VS2019编译MQTT库 C/C++（超详细，含示例工程）

谁借莪１个温暖的怀抱￠ 2023-07-01 10:55 3阅读 0赞

**目录**

前言

一、前期准备

1.1 获取mqtt库

1.2 安装openssl

1.3 安装cmake-gui

二、生成C工程代码

三、编译C库

3.1 创建工程目录

3.2 修改输出目录

四、生成C++工程代码

五、编译C++库

5.1 创建工程目录

5.2 修改输出目录

六、新建MQTT工程

6.1 创建文件夹

6.2 拷贝所需头文件和库文件

七、配置工程

7.1 配置预处理器

7.2 包含头文件目录

7.3 包含lib目录

7.4 添加依赖项lib库

八、报错

8.1 没有正确配置预处理器

8.2 缺少paho-mqttpp3.lib

8.3 缺少ws2\_32.lib库

8.4 找不到paho-mqttpp3.dll

九、参考资料

十、示例工程下载

--------------------

# 前言 #

最近C++编程，需要用到mqtt，之前python编程时用到的mqtt库时paho的，于是乎，上GitHub找了paho的mqtt的c源码库。

**编程环境：win10**

**工具：Visual Studio 2019**

由于网上看到的教程是VS2015的，没有VS2019的，而且好像编译过程也有点不一样，因此写下这篇笔记，当作给自己的记录。也可以给其他人参考一下。

# 一、前期准备 #

## 1.1 获取mqtt库 ##

先git clone下来[GitHub - eclipse/paho.mqtt.c: An Eclipse Paho C client library for MQTT for Windows, Linux and MacOS. API documentation: https://eclipse.github.io/paho.mqtt.c/][GitHub - eclipse_paho.mqtt.c_ An Eclipse Paho C client library for MQTT for Windows_ Linux and MacOS. API documentation_ https_eclipse.github.io_paho.mqtt.c]

[GitHub - eclipse/paho.mqtt.cpp][GitHub - eclipse_paho.mqtt.cpp]

我把源码下载在**F:/学习笔记/C++/**目录下，这里时两个库，一个是C源码库，一个是cpp源码库，cpp源码库的编译要基于c源码库。

## 1.2 安装openssl ##

Windows要安装openssl，选择开发人员版本的openssl进行下载（即那个比较大的安装包）

[https://slproweb.com/download/Win64OpenSSL-1\_1\_1d.exe][https_slproweb.com_download_Win64OpenSSL-1_1_1d.exe]

我把openssl安装在**C:/Program Files/OpenSSL-Win64/**

--------------------

**PS:**

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5pS75Z-O54uu55m9546J_size_9_color_FFFFFF_t_70_g_se_x_16][]

根据粉丝私聊我要上述openssl安装包后，成功跑通本教程，才发现，这里有个openssl的报错是要用到这个对应的openssl才能解决。

鉴于上面这个openssl版本已经下载不了，我已经把对应的程序下载链接放出来

有积分的同学，请戳

[openssl\_1.1.1d.zip-网络安全文档类资源-CSDN下载][openssl_1.1.1d.zip-_-CSDN]

没有积分的同学，请戳

[https://pan.baidu.com/s/1me6ayn7PYi6NHER5miOGOQ][https_pan.baidu.com_s_1me6ayn7PYi6NHER5miOGOQ] 提取码:c7iy

--------------------

## 1.3 安装cmake-gui ##

安装包地址

[https://github.com/Kitware/CMake/releases/download/v3.16.2/cmake-3.16.2-win64-x64.msi][https_github.com_Kitware_CMake_releases_download_v3.16.2_cmake-3.16.2-win64-x64.msi]

# 二、生成C工程代码 #

源码目录选择，paho.mqtt.c目录，**F:/学习笔记/C++/mqtt/paho.mqtt.c**

源码生成build目录选择你自己要生成的目录路径，这里我是在源码目录下新建了一个build目录

**F:/学习笔记/C++/paho.mqtt.c/build**

![20200121124630448.png][]

选择好路径之后，点击“configure”

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70][]

按下图打勾，然后点击“configure”

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 1][]

会报错如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 2][]

这是因为缺少openssl的路径，如下图，添加好openssl对应的文件目录

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 3][]

