Dynamic Creation and Plotting in CNiGraph

Hi,
I would like to create a temporary CNiGraph object, plot some data, and render it to an image. I am able to create the object dynamically (I think) but I get a runtime error when trying to plot data (using ChartY) on the graph.
The error is in the function AfxGetAmbientActCtx.
My code for control creation looks like:
CNiGraph niGraph;
CRect rect(CPoint(0, 0), m_Size); // the size of the graph
CDC *pDC = pWnd->GetDC();
BSTR bstrLic = :ysAllocStringLen(/* stuff to generate the license */);
niGraph.CreateControl("CWGraph", "", WS_VISIBLE, rect, pWnd,
   m_staticControlID++, NULL, FALSE, bstrLic);
   //use the static control ID to ensure unique IDs
:ysFreeString(bstrLic);
ChartPreviewData(niGraph, pList, settings);
   // ... some untested code to render to an image follows
pWnd is a CPropertySheet (which is a valid window, but I am using as a dummy to temporarily hold the graph). ChartPreviewData does this...
void CXyzClass::ChartPreviewData(
CNiGraph &graph, ... some other arguments....)
   // some code to get the data ready to put in the NI vector
CNiReal64Vector niVector(numPoints, pBuffer);
graph.SetChartLength(numPoints);
// Chart data and adjust delta X to reflect sampling frequency used
CNiPlot plot = graph.Plots.Add();
plot.MultiPlot = TRUE;
plot.ChartY(niVector, (double) 1/pSeries->GetFs()); // crashes
delete pBuffer;
When I step through in the debugger, it looks like NiGraph gets created okay. In fact, I can see it on the dialog. However calling ChartY is giving me a runtime error. I suspect I am missing something to do with ActiveX but I'm not sure what.
Thanks, Nick
Solved!
Go to Solution.

Sorry, this is resolved. I had a stupid error and was passing a zero-length vector to ChartY.
I dicovered that way up on the call stack a exception was being thrown because of this.

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Edited by: Suhas Saha on Aug 2, 2011 11:04 AM

Hi Madhura,
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I've got an XY Graph with some dynamic number of plots to graph. Once I know this number, I change the LegPlots property and plot the data from an array containing all the plots. The data is displayed correctly, but I get overlapping colors. Say I'm only trying to graph 3 plots. I get three lines (good) but then the three lines have 29 colors (bad), as if it's plotting all possible plots at the data points of the three. The legend updates to only show three (good), but am I missing something else? Does the LegPlot property not govern that, but only governs the legend itself?

If the problem is the code then I'll take a look at my mess of wire, I just wanted to see if it was the LegPlots property first.
Here's what it looks like, just in case
Attachments:
toomanycolors1.JPG ‏25 KB

Dynamic Tables and UI

Hello All,
I hope i am posting this in the right area. Please excuse if i am not.
I have a pretty unusual problem.
I have a table with the following columns. "EXTERNAL_ID" "PERIOD" "AMOUNT" and other fields.
in this table, period is a date value and external_id refers to some project. (This is not unique)
i am having values in the fields like
101000 20081101 8
101000 20081201 9
101000 20090101 25
101453 20081101 5
and so on.
i would like to put these into an internal table ( Context table ) of the form "External_ID" "NOV-08" "DEC-08" and so on............
the data should look like
101000 8 9 25
101453 5
One additional problem here is that the dates are dynamic and can differ every time the program is run.
Is there any way to do this efficiently. The number of rows in my first table can be very large (upto 80000 )
Thanks & Regards,
Mz

Hi,
Then you need to build the dynmic node to acheve this.
Depending on the numdber of months, I guess this can be known based on some input. Some basic criteris should be there as how to get the number of mothns, based on this create a Dynamic Internal table with that many columns and bind the saame to the dynamic node.
For Ex: If a project runs for a ayear/months, i will get fical periods for a project suing some standard FM. we can get to know this right.
Are you using normal Table UI or ALV to display.
Refer Dynamic Node and Internal table creation -
Re: Create dynamic table of dynamic node
Regards,
Lekha.

