Pass a slice of custom type from Go to C#

Question

I am trying to integrate a Go application inside a large C# project. By using CGO it is easy to export functions from Go to C#, especially when the Go function return a generic type.

However, I have the need to call a Go function which return a slice of custom type from C#, possibly casting the slice to a C# list or array.

The Go function look like this

func Myfunc(n []int, m float64) []Res{...}

where type Res is

type Res struct {
    w IW
    p []Prs
    ti int64
    ms   int64
}

type Prs struct {
    mmz float64
    cge    int
    itntn int64
}

type IW struct {
    ledg float64
    redg float64
}

I could not find any documentation or example on the web, can I do this somehow?

user_4782509 · Answer

I don't know how C# invoke Go, let's assume we are going to invoke Go function from C code.

You need define Res struct in C file. like cgo_interface.h
Then you write a cgo file like this:

package cinvokego

/*
#cgo CFLAGS: -I ${include}
#cgo LDFLAGS: -L ${libs}
#include "cgo_interface.h"
*/
import "C"

func GoFuncs(retArr *unsafe.Pointer, otherargs int) {
    // allocate memory and fill the retArr in here
}

Then use go build --buildmode=c-archive cinvokego.go
Then you will get header file and archive file generated by go build.
Then you use header and archive like normal C resource.
Then use C# to invoke C resource.

Pass a slice of custom type from Go to C#

1 Answers