Re: C/C++ complete reference material - C / C++ / MFC Discussion Boards

Zac Howland25-Aug-06 9:54

25-Aug-06 9:54

Oliver123 wrote:
1. Each file is compiled separately and independently. This means each .ccp and .h file is compiled as a stand alone unit.

*.cpp files are compiled, not *.h files. CPP files are where the implementation for classes, functions, etc are placed. H files are where they are defined. This allows other modules (classes, libraries, etc) to see the definition of a function or class without having to know how everything is implemented during the compilation.

Oliver123 wrote:
2. If #1 is correct, then each file must contain all the class and function declarations to which any code in that file will refer.

You can't use a function/class/variable/etc unless you know how it is defined.

Oliver123 wrote:
3. The same header file with class declarations can be #included in several other files. In other words, trans.h can be included in both abc.ccp and xyz.cpp.

This is correct. Though usually you place #pragma once or #ifdef/#define statements around the header file content to prevent a file from being included multiple times.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: Basic concepts

C^hris L^osinger25-Aug-06 10:17

C^hris L^osinger

25-Aug-06 10:17

Oliver123 wrote:
his means each .ccp and .h file is compiled as a stand alone unit.

it helps to think of #include "foo.h" as doing exactly what "include" implies: the preprocessor reads the contents of foo.h and, in effect, sticks that in the place of the #include line. the compiler doesn't really look at foo.h directly.

and, you can #include anything.

image processing | blogging

Howto draw a rotated ellipse with MFC

AnTri25-Aug-06 7:35

AnTri

25-Aug-06 7:35

Hey,

how can I draw a rotated ellipse with MFC. The only way I found out to draw ellipse is to use CDC:Ellipse. The way requires a rect...

Is there any other way?

Thank you for your help

Re: Howto draw a rotated ellipse with MFC

Zac Howland25-Aug-06 8:09

Zac Howland

25-Aug-06 8:09

One way would be to draw it unrotated and then to use CDC::ModifyWorldTransform to do the rotation.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

C/C++ complete reference material

9ine25-Aug-06 6:13

9ine

25-Aug-06 6:13

Is there online thorough and complete C/C++ manual with all minute details of abstract, virtual, overloading etc..

9ine

Re: C/C++ complete reference material

David Crow25-Aug-06 6:15

David Crow

25-Aug-06 6:15

Have you tried Googling for the information?

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Re: C/C++ complete reference material

9ine25-Aug-06 6:20

9ine

25-Aug-06 6:20

9ine

Re: C/C++ complete reference material

Zac Howland25-Aug-06 6:34

Zac Howland

25-Aug-06 6:34

For online sources ... use Google.

For offline, check out books by Scott Meyers and Herb Sutter.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: C/C++ complete reference material

Mike Dimmick25-Aug-06 6:43

Mike Dimmick

25-Aug-06 6:43

Yes, but you have to pay for it. The C++ standard is available in PDF from ANSI here[^] (costs $30).

Stability. What an interesting concept. -- Chris Maunder

Re: C/C++ complete reference material

Dave Calkins25-Aug-06 16:46

Dave Calkins

25-Aug-06 16:46

You can also use the free online MSDN language reference.

MSDN C/C++ Languages[^]

Differences between embedded and regular VC++ [modified]

JWood25-Aug-06 5:18

JWood

25-Aug-06 5:18

From people that know, are skills in VC++ translateble to the embedded / mobile version? What are the main differences?

-- modified at 11:27 Friday 25th August, 2006

A cynic is a man who, when he smells flowers, looks around for a coffin.
-H.L. Mencken

Re: Differences between embedded and regular VC++

Jun Du25-Aug-06 5:41

Jun Du

25-Aug-06 5:41

To some degree. Mobile SDK is usually only a subset of the regular SDK, with some mobile extensions.

Best,
Jun

Re: Differences between embedded and regular VC++ [modified]

JWood25-Aug-06 9:21

JWood

25-Aug-06 9:21

Thanks

A cynic is a man who, when he smells flowers, looks around for a coffin.
-H.L. Mencken

Re: Differences between embedded and regular VC++

Zac Howland25-Aug-06 6:36

Zac Howland

25-Aug-06 6:36

In general, the embedded version of the SDK is a subset of the non-embedded version. Basic C++ skills are the same, but you do have to take extra care when dealing with memory allocation and stack limitations.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Re: Differences between embedded and regular VC++

JWood25-Aug-06 9:21

JWood

25-Aug-06 9:21

Thanks.

