hello,
        I am reading a file in chunks of 512 bytes(i am reading 2 such 
blocks).I am calling SetTimer function.And in corresponding OnTimer function 
I am writing code for displaying the file data on a  graph control placed in 
my dialog box.I am calling the KillTimer function after the 2 chunks of data 
are displayed as graphs.
But when i close the dialog or press OK/Cancel button the dialog MFC 
application error box appears which asks "whether to send the error report to 
microsoft".Why is this coming?First i thought maybe the KillTimer function 
isnt properly called but that is not the case since when i debugged the 
program i got the result that Killtimer is properly called.
     Its after i close the .EXE or press OK to close the dialog then the MFC 
error box appears.

please please help fast..
p.s.-as i degugged the program an unexpected exception  occurs after i press 
OK or Close button

 

sayu wrote:
> please please help fast..
> p.s.-as i degugged the program an unexpected exception  occurs after i press 
> OK or Close button

You should track the bug starting from this exception. The debugger will 
stop the execution on the place where this exception occurred, exactly 
on the instruction that cannot be executed. If you can't find the bug 
post here several lines before and after the code that's causing the 
exception.

sayu wrote:
> hello,
>         I am reading a file in chunks of 512 bytes(i am reading 2 such
> blocks).I am calling SetTimer function.And in corresponding OnTimer function
> I am writing code for displaying the file data on a  graph control placed in
> my dialog box.I am calling the KillTimer function after the 2 chunks of data
> are displayed as graphs.
> But when i close the dialog or press OK/Cancel button the dialog MFC
> application error box appears which asks "whether to send the error report to
> microsoft".Why is this coming?First i thought maybe the KillTimer function
> isnt properly called but that is not the case since when i debugged the
> program i got the result that Killtimer is properly called.
>      Its after i close the .EXE or press OK to close the dialog then the MFC
> error box appears.
>
> please please help fast..
> p.s.-as i degugged the program an unexpected exception  occurs after i press
> OK or Close button

The timer functions are unlikely to be the cause of your problem. Most
likely you have a bug somewhere else in your program. Try posting a
minimal example that reproduces the behaviour (the key here is minimal
- for one you may spot the problem yourself, if not the smaller the
better to be easily digestible by others who may be able to help).

Regards,

Hugh

This is my OnTimer() code 
CDialogDlg::OnTimer()
{
UpdateData(TRUE);

    var_x=0;
    static int i=0;
    static int j=512;

    m_ctrl.ClearGraph();//each time before plotting graph earlier graph on 
screen   erased//

    for(;i<j;i++)
  {
		
	     m_ctrl.SetElementLineColor(2000);	
	     m_ctrl.PlotXY(var_x,(double)buff[i],0);//plotting 512 bytes of data
	     var_x=var_x+(46.875/1000);
	
    }
	j=j+512;//increment j so that in next SetTimer loopnext chunk of 512 bytes 
plotted;i.e.from 512-1023bytes//

    if(j>1024)
	{
	  r=KillTimer(s);//If 1024 chunks are plotted i Wish to end call to 
SetTimer;hence calling KillTimer()//
	}
	UpdateData(FALSE);

}
 
I degugged the program by palcing breakpoint on KillTimer function.Both the 
graphs are plotted successfully an dthen plotting stops(that means KillTimer 
is called).Now as i press OK/CANCEL/Close button to close the dialog it gives 
message that unhandled exception occcured in dialog.exe

please help

"Mihajlo Cvetanović" wrote:

> sayu wrote:
> > please please help fast..
> > p.s.-as i degugged the program an unexpected exception  occurs after i press 
> > OK or Close button
> 
> You should track the bug starting from this exception. The debugger will 
> stop the execution on the place where this exception occurred, exactly 
> on the instruction that cannot be executed. If you can't find the bug 
> post here several lines before and after the code that's causing the 
> exception.
> 

sayu wrote:
> This is my OnTimer() code
> CDialogDlg::OnTimer()
> {
> UpdateData(TRUE);
>
>     var_x=0;
>     static int i=0;
>     static int j=512;
>
>     m_ctrl.ClearGraph();//each time before plotting graph earlier graph on
> screen   erased//
>
>     for(;i<j;i++)
>   {
>
> 	     m_ctrl.SetElementLineColor(2000);
> 	     m_ctrl.PlotXY(var_x,(double)buff[i],0);//plotting 512 bytes of data
> 	     var_x=var_x+(46.875/1000);
>
>     }
> 	j=j+512;//increment j so that in next SetTimer loopnext chunk of 512 bytes
> plotted;i.e.from 512-1023bytes//
>
>     if(j>1024)
> 	{
> 	  r=KillTimer(s);//If 1024 chunks are plotted i Wish to end call to
> SetTimer;hence calling KillTimer()//
> 	}
> 	UpdateData(FALSE);
>
> }
>
> I degugged the program by palcing breakpoint on KillTimer function.Both the
> graphs are plotted successfully an dthen plotting stops(that means KillTimer
> is called).Now as i press OK/CANCEL/Close button to close the dialog it gives
> message that unhandled exception occcured in dialog.exe
>
> please help
>
> "Mihajlo Cvetanovic" wrote:
>
> > sayu wrote:
> > > please please help fast..
> > > p.s.-as i degugged the program an unexpected exception  occurs after i press
> > > OK or Close button
> >
> > You should track the bug starting from this exception. The debugger will
> > stop the execution on the place where this exception occurred, exactly
> > on the instruction that cannot be executed. If you can't find the bug
> > post here several lines before and after the code that's causing the
> > exception.
> >

One quick point - try not to use UpdateData the way you are, instead
use control variables and SetWindowText, GetWindowText etc.

