golang 编译 dll 过程中需要用到 gcc，所以先安装 MinGW。
windows 64 位系统应下载 MinGW 的 64 位版本： https://sourceforge.net/projects/mingw-w64/
下载后运行 mingw-w64-install.exe，完成 MingGW 的安装。
首先撰写 golang 程序 exportgo.go：
package mainimport "C"import "fmt"//export PrintByefunc PrintBye() { fmt.Println("From DLL: Bye!")}//export Sumfunc Sum(a int, b int) int { return a + b;}func main() { // Need a main function to make CGO compile package as C shared library}编译成 DLL 文件：
go build -buildmode=c-shared -o exportgo.dll exportgo.go
编译后得到 exportgo.dll 和 exportgo.h 两个文件。
参考 exportgo.h 文件中的函数定义，撰写 C# 文件 importgo.cs：
using System;using System.Runtime.InteropServices;namespace HelloWorld{ class Hello { [Dllimport("exportgo.dll", EntryPoint="PrintBye")] static extern void PrintBye(); [Dllimport("exportgo.dll", EntryPoint="Sum")] static extern int Sum(int a, int b); static void Main() { Console.WriteLine("Hello World!"); PrintBye(); Console.WriteLine(Sum(33, 22)); }编译 CS 文件得到 exe
csc importgo.cs
将 exe 和 dll 放在同一目录下，运行。
>importgo.exeHello World!From DLL: Bye!55
golang 中的 string 参数在 C# 中可以如下引用：
public struct GoString { public string Value { get; set; } public int Length { get; set; } public static implicit operator GoString(string s) { return new GoString() { Value = s, Length = s.Length }; } public static implicit operator string(GoString s) => s.Value; }// func.gopackage mainimport "C"import "fmt"//export Addfunc Add(a C.int, b C.int) C.int {return a + b}//export Printfunc Print(s *C.char) { print("Hello ", C.GoString(s)) //这里不能用fmt包，会报错，调了很久...}func main() {} 编译
go build -ldflags "-s -w" -buildmode=c-shared -o func.dll func.go
还是有点大的，880KB，纯C 编译的只有48KB，应该是没有包含全部的依赖吧，go是全包进来了
Go 调用
package mainimport ("fmt""syscall")func main() {dll := syscall.NewLazyDLL("func.dll")add := dll.NewProc("Add")prt := dll.NewProc("Print")r, err, msg := add.Call(32, 44)fmt.Println(r)fmt.Println(err)fmt.Println(msg)name := C.CString("Andy")prt.Call(uintptr(unsafe.Pointer(name)))}out:760The operation completed successfully.Hello Andy
Python 调用
from ctypes import CDLL, c_char_pdll = CDLL("func.dll")dll.Add(32, 33)dll.Print(c_char_p(bytes("Andy", "utf8")))C++调用
#include#include using namespace std;typedef int(*pAdd)(int a, int b);typedef void(*pPrt)(char* s);int main(int argc, char *argv[]){ HMODULE dll= LoadLibraryA("func.dll"); pAdd add = (pAdd)GetProcAddress(dll, "Add"); pPrt prt = (pPrt)GetProcAddress(dll, "Print"); cout << add(321, 33) << endl; prt("Andy"); FreeLibrary(dll); return 0;}
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