Python

execute_process(COMMAND${PYTHON_EXECUTABLE}

print(Hello,

_hello_worldERROR_QUIETOUTPUT_STRIP_TRAILING_WHITESPACE

message(STATUS

_hello_world)上面的代码最核心的有两句。

find_package

用来查找

执行完后会自动生成一系列的变量我们可以在后面的代码中使用这些变量。

PYTHONINTERP_FOUND,

对当前系统做很多探测根据系统的情况生成最适合的代码。

或者我们的代码里有很多重复的地方。

用python可以快速生成这些重复的代码。

python

PYTHON_EXECUTABLE/custom/location/python检测

Python

*/Py_Initialize();PyRun_SimpleString(from

time

is,ctime(time())\n);Py_Finalize();return

3.5

${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}

EXACT

add_executable(hello-embedded-python

hello-embedded-python.c)target_include_directories(hello-embedded-python

PRIVATE

)target_link_libraries(hello-embedded-python

PRIVATE

2024第一行是因为我没有设置环境变量这个程序找不到我电脑里的python。

但是这个并不影响程序运行。

Python

https://docs.python.org/3.5/extending/embedding.html#pure-embedding*/#include

Python.hint

1;}Py_Initialize();PyRun_SimpleString(import

sys);PyRun_SimpleString(sys.path.append(\.\));pName

PyUnicode_DecodeFSDefault(argv[1]);/*

Error

PyImport_Import(pName);Py_DECREF(pName);if

(pModule

PyObject_GetAttrString(pModule,

argv[2]);/*

{Py_DECREF(pArgs);Py_DECREF(pModule);fprintf(stderr,

Cannot

PyLong_AsLong(pValue));Py_DECREF(pValue);}

else

{Py_DECREF(pFunc);Py_DECREF(pModule);PyErr_Print();fprintf(stderr,

Call

(PyErr_Occurred())PyErr_Print();fprintf(stderr,

Cannot

argv[2]);}Py_XDECREF(pFunc);Py_DECREF(pModule);}

else

set(CMAKE_CXX_STANDARD_REQUIRED

ON)

${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}

EXACT

execute_process(COMMAND${PYTHON_EXECUTABLE}

import

print(re.compile(/__init__.py.*).sub(,numpy.__file__))RESULT_VARIABLE

_numpy_locationERROR_QUIETOUTPUT_STRIP_TRAILING_WHITESPACE)

if(NOT

execute_process(COMMAND${PYTHON_EXECUTABLE}

import

print(numpy.__version__)OUTPUT_VARIABLE

_numpy_versionERROR_QUIETOUTPUT_STRIP_TRAILING_WHITESPACE)include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(NumPyFOUND_VAR

NumPyVERSION_VAR

_numpy_version)这一段代码主要有2部分组成。

首先是判断有没有安装

execute_process(COMMAND${PYTHON_EXECUTABLE}

import

print(re.compile(/__init__.py.*).sub(,numpy.__file__))RESULT_VARIABLE

_numpy_locationERROR_QUIETOUTPUT_STRIP_TRAILING_WHITESPACE)if(NOT

${_numpy_location}

execute_process(COMMAND${PYTHON_EXECUTABLE}

import

print(numpy.__version__)OUTPUT_VARIABLE

_numpy_versionERROR_QUIETOUTPUT_STRIP_TRAILING_WHITESPACE)版本号保存到

_numpy_version

变量。

这里使用FindPackageHandleStandardArgs

NumPy

include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(NumPy

FOUND_VAR

Py${PYTHON_VERSION_MAJOR}-pure-embedding.cpp

target_include_directories(pure-embedding

PRIVATE

target_link_libraries(pure-embedding

PRIVATE

add_custom_command(OUTPUT${CMAKE_CURRENT_BINARY_DIR}/use_numpy.pyCOMMAND${CMAKE_COMMAND}

copy_if_different

${CMAKE_CURRENT_SOURCE_DIR}/use_numpy.py${CMAKE_CURRENT_BINARY_DIR}/use_numpy.pyDEPENDS${CMAKE_CURRENT_SOURCE_DIR}/use_numpy.py)#

make

target_sources(pure-embeddingPRIVATE${CMAKE_CURRENT_BINARY_DIR}/use_numpy.py)

编译生成