In terms of the error you're encountering I can't see anything that
would cause this and so the advice in my first reply still stands -
start cutting out bits of code until you get a minimal example that
reproduces this bug then if you still can't solve it yourself post it
here. For example, what happens if you comment out all of the timer
stuff completely? 

Regards,

Hugh

There's not enough information to reach a conclusion (especially: where 
did exception occurred). Maybe answers to these questions may help.

What is the size of buff array?

Will the exception occur even if you don't set the timer?

Shouldn't if(j>1024) be actually if(j>=1024) to kill the timer?

Can you enter the code where the exception occurs?

Well first thing is the positon of KillTimer function ok in the code?

Results seen on debugging( I am giving u actual steps f what happened)-
1)If breakpoint at SetTimer() function

As I press F5,first and second graph appear as per time in SetTimer 
function. Dialog waits for user to press key. As I press OK/Cancel message of 
“unhandled Exception” is shown execution control goes to 
CWnd::DestroyWindow() function.
I am showing here some lines in the function:-
#ifdef _AFX_NO_OCC_SUPPORT
	BOOL bResult = ::DestroyWindow(m_hWnd);
#else //_AFX_NO_OCC_SUPPORT
	BOOL bResult;
	if (m_pCtrlSite == NULL)
		bResult = ::DestroyWindow(m_hWnd);
	else
		bResult = m_pCtrlSite->DestroyControl();  //execution stops at this point//
#endif //_AFX_NO_OCC_SUPPORT

	// Note that 'this' may have been deleted at this point,
	//  (but only if pWnd != NULL)
	if (pWnd != NULL)
	{
		// Should have been detached by OnNcDestroy
#ifdef _DEBUG
		ASSERT(pMap->LookupPermanent(hWndOrig) == NULL);
#endif
	}
	else
	{
#ifdef _DEBUG
		ASSERT(m_hWnd == hWndOrig);
#endif
		// Detach after DestroyWindow called just in case
		Detach();
	}
	return bResult;
 
2)If breakpoint  is set at KillTimer() function

As I press F5 first graph appears in dialog and then the dialog 
disappeares.Again I press F5 ,this time second graph appears on dialog and 
dialog box waits for key to be pressed..As I press OK/Cancel same error of 
unhandled exception occurs and control again goes to Cwnd::DestroyWindow() 
function as given in above code.Execution also stops as same point above

Please help













"hughgray@hotmail.co.uk" wrote:

> sayu wrote:
> > hello,
> >         I am reading a file in chunks of 512 bytes(i am reading 2 such
> > blocks).I am calling SetTimer function.And in corresponding OnTimer function
> > I am writing code for displaying the file data on a  graph control placed in
> > my dialog box.I am calling the KillTimer function after the 2 chunks of data
> > are displayed as graphs.
> > But when i close the dialog or press OK/Cancel button the dialog MFC
> > application error box appears which asks "whether to send the error report to
> > microsoft".Why is this coming?First i thought maybe the KillTimer function
> > isnt properly called but that is not the case since when i debugged the
> > program i got the result that Killtimer is properly called.
> >      Its after i close the .EXE or press OK to close the dialog then the MFC
> > error box appears.
> >
> > please please help fast..
> > p.s.-as i degugged the program an unexpected exception  occurs after i press
> > OK or Close button
> 
> The timer functions are unlikely to be the cause of your problem. Most
> likely you have a bug somewhere else in your program. Try posting a
> minimal example that reproduces the behaviour (the key here is minimal
> - for one you may spot the problem yourself, if not the smaller the
> better to be easily digestible by others who may be able to help).
> 
> Regards,
> 
> Hugh
> 
> 

my answers to Mihajlo's questions:

1)Size of buff array is 1024 since i am storing 1024 bytes of data.
2)when i displayed 1 set of data(512 bytes) in OnInitdialog() function(not 
using SetTimer  and Ontimer) then there is no problem.so logic is ok
3)no,i think j>1024 is ok coz after i display first graph i increment j by 
512 which makes j=1024;so if we putj>=1024 then KillTimer will be called 
before second graph display 
  Please see my code.It outputs the graph successfully.I am only having 
problem in closing application provided in my second message 
I am also now giving the exception code

"hughgray@hotmail.co.uk" wrote:

