Re: Button Color In MFC - C / C++ / MFC Discussion Boards

Aescleal25-Apr-12 5:15

25-Apr-12 5:15

A single key class would work as well. I've usually used one for the private key and one for the public key but thats probably just a matter of taste.

The abstract base class thing...

What I was suggesting was defining an interface class:

C++

class encryptor
{
    public:
        virtual bool encrypt( ... ) = 0;
        virtual bool decrypt( ... ) = 0;
};

and you'll have an implementation like:

C++

class RSA_encryptor : public encryptor
{
    public:
        virtual bool encrypt( ... );
        virtual bool decrypt( ... );
};

then when you write your client code it uses the encryptor interace, creating an RSA_encryptor to do your stuff. It's be something like:

C++

void do_something( encryptor *enc )
{
   // Do fab and groovy stuff through the interface
}

int main()
{
    key k(...);
    RSA_encryptor rsa( &key );

    do_something( &rsa );
}

This means that do_something can be unit tested by chucking in a mock encryptor and if you ever need to change algorithm you can just change the top level declaration and it all works swimmingly.

Hope that helps,

Cheers,

Ash

Re: Design Practices, implementing RSA

Vidit Ochani25-Apr-12 10:02

Vidit Ochani

25-Apr-12 10:02

Wow.. I understand now and can see the benefits of using that too. I often miss using this OOP features. Can you please suggest me some good book for learning the usage of OOP features in C++(advanced C++)?

Thanks again Ash Smile | :)

Re: Design Practices, implementing RSA

Aescleal27-Apr-12 1:35

Aescleal

27-Apr-12 1:35

I don't know of any C++ text that does a good job at OO design.

I'd have a look at "Design Patterns: Elements of Reusable Object-Oriented Software" by Gamma, Helm, Johnson and Vlissides. It's nearly 20 years old but goes over some common design templates (for the want of a better word) that you can integrate into your code. The C++ implementations are complete rubbish but the underlying principles are well worth a look. Incidentally when you read articles/other books/forums about OO design and implementation this book is called the GoF (Gang Of Four).

Other more advanced books that are worth a read are "Exceptional C++" by Herb Sutter - it's got a lot about how to implement classes to break dependencies but less about how to actually do OO stuff. Still worth a read.

"Agile Software Development, Principles, Patterns, and Practices" by Robert C. Martin. It's got a rehash of some of the GoF patterns which is more accessible. It's mostly about how to develop software but there's a fair amount of material on OO desing and programming. Unfortunately the examples are in Java but the text surrounding it is well worth a read.

If you have access to a good public or academic library then it might be worth getting a loan off them first before going bananas and spending loads of cash.

Ash

Button Color In MFC

002comp24-Apr-12 0:40

002comp

24-Apr-12 0:40

Hello Friends

I am creating a dialog based Application in which I am creating several Tabs.I am adding seven button to this Dialog also.
Now,I want to set the some color on Button. And,On Tab change ,I want to change the colors of button too.

Any Ideas?
Thanks & regards
Yogesh