Dynamic creation and tracing in CNiGraph
Hello
I would like to create a temporary object of CNiGraph, plot data and make a picture. I am able to create the object dynamically (I think) but I get a runtime error when you try to plot data (using Idrsqu) on the graph.
The error is in the AfxGetAmbientActCtx function.
My code for creating control looks like:
CNiGraph niGraph;
CRect rect (CPoint (0, 0), m_Size); the size of the graphic
CDC * pDC is pWnd-> GetDC();.
BSTR bstrLic =:ysAllocStringLen (/ * stuff to generate the license * /);
niGraph.CreateControl ("CWGraph", "", WS_VISIBLE, rect, pWnd,)
m_staticControlID ++, NULL, FALSE, bstrLic);
Use static control ID to ensure unique IDs
:ysFreeString (bstrLic);
ChartPreviewData (niGraph, pList, settings);
... is the result of an untested for the rendering of an image code
pWnd is a CPropertySheet (a window is valid, but I use as a model to temporarily hold the chart). ChartPreviewData for this...
void CXyzClass::ChartPreviewData)
CNiGraph & graphic,... a few other arguments...)
{
a code to get ready to put in the vector data OR
CNiReal64Vector niVector (numPoints, pBuffer);
Graph SetChartLength (numPoints);
The data graphic and set delta X to reflect the sampling frequency used
CNiPlot field = graphics. Plots.Add ();
parcel of land. MultiPlot = TRUE;
parcel of land. Charts (niVector, (double) 1 / pSeries-> GetFs()); crashes
Remove pBuffer;
}
When I scroll in the debugger, it looks like NiGraph gets created correct. In fact, I can see from the dialog box. However the call Idrsqu gives me a runtime error. I suspect I'm missing something to do with ActiveX, but I don't know what.
Thank you, Nick
Sorry, it's resolved. I had a stupid mistake and going on a vector of length zero to Idrsqu.
I discovered this way upward in the call stack an exception was thrown for this reason.
Tags: NI Software
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