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Another crash - but hard to reproduce

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I just found another situation in which the control crashes. Using purely

COM Automation, it certainly happen in PIE charts, I believe it also can

happen DONOUGHT charts, and so far I was not able to get this error in Bar

or line charts of any kind.

This crash happens if you listen for the LButtonDblClick und RButtonDBLClick

events and change the data of the chart during the event handling. If you

use a pie chart for doing so the following, very fast combination of clicks

will crash the control. LBUTTON LBUTTON RBUTTON. As I observed the problem,

it looks like that the control still has the the old data (not yet displayed

the new data) while the RBUTTON event comes in. This seems to cause the

problem, but this is only an observation.

I am using VC6, and I just generated all the wrapper classes for the ActiveX

control. Then I generated event sink handler and used the following code to

reproduce the problem.

void CChartfxDlg::OnLButtonDblClkChart1(short x, short y, short nSerie, long

nPoint, short FAR* nRes)


// TODO: Add your control notification handler code here

CChartFX *chart = (CChartFX*)this->GetDlgItem(IDC_CHART1);

chart->OpenDataEx(1, 4, 4);

chart->GetSeries().GetItem(0).SetYvalue(0, 1);

chart->GetSeries().GetItem(0).SetYvalue(1, 2);

chart->GetSeries().GetItem(0).SetYvalue(2, 3);

chart->GetSeries().GetItem(0).SetYvalue(3, 4);

chart->GetSeries().GetItem(1).SetYvalue(0, 1);

chart->GetSeries().GetItem(1).SetYvalue(1, 2);

chart->GetSeries().GetItem(1).SetYvalue(2, 3);

chart->GetSeries().GetItem(1).SetYvalue(3, 4);

chart->GetSeries().GetItem(2).SetYvalue(0, 1);

chart->GetSeries().GetItem(2).SetYvalue(1, 2);

chart->GetSeries().GetItem(2).SetYvalue(2, 3);

chart->GetSeries().GetItem(2).SetYvalue(3, 4);

chart->GetSeries().GetItem(3).SetYvalue(0, 1);

chart->GetSeries().GetItem(3).SetYvalue(1, 2);

chart->GetSeries().GetItem(3).SetYvalue(2, 3);

chart->GetSeries().GetItem(3).SetYvalue(3, 4);


*nRes = 1 ;


void CChartfxDlg::OnRButtonDblClkChart1(short x, short y, short FAR* nRes)


// TODO: Add your control notification handler code here

CChartFX *chart = (CChartFX*)this->GetDlgItem(IDC_CHART1);

chart->OpenDataEx(1, 1, 1);

chart->GetSeries().GetItem(0).SetYvalue(0, 5000);


*nRes = 1;


void CChartfxDlg::OnRButtonUpChart1(short x, short y, short FAR* nRes)


// TODO: Add your control notification handler code here

*nRes = 1;


As I said it is very hard to do so, but possible. It also looks like that

this may actually be easier to reproduce if the event handler took more

time. This is the case in our application - there the actions in the event

sink handlers are bit more complicated. But since we are using our own

language I cannot post that code directly. But because I could reproduce the

problem in VC I believe this is an problem in the control.

I hope you are able to reproduce it and then be able to fix that. It happens

only if you click really fast. Please let me know how you proceed.

Thanks a lot in advance,

Stephan Klaffer

DecisionWorks London

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