Question

I have been trying to plot a map on axmapcontrol and use the same ITable to create a scatterplot graph in IDataGraphwindow2. Unfortunately the graph appears with correct data but no click events on the graph are working. The left click shows a memory error and the right click shows a disabled menu. For left click I think DataGraphTUI.dll is responsible. When we load the IDataGraphWindow2, we don’t initialize this due to which probably it gives an error.

Please find the code below.

IDataGraphWindow2 pDGWin;
IDataGraphT dataGraphT = new DataGraphTClass();
IWorkspace shapefileWorkspace = null;
IWorkspaceFactory shapefileWorkspaceFactory = new ShapefileWorkspaceFactoryClass();
shapefileWorkspace = shapefileWorkspaceFactory.OpenFromFile("C:\\abc.shp "), 0);
featureWorkspace = (IFeatureWorkspace)shapefileWorkspace;

featureLayer.FeatureClass = featureWorkspace.OpenFeatureClass(System.IO.Path.GetFileNameWithoutExtension("c:\\abc.shp"));

ITable gobjJoinedTable = (ITable)featureLayer.FeatureClass;

LoadaxMap(); /// a method to load up the axmapcontrol

dataGraphT.UseSelectedSet = true;
dataGraphT.HighlightSelection = true;
dataGraphT.GeneralProperties.Title = "Scatter Graph";
dataGraphT.LegendProperties.Visible = false;
dataGraphT.get_AxisProperties(0).Title = "Y Axis";
dataGraphT.get_AxisProperties(0).Logarithmic = false;
dataGraphT.get_AxisProperties(2).Title = "X Axis";
dataGraphT.get_AxisProperties(2).Logarithmic = false;

ISeriesProperties seriesProps = dataGraphT.AddSeries("scatter_plot");
seriesProps.SourceData = axMap.get_Layer(0) as ITable; // axMap is the map control. Itable direct binding also works here

seriesProps.SetField(0, "abc.shp-fieldname"); // you may add any fieldname
seriesProps.SetField(1, "abc.shp-fieldname");

dataGraphT.Update(null);
dataGraphT.UseSelectedSet = true;
dataGraphT.HighlightSelection = false;
dataGraphT.Update(null);
pDGWin = new DataGraphWindowClass();
pDGWin.DataGraphBase = dataGraphT;
pDGWin.PutPosition(546, 155, 1040, 540);
pDGWin.Show(true);

The memory error is
Access violation at address 0F4E358B in module ‘DatagraphTUI.dll’. Read of addess 00000000

Answer 1

Had the same problem while displaying the graph.
Fixed it by using this line of code:

graphWindow.Application = ArcMap.Application

All it needs is a reference to the ArcMap Application.