> sayu wrote:
> > hello,
> >         I am reading a file in chunks of 512 bytes(i am reading 2 such
> > blocks).I am calling SetTimer function.And in corresponding OnTimer function
> > I am writing code for displaying the file data on a  graph control placed in
> > my dialog box.I am calling the KillTimer function after the 2 chunks of data
> > are displayed as graphs.
> > But when i close the dialog or press OK/Cancel button the dialog MFC
> > application error box appears which asks "whether to send the error report to
> > microsoft".Why is this coming?First i thought maybe the KillTimer function
> > isnt properly called but that is not the case since when i debugged the
> > program i got the result that Killtimer is properly called.
> >      Its after i close the .EXE or press OK to close the dialog then the MFC
> > error box appears.
> >
> > please please help fast..
> > p.s.-as i degugged the program an unexpected exception  occurs after i press
> > OK or Close button
> 
> The timer functions are unlikely to be the cause of your problem. Most
> likely you have a bug somewhere else in your program. Try posting a
> minimal example that reproduces the behaviour (the key here is minimal
> - for one you may spot the problem yourself, if not the smaller the
> better to be easily digestible by others who may be able to help).
> 
> Regards,
> 
> Hugh
> 
> 

sayu wrote:
> Well first thing is the positon of KillTimer function ok in the code?
>
> Results seen on debugging( I am giving u actual steps f what happened)-
> 1)If breakpoint at SetTimer() function
>
> As I press F5,first and second graph appear as per time in SetTimer
> function. Dialog waits for user to press key. As I press OK/Cancel message of
> "unhandled Exception" is shown execution control goes to
> CWnd::DestroyWindow() function.
> I am showing here some lines in the function:-
> #ifdef _AFX_NO_OCC_SUPPORT
> 	BOOL bResult = ::DestroyWindow(m_hWnd);
> #else //_AFX_NO_OCC_SUPPORT
> 	BOOL bResult;
> 	if (m_pCtrlSite == NULL)
> 		bResult = ::DestroyWindow(m_hWnd);
> 	else
> 		bResult = m_pCtrlSite->DestroyControl();  //execution stops at this point//
> #endif //_AFX_NO_OCC_SUPPORT
>
> 	// Note that 'this' may have been deleted at this point,
> 	//  (but only if pWnd != NULL)
> 	if (pWnd != NULL)
> 	{
> 		// Should have been detached by OnNcDestroy
> #ifdef _DEBUG
> 		ASSERT(pMap->LookupPermanent(hWndOrig) == NULL);
> #endif
> 	}
> 	else
> 	{
> #ifdef _DEBUG
> 		ASSERT(m_hWnd == hWndOrig);
> #endif
> 		// Detach after DestroyWindow called just in case
> 		Detach();
> 	}
> 	return bResult;
>
> 2)If breakpoint  is set at KillTimer() function
>
> As I press F5 first graph appears in dialog and then the dialog
> disappeares.Again I press F5 ,this time second graph appears on dialog and
> dialog box waits for key to be pressed..As I press OK/Cancel same error of
> unhandled exception occurs and control again goes to Cwnd::DestroyWindow()
> function as given in above code.Execution also stops as same point above
>
> Please help
>
>
>
>
>
>
>
>
>
>
>
>
>
> "hughgray@hotmail.co.uk" wrote:
>
> > sayu wrote:
> > > hello,
> > >         I am reading a file in chunks of 512 bytes(i am reading 2 such
> > > blocks).I am calling SetTimer function.And in corresponding OnTimer function
> > > I am writing code for displaying the file data on a  graph control placed in
> > > my dialog box.I am calling the KillTimer function after the 2 chunks of data
> > > are displayed as graphs.
> > > But when i close the dialog or press OK/Cancel button the dialog MFC
> > > application error box appears which asks "whether to send the error report to
> > > microsoft".Why is this coming?First i thought maybe the KillTimer function
> > > isnt properly called but that is not the case since when i debugged the
> > > program i got the result that Killtimer is properly called.
> > >      Its after i close the .EXE or press OK to close the dialog then the MFC
> > > error box appears.
> > >
> > > please please help fast..
> > > p.s.-as i degugged the program an unexpected exception  occurs after i press
> > > OK or Close button
> >
> > The timer functions are unlikely to be the cause of your problem. Most
> > likely you have a bug somewhere else in your program. Try posting a
> > minimal example that reproduces the behaviour (the key here is minimal
> > - for one you may spot the problem yourself, if not the smaller the
> > better to be easily digestible by others who may be able to help).
> >
> > Regards,
> >
> > Hugh
> >
> >

It's still difficult to try and determine what the problem is. However,
you say that execution stops on -

m_pCtrlSite->DestroyControl()

- which may indicate that the problem is related to the ActiveX
graphing control you are using. I would suggest creating a new empty
project and then insert this control onto the main dialog. Run the
project and make sure there's no crash. Then add in small bits of
functionality to clear the graph, display a little data etc. Make sure
there's no crash. It could be that you have to call some kind of
cleanup function on the graph before closing the dialog. Again, there
is not enough information to be sure here.

It might also be worth a check over the documentation for the control
just to make sure you haven't missed anything else.

Is it a well known graphing control you are using? Are there any
support resources available for it? If so you could try that avenue as
well.

Hugh

sayu wrote:
> 2)when i displayed 1 set of data(512 bytes) in OnInitdialog() function(not 
> using SetTimer  and Ontimer) then there is no problem.so logic is ok

What happens if you display both sets in OnInitDialog?
What happens if you display only one set in OnTimer?
When exception occurs what are the values of "this" and m_pCtrlSite?
Maybe CWnd::DestroyWindow is somehow called twice...

