How to get Magnetic Variation?

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Hello All

I have a problem where I have to figure out the Magnetic Variation of a point.

Here's the background. I want to use the industry standard for figuring out Magnetic Variation. It's located at here. I've downloaded the file WMM2010GUI.zip and within it has a program called WMM.exe. This program does exactly what I want. You put a Lat, Long and height and then you push calculate and then it figures out the declination.

So, within the zip file is also what I believe is the code to this exe but the problem is that it's in C++. Is there a way to use the code in a C# project? I want to pass at least 4 variables to it, Lat, Long, Height and Date. How do I do this?

There's two parts to this. The first is getting the declination and then the next is that I have a whole list of points within an Access table that looks like this - Lat, Lon, Height, Date, MagVar
45.11,-34.11,100,2013-Jan-1,
65.11,89.11,100,2013-Jan-1,

Has anyone ever done something like this? Also, how do I add a C++ project with my C# project?

Thanks

Mike

Posted 1-Feb-13 16:13pm

mzrax

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OriginalGriff · Answer 1 · 2013-02-01T23:19:00

Depends on what type of C++ it is: if it is CLR code, then you can just add it as a reference and call it's methods as if they were C# - the framework will sort it all out for you.

If it is native C++ code, then you may be able to use it, but you will have to read up on P/INVOKE and will have to find out what functions the C++ code exposes.

You can add a C++ CLR project to your solution very easily: Right click the solution and select "Add...Existing Project..." then follow the dialogs from there.

The other alternative is to use it as is: you can execute it as a process and it may be possible to provide it with command line arguments to make it work without it's GUI (which I assume it has from your "push calculate" comment.

There is another option: rewrite the C++ code which does the work in C# (and ignore the GUI if you don't need it).

Sorry, but we can't give a definitive answer based on that little info! :laugh: