建立一个跨平台可复用C++代码的实例工程（windows vs2017,android studio 可用）

H:\DEVTOOLS\project\git\Shot4Read>dir
 驱动器 H 中的卷没有标签。
 卷的序列号是 CC73-754C

 H:\DEVTOOLS\project\git\Shot4Read 的目录

2019-07-02  16:37    <DIR>          .
2019-07-02  16:37    <DIR>          ..
2019-07-02  18:45               419 .gitignore
2019-07-02  18:36    <DIR>          ddmcore
2019-06-28  16:54    <DIR>          Prj.Android
2019-07-02  17:04    <DIR>          Prj.Windows
               1 个文件            419 字节
               6 个目录 11,622,670,336 可用字节

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)
set(CMAKE_VERBOSE_MAKEFILE ON)

# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.


#定义CASSDK位置 // 这里就是导入复用的c/c++代码目录。
if(NOT DDMCORE_DIR)
    set( DDMCORE_DIR ${CMAKE_SOURCE_DIR}/../../../../../ddmcore)
endif()
if( IS_DIRECTORY ${DDMCORE_DIR} )
    # Add header file include directories
    include_directories(${DDMCORE_DIR})#添加多目录的路径
    # Add block directories
    # 第二个cassdk.out参数用于指定外部文件夹在输出文件夹中的位置
    add_subdirectory( ${DDMCORE_DIR} cassdk.out)
else()
    message(FATAL_ERROR   "INVALID FOLDER 'CASSDK_DIR'=${DDMCORE_DIR}" )
endif()






add_library( # Sets the name of the library.
        native-lib

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        native-lib.cpp)

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
        log-lib


        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log)

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
        native-lib
        ddmcore-lib
        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)
set(CMAKE_VERBOSE_MAKEFILE ON)

# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.




add_library( # Sets the name of the library.
        ddmcore-lib ##引入ddmcore库

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        apitest.cpp)

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
        log-lib


        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log)

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
        ddmcore-lib #连接ddmcore-lib。
        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})