C / C++ / MFC

Re: driving stepper motor

24-Jan-08 3:27

Do you know which pin does what on the motor (e.g., pin 1 is on, pin 2 is off, pin 3 is forward, pin 4 is reverse)?

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Adnan Merter24-Jan-08 4:09

Adnan Merter

24-Jan-08 4:09

i got some information, but finding it was very hard.
it has six wires. two reds, two yellows and two grey.

Grey1 --- --- Grey2
¦ ¦
¦ ¦
Red1 --- --- Red1 (reds are common)
¦ ¦
¦ ¦
Yellow1 --- --- Yellow2

i cannot understand which wire has to be connect to the uln's first output and second etc.

thanks for your answer.

Smile | :)

VTable Madness [modified]

⁷³Zeppelin23-Jan-08 9:49

23-Jan-08 9:49

I'm having trouble with vtables. I have a class:

class CLatticeNode {
    public:
        CLatticeNode(void);     // Default constructor - don't call
        virtual ~CLatticeNode(void);
   
        CLatticeNode(double SpotPrice) { 
        	m_dUnderlyingPrice = SpotPrice;
        	m_dOptionValue = 0.0;
        };
        
        // access functions
        inline double GetUnderlyingPrice(void) const { return this->m_dUnderlyingPrice; };
        inline double GetOptionValue(void) const { return this->m_dOptionValue; };
        
        inline void SetUnderlyingPrice(double Price) { m_dUnderlyingPrice = Price; }; 
        inline void SetOptionValue(double Value) { m_dOptionValue = Value; };
        
    private:	
    	// these member vars hold the price data
    	double m_dUnderlyingPrice;
    	double m_dOptionValue;

};

I have a std::vector of boost pointers declared as follows:

typedef boost::shared_ptr <CLatticeNode> CLatticeNodePtr;

and a vector of vectors:

std::vector< std::vector<CLatticeNodePtr> > Tree;

I'm trying to call the member function GetUnderlyingPrice as follows:

Tree[col].push_back(CLatticeNodePtr(new CLatticeNode((Tree[col-1][row])->GetUnderlyingPrice() * m_dU)));

Basically I'm trying to access the CLatticeNode member function GetUnderlyingPrice via
the call:

Tree[col-1][row]->GetUnderlyingPrice()

But on compile, I consistently get:

g++ -L/usr/local/boost-1.34.1 -o "AMMPricer"  ./AMMPricer.o ./LatticeClass.o ./TrinomialTree.o   
/usr/bin/ld: Undefined symbols:
vtable for CLatticeNode
collect2: ld returned 1 exit status
make: *** [AMMPricer] Error 1

Is this a linker error or have I got something wrong in the class definition?

modified on Wednesday, January 23, 2008 3:57:49 PM

Maximilien23-Jan-08 10:31

Maximilien

23-Jan-08 10:31

73Zeppelin wrote:
Tree[col].push_back(CLatticeNodePtr(new CLatticeNode((Tree[col-1][row])->GetUnderlyingPrice() * m_dU)));

If you spit those line, will that work ? or does that give you some other error/warnings ?

can you test your code with Visual Studio compiler ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

⁷³Zeppelin23-Jan-08 10:39

23-Jan-08 10:39

Yes, I've tried splitting them and I get the same problem. This code is in a unix environment - I don't have the ability (or the time) to port it to VS. The vtable problem is usually a linker error, but I suspect there's something wrong with the class definition. I can't see what it is though.

Jim Crafton23-Jan-08 12:02

Jim Crafton

23-Jan-08 12:02

73Zeppelin wrote:
g++

There's your problem Smile | :)

Seriously, have you tried this without using the boost shared ptr? If that works then maybe it's the way you're using the smart pointer? I would try and break up that single line statement into *all* it's component parts and see if there's something weird going on there.

One other thought - do you implement the default constructor? You don't have any impl here, maybe that's the problem?

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⁷³Zeppelin23-Jan-08 19:26

23-Jan-08 19:26

Jim Crafton wrote:
There's your problem

I know, g++ is not the most stress-free compiler...

Jim Crafton wrote:
Seriously, have you tried this without using the boost shared ptr? If that works then maybe it's the way you're using the smart pointer? I would try and break up that single line statement into *all* it's component parts and see if there's something weird going on there.