Logic of array and plotting functions?

Hi,
I started to build versatile acquisition programn with labview (with NI cards it seemed to be the best option) and it took quite an effort to adjust the way of thinking while shifting from other programming environments. I start to see the logic behind the labview but I have serious difficulties on figuring out how the labview's array and plotting functions work. Here's a simple example for replacing array subset and plotting it, which just doesn't work as i'd expect. I thought this would first initialize 10 rows, 1000 cols matrix of which the certain row would be replaced (zero padding when new row is longer than the original). The resulting matrix would then be displayed each row having its own windows in the stacked plot. It seems to do something totally different...
Attachments:
koe4.vi ‏303 KB

As you noticed, "Replace Array Subset" can only replace array elements that exist. If it's not there, there's nothing to replace.
What you'll need to do is make the array larger by using the "Insert into Array" function. Use this function cautiously though. It requires LabVIEW to dynamically reallocate memory while the program is running, and takes time. If you only do the 'Insert' when needed, you should be OK.
Use the "Array Size" function to get the size of the array to be inserted, then you can choose between the ‘Insert’ or ‘Replace’ functions.
Ed
Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.

Help with dynamic datasource and record selection

Hi, I'm having some difficulty with part of an application I'm trying to build, but here's some background first. I am a student at the University of Maryland, and I'm writing an application for one of the departments here at the university. It is sort of a front-end for an access database with a lot of extra functionality. This includes reports. First of all, the user can change the databse that the application uses, so I store that in an appsetting. For this reason, I have to tell the report what database to use at runtime rather than using the database expert. I am building a sort of report wizard in which the user selects certain values, and based upon those values, the SQL statement that the report gets data from changes. So almost everything about the report's data is dynamic and will be determined at runtime. So for example if the user chooses an officer report by chapter names, I do this (chapters is a comma delimited string): string sel = "SELECT * FROM [Undergrad Leadership] WHERE [Leadership Position] = '" + txtPosition.Text + "' AND [Chapter Name] IN (" + chapters + ");"; The part I am lost on, is how to actually interface with crystal reports. In the following code, conn is an OleDbConnection to the correct database, rep is the ReportDocument, and view is a CrystalReportsViewer. rep.DataSourceConnections[0].SetConnection(conn.DataSource, conn.Database, false); rep.RecordSelectionFormula = sel; view.ReportSource = rep; When I try to load the report, I get the following error message: Error in formula <Record Selection>: a number, currency amount, boolean, date, time, date-time, or string is expected here. Also, assuming this formula gets fixed, how do I actually get fields from this formula and datasource onto my report, since I can't do it at design time? Thanks in advance for the help. -Jared 

RCAPI (Report Creation and Modification) calls are only available with Crystal Reports Server RAS SDKs. This means that using the bundled version of Crystal Reports for Visual Studio will not allow you to place fields onto the report. A free copy of Crystal Reports Server comes with a registered copy of Crystal Reports Developer. My guess is that you don't have either of these products and that you are just using the product that came with Visual Studio.All is not lost. The first question is, do you really need to add the fields at runtime? In many cases developers just want to have control of the data that gets sent to the report and they are ok with having the same fields display.In your code you are changing the datasource which is fine, and you are assigning a Record selection formula which is also fine. The problem with the record selection is that it doesn't fit the syntax of the Report. I would suggest printing out the value that you programatically get for the formula and insert it into the Crystal Report Designer. You will probably get the same error there and gets some hints as to why it doesn't work.What I would suggest is creating a template report that already has the fields on the report and then change its datasource at runtime and add a RecordSelectionFormula.Otherwise you will have to use RAS to be able to add fields at runtime. Rob Horne <a href="/blog/10">Rob's blog - http://diamond.businessobjects.com/blog/10</a>

Dynamic Creation and Plotting in CNiGraph

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