生成的dll库代码

// GoDll.cpp : 定义 DLL 应用程序的导出函数。
//#include "stdafx.h"
#include <iostream>
#include <cstdint>void  __stdcall void_R0()
{std::cout << __FUNCTION__ << std::endl;
}void  __stdcall void_R1(const char* name)
{std::cout << __FUNCTION__ << " ----> " << name << std::endl;
}void  __stdcall void_R2(const char*name ,char **outName)
{std::string _name = "HintSoft 新浩艺-";_name += name;strcpy(*outName,_name.c_str());
}uint8_t __stdcall uint8_R1(char** outJson)
{*outJson = new char[256];memset(*outJson,0,256);strcpy(*outJson,"Hello -> 你被骗了，这里没有Json,只有中文");return 1;
}void __stdcall uint8_R1_free(char** outJson)
{if(outJson == 0) return;if(*outJson == 0) return;delete [](*outJson);*outJson = nullptr;
}typedef void (*CallBackFunType)(const char * in);
void setCallBackFun(CallBackFunType func)
{if(!func){std::cout << __FUNCTION__ << "   NULL ptr" << std::endl;}func("hello CallBackFuncType  ---- setCallBackFun");
}

导出函数def

EXPORTS
void_R0						@1
void_R1						@2
void_R2						@3
uint8_R1					@4
uint8_R1_free				        @5
setCallBackFun				        @6

go调用测试

package mainimport ("fmt""syscall""unsafe"
)/*
#include <stdio.h>   // 如果要调用C.free 一定要在些包含对应的头文件
#include <stdlib.h>// 以下两种方式任选其一
void CallBackFun( char* in);
//void CallBackFun( char* in)
//{
//	printf("%s\r\n",in);
//}*/
import "C"// export 必须要
//export CallBackFun
func CallBackFun(in *C.char) {fmt.Print(C.GoString(in))
}func main() {fmt.Println("---------------------------------------------------------------")handle, err := syscall.LoadDLL("GoDll.dll")if err != nil {fmt.Println(err.Error())return}fmt.Println(handle.Handle)fmt.Println(handle.Name)void_R0, err := handle.FindProc("void_R0")if err != nil {fmt.Println("void_R0 不存在", err.Error())return}void_R1, err := handle.FindProc("void_R1")if err != nil {fmt.Println("void_R1 不存在", err.Error())return}void_R2, err := handle.FindProc("void_R2")if err != nil {fmt.Println("void_R2 不存在", err.Error())return}uint8_R1, err := handle.FindProc("uint8_R1")if err != nil {fmt.Println("uint8_R1 不存在", err.Error())return}uint8_R1_free, err := handle.FindProc("uint8_R1_free")if err != nil {fmt.Println("uint8_R1_free 不存在", err.Error())return}setCallBackFun, err := handle.FindProc("setCallBackFun")if err != nil {fmt.Println("setCallBackFun 不存在", err.Error())return}fmt.Println("--------------------------函数加载成功-------------------------")// -------------------------------------------------------------------------fmt.Println("---- void_R0")fmt.Println(void_R0.Addr())void_R0.Call()// -------------------------------------------------------------------------fmt.Println("\r\n\r\n---- void_R1")fmt.Println(void_R1.Addr())name := C.CString("li_jian_xing")void_R1.Call((uintptr)(unsafe.Pointer(name)))C.free(unsafe.Pointer(name))// -------------------------------------------------------------------------// 创建数组，传入char** 取出C函数中的数据fmt.Println("\r\n\r\n---- void_R2")fmt.Println(void_R2.Addr())arg := make([]C.char, 1024)name = C.CString("li_jian_xing")void_R2.Call((uintptr)(unsafe.Pointer(name)), (uintptr)(unsafe.Pointer((&arg))))C.free(unsafe.Pointer(name))fmt.Println(C.GoString(&arg[0]))// -------------------------------------------------------------------------// 传入char** 取出C函数分配的内存，处理完再释放fmt.Println("\r\n\r\n---- uint8_R1")fmt.Println(uint8_R1.Addr())var argc *C.charuint8_R1.Call((uintptr)(unsafe.Pointer(&argc)))fmt.Println(C.GoString(argc))uint8_R1_free.Call((uintptr)(unsafe.Pointer(&argc)))// -------------------------------------------------------------------------// 向dll 函数设定回调fmt.Println("\r\n\r\n---- setCallBackFun")fmt.Println(setCallBackFun.Addr())setCallBackFun.Call((uintptr)(unsafe.Pointer(C.CallBackFun)))handle.Release() // 释放dll 句柄}