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Members variables are destroyed when outof scope

Whenever some data was received into Gryphon, the OnRx() function got triggered.
In OnRx() the CTestappDlg member function ReceiveData() is called.
In ReceivedData(), the pointer ‘mygryphon’ (dgGryphon * mygryphon) becomes null.
As an alternative, declared the pointer (mygryphon ) as global and tried accessing
the member functions. Even doing so did not help.

Please suggest.

//Connect to the Gryphon
void CTestappDlg::OnGryconnect()          //Connecting to the Gryphon.....
{
     
     bool result = m_mygryphon->BeginSession( (dgString) m_ip1 );
     if(!result)
     {
          m_mygryphon->GetLastOpStatus( &m_errnum, &m_errstr );
          m_text.Format( "BeginSession()...Error: %s", m_errstr.c_str() );
                     m_output.AddString(m_text);
          return;
     }
     else
                  m_output.AddString("BeginSession()...OK");

     if(!SetOnRx(OnRx, FT_DATA, 0))
     {
          m_text.Format("SetOnRx()... Error:%s", m_errstr.c_str());
          m_output.AddString(m_text);
     }
}

void OnRx()
{
     CTestappDlg::ReceiveData();
}

void CTestappDlg::ReceiveData()
{
     if( !m_mygryphon->RecvFrame( &dataframe, my_channel[i] ) )
     {
          m_mygryphon->GetLastOpStatus( &m_errnum, &m_errstr );
          m_text.Format( "RecvFrame()... Error: %s", m_errstr.c_str() );
                  m_output.AddString(m_text);
          return;
     }
     else
     m_output.AddString( "RecvFrame()... OK" );
}

Thank you !
0
l_angelo
Asked:
l_angelo
1 Solution
 
l_angeloAuthor Commented:
Its urgent !
0
 
chensuCommented:
Set a data breakpoint when m_mygryphon is equal to 0.
0
 
Vinayak KumbarSr Program ManagerCommented:
Hi angelo,

I need to know some details of what u r doing so that I can give u the solution.

1. What version of Gryphon library u r using?
2. Who is calling ur OnRx() function?
3. Have U written any embedded client application to do that?
4. Just have a peristant dialog pointer to ur main dialog, say in app class and try accessing the ReceiveData function using that pointer. i,e.., in app's .h file declare CTestappDlg *m_pDlg; Then in OnInitDialog,
CTestappDlg *pApp = (CTestappDlg *)AfxgetApp();
pApp->m_pDlg = this;
Then in ur OnRx function

void OnRx()
{
CTestappDlg *pApp = (CTestappDlg *)AfxgetApp();
pApp->m_pDlg->ReceiveData();
}

Then try it.

If possible u can send me that sample to k_bbb100@hotmail.com. I have the Gryphon and relevant software with me, so that I can debug it for U.

Try it out.
VinExpert
0
 
lil_elvis2000Commented:
Use the debugger and break when value of m_mygryphon changes as is being suggested.

This can be done after debugger starts..at location where m_mygryphon is created..set a breakpoint, step over. then in breakpoints dialog (Edit | Breakpoints...) click on data tab and enter m_mygryphon, click okay.

in my experience you need to do it this way. or C++ seems to disable the breakpoint.

good luck.
0
 
l_angeloAuthor Commented:
Thanks VinExpert !

Probably this should work for me.....
0
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