattern of some sort that would be useful here.

Basically I'm looking for something that would work similar to the flat file serialization offered by inheriting from CObject and using CArchive to serialize the class, but am looking to instead serialize to a database.

Also, is there a framework of some sort available that supports class <-> ADO database.

Thanks!

Events...

23-Jul-01 2:43

Hello

how can set event at run- time for controls? for example: if i create a button at run-time, how do i "tell" it what to do when is will be clicked?

thanks

RG
Smile | :)

Re: Events...

23-Jul-01 4:07

Implement a class derived form CButton and the override the BN_CLICKED message in there. Create the object of this class then at runtime.

I hope u get this and it works;)

EXE used as DLL?

Danoo23-Jul-01 2:22

Danoo

23-Jul-01 2:22

I have a stand-alone application which exports a class.
How can I load this exe-file statically like a normal dll? I need to create somehow the CDynlinkLibrary object to initialize the runtime-class stack...
Confused | :confused:

How to change a variable to hexadecimal format ???

22-Jul-01 23:29

Re: How to change a variable to hexadecimal format ???

jerry0davis22-Jul-01 23:39

jerry0davis

22-Jul-01 23:39

int a = 10;
printf("a(dec) = %d\n", a);
printf("a(hex) = %X\n", a);
will output

10<br />
a

Thank you . But I didn't want to print it . I only want to save it in a file

23-Jul-01 6:48

I look for a function that doing it

Re: Thank you . But I didn't want to print it . I only want to save it in a file

markkuk23-Jul-01 11:48

markkuk

23-Jul-01 11:48

Hexadecimal, octal and decimal representations of numbers are used only when the number is converted to text for reading by humans. The computer always handles the number as binary.

If you want to save it in a text file as hexadecimal, use the fprintf function instead of printf.

About how to delete object

prog758422-Jul-01 23:04

prog7584

22-Jul-01 23:04

i wrote some code in destructor for the purpose of deletion after object have been used.
by the way, error is occured in "delete pObject" sentence.
i don't know why the sentence is happened.

the code is like the following.

********************************************************************************

CPerson::~CPerson()
{
for(int i=0; i< m_PtArray.GetSize(); i++) // m_PtArray is CObArray type.
{
CObject* pObject = (CObject*)m_PtArray.GetAt(i);
delete pObject;
}

m_PtArray.RemoveAll();
}

********************************************************************************

have a nice day Smile | :)

Re: About how to delete object

Christian Graus23-Jul-01 0:28

Christian Graus

23-Jul-01 0:28

Why do you need to do the case ? Is it not a CObject * already ? If it isn't, then surely the wrong destructor is going to be called ?

Also, have you tried going in reverse order ?

Christian

#include "std_disclaimer.h"

The careful application of terror is also a form of communication.

Eagles may soar, but weasels don't get sucked into jet engines.

Re: About how to delete object

Hrishi23-Jul-01 11:16

Hrishi

23-Jul-01 11:16

Try:

CObject* pObject
for(int i=0; i< m_PtArray.GetSize(); i++) {
pObject = NULL;
pObject = (CObject*)m_PtArray.GetAt(i);
if(pObject)delete pObject;
}

Out of memory

Hadi Rezaee22-Jul-01 21:50

Hadi Rezaee

22-Jul-01 21:50

Hi all,
I'm writing program about database.
In my database i have 3 tables:

CDINFO, PERSON, GETGIVE

And i have 3 fields in CDINFO table:

FILMNAME ---> Text
FILMCODE ---> Integer
COUNT ---> Integer

I'm using of three objects of CDaoRecordset for opening each table ...
Now, i want to add new record in CDINFO:

COleVariant var;
char *szFilm = new char[50];
var.vt = VT_INT;

GetDlgItemText(IDC_EDIT1, szFilm, 50);
var.intVal = GetDlgItemInt(IDC_EDIT2);

m_rsCDINFO->AddNew();
m_rsCDINFO->SetFieldValue("FILMCODE", var);
m_rsCDINFO->SetFieldValue("FILMNAME", szFilm);
m_rsCDINFO->SetFieldValue("COUNT", var);
m_rsCDINFO->Update();

SetDlgItemText(IDC_EDIT1, "");
SetDlgItemText(IDC_EDIT2, "");

delete[] szFilm;

This code have not any error or warning, but when i'll running this code, program indicate to me error about: "Out of memory" !!!
Please tell me, what is my wrong ?

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Use Image in Dll

22-Jul-01 21:11

I need to put a jpeg in a dialog , i used a CImgEdit .
when i use it in a regular mfc application it's working good,
but when i use it in a dll ( the same application but i changed it
from Exe to Dll ) it isn't working.

can someone help me ?

Thanks.

How can I get TextToSpeech API's?

