Golang 中的 cgo 使用方法，调用 libevent (c语言类库)为案例

• cgo-libevent-for-windows
  • 参考文章：
  • 1.环境（windows）
  • 2.下载libevent源码 并制作dll动态库 利用mingw-utils生成.a .def
  • 3.测试代码：
  • 4.go build：

https://www.kancloud.cn/idzqj/customer/2026575
https://www.cnblogs.com/pandamohist/p/14227440.html

安装文件和具体文档都在setup文件夹中

go 1.13
libevent 2.1.10
cmake 3.22
mingw && mingw-utils
visualstudio 2013/2017
openssl

根据libevent编译手册操作即可

mingw-utils命令：

    pexports libevent.dll > libevent.def
    dlltool.exe -D libevent.dll -d libevent.def -l libevent.a -k
    
    pexports libevent_core.dll > libevent_core.def
    dlltool.exe -D libevent_core.dll -d libevent_core.def -l libevent_core.a -k
    
    pexports libevent_extra.dll > libevent_extra.def
    dlltool.exe -D libevent_extra.dll -d libevent_extra.def -l libevent_extra.a -k

package main


import "C"
import (
	"fmt"
	"unsafe"
)

func main() {
	C.puts(C.CString("cgo-libevent-for-windows"))

	var pev *C.struct_event = C.getEventPtr()
	var ptv *C.struct_timeval = C.getTvPtr()
	var base *C.struct_event_base

	base   = C.event_base_new()  //*C.struct_event_base
	var pbase *C.struct_event_base  = (*C.struct_event_base)(unsafe.Pointer(base))

	C.ev_set_timer(pev, (C.cb)(unsafe.Pointer(C.timer_cb)))
	C.event_base_set(pbase, pev)
	C.event_add(pev, ptv)
	C.event_base_dispatch(pbase)

	C.event_base_free(pbase)

	Pause()
}

func Pause() {
	var str string
	fmt.Println("")
	fmt.Print("请按任意键继续...")
	fmt.Scanln(&str)
	fmt.Print("程序退出...")
}

常见错误：cgo_libevent_for_windows cc1.exe: sorry, unimplemented: 64-bit mode not compiled in

windows命令行：
    SET CGO_ENABLED=1
    SET GOOS=windows
    SET GOARCH=386
    SET GO111MODULE=off
    go build -x

goland编译器：
    goland-environment：CGO_ENABLED=1;GOOS=windows;GOARCH=386 

https://github.com/zld126126/cgo_libevent_for_windows