I am using NTGraph control which i have downloaded from website 
codeproject.com.there is not much document available for it.And at first i 
was displaying a chunk of data(512 bytes) in OnInitDialog() without using 
SetTimer and Ontimer functions().That was working fine and application was 
closing without error.Only after i want to display more than one sets of data 
in OnTimer the problem occurs.
I am also giving you the link to code for u to see(from where i downloaded)
LINK-  http://www.codeproject.com/miscctrl/ntgraph_activex.asp

"hughgray@hotmail.co.uk" wrote:

> sayu wrote:
> > Well first thing is the positon of KillTimer function ok in the code?
> >
> > Results seen on debugging( I am giving u actual steps f what happened)-
> > 1)If breakpoint at SetTimer() function
> >
> > As I press F5,first and second graph appear as per time in SetTimer
> > function. Dialog waits for user to press key. As I press OK/Cancel message of
> > "unhandled Exception" is shown execution control goes to
> > CWnd::DestroyWindow() function.
> > I am showing here some lines in the function:-
> > #ifdef _AFX_NO_OCC_SUPPORT
> > 	BOOL bResult = ::DestroyWindow(m_hWnd);
> > #else //_AFX_NO_OCC_SUPPORT
> > 	BOOL bResult;
> > 	if (m_pCtrlSite == NULL)
> > 		bResult = ::DestroyWindow(m_hWnd);
> > 	else
> > 		bResult = m_pCtrlSite->DestroyControl();  //execution stops at this point//
> > #endif //_AFX_NO_OCC_SUPPORT
> >
> > 	// Note that 'this' may have been deleted at this point,
> > 	//  (but only if pWnd != NULL)
> > 	if (pWnd != NULL)
> > 	{
> > 		// Should have been detached by OnNcDestroy
> > #ifdef _DEBUG
> > 		ASSERT(pMap->LookupPermanent(hWndOrig) == NULL);
> > #endif
> > 	}
> > 	else
> > 	{
> > #ifdef _DEBUG
> > 		ASSERT(m_hWnd == hWndOrig);
> > #endif
> > 		// Detach after DestroyWindow called just in case
> > 		Detach();
> > 	}
> > 	return bResult;
> >
> > 2)If breakpoint  is set at KillTimer() function
> >
> > As I press F5 first graph appears in dialog and then the dialog
> > disappeares.Again I press F5 ,this time second graph appears on dialog and
> > dialog box waits for key to be pressed..As I press OK/Cancel same error of
> > unhandled exception occurs and control again goes to Cwnd::DestroyWindow()
> > function as given in above code.Execution also stops as same point above
> >
> > Please help
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > "hughgray@hotmail.co.uk" wrote:
> >
> > > sayu wrote:
> > > > hello,
> > > >         I am reading a file in chunks of 512 bytes(i am reading 2 such
> > > > blocks).I am calling SetTimer function.And in corresponding OnTimer function
> > > > I am writing code for displaying the file data on a  graph control placed in
> > > > my dialog box.I am calling the KillTimer function after the 2 chunks of data
> > > > are displayed as graphs.
> > > > But when i close the dialog or press OK/Cancel button the dialog MFC
> > > > application error box appears which asks "whether to send the error report to
> > > > microsoft".Why is this coming?First i thought maybe the KillTimer function
> > > > isnt properly called but that is not the case since when i debugged the
> > > > program i got the result that Killtimer is properly called.
> > > >      Its after i close the .EXE or press OK to close the dialog then the MFC
> > > > error box appears.
> > > >
> > > > please please help fast..
> > > > p.s.-as i degugged the program an unexpected exception  occurs after i press
> > > > OK or Close button
> > >
> > > The timer functions are unlikely to be the cause of your problem. Most
> > > likely you have a bug somewhere else in your program. Try posting a
> > > minimal example that reproduces the behaviour (the key here is minimal
> > > - for one you may spot the problem yourself, if not the smaller the
> > > better to be easily digestible by others who may be able to help).
> > >
> > > Regards,
> > >
> > > Hugh
> > >
> > >
> 
> It's still difficult to try and determine what the problem is. However,
> you say that execution stops on -
> 
> m_pCtrlSite->DestroyControl()
> 
> - which may indicate that the problem is related to the ActiveX
> graphing control you are using. I would suggest creating a new empty
> project and then insert this control onto the main dialog. Run the
> project and make sure there's no crash. Then add in small bits of
> functionality to clear the graph, display a little data etc. Make sure
> there's no crash. It could be that you have to call some kind of
> cleanup function on the graph before closing the dialog. Again, there
> is not enough information to be sure here.
> 
> It might also be worth a check over the documentation for the control
> just to make sure you haven't missed anything else.
> 
> Is it a well known graphing control you are using? Are there any
> support resources available for it? If so you could try that avenue as
> well.
> 
> Hugh
> 
> 

