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ForNow wrote: a typical way of altering functionality would be to declare a method as Virtual that way the derived class can implement Its version of the method
Yes. That's polymorphism (through inheritance)
ForNow wrote: Since dervied members can have thier version of the Base('s) constructer that would be a way of altering the functionality
Yes. Derived class constructors can also both alter and extend the base class constructor
implementation, but it's not quite the same as overriding a virtual function. There's
nothing virtual about constructors.
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
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Thankx I think I am ready to code.... After being a Dinasour Assembler programmer for 30 years writting procedurel code its hard to change my way thinking
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Have fun! I coded a few years in assembler and C before C++, but not 30 
Thinking in terms of classes will be second-nature in no time.
Cheers,
MArk
Mark Salsbery
Microsoft MVP - Visual C++
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Puncuation of some sort would extremely help in getting your ideas across.
Though I speak with the tongues of men and of angels, and have not money, I am become as a sounding brass, or a tinkling cymbal.
George Orwell, "Keep the Aspidistra Flying", Opening words
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can i add a quetion on the end?
i have a base class animalClass.hpp i have a derived Dog class and main in dogObj.cpp and a derived Cat class in catObj.cpp what i wanted to know is should i have animalClass.hpp dogClass.hpp, catClass.hpp, declaring the classes and have a seperate animalObj.cpp for main() to constrol the functions etc? at the moment my animalClass is about fifty lines as are the other animal classes, with my main () about 80 lines
thanks in advance
paul
if ignorance is bliss then knock the smile off my face!!!
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1slipperyfish wrote: should i have animalClass.hpp dogClass.hpp, catClass.hpp, declaring the classes and have a seperate animalObj.cpp
you need header files (.h, .hpp) if you want to use the classes in other .cpp files so they can be #include < ...>
If the class is defined in a cpp file the visibility of it is limited to (not sure) that file maybe.
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thanks for the reply led mike 
i have rewritten my classes into baseClass.hpp, CatClass.hpp, and DogClass.hpp with farms.cpp initialising the functions and having main()
i had a lot of trouble compiling as it kept saying i had already declared my Mammal class in baseClass however if you add [code]#ifndef BASE_CLASS_HPP
#define BASE_CLASS_HPP[/code] at the top of baseClass.hpp and [code]#endif[/code] at the bottom it works.
you all probably already new that but i've just wasted 2 1/2 hours of my life learning that the hard way
thanks again
paul
if ignorance is bliss then knock the smile off my face!!!
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MAybe I shouldn't answer this after all I work as a MainFrame Assembler Dino programmer
I think think if you declare it in the code/obj/cpp you just have to qualify the method with Class name e.g. DogClass :: dogmethod saying that this dogmethod is releated to the dogalass Class
Trying to get into the future.....
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thanks
paul
if ignorance is bliss then knock the smile off my face!!!
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Hi there. I'm pretty new to coding, I'm trying to (slowly but surely) design a program to receive data from a dyno that I'm fabricating. I'm guessing I'd best use the serial port, from what I read using USB 2.0 is pretty much harder. I'd be putting together a microsystem using either a microprocessor or my own electronics. I'd have to transmit data like engine rpm, air/fuel ratio, dyno drum speed etc. Is there a way to read analogue signals with a pc or can it only use digital signals?
If anyone has some good links or books on communicating with the outside world using a pc, I'd love to have some. Thanks a bunch!
Brian
Yup, I'm a NEWB
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You may want to post this on the hardware board[^].
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Alrighty, thanks for the quick reply!
Brian
Yup, I'm a NEWB
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We are using the February 2006 version of DirectX. When we insert the following line:
#define new DEBUG_NEW
we get the following errors from the Directx Modules:
c:\program files\microsoft directx sdk (february 2006)\include\d3dx9math.h(392)
: error C2059: syntax error : 'string'
c:\program files\microsoft directx sdk (february 2006)\include\d3dx9math.h(392)
: error C2091: function returns function
c:\program files\microsoft directx sdk (february 2006)\include\d3dx9math.h(392)
: error C2802: static member 'operator new' has no formal parameters
c:\program files\microsoft directx sdk (february 2006)\include\d3dx9math.h(393)
: error C2059: syntax error : 'string'
c:\program files\microsoft directx sdk (february 2006)\include\d3dx9math.h(393)
: error C2090: function returns array
c:\program files\microsoft directx sdk (february 2006)\include\d3dx9math.inl(987
) : error C2761: 'void *(__cdecl *_D3DXMATRIXA16::operator new(void))(size_t)' :
member function redeclaration not allowed
c:\program files\microsoft directx sdk (february 2006)\include\d3dx9math.inl(987
) : fatal error C1903: unable to recover from previous error(s); stopping compil
ation
How can we take advantage of the DEBUG_NEW capability and also get around these errors?
BRC
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Defining DEBUG_NEW after any included header files has always worked for me.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Ok - I'll try that. We wanted to define the DEBUG_NEW option in a general header file, but we will include it later on.
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hi all
i am making mfc activex control. i want to assign short cut keys to buttons placed on dialog box.
pls help me what should i do
thanx
ggggggggggg
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maulesh bhojani wrote: i want to assign short cut keys to buttons placed on dialog box.
Are you referring to mnemonics?
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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no. i m new to MFC if possible describe the same.
thanx
mbho
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Then I'm a bit confused as to what you are after.
Keyboard shortcuts
Accelerator table
Keyboard mnemonics
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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hi all,
When "ESC" key Or "ENTER" key is pressed on the dialog, the dialog box is closed. What do i do to prevent this from happening.
I want to force the user to press the close button on my dialog to close the application.
Thanks a lot for all the help extended to me by taking all the trouble away from me.
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wajape wrote: What do i do to prevent this from happening.
Read the FAQ.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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You can insert a button to dialog and then use of OnOK() or OnCancel() for exit.
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You have to write the following in the dialog class (say CMyDlg):
void OnOK() { }<br />
void OnCancel() { }
Also have to map WM_CLOSE and in the mapped function do the following:
void CMyDlg::OnClose()<br />
{<br />
EndDialog( 0 );<br />
}
- NS -
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