C# passing double array to C++ dll

Question

I have an array initialized in C# code; Then I am going to pass it to C++ dll in which each single entry of the array will be re-assigned with new value. Then the array with be returned back to C# with the new value. I am wondering

what is the best way to pass the array from C# to C++? (Data structure of this array in C#)
What is the best way to return the array from C++? (Data structure of this array in C++)

My code is not working:

In C#

private static double[] _statsArray = new double[4];
GetImageStats( ref _statsArray);

In C++ dll:

DllExportImageStatistics GetImageStats( double (&pSignalArray)[4])

Thanks for any suggestions; A couple of lines of code will help a lot.

There is a descent article on passing arrays between managed and unmanged code msdn.microsoft.com/en-us/library/z6cfh6e6.aspx and same question has been asked sevral time, so those links may help you stackoverflow.com/questions/2406972/… stackoverflow.com/questions/9340333/return-c-arrays-to-c-sharp etc — Saqlain
– Saqlain, Commented Mar 11, 2013 at 13:44
There should be a managed prototype that has a [DllImport] attribute in front of it. — Jim Mischel
– Jim Mischel, Commented Mar 11, 2013 at 14:03

Matthew Watson · Accepted Answer · 2013-03-11 13:53:34Z

2

I think it should be:

private static double[] _statsArray = new double[4];
GetImageStats(_statsArray); // Lose the ref

And

DllExportImageStatistics GetImageStats(double pSignalArray[4])

answered Mar 11, 2013 at 13:53

Matthew Watson

111k12 gold badges179 silver badges301 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

C# passing double array to C++ dll

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related