C / C++ / MFC

Re: Class/struct declarations and bit patterns [modified]

20-Dec-07 12:45

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

Mark Salsbery20-Dec-07 13:22

Mark Salsbery

20-Dec-07 13:22

Anthony Appleyard wrote:
But here I am reading from a file format which someone else (probably at Microsoft many years ago) invented.

Why are you not using the Microsoft structure definitions
that have been around just as long?

BITMAPFILEHEADER is packed with 2-byte alignment
BITMAPINFO and BITMAPINFOHEADER are packed with 1-byte alignment.

To see how that affects struct padding and alignment, see

align (C++)[^]
/Zp (Struct Member Alignment)[^]
etc...

If you're going to redefine these structs and expect them to match
everyone else, then you'll probably want to set your structure packing
the same as Microsoft's (see #pragma pack).

*edit*  Also, using platform-specific types like "long" and "short" is a bad<br />
idea if you expect to match the Microsoft definitions.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

modified on Thursday, December 20, 2007 7:40:28 PM

After a picture is tranformed by GDI+, mouse cursor point problem

followait20-Dec-07 5:57

followait

20-Dec-07 5:57

Like DPtoLP, how to do it with GDI+,
use TransformPoints?

Re: After a picture is tranformed by GDI+, mouse cursor point problem

CPallini20-Dec-07 10:16

20-Dec-07 10:16

Yes, it looks promising.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

plzz hlep

coderwizard20-Dec-07 3:45

coderwizard

20-Dec-07 3:45

i has need code for windoz service when starting os.plz send politly.

George L. Jackson20-Dec-07 4:54

George L. Jackson

20-Dec-07 4:54

I think you should search the web before asking here. Your search keys are "c++ windows service"!

http://weblogs.asp.net/kennykerr/archive/2004/05/18/134342.aspx[^]

"We make a living by what we get, we make a life by what we give." --Winston Churchill

coderwizard20-Dec-07 5:19

coderwizard

20-Dec-07 5:19

Thank you for link sir. I search web also.

fearless20-Dec-07 5:05

fearless

20-Dec-07 5:05

0x2A3F

image processing toolkits | batch image processing

C^hris L^osinger20-Dec-07 5:10

C^hris L^osinger

20-Dec-07 5:10

oh hai!
would you like cheezeburger insted?

leckey20-Dec-07 5:15

leckey

20-Dec-07 5:15

Iz can have cheeseburger?

Current Rant: "Oh crap! I forgot Iowa!"
http://craptasticnation.blogspot.com/[^]

David Crow20-Dec-07 5:25

David Crow

20-Dec-07 5:25

No, Iz (mini Izzy?) cannot have a cheeseburger. This is not the food forum.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

leckey20-Dec-07 6:38

leckey

20-Dec-07 6:38

I thought the original was "Iz" but I was wrong.
http://lolcats.com/view/56/[^]

Current Rant: "Oh crap! I forgot Iowa!"
http://craptasticnation.blogspot.com/[^]

CPallini20-Dec-07 5:21

20-Dec-07 5:21

plzz chzzzburger!!!!
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

Hamid_RT20-Dec-07 5:27

Hamid_RT

20-Dec-07 5:27

Is this good for windows service?

CPallini20-Dec-07 5:59

20-Dec-07 5:59

Is good service anyway, with or without nearby windows
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

Hamid_RT20-Dec-07 6:45

Hamid_RT

20-Dec-07 6:45

Yeah

Mark Salsbery20-Dec-07 5:15

Mark Salsbery

20-Dec-07 5:15

Doesn't windoz have an 'e' at the end?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

George L. Jackson20-Dec-07 8:51

George L. Jackson

20-Dec-07 8:51

Not the one that sells fiz filet samchez.

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Hamid_RT20-Dec-07 5:22

Hamid_RT

20-Dec-07 5:22

These articles are helpful for you.
CNTService v1.06 - NT Service Framework[^]
Creating a Simple Win32 Service in C++[^]
How to: Create Windows Services (C++ Programming) [^]
Sending Control Requests to a Service
[^]

David Crow20-Dec-07 5:28

David Crow

20-Dec-07 5:28

As a wizard, you should be able to conjure this up using your How to be a Wizard in 21 Days book that came in your Welcome Package when you joined the Wizard club.

virtual member?

Stan the man20-Dec-07 2:52

Stan the man

20-Dec-07 2:52

Hi.

I am not sure how to explain this but I want to declare a member in a base class. IN a class derived from this, I want to be able to be able to override the member with another class that is derived from that original member.

Ex:

class CBase
{
virtual CTest m_test;

}

class CBase1 : public CBase
{

virtual CTest1 m_test;

}

CTest1 is derived from CTest.

I want to be able to almost use the same name in each class and just add more fuunctionality in the CBase1 class, but CBase will still be able to call fuctions from m_test. Then in CBase1, it can call additional functions available in CTest1... This is like a virtual function but I want to do it for a member variable or something.

I am not sure if I explained it right. Anyone can give me an idea?

Thanks.

Stan the man

image processing toolkits | batch image processing

C^hris L^osinger20-Dec-07 3:01

C^hris L^osinger

20-Dec-07 3:01

there's no such thing as a virtual member.

but, can you make CTest a base class of CTest1 ? then you can override members in CTest to add that additional functionality.

Stan the man20-Dec-07 3:07

Stan the man

20-Dec-07 3:07

Hi Chris.

Yes, that is not a problem. The one thing is that if the (virtual) member/class is already declared in another base class. Then this base class I derive another class. But for this class, I need a slightly different functionality of that "virtual" member/class. But I do not want to disturb the function of the original (virtual) member/ class in that other base class.

You know my meaning? I want to "replace" that class with another class which has identical functions but with some changes...

Thanks.

Stan the man

Maximilien20-Dec-07 3:06

Maximilien

20-Dec-07 3:06

I'm not certain I understand what you want to achieve, but my gut feeling is that you cannot do that.

maybe if you create a base class for CTest and CTest1 and keep a pointer to that class instead of CTest and CTest1 ?

// not tested, and probably will not work as-is 
class CTestBase {};
class CTest : public CTestBase {};
class CTest1 : public CTestBase {};

// and have 

class CBase 
{
 CBase() { m_pTest = new CTest;};
 CTestBase* m_pTest;
};

class Cbase1 : public CBase 
{
 CBase1() { m_pTest = new CTest1;};
 CTestBase* m_pTest;
};

but you will probably need to use something like CBase::m_pTest and CBase1::m_pTest to resolve potential name conflicts.

Maximilien Lincourt
Your Head A Splode - Strong Bad