sayu wrote:
> I am using NTGraph control which i have downloaded from website
> codeproject.com.there is not much document available for it.And at first i
> was displaying a chunk of data(512 bytes) in OnInitDialog() without using
> SetTimer and Ontimer functions().That was working fine and application was
> closing without error.Only after i want to display more than one sets of data
> in OnTimer the problem occurs.
> I am also giving you the link to code for u to see(from where i downloaded)
> LINK-  http://www.codeproject.com/miscctrl/ntgraph_activex.asp
>
> "hughgray@hotmail.co.uk" wrote:
>
> > sayu wrote:
> > > Well first thing is the positon of KillTimer function ok in the code?
> > >
> > > Results seen on debugging( I am giving u actual steps f what happened)-
> > > 1)If breakpoint at SetTimer() function
> > >
> > > As I press F5,first and second graph appear as per time in SetTimer
> > > function. Dialog waits for user to press key. As I press OK/Cancel message of
> > > "unhandled Exception" is shown execution control goes to
> > > CWnd::DestroyWindow() function.
> > > I am showing here some lines in the function:-
> > > #ifdef _AFX_NO_OCC_SUPPORT
> > > 	BOOL bResult = ::DestroyWindow(m_hWnd);
> > > #else //_AFX_NO_OCC_SUPPORT
> > > 	BOOL bResult;
> > > 	if (m_pCtrlSite == NULL)
> > > 		bResult = ::DestroyWindow(m_hWnd);
> > > 	else
> > > 		bResult = m_pCtrlSite->DestroyControl();  //execution stops at this point//
> > > #endif //_AFX_NO_OCC_SUPPORT
> > >
> > > 	// Note that 'this' may have been deleted at this point,
> > > 	//  (but only if pWnd != NULL)
> > > 	if (pWnd != NULL)
> > > 	{
> > > 		// Should have been detached by OnNcDestroy
> > > #ifdef _DEBUG
> > > 		ASSERT(pMap->LookupPermanent(hWndOrig) == NULL);
> > > #endif
> > > 	}
> > > 	else
> > > 	{
> > > #ifdef _DEBUG
> > > 		ASSERT(m_hWnd == hWndOrig);
> > > #endif
> > > 		// Detach after DestroyWindow called just in case
> > > 		Detach();
> > > 	}
> > > 	return bResult;
> > >
> > > 2)If breakpoint  is set at KillTimer() function
> > >
> > > As I press F5 first graph appears in dialog and then the dialog
> > > disappeares.Again I press F5 ,this time second graph appears on dialog and
> > > dialog box waits for key to be pressed..As I press OK/Cancel same error of
> > > unhandled exception occurs and control again goes to Cwnd::DestroyWindow()
> > > function as given in above code.Execution also stops as same point above
> > >
> > > Please help
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > "hughgray@hotmail.co.uk" wrote:
> > >
> > > > sayu wrote:
> > > > > hello,
> > > > >         I am reading a file in chunks of 512 bytes(i am reading 2 such
> > > > > blocks).I am calling SetTimer function.And in corresponding OnTimer function
> > > > > I am writing code for displaying the file data on a  graph control placed in
> > > > > my dialog box.I am calling the KillTimer function after the 2 chunks of data
> > > > > are displayed as graphs.
> > > > > But when i close the dialog or press OK/Cancel button the dialog MFC
> > > > > application error box appears which asks "whether to send the error report to
> > > > > microsoft".Why is this coming?First i thought maybe the KillTimer function
> > > > > isnt properly called but that is not the case since when i debugged the
> > > > > program i got the result that Killtimer is properly called.
> > > > >      Its after i close the .EXE or press OK to close the dialog then the MFC
> > > > > error box appears.
> > > > >
> > > > > please please help fast..
> > > > > p.s.-as i degugged the program an unexpected exception  occurs after i press
> > > > > OK or Close button
> > > >
> > > > The timer functions are unlikely to be the cause of your problem. Most
> > > > likely you have a bug somewhere else in your program. Try posting a
> > > > minimal example that reproduces the behaviour (the key here is minimal
> > > > - for one you may spot the problem yourself, if not the smaller the
> > > > better to be easily digestible by others who may be able to help).
> > > >
> > > > Regards,
> > > >
> > > > Hugh
> > > >
> > > >
> >
> > It's still difficult to try and determine what the problem is. However,
> > you say that execution stops on -
> >
> > m_pCtrlSite->DestroyControl()
> >
> > - which may indicate that the problem is related to the ActiveX
> > graphing control you are using. I would suggest creating a new empty
> > project and then insert this control onto the main dialog. Run the
> > project and make sure there's no crash. Then add in small bits of
> > functionality to clear the graph, display a little data etc. Make sure
> > there's no crash. It could be that you have to call some kind of
> > cleanup function on the graph before closing the dialog. Again, there
> > is not enough information to be sure here.
> >
> > It might also be worth a check over the documentation for the control
> > just to make sure you haven't missed anything else.
> >
> > Is it a well known graphing control you are using? Are there any
> > support resources available for it? If so you could try that avenue as
> > well.
> >
> > Hugh
> >
> >

Well I can't vouch for this control but I'll take a look at it when I
get some time. Chances are that the problem could be somewhere else in
your code anyway. I would keep experimenting with removing bits of your
code to see if you can narrow things down.