OPENSSL\_CRYPTO\_LIB=C:/Program Files/OpenSSL-Win64/lib/libcrypto.lib

OPENSSL\_INCLUDE\_DIR=C:/Program Files/OpenSSL-Win64/include

OPENSSL\_LIB=C:/Program Files/OpenSSL-Win64/lib/libssl.lib

**C:/Program Files/OpenSSL-Win64/**是我的openssl安装目录

选择完成后重新“Configure”就不会报错了，然后接着点“Generate”

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 4][]

你会发现在你的build目录下已经生成了一个工程了。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 5][]

# 三、编译C库 #

## 3.1 创建工程目录 ##

在源码目录下创建新的文件夹**install/bin/**

既是**F:\\学习笔记\\C++\\paho.mqtt.c\\install\\bin**

所有生成的文件都放在\\install\\bin

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 6][]

## 3.2 修改输出目录 ##

双击打开Eclipse Paho C.sln

然后右键每个子项目，把路径给修改成为刚刚新创建的install/bin/这个目录下面，当然你可以自定义你的目录，但是必须确保你的输出文件都在同一个目录下面。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 7][]

配置完成之后右键All Build进行生成

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 8][]

在此处打开powershell窗口，运行MQTTVersion.exe

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 9][]

在原来的窗口输入.\\paho\_c\_sub.exe -t "baiyu" -h test.mosquitto.org

新建一个窗口，输入.\\paho\_c\_pub.exe -t "baiyu" -h test.mosquitto.org

然后新窗口发送的数据可以直接在原来窗口接收到。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 10][]

至此，paho-mqtt-c库和例程编译完成。

# 四、生成C++工程代码 #

生成C++工程代码与生成C工程代码方法类似。都是在原来的源代码目录下面新建一个build目录

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 11][]

会报错如下图所示，这是因为生成C++库需要用到上面生成的C的lib库

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 12][]

**F:/****学习笔记/C++/paho.mqtt.c/src** 这个目录是源码头文件的库

**F:/****学习笔记/C++/paho.mqtt.c/install/bin/paho-mqtt3as.lib**   这个lib是c编译出来的库

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 13][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 14][]

然后点击“Generate”进行生成

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 15][]

# 五、编译C++库 #

## 5.1 创建工程目录 ##

同样是在源代码目录下面新建一个install/bin目录

## 5.2 修改输出目录 ##

然后打开工程paho-mqtt-cpp.sln

![20200121125016877.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 16][]

修改完毕进行All build进行编译生成

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 17][]

设为启动项目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 18][]

![20200121125109799.png][]

运行后会在等待消息的到来，打开咱们一开始的那个发布消息的窗口，发送消息，你就可以收到了，这说明你的C++客户端编译成功了。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 19][]

# 六、新建MQTT工程 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 20][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 21][]

## 6.1 创建文件夹 ##

进入工程目录下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 22][]

在**include**目录下新建两个文件夹

![20200121125200473.png][]

## 6.2 拷贝所需头文件和库文件 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 23][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 24][]

在lib目录下，

添加paho-mqtt3as.lib

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 25][]

添加paho-mqttpp3.lib

![20200121125248786.png][]

# 七、配置工程 #

## 7.1 配置预处理器 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 26][]

## 7.2 包含头文件目录 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 27][]

## 7.3 包含lib目录 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 28][]

## 7.4 添加依赖项lib库 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 29][]

新建文件，然后把paho.mqtt.cpp的async\_consume.cpp源码拷贝过来，右键生成，进行编译

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 30][]

然后调试运行

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 31][]

说明新建的工程起作用了！！！

自己要调用mqtt的库就这么做即可。

# 八、报错 #

## 8.1 没有正确配置预处理器 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 32][]

![20200121125505757.png][]

配置好预处理器 “WIN64”即可

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 33][]

## 8.2 缺少paho-mqttpp3.lib ##

错误，LNK2019 无法解析的外部符号 "public: \_\_cdecl mqtt::connect\_options::connect\_options(void)" (??0connect\_options@mqtt@@QEAA@XZ)，该符号在函数 main 中被引用

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 34][]

问题：缺少paho-mqttpp3.lib

解决方法：文件最开始的位置添加\#pragma comment(lib, " paho-mqttpp3.lib ")

或者“右键工程->属性->链接器->输入->附加依赖项”

## 8.3 缺少ws2\_32.lib库 ##

错误      LNK2019      无法解析的外部符号 \_\_imp\_htons，该符号在函数 WebSocket\_close 中被引用

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 35][]

