Mathias Brandewinder on .NET, F#, VSTO and Excel development, and quantitative analysis / machine learning.
by Mathias 12. December 2009 11:43

A few days back, I stumbled upon this page, where Frank Rice describes how to use VBA to list all VBA macros and functions a Workbook contains. I thought that was interesting: it’s not the type of VBA code most commonly seen, and the idea of VBA code interacting with VBA code is fun. So I tweeted it, and Charts GrandMaster Jon Peltier, in his own words,  could not “leave anything alone, and made some changes to how the procedure worked”. Nice changes, if I might add.

I am not one to leave anything alone, either, and wanted to check how well that would work using C#.

Disclaimer: I have done enough checking to know that the code works in non-twisted cases, but this is far from polished. This would need some handling for exceptions before making it to anything shipped to a client you care about, for instance. My goal was to provide a solid code outline, feel free to modify to fit your needs.

The class/method below takes in a fully-qualified file name (i.e. with the full path, just what you would get from an OpenFileDialog), and searches for all the procedures (sub or function) defined in VBA.

As a bonus, I added some extra code to extract the signature of the procedure, and the header comments. The signature - what arguments it takes as input, and what it returns - is a much better summary than simply its name, and I figured that if the author bothered to add comments, it was probably extracting that, too. It also illustrates nicely some of the functionalities of the API.

More...

by Mathias 29. October 2009 10:05

Recently, a client asked me if it was possible to create an Excel scatter plot of his products, adding a label on each data point, and using different colors and symbols for different types of products. You could think of this as plotting 5 dimensions at once, instead of the usual two.

I quickly coded a VBA macro to do that, with a sample workbook to illustrate the usage. The macro is pretty rough, but was sufficient for my needs as is, so I haven’t put extra efforts in: feel free to improve upon it…

Here is a sample of the output:PowerScatterPlot

More...

Comments

Comment RSS