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近期准备开始一个新的项目，主要的内容就是制作一个类似于modbus pull 和modbus slave 的windows软件，可以作为modbus的主站和从站，初步设想是实现modbus tcp 的全部功能。计划使用QT 开发图形化界面，调用libmodbus动态库文件。

https://gitee.com/jeasonb/libmodbus

编译动态库计划使用cmake + mingw 实现。

git clone https://github.com/stephane/libmodbus.git

拿到代码之后可以看一下目录结构，其中最核心的代码就是src 路径下的几个文件

cmake_minimum_required(VERSION 3.1 FATAL_ERROR) ## Set project informationproject(libmodbus LANGUAGES C) # 设置语言include(cmakes/BuildDefaults.cmake) #一些编译选项include_directories(   #添加头文件包含路径    .    ./src/)add_library(modbus SHARED     #关键步骤，设置动态库的文件    ./src/modbus-data.c    ./src/modbus-tcp.c    ./src/modbus-rtu.c    ./src/modbus.c)target_link_libraries(modbus     # 因为是需要依赖socket 所以需要链接windows的socket库                    ws2_32.dll)add_executable(app   #测试的demo  简单的测试函数的功能是否有效    ./test/main.c)target_link_libraries(app modbus)   # 测试代码需要动态链接的库# src targets.

在进行代码迁移的过程中遇到了以下的几个问题，第一个问题是libmodbus 的版本号 未定义，个人猜测这个应该是会用自动运行脚本去将version.h 文件中指定的字段替换，本人懒得去研究自动生成的脚本，就直接将version.h 中的版本号等 随意改了一下。。。。。。。。。

/* * Copyright © 2010-2014 Stéphane Raimbault 
   
     * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */#ifndef MODBUS_VERSION_H#define MODBUS_VERSION_H/* The major version, (1, if %LIBMODBUS_VERSION is 1.2.3) */#define LIBMODBUS_VERSION_MAJOR 1/* The minor version (2, if %LIBMODBUS_VERSION is 1.2.3) */#define LIBMODBUS_VERSION_MINOR 1/* The micro version (3, if %LIBMODBUS_VERSION is 1.2.3) */#define LIBMODBUS_VERSION_MICRO 1/* The full version, like 1.2.3 */#define LIBMODBUS_VERSION        1/* The full version, in string form (suited for string concatenation) */#define LIBMODBUS_VERSION_STRING "1.1.1"/* Numerically encoded version, eg. v1.2.3 is 0x010203 */#define LIBMODBUS_VERSION_HEX ((LIBMODBUS_VERSION_MAJOR << 16) |  \                               (LIBMODBUS_VERSION_MINOR <<  8) |  \                               (LIBMODBUS_VERSION_MICRO <<  0))/* Evaluates to True if the version is greater than @major, @minor and @micro */#define LIBMODBUS_VERSION_CHECK(major,minor,micro)      \    (LIBMODBUS_VERSION_MAJOR > (major) ||               \     (LIBMODBUS_VERSION_MAJOR == (major) &&             \      LIBMODBUS_VERSION_MINOR > (minor)) ||             \     (LIBMODBUS_VERSION_MAJOR == (major) &&             \      LIBMODBUS_VERSION_MINOR == (minor) &&             \      LIBMODBUS_VERSION_MICRO >= (micro)))#endif /* MODBUS_VERSION_H */
   

就是给几个宏定义一个值然后是config.h 就是直接在win32 目录下将对应的config.h 导出来。

#include 
   
    #include "../src/modbus.h"int main(void){
       modbus_t *m_ctx = modbus_new_tcp("127.0.0.1",502);    if(m_ctx)    {
           printf("mctx is created!\r\n");                   }else     {
           printf("m_ctx is null !\r\n");    }    return 0;}
   

关于整个工程，请去gitee 自行下载。更多问题欢迎留言，力所能及范围之内会解答的。

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