| C++ 与 Matlab协作使用比较复杂,逐步学习积累记录,侧重于在C++程序中调用MatLab接口。 环境Ubuntu 20.04VS Code
 Matlab R2021a for Linux
 
 1. 在 C/C++ 程序中读取和写入 MATLAB 数据1.1 头文件Matlab自带供C/C++语言使用的头文件,可在Matlab命令框中输入以下命令来确定其路径, >> extern_path = [matlabroot '/extern/include']
  然后将头文件路径添加到C++程序中,此外还需要在编译时设置链接,生成可执行文件
 g++  -I/usr/local/Matlab/R2021a/extern/include -L/usr/local/Matlab/R2021a/bin/glnxa64 -cpp [需要编译的cpp文件].cpp -o main -lmat -lmx -Wl,-rpath /usr/local/Matlab/R2021a/bin/glnxa64
 使用cmake编译程序的话,CMakeLists.txt文件内容如下,此处编译文件mat_test.cpp cmake_minimum_required(VERSION 3.16)
project(manager_system)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -Wall") # 指定cmake在调用g++编译时的一些输入参数。-g 的作用是编译生成可调式的输出文件,-wall是输出警告信息,-o2这里指的是编译优化
add_subdirectory(src)
include_directories(
    ${CMAKE_SOURCE_DIR}/include
    "/usr/local/Matlab/R2021a/extern/include"
    )
LINK_DIRECTORIES("/usr/local/Matlab/R2021a/bin/glnxa64")
LINK_LIBRARIES("/usr/local/Matlab/R2021a/bin/glnxa64/libeng.so"
    "/usr/local/Matlab/R2021a/bin/glnxa64/libmx.so"
    "/usr/local/Matlab/R2021a/bin/glnxa64/libmat.so")
add_executable(mat_test ${CMAKE_SOURCE_DIR}/src/mat_test.cpp) # 生成可执行文件
target_link_libraries(mat_test SRC) # 将SRC库和main可执行文件链接在一起
set( CMAKE_INSTALL_PREFIX "${CMAKE_SOURCE_DIR}/bin/")
install(TARGETS mat_test RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX}) # 这两行将执行文件安装在/bin文件夹下,在/build文件夹下使用命令'make install'
 则可以在C++代码中调用Matlab有关的C/C++头文件,如 #include <mat.h>
 https://www.cnblogs.com/excellentlhw/p/12009924.htmlMatlab官方相关函数介绍
 1.2 C MAT 文件 API使用介绍1.打开mat文件 
 #include <mat.h>
MATFile *matOpen(const char *filename, const char *mode);
 参数 filename要打开的mat文件的名称
 mode打开mat文件的工作模式,有以下几种:
 | 模式 | 意义 | 
|---|
 | r | Opens file for reading only; determines the current version of the MAT-file by inspecting the files and preserves the current version. |  | u | Opens file for update, both reading and writing. If the file does not exist, does not create a file (equivalent to the r+ mode of fopen). Determines the current version of the MAT-file by inspecting the files and preserves the current version. |  | w | Opens file for writing only; deletes previous contents, if any. | 
 返回值代表mat文件的指针
 |