Regards,

Hugh

hughgray@hotmail.co.uk wrote:
> sayu wrote:
> > I am using NTGraph control which i have downloaded from website
> > codeproject.com.there is not much document available for it.And at first i
> > was displaying a chunk of data(512 bytes) in OnInitDialog() without using
> > SetTimer and Ontimer functions().That was working fine and application was
> > closing without error.Only after i want to display more than one sets of data
> > in OnTimer the problem occurs.
> > I am also giving you the link to code for u to see(from where i downloaded)
> > LINK-  http://www.codeproject.com/miscctrl/ntgraph_activex.asp
> >
> > "hughgray@hotmail.co.uk" wrote:
> >
> > > sayu wrote:
> > > > Well first thing is the positon of KillTimer function ok in the code?
> > > >
> > > > Results seen on debugging( I am giving u actual steps f what happened)-
> > > > 1)If breakpoint at SetTimer() function
> > > >
> > > > As I press F5,first and second graph appear as per time in SetTimer
> > > > function. Dialog waits for user to press key. As I press OK/Cancel message of
> > > > "unhandled Exception" is shown execution control goes to
> > > > CWnd::DestroyWindow() function.
> > > > I am showing here some lines in the function:-
> > > > #ifdef _AFX_NO_OCC_SUPPORT
> > > > 	BOOL bResult = ::DestroyWindow(m_hWnd);
> > > > #else //_AFX_NO_OCC_SUPPORT
> > > > 	BOOL bResult;
> > > > 	if (m_pCtrlSite == NULL)
> > > > 		bResult = ::DestroyWindow(m_hWnd);
> > > > 	else
> > > > 		bResult = m_pCtrlSite->DestroyControl();  //execution stops at this point//
> > > > #endif //_AFX_NO_OCC_SUPPORT
> > > >
> > > > 	// Note that 'this' may have been deleted at this point,
> > > > 	//  (but only if pWnd != NULL)
> > > > 	if (pWnd != NULL)
> > > > 	{
> > > > 		// Should have been detached by OnNcDestroy
> > > > #ifdef _DEBUG
> > > > 		ASSERT(pMap->LookupPermanent(hWndOrig) == NULL);
> > > > #endif
> > > > 	}
> > > > 	else
> > > > 	{
> > > > #ifdef _DEBUG
> > > > 		ASSERT(m_hWnd == hWndOrig);
> > > > #endif
> > > > 		// Detach after DestroyWindow called just in case
> > > > 		Detach();
> > > > 	}
> > > > 	return bResult;
> > > >
> > > > 2)If breakpoint  is set at KillTimer() function
> > > >
> > > > As I press F5 first graph appears in dialog and then the dialog
> > > > disappeares.Again I press F5 ,this time second graph appears on dialog and
> > > > dialog box waits for key to be pressed..As I press OK/Cancel same error of
> > > > unhandled exception occurs and control again goes to Cwnd::DestroyWindow()
> > > > function as given in above code.Execution also stops as same point above
> > > >
> > > > Please help
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > "hughgray@hotmail.co.uk" wrote:
> > > >
> > > > > sayu wrote:
> > > > > > hello,
> > > > > >         I am reading a file in chunks of 512 bytes(i am reading 2 such
> > > > > > blocks).I am calling SetTimer function.And in corresponding OnTimer function
> > > > > > I am writing code for displaying the file data on a  graph control placed in
> > > > > > my dialog box.I am calling the KillTimer function after the 2 chunks of data
> > > > > > are displayed as graphs.
> > > > > > But when i close the dialog or press OK/Cancel button the dialog MFC
> > > > > > application error box appears which asks "whether to send the error report to
> > > > > > microsoft".Why is this coming?First i thought maybe the KillTimer function
> > > > > > isnt properly called but that is not the case since when i debugged the
> > > > > > program i got the result that Killtimer is properly called.
> > > > > >      Its after i close the .EXE or press OK to close the dialog then the MFC
> > > > > > error box appears.
> > > > > >
> > > > > > please please help fast..
> > > > > > p.s.-as i degugged the program an unexpected exception  occurs after i press
> > > > > > OK or Close button
> > > > >
> > > > > The timer functions are unlikely to be the cause of your problem. Most
> > > > > likely you have a bug somewhere else in your program. Try posting a
> > > > > minimal example that reproduces the behaviour (the key here is minimal
> > > > > - for one you may spot the problem yourself, if not the smaller the
> > > > > better to be easily digestible by others who may be able to help).
> > > > >
> > > > > Regards,
> > > > >
> > > > > Hugh
> > > > >
> > > > >
> > >
> > > It's still difficult to try and determine what the problem is. However,
> > > you say that execution stops on -
> > >
> > > m_pCtrlSite->DestroyControl()
> > >
> > > - which may indicate that the problem is related to the ActiveX
> > > graphing control you are using. I would suggest creating a new empty
> > > project and then insert this control onto the main dialog. Run the
> > > project and make sure there's no crash. Then add in small bits of
> > > functionality to clear the graph, display a little data etc. Make sure
> > > there's no crash. It could be that you have to call some kind of
> > > cleanup function on the graph before closing the dialog. Again, there
> > > is not enough information to be sure here.
> > >
> > > It might also be worth a check over the documentation for the control
> > > just to make sure you haven't missed anything else.
> > >
> > > Is it a well known graphing control you are using? Are there any
> > > support resources available for it? If so you could try that avenue as
> > > well.
> > >
> > > Hugh
> > >
> > >
>
> Well I can't vouch for this control but I'll take a look at it when I
> get some time. Chances are that the problem could be somewhere else in
> your code anyway. I would keep experimenting with removing bits of your
> code to see if you can narrow things down.
>
> Regards,
>
> Hugh

