MATLAB coder - selecting output type for entry point function

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Daniel Murphy
Daniel Murphy 2018-5-10
编辑： Simone Pagliuca 2022-12-4
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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回答（2 个）

Yoke Peng Leong
Yoke Peng Leong 2018-5-18
You can consider creating the function such that the output oneByThreeArray is pass by reference:
https://www.mathworks.com/examples/matlab-coder/mw/coder-ex37517449-pass-structure-arguments-by-reference-or-by-value-in-generated-code
Simone Pagliuca
Simone Pagliuca 2022-12-4
编辑：Simone Pagliuca 2022-12-4
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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