22-Jul-01 21:04

Hello all, I want to use microsoft's text to speech, to let my software speek, but I don't know how and where to get TextToSpeech API, can you help me?

Re: How can I get TextToSpeech API's?

Mark Terrano30-Jul-01 14:14

Mark Terrano

30-Jul-01 14:14

http://www.microsoft.com/speech/
Tons of documents, downloads, and links from there. Good luck.

Who know CHM help file format

inforix22-Jul-01 20:37

inforix

22-Jul-01 20:37

I am developing a chm help file tool, so I need a specification for .chm file, but I cannot find it in microsoft.com, any help? Cry | :((

Thanks!

Re: Who know CHM help file format

Reid23-Jul-01 13:46

Reid

23-Jul-01 13:46

What is the purpose of the .chm file? Is is specific to a particular program or something? That info sure would help me help you.... Smile | :)

-Reid the C++/C# programmer
(Caution: I am a teenager, and that means that I think I know everything...but probably don't...)
Maybe this will help you understand:

CPerson Reid = "Teenager";
CPerson All_C_Programmers[9999999999];
int i;
int num_Programmers_That_Are_Teenagers = 0;
for (i=0;i<9999999999;i++)
{
if (All_C_Programmers[i]=="Teenager")
{
num_Programmers_That_Are_Teenagers++;
}
}
cout << num_Programmers_That_Are_Teenagers;
-------------
1 <------

learn visual c++

22-Jul-01 20:22

how can i learn visual c++ in ashort way or in the long way
but not in along time.where can i get exampels an stuff?
thank you for your help

itai

Re: learn visual c++

Christian Graus23-Jul-01 0:35

Christian Graus

23-Jul-01 0:35

This is bad, bad advice. Some of the books mentioned are good books, but no-one, repeat no-one should EVER set out to learn programming Windows without learning C++. In fact the Visual C++ in 21 days is a very simple book, it was my second. The reason I grasped it easily and this person obviously did not is not my stunning intellect ( ask anyone who has met me ), it's because my first book was C++ in 24 hours. Forget windows, menus and everything else until you know enough C++ to write a linked list, populate it from command line input and write it to a file. Once you know some C++, then you'll know half of the stuff in the Visual C++ book, and you'll be able to concentrate on the other half.

C++ is a language created by Bjarne Stroustrup, which amonst other things added classes to the C language. The C++ language does not know about MFC, you can write Windows programs in C++ without using C++, but MFC is a class library that *does* simplify Windows programming.

I'd also recommend buying books instead of downloading them - it takes forever and in the end they are not practical. The books I downloaded early on I either did not use, or I bought.

Christian

#include "std_disclaimer.h"

The careful application of terror is also a form of communication.

Eagles may soar, but weasels don't get sucked into jet engines.

Re: learn visual c++

Ahmad27-Jul-01 9:04

Ahmad

27-Jul-01 9:04

Thank you
You look very boring ...

AHMAD ALWASHALI

Re: learn visual c++

Christian Graus27-Jul-01 13:40

Christian Graus

27-Jul-01 13:40

I'm sorry if you took my comment personally, but your advice *was* bad, and I'm also sorry that you think learning to program properly sounds 'boring'.

Christian

#include "std_disclaimer.h"

The careful application of terror is also a form of communication.

Eagles may soar, but weasels don't get sucked into jet engines.

Passing Strings and arrays

22-Jul-01 17:22

I was wondering in terms of efficiency, what is the best way of passing strings and arrays around? What is the penalty one incurs when passing a CString as a opposed to a CString * or when you simply pass by reference?

Re: Passing Strings and arrays

Michael Dunn22-Jul-01 17:26

Michael Dunn

22-Jul-01 17:26

If a function takes a CString, a call to the copy constructor is made since the function gets its own copy of the parameter. Passing a CString* or CString& avoids this.
The CString copy constructor is quick (it just increases the string's reference count) but that's not always the case with all classes. If the function is going to just read the string, make the parameter a const CString&, which is best semantically and speed-wise.

--Mike--
http://home.inreach.com/mdunn/
"Make sure that if you are using a blow torch that you don't set anything on fire."
-- Chris Maunder

Opening up Serial Ports in WinNT

Nik Vogiatzis22-Jul-01 17:01

Nik Vogiatzis

22-Jul-01 17:01

does anyone know how to open up a serial port under NT?

i have had no problems with it under 98, but whenever i attempt to get it to work under NT nothing seems to happen...

Confused | :confused:

Nik V

Re: Opening up Serial Ports in WinNT

Joaquín M López Muñoz22-Jul-01 20:20

Joaquín M López Muñoz

22-Jul-01 20:20

There's no fundamental difference between both OSs when it comes to opening serial ports. This should open up "COM1"

HANDLE hCOM1=CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL,                        OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

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