User (Legacy) Posted February 7, 2001 Report Share Posted February 7, 2001 Serge, (I always get lost in the C++ code!) "If (nSeries == 0 || nPoints == 0)" If is True, can't you fill the chart with 1 series 1 or more points but use CHART_HIDDEN for the value to create an "empty" chart but one that perhaps will not "blow up"? In vb: ChartFX1.OpenDataEx COD_VALUES, 1, 1 ChartFX1.ValueEx(0, 0) = CHART_HIDDEN ChartFX1.CloseData COD_VALUES Steve Serge S. Spiridonoff <sss@corbina.net> wrote in message news:0iYagCKkAHA.1808@sfxserver.softwarefx.com... > Hi! > > The application I'm working on can extract data from different sources (like > databases or text files) and then plot specified (by the user) columns and > records on charts. Then, the charts may be printed. > > Such operations may be automated by running the app by a scheduler. But this > means that the source data may vary between runs. Particularly, the source > DB may have no records or the source file become empty (no columns). > > In such a case the app have to display an empty chart, either a chart with > non-zero number of series and zero number of points or a chart with "no data > available" text only. > > To achieve this, I do the following. > > // create the chart control > ...CreateInstanceLic(...&m_pChartFX); > ... > > // clear series legend > m_pChartFX->ClearLegend((CfxLegend)CHART_SERLEG); > > if (nSeries == 0 || nPoints == 0) > { > // empty chart > m_pChartFX->ClearData(CfxDataMask(CD_VALUES|CD_XVALUES)); > > m_pChartFX->LegendBox = AFX_OLE_FALSE; > > return; > } > > // pass extracted data to the chart > ... > > then I create and show a chart window, if it is not already created > > m_pChartFX->CreateWnd(...); > > And this is the point where the Chart FX library crashes with a Divide by > Zero exception. > > > I've posted the sample MFC application (see ChartFX crash post) but nobody > (especially tech. support) replied. > > Not hoping to get a reply from the tech support any more, at least, could > somebody please suggest something to change (or add) in the code to work > around the crash. > > Please note that I can't just do nothing (i.e. CreateInstanceLic followed by > immediate CreateWnd) because the application allows users to re-extract > data. That is, a user may extract data and create a chart from them > (non-zero number of points and series at this time). And then, after some > period of time, he/she may request the app to re-extract data and update the > chart. But at this time the data source may change to contain no records, so > the app will have to "clear" the chart somehow. > > Thanks in advance, > Serge > > > Quote Link to comment Share on other sites More sharing options...
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