A cynic is a man who, when he smells flowers, looks around for a coffin.
-H.L. Mencken

CryptEncrypt in UNICODE

sreenest25-Aug-06 3:53

sreenest

25-Aug-06 3:53

When I am using CryptEncrypt() & CryptDecrypt()functions in my VC++ project which is UNICODE, I'm getting junk values after decrypting. But when the project is _MBCS(Multibyte-character) it is working fine. Did any of you encountered this problem ?
Is there a workaround ?

Re: CryptEncrypt in UNICODE

C^hris L^osinger25-Aug-06 4:32

C^hris L^osinger

25-Aug-06 4:32

can you post the relevant parts of your code?

image processing | blogging

memory leak while creating multiple class objects(same class)?

jalsa G25-Aug-06 3:47

jalsa G

25-Aug-06 3:47

hi all,

i am creating multiple objects for the same class
like calling this function as many times.

Void CMainWindow::OpenDefaultChatwindow()
{
m_dlgChatWindow = new CChatWindow();
m_dlgChatWindow->Create(IDD_DIALOG_CHAT_WINDOW,GetDesktopWindow());
m_dlgChatWindow->SetNewParent(this);
m_dlgChatWindow->ShowWindow(SW_SHOW);
}

but when i delete the object i am able to delete only one object then it is showing memory leaks
because i created multiple same objects and deleting only one object.

How to solve this problem ?

plz help in this issue

venu

Re: memory leak while creating multiple class objects(same class)? [modified]

Cedric Moonen25-Aug-06 4:12

Cedric Moonen

25-Aug-06 4:12

Simply by deleting the previous object before creating a new one (that seems obvious):

Void CMainWindow::OpenDefaultChatwindow()
{
if (m_dlgChatWindow )
delete m_dlgChatWindow ;
m_dlgChatWindow = new CChatWindow();
m_dlgChatWindow->Create(IDD_DIALOG_CHAT_WINDOW,GetDesktopWindow());
m_dlgChatWindow->SetNewParent(this);
m_dlgChatWindow->ShowWindow(SW_SHOW);
}

-- modified at 10:12 Friday 25th August, 2006

Cédric Moonen
Software developer

Charting control [Updated - v1.1]

Re: memory leak while creating multiple class objects(same class)?

Cedric Moonen25-Aug-06 4:19

Cedric Moonen

25-Aug-06 4:19

Mmhhh, maybe I answered too fast to your question. You would like several windows opened together or just one ? If just one, see my previous post.

In the other case, you have to store all those pointers in an array and delete them afterward (or when it is needed). I suggest that you take a look at the std::vector class to store all these pointers.

Cédric Moonen
Software developer

Charting control [Updated - v1.1]

how to end process in task maneger

MikeRT25-Aug-06 3:02

MikeRT

25-Aug-06 3:02

Hi,
I want to end the EXCEL.exe process in task manager through application. Is their is any API which get the handle of process and end it .
Can anybody help me out of this problem?

Thanks:
Mike

Re: how to end process in task maneger

Hamid_RT25-Aug-06 3:12

Hamid_RT

25-Aug-06 3:12

See TerminateProcess(...)

WhiteSky

Re: how to end process in task maneger

MikeRT25-Aug-06 3:20

MikeRT

25-Aug-06 3:20

Hi,
Thanks. But can you please elaborate it in more detail?

Thanks:-
Rajiv

Re: how to end process in task maneger

Hamid_RT25-Aug-06 3:46

Hamid_RT

25-Aug-06 3:46

well you have four ways.
1-see msdn
2-a lot of articles about process
3-an article from Mr David Crow about processes
4-see here

<br />
(1)EnumProcesses(this method retrieve identifier for each process);<br />
<br />
(2)hProcess = OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, FALSE,process identifier);<br />
<br />
(3)TerminateProcess(hProcess ,0);<br />

I hope its good for you Smile | :)

WhiteSky

Re: how to end process in task maneger

David Crow25-Aug-06 5:15

David Crow

25-Aug-06 5:15

WhiteSky wrote:
3-an article from Mr David Crow about processes

Of the three that I've created, none of them are about terminating processes.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

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