在windows上使用go编译dll文件，供C++调用

C++项目是win32的，所以go的编译环境也要改成win32的

cmd下，修改环境变量： set GOARCH=386 set CGO_ENABLED=1 使用go env 查看是否生效

参考：https://bbs.csdn.net/topics/394513992.
2. 安装编译环境
MinGW下载安装gcc,g++编译器
参考：https://blog.csdn.net/cbb944131226/article/details/82940273
3. 编写go相关文件和代码
编写def文件
比如我要编译的dll文件，导出函数为GetIP
那么编写一个 godll.def (名字随便起)
godll.def

EXPORTSGetIP package mainimport "C"import ("bytes""crypto/cipher""crypto/des""encoding/hex""fmt""io""math/rand""net/http""strings""time" )func EncryptDES_ECB(src, key string) string {data := []byte(src)keyByte := []byte(key)block, err := des.NewCipher(keyByte)if err != nil {panic(err)}bs := block.BlockSize()//对明文数据进行补码data = PKCS5Padding(data, bs)if len(data)%bs != 0 {panic("Need a multiple of the blocksize")}out := make([]byte, len(data))dst := outfor len(data) > 0 {//对明文按照blocksize进行分块加密//必要时可以使用go关键字进行并行加密block.Encrypt(dst, data[:bs])data = data[bs:]dst = dst[bs:]}return fmt.Sprintf("%X", out) }func DecryptDES_ECB(src, key string) string {data, err := hex.DecodeString(src)if err != nil {panic(err)}keyByte := []byte(key)block, err := des.NewCipher(keyByte)if err != nil {panic(err)}bs := block.BlockSize()if len(data)%bs != 0 {panic("crypto/cipher: input not full blocks")}out := make([]byte, len(data))dst := outfor len(data) > 0 {block.Decrypt(dst, data[:bs])data = data[bs:]dst = dst[bs:]}out = PKCS5UnPadding(out)return string(out) }func EncryptDES_CBC(src, key string) string {data := []byte(src)keyByte := []byte(key)block, err := des.NewCipher(keyByte )if err != nil {panic(err)}data = PKCS5Padding(data , block.BlockSize())//获取CBC加密模式iv := keyByte //用密钥作为向量(不建议这样使用)mode := cipher.NewCBCEncrypter(block, iv)out := make([]byte, len(data))mode .CryptBlocks(out, data)return fmt.Sprintf("%X", out) }func DecryptDES_CBC(src, key string) string {keyByte := []byte(key)data, err := hex.DecodeString(src)if err != nil {panic(err)}block, err := des.NewCipher(keyByte)if err != nil {panic(err)}iv := keyByte //用密钥作为向量(不建议这样使用)mode := cipher.NewCBCDecrypter(block, iv)plaintext := make([]byte, len(data))mode.CryptBlocks(plaintext, data)plaintext = PKCS5UnPadding(plaintext)return string(plaintext) }func PKCS5Padding(ciphertext []byte, blockSize int) []byte {padding := blockSize - len(ciphertext)%blockSizepadtext := bytes.Repeat([]byte{byte(padding)}, padding)return append(ciphertext, padtext...) }func PKCS5UnPadding(origData []byte) []byte {length := len(origData)unpadding := int(origData[length-1])return origData[:(length - unpadding)] }func Get(url string) string {// 超时时间：5秒client := &http.Client{Timeout: 5 * time.Second}resp, err := client.Get(url)defer resp.Body.Close()if err != nil {//panic(err)//fmt.Println(err.Error())return "networkError"}var buffer [512]byteresult := bytes.NewBuffer(nil)for {n, err := resp.Body.Read(buffer[0:])result.Write(buffer[0:n])if err != nil && err == io.EOF {break} else if err != nil {//panic(err)result = bytes.NewBuffer([]byte("networkError"))}}return result.String() }//export GetIP func GetIP(signal int32, domainParam string) *C.char {defer func() {err := recover()if err != nil {//fmt.Println(err)}}()if signal != 8956142 { // 做一下验证防止被 恶意调用return C.CString("authError")}key := "xxxxxxxwww"domain := "xxx.com"//domain := "xxxx.cn"enc_str := EncryptDES_ECB(domain, key)httpDnsUrl := "http://xxxxx/d?dn=" + enc_str + "&id=888&ttl=1"respTxt := Get(httpDnsUrl)if respTxt == "networkError" {return C.CString("networkError")}descStr := DecryptDES_ECB(respTxt, key)ips_str := strings.Split(descStr, ",")[0]ips_slice := strings.Split(ips_str, ";")ips_length := len(ips_slice)if ips_length == 1 {return C.CString(ips_slice[0])} else {rand.Seed(time.Now().Unix())index := rand.Intn(ips_length)return C.CString(ips_slice[index])} }func main() {}

