MATLAB coder - selecting output type for entry point function
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I'm trying to use matlab coder to create C++ code, compile into a DLL and use this inside a C# project. I have a single entry point function that returns a 1x3 array in matlab, i.e.
function oneByThreeArray = exampleFunction(input1, input2, input3,...){...}
When coder is run, the default behaviour is to convert this entry point to
void exampleFunction(const double input1, const double input2, const double input3,..., double oneByThreeArray[3])
So my two questions are
- is it possible to set the C++ output type (rather than void) of my entry point function so that it returns a value for oneByThreeArray (e.g. std::array) before the code is generated by the coder?
- if not, how should this C++ code be called from within C#? If oneByThreeVector is initialised just before the function call, will it be filled with the desired output values afterwards?
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Answers (2)
Yoke Peng Leong
on 18 May 2018
You can consider creating the function such that the output oneByThreeArray is pass by reference:
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Simone Pagliuca
on 4 Dec 2022
Edited: Simone Pagliuca
on 4 Dec 2022
I know this is old but since I encountered the same problem, I'll post the solution anyway.
In my testing using an array creates some problems (I'll edit if i find a solution), but you can pull it off with multiple values:
So instead of
function array = myfunction(arg1, arg2)
you write it like
function [value1, value2, value3] = myfunction(arg1, arg2)
where the 3 values are you arrays elements.
Then, you generate the DLL.
Then, C#:
First of all, import the dll:
[DllImport("myfunction.dll",
CallingConvention = CallingConvention.Cdecl)]
public static extern void myfunction(Double arg1, Double arg2, out Double value1, out Double value2, out Double value3);
note that the function is of type void and the outputs are set as arguments with the prefix out.
Then to use it:
double value1;
double value2;
double value3;
sg_geometry(arg1, arg2, arg3, out value1, out value2, out value3);
So now you have your results in the variables value1, value2, value3.
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