FW:

Hi All, 
I want to add some more findings to my previous question.

By making the functions non-virtual I am able to solve my problem successfully,
but I do not intend to be doing that, as I will loose the advantage of having 
them.

If any c++ expert can help me on this, I really appreciate for there help.

Thank you

> -----Original Message-----
> From: Devender Marri 
> Sent: Thursday, May 20, 2004 1:36 PM
> To:   'swig@xxxxxxxxxxxxxxx'
> Subject:      
> 
> Hi All,
> 
> Sorry my previous description was not clear, so adding more description.
> 
> Issue: Memory corruption.
> 
> Operating System - Linux
> JDK - 1.4.2
> gcc - 3.0
> 
> I had an header file of the format
> 
> class DtInteraction :: public DtBaseInteraction
> { 
>       public:
>           virtual void setRequestId(int id);
>           virtual int requestId() const;
>       protected:
>           int myRequestId;
> }
> 
> class DtBaseInteraction
> {
>      virtual void setNum(int newNum);
>      virtual int getNum() const;
>     protected: 
>        int myNum;
> }
> 
> I do not have implementation for the above classes, but I assume the 
> implementation should be straight forward.
> I have  the library file libImpl.so which allows me to access the above 
> methods.
> 
> I used swig to generate the wrapper classes for the above.
> 
> I create a test java class as shown below
> {
> .
> .
>    DtInteraction test = new DtInteraction();
>    test.setRequestId(100);
>    System.out.println("RequestId value is " + test.getRequestId());
> 
>    test.setNum(101);
>    System.out.println("my number is " + test.getNum());
> }
>  
> The output of the above test is as follows
> RequestIdValue is 144322456
> my number is 101
> 
> 
> My comments
> 1) The value returned by getRequestId is not the same as the value. It is 
> equal to the value of test.getCptr() or the address of the c++ object.
> 2) Was able to successfully receive the base class value.
> 
> I had written a c++ program to ensure that setRequestId is indeed setting the 
> correct values.
> 
> test cpp class is as follows
> {
>       DtInteraction* test = new DtInteraction();
>       test->setRequestId(100);
>       cout << "request id value is " << test->getRequestId() << endl
> }
> 
> The output of the above implementation is 
> request id value is 100
> 
> 
> My Comments:
> From the above test I found the library which I am using for java testing is 
> indeed correct.
> 
> 
> 
> Conclusion:
> I know that It looks pretty strange, but I face this problem,
> I had my own set, get methods to the header file and generated the wrapper 
> and java classes and tested 
> and found that those does not have any problem.
> 
> Example:
> class DtInteraction :: public DtBaseInteraction
> { 
>       public:
> .
> .
>      virtual void setMyNum(int num)
>     {
>         myNum = num;
>     }
>    virutal int getMyNum() const
>    {
>        return myNum
>    }
>  }
> 
> The above method returns correct value when accessed from java.
> 
> U are always welcome to demand more information from me.
> 
> I really appreciate if some body can help me.
> 
> Thank you.
> 
> 
> 
> 
> 
> 
> 
> 
> Regards
> Marri Devender Rao
> Software Engineer
> 24, Ang Mo Kio Street 65,
> Singapore 569061
> Phone: 64131381(O), 65833061(H)
> 
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