I have tried breaking it up into a million little pieces, but I consistently get the vtable error. That's why I called this thread "VTable Madness". It's driving me insane.

Jim Crafton wrote:
One other thought - do you implement the default constructor? You don't have any impl here, maybe that's the problem?

Hmmmmm, it should be in there. If not, I've done it like this in the .h file:

CLatticeNode(void) {;};

Solution!

⁷³Zeppelin23-Jan-08 20:03

23-Jan-08 20:03

Jim Crafton wrote:
There's your problem

Seriously, have you tried this without using the boost shared ptr? If that works then maybe it's the way you're using the smart pointer? I would try and break up that single line statement into *all* it's component parts and see if there's something weird going on there.

One other thought - do you implement the default constructor? You don't have any impl here, maybe that's the problem?

Found it! Not the CONSTRUCTOR, but the virtual DESTRUCTOR wasn't implemented. Gah!

Re: Solution!

Rajesh R Subramanian23-Jan-08 22:24

Rajesh R Subramanian

23-Jan-08 22:24

73Zeppelin wrote:
Found it! Not the CONSTRUCTOR, but the virtual DESTRUCTOR wasn't implemented. Gah!

Sometimes we spend days together to hunt down a complex problem and finally it boils down to something like this. Smile | :)

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.·´¯`·->Rajesh<-·´¯`·.
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Re: Solution!

Jim Crafton24-Jan-08 3:23

Jim Crafton

24-Jan-08 3:23

Awesome! I think I've seen a similar kind of error with VC 6, only it's occurs in the compile phase as opposed to the linking phase.

Re: Solution!

⁷³Zeppelin24-Jan-08 3:39

c/c++ binary to string and vice versa conversion functions?

24-Jan-08 3:39

Yeah, truly annoying. THanks for the push in the right direction.

mindspin31123-Jan-08 5:02

mindspin311

23-Jan-08 5:02

I'm having trouble finding a c or c++ function that will convert a string of 1's and 0's to a string of characters. I also need something that will do the opposite. I was just wondering if there is a class out there that will handle this. I really don't feel like writing my own, if I can find one that will do it for me.

Re: c/c++ binary to string and vice versa conversion functions?

David Crow23-Jan-08 5:26

Re: c/c++ binary to string and vice versa conversion functions?

23-Jan-08 5:26

mindspin311 wrote:
I'm having trouble finding a c or c++ function that will convert a string of 1's and 0's to a string of characters.

Assuming you meant to its numeric equivalent, check out strtol().

mindspin311 wrote:
I really don't feel like writing my own, if I can find one that will do it for me.

There are plenty available (e.g., CP, Google), but writing your own will take all of five minutes. You'll spend more time than that searching (and then implementing).

CPallini23-Jan-08 5:32

CPallini

23-Jan-08 5:32

DavidCrow wrote:
but writing your own will take all of five minutes

Sure?

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Re: c/c++ binary to string and vice versa conversion functions?

David Crow23-Jan-08 5:40

23-Jan-08 5:40

Ok, four minutes if you don't do any simultaneous browsing or game-playing.

OK!

CPallini23-Jan-08 5:52

CPallini

23-Jan-08 5:52

OK, I promise to do no browsing nor game-playing (until the four minutes timeout expiration) while waiting him to complete the job.
Big Grin | :-D

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View Console Window

gman200823-Jan-08 3:17

gman2008

23-Jan-08 3:17

Hi i'm wondering if the console could be viewed in windows forms?

I'm not sure what the line would be to view the console.

Sorry to post this on this forum but the is best forum in terms c++ help.

David Crow23-Jan-08 3:37

23-Jan-08 3:37

Are you wanting to spawn, and view the output of, a console application from your code?

gman200823-Jan-08 3:40

gman2008

23-Jan-08 3:40

I have code that writes to a console but I can't see the console because it is a windows forms application i'm writing

David Crow23-Jan-08 4:30

23-Jan-08 4:30

I'm confused. If you are already writing to the console window, can't you just write the same text to some other location (e.g., a form)?

gman200823-Jan-08 4:44

gman2008

23-Jan-08 4:44

The code that writes to the console is to connect to a server and I don't want that to be shown on the form for the user to see but in the background in a console. It connects to the server fine but just doesn't display in a console window.

David Crow23-Jan-08 5:03