解决方法：在文件最开始的位置添加\#pragma comment(lib, "ws2\_32.lib")

或者“右键工程->属性->链接器->输入->附加依赖项”

## 8.4 找不到paho-mqttpp3.dll ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 36][]

解决方法：

在你编译cpp源码时，会生成paho-mqttpp3.dll

我的paho-mqttpp3.dll所在目录是

**F:\\****学习笔记\\C++\\paho.mqtt.cpp\\install\\bin**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaDc2Mzk4NDAxNw_size_16_color_FFFFFF_t_70 37][]

# 九、参考资料 #

[MQTT什么鬼？第四讲：编译Paho C Windows客户端 – 砖瓦匠][MQTT_Paho C Windows_ _]

# 十、示例工程下载 #

鉴于有些小伙伴编译不成功，故把工程打包上传，供大家学习交流。不过，我还是希望大家能按着教程自己动手编译一次。

教程中的编译好的C库工程：

[VS2019编译完成的paho.mqtt.c库\_paho.mqtt.c编译-C代码类资源-CSDN下载][VS2019_paho.mqtt.c_paho.mqtt.c_-C_-CSDN]

教程中的编译好的C库工程：

[VS2019编译完成的paho.mqtt.cpp库\_paho-mqtt-c编译使用-C++代码类资源-CSDN下载][VS2019_paho.mqtt.cpp_paho-mqtt-c_-C_-CSDN]

没有积分下载的小伙伴请戳下面的链接：

[GitHub - BaiYu96/VS2019\_paho.mqtt.c: This is a VS2019 project of the paho.mqtt.c][GitHub - BaiYu96_VS2019_paho.mqtt.c_ This is a VS2019 project of the paho.mqtt.c]

[GitHub - BaiYu96/VS2019\_paho.mqtt.cpp: This is the paho.mqtt.cpp project compiled by VS2019.][GitHub - BaiYu96_VS2019_paho.mqtt.cpp_ This is the paho.mqtt.cpp project compiled by VS2019.]

当然，我希望有积分的小伙伴支持一下我，嘻嘻，觉得有帮助就给我点个赞，或者留个言吧~

[GitHub - eclipse_paho.mqtt.c_ An Eclipse Paho C client library for MQTT for Windows_ Linux and MacOS. API documentation_ https_eclipse.github.io_paho.mqtt.c]: https://github.com/eclipse/paho.mqtt.c.git
[GitHub - eclipse_paho.mqtt.cpp]: https://github.com/eclipse/paho.mqtt.cpp.git
[https_slproweb.com_download_Win64OpenSSL-1_1_1d.exe]: https://slproweb.com/download/Win64OpenSSL-1_1_1d.exe
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5pS75Z-O54uu55m9546J_size_9_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/20210927232534430.png?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBA5pS75Z-O54uu55m9546J,size_9,color_FFFFFF,t_70,g_se,x_16
[openssl_1.1.1d.zip-_-CSDN]: https://download.csdn.net/download/zhh763984017/22345427
[https_pan.baidu.com_s_1me6ayn7PYi6NHER5miOGOQ]: https://pan.baidu.com/s/1me6ayn7PYi6NHER5miOGOQ
[https_github.com_Kitware_CMake_releases_download_v3.16.2_cmake-3.16.2-win64-x64.msi]: https://github.com/Kitware/CMake/releases/download/v3.16.2/cmake-3.16.2-win64-x64.msi
[20200121124630448.png]: https://img-blog.csdnimg.cn/20200121124630448.png
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[MQTT_Paho C Windows_ _]: http://www.brixbot.com/coding/mqtt-04-build-paho-c-for-windows/
[VS2019_paho.mqtt.c_paho.mqtt.c_-C_-CSDN]: https://download.csdn.net/download/zhh763984017/12195113
[VS2019_paho.mqtt.cpp_paho-mqtt-c_-C_-CSDN]: https://download.csdn.net/download/zhh763984017/12195122
[GitHub - BaiYu96_VS2019_paho.mqtt.c_ This is a VS2019 project of the paho.mqtt.c]: https://github.com/BaiYu96/VS2019_paho.mqtt.c
[GitHub - BaiYu96_VS2019_paho.mqtt.cpp_ This is the paho.mqtt.cpp project compiled by VS2019.]: https://github.com/BaiYu96/VS2019_paho.mqtt.cpp