注意：在要导出的函数（GetIP）上面 写上 //export GetIP， 还要有main函数

实际上我应该将 C.CString 创建的内存，释放掉。
参考：
https://blog.csdn.net/weixin_34128501/article/details/91709373
https://blog.csdn.net/liangguangchuan/article/details/52920054
https://blog.csdn.net/qq_30549833/article/details/86157744

编译dll文件

go build -buildmode=c-archive httpdns.go gcc godll.def httpdns.a -shared -lwinmm -lWs2_32 -o httpdns.dll -Wl,--out-implib,httpdns.lib

生成 .dll .lib. h文件

用C++调用， vs2017 （需要用到上面的.dll 和.h）

#include "pch.h" #include <iostream> #include <Windows.h> #include <stdio.h> #include "httpdns.h" // dll的头文件 // 其中 httpdns.h里面的 //typedef __SIZE_TYPE__ GoUintptr; //typedef float _Complex GoComplex64; //typedef double _Complex GoComplex128; 这三行要注释掉// 根据httpdns.h 里面导出函数定义下面类型 typedef char*(*funcPtrGetIP)(GoInt32, GoString); using namespace std; int main() {//加载动态库HINSTANCE hInstance = LoadLibrary("httpdns.dll");funcPtrGetIP pFunc_GetIP = (funcPtrGetIP)GetProcAddress(hInstance, "GetIP");int signal = 8956142;char* domain = const_cast<char *>("xxx.com");GoString gostr_domain{ domain,(ptrdiff_t)strlen(domain) };//就是go中的string类型char* ipstr = pFunc_GetIP(signal, gostr_domain);cout << strlen(ipstr) << endl;cout << ipstr << endl;//FreeLibrary(hInstance); //release模式会崩溃，原因未知return 0; }

----2020-12-29----
补充下：
关于在go中使用C.String后，内存需要释放的，写一个释放内存的接口

/* #include <stdio.h> #include <stdlib.h> */ import "C"//export FreeDecryUserKey func FreeDecryUserKey(pointer *C.char) {fmt.Println("will free pointer ")fmt.Println(pointer)C.free(unsafe.Pointer(pointer))//释放内存 必须引入stdlib.h 标准库 }

在Cpp中这样使用

#include <iostream> #include <string> #include <Windows.h> #include "aesdecry.h" using namespace std;typedef char*(*funcPtrGetDecryUserKey)(GoString, GoString); typedef void (*funcPtrFreeDecryUserKey)(char*);int main() {std::string user_base64_key = "1a07b51b220c5083ede4903cf0e1da88823e8134eb81b6a78396234a6de8d06de6f94a55d0e8762849ae58c70d436217";HINSTANCE hInstance = LoadLibrary("main.dll");funcPtrGetDecryUserKey pFunc_GetDecryUserKey = (funcPtrGetDecryUserKey)GetProcAddress(hInstance, "GetDecryUserKey");funcPtrFreeDecryUserKey pFunc_FreeDecryUserKey = (funcPtrFreeDecryUserKey)GetProcAddress(hInstance, "FreeDecryUserKey");char* encry_data = const_cast<char *>(user_base64_key.c_str());char* password = const_cast<char *>("aa6e8b08e4db270c");GoString gostr_encry_data{ encry_data,(ptrdiff_t)strlen(encry_data) };//就是go中的string类型GoString gostr_password{ password,(ptrdiff_t)strlen(password) };//就是go中的string类型char* real_user_key = pFunc_GetDecryUserKey(gostr_encry_data, gostr_password);printf("%x\n", real_user_key);printf("%p\n", real_user_key);std::string targetkey = real_user_key;cout << targetkey << endl;pFunc_FreeDecryUserKey(real_user_key); // 释放掉内存cout << targetkey << endl;return 0; } 创作挑战赛新人创作奖励来咯，坚持创作打卡瓜分现金大奖

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