package mian

import "C"

//export Min
func Min(a,b) int32{
   if a>b{
     return int32(b)
  } 
      return int32(a)
}

　　编译命令

      go build -ldflags "-s -w" -buildmode=c-shared -o net.dll main.go

package main

/*
#include <stdio.h>
#include <stdlib.h>
*/
import "C"

import (
    "unsafe"
)

func main() {
    for i := 1; i < 999; i++ {
        cstr := C.CString("Hello, world")

        C.free(unsafe.Pointer(cstr))//释放内存 必须引入stdlib.h 标准库
    }

}

//返回文本//export Tostring
func Tostring(a *C.char) *int32{
    text := C.GoString(a)
    cstr := C.CString(text)
    //C.free(unsafe.Pointer(cstr))
    return (*int32)(unsafe.Pointer(cstr))
}

//export Getslice//传输字节集
func Getslice(CC **C.char,)int{
   aa:="fdfdfsfdsfdsfdsfdsfsd"
   zz:=[]byte(aa)
   *CC=(*C.char)(unsafe.Pointer(C.CBytes(zz)))
   return len(zz)
}