Right I've had a quick look at this. I have a simple application
working and I have pasted your OnTimer code in. I have made a couple of
minor modifications to get it to compile on my machine. Here it is -

void CGraphTestDlg::OnTimer(UINT nIDEvent)
{
    UpdateData(TRUE);

    double var_x=0;
    static int i=0;
    static int j=512;

    m_GraphCtrl.ClearGraph();

    for(;i<j;i++)
    {
        m_GraphCtrl.SetElementLineColor(2000);
        m_GraphCtrl.PlotXY(var_x,(double)buff[i],0);
        var_x=var_x+(46.875/1000);
    }
    j=j+512;

    if(j>1024)
    {
        KillTimer(1);
    }

    UpdateData(FALSE);

    CDialog::OnTimer(nIDEvent);
}

I have declared buff as -

double buff[1024];

in the dialog class and initialized every element to 0.2 in
OnInitDialog. I then call SetTimer(1, 1000, NULL). I didn't change any
of the properties of the graph control in the dialog. When executing
all this I get no error when clicking Ok or Cancel. Looks like your
problem is most likely elsewhere in code we haven't seen.

Regards,

Hugh

I am working on your points but it will be of help if you please go through 
the code of the control whenever you have time.I have given the link to the 
control in my earlier message.please tell me if you find some problem in the 
control.
thanks and reply

"Mihajlo Cvetanović" wrote:

> sayu wrote:
> > 2)when i displayed 1 set of data(512 bytes) in OnInitdialog() function(not 
> > using SetTimer  and Ontimer) then there is no problem.so logic is ok
> 
> What happens if you display both sets in OnInitDialog?
> What happens if you display only one set in OnTimer?
> When exception occurs what are the values of "this" and m_pCtrlSite?
> Maybe CWnd::DestroyWindow is somehow called twice...
> 

sayu wrote:
> I am working on your points but it will be of help if you please go through
> the code of the control whenever you have time.I have given the link to the
> control in my earlier message.please tell me if you find some problem in the
> control.
> thanks and reply
>
> "Mihajlo Cvetanovic" wrote:
>
> > sayu wrote:
> > > 2)when i displayed 1 set of data(512 bytes) in OnInitdialog() function(not
> > > using SetTimer  and Ontimer) then there is no problem.so logic is ok
> >
> > What happens if you display both sets in OnInitDialog?
> > What happens if you display only one set in OnTimer?
> > When exception occurs what are the values of "this" and m_pCtrlSite?
> > Maybe CWnd::DestroyWindow is somehow called twice...
> >

I've already done this with no errors. See my other reply. No point in
two of us doing it.

Hugh

sayu wrote:
> I am working on your points but it will be of help if you please go through 
> the code of the control whenever you have time.I have given the link to the 
> control in my earlier message.please tell me if you find some problem in the 
> control.

Because of the rating 4.79 and the fact that the last change was in 
August 2003 (and the fact that the exception occurs in your code) my 
strong belief is that the bug isn't in the control.

hello,
        So r u plotting a graph with y axis values as 0.2.Coz in my code 
buff[1024] stores y axis values read from a file(which i am reading in 
OnInitDialog()).The i plot data from 0 to 511 bytes in array.Incremnts j;so 
that in next SetTimer loop the plot loop works for plotting next 512 values  
and then if j>1024 it calls killtimer().
I am thinking of overloading DestroyWindow() function in my class and call 
killtimer there.I tried but it isnt working.Please ur suggestion on this.....


"hughgray@hotmail.co.uk" wrote:

> sayu wrote:
> > I am working on your points but it will be of help if you please go through
> > the code of the control whenever you have time.I have given the link to the
> > control in my earlier message.please tell me if you find some problem in the
> > control.
> > thanks and reply
> >
> > "Mihajlo Cvetanovic" wrote:
> >
> > > sayu wrote:
> > > > 2)when i displayed 1 set of data(512 bytes) in OnInitdialog() function(not
> > > > using SetTimer  and Ontimer) then there is no problem.so logic is ok
> > >
> > > What happens if you display both sets in OnInitDialog?
> > > What happens if you display only one set in OnTimer?
> > > When exception occurs what are the values of "this" and m_pCtrlSite?
> > > Maybe CWnd::DestroyWindow is somehow called twice...
> > >
> 
> I've already done this with no errors. See my other reply. No point in
> two of us doing it.
> 
> Hugh
> 
> 

sayu wrote:
> hello,
>         So r u plotting a graph with y axis values as 0.2.Coz in my code
> buff[1024] stores y axis values read from a file(which i am reading in
> OnInitDialog()).The i plot data from 0 to 511 bytes in array.Incremnts j;so
> that in next SetTimer loop the plot loop works for plotting next 512 values
> and then if j>1024 it calls killtimer().
> I am thinking of overloading DestroyWindow() function in my class and call
> killtimer there.I tried but it isnt working.Please ur suggestion on this.....
>
>
> "hughgray@hotmail.co.uk" wrote:
>
> > sayu wrote:
> > > I am working on your points but it will be of help if you please go through
> > > the code of the control whenever you have time.I have given the link to the
> > > control in my earlier message.please tell me if you find some problem in the
> > > control.
> > > thanks and reply
> > >
> > > "Mihajlo Cvetanovic" wrote:
> > >
> > > > sayu wrote:
> > > > > 2)when i displayed 1 set of data(512 bytes) in OnInitdialog() function(not
> > > > > using SetTimer  and Ontimer) then there is no problem.so logic is ok
> > > >
> > > > What happens if you display both sets in OnInitDialog?
> > > > What happens if you display only one set in OnTimer?
> > > > When exception occurs what are the values of "this" and m_pCtrlSite?
> > > > Maybe CWnd::DestroyWindow is somehow called twice...
> > > >
> >
> > I've already done this with no errors. See my other reply. No point in
> > two of us doing it.
> >
> > Hugh
> >
> >

The chances of the y values or the timer stuff having anything to do
with your crash are very slim. Try setting all the y values to 0.2 and
see if it makes a difference. Try cutting out bits of functionality
until the problem goes away. Are you allocating any dynamic memory?
What is the call stack when the exception occurs? These are all
questions you should be asking yourself.

As I've already demonstrated the code you originally posted is most
likely not the problem. 

Good luck,

Hugh

hello guys,
                my problem is solved.Finally tired of all the debugging I 
created a new project and inserted the same code in that.It worked 
allright!!!!!:)
But thinking about it i decided what could have went wrong with Killtimer or 
for that matterCWnd::OnDestroy() and Destoryctrl() in that .Whether some 
function might have accidently got deleted or some file.When i posted a query 
in my program to find function DestroyCtrl() it gave me message,"cannot find 
string".i think these are standard windows functions and are only linked 
while compiling and build.So can u people guess what the problem might have 
been...It will be useful for me in future....
and thanks a lot for your guidence and help
 

"hughgray@hotmail.co.uk" wrote:

> sayu wrote:
> > I am working on your points but it will be of help if you please go through
> > the code of the control whenever you have time.I have given the link to the
> > control in my earlier message.please tell me if you find some problem in the
> > control.
> > thanks and reply
> >
> > "Mihajlo Cvetanovic" wrote:
> >
> > > sayu wrote:
> > > > 2)when i displayed 1 set of data(512 bytes) in OnInitdialog() function(not
> > > > using SetTimer  and Ontimer) then there is no problem.so logic is ok
> > >
> > > What happens if you display both sets in OnInitDialog?
> > > What happens if you display only one set in OnTimer?
> > > When exception occurs what are the values of "this" and m_pCtrlSite?
> > > Maybe CWnd::DestroyWindow is somehow called twice...
> > >
> 
> I've already done this with no errors. See my other reply. No point in
> two of us doing it.
> 
> Hugh
> 
> 

sayu wrote:
> while compiling and build.So can u people guess what the problem might have 
> been...It will be useful for me in future....

I guess the bug is in the code that is different in old and new project 
:-) There is not enough information to give you more detailed answer.

sayu wrote:
> hello guys,
>                 my problem is solved.Finally tired of all the debugging I
> created a new project and inserted the same code in that.It worked
> allright!!!!!:)
> But thinking about it i decided what could have went wrong with Killtimer or
> for that matterCWnd::OnDestroy() and Destoryctrl() in that .Whether some
> function might have accidently got deleted or some file.When i posted a query
> in my program to find function DestroyCtrl() it gave me message,"cannot find
> string".i think these are standard windows functions and are only linked
> while compiling and build.So can u people guess what the problem might have
> been...It will be useful for me in future....
> and thanks a lot for your guidence and help
>
>
> "hughgray@hotmail.co.uk" wrote:
>
> > sayu wrote:
> > > I am working on your points but it will be of help if you please go through
> > > the code of the control whenever you have time.I have given the link to the
> > > control in my earlier message.please tell me if you find some problem in the
> > > control.
> > > thanks and reply
> > >
> > > "Mihajlo Cvetanovic" wrote:
> > >
> > > > sayu wrote:
> > > > > 2)when i displayed 1 set of data(512 bytes) in OnInitdialog() function(not
> > > > > using SetTimer  and Ontimer) then there is no problem.so logic is ok
> > > >
> > > > What happens if you display both sets in OnInitDialog?
> > > > What happens if you display only one set in OnTimer?
> > > > When exception occurs what are the values of "this" and m_pCtrlSite?
> > > > Maybe CWnd::DestroyWindow is somehow called twice...
> > > >
> >
> > I've already done this with no errors. See my other reply. No point in
> > two of us doing it.
> > 
> > Hugh
> > 
> >

Glad you managed to fix it.

Hugh