Python C API
C, C++ 2018. 11. 21. 15:52 |반응형
가장 간단하게 Python을 C에 embed 시키는 방법은 Very High Level interface를 사용 하는 것이다. VHL interface는 어플리케이션과 직접적인 상관 없이 Python script를 실행하기 위한 것이다.
관련 문서
우선 Python C API 관련 Include, Library 디렉토리를 프로젝트에 추가한다.
파이썬 공식 홈페이지에서 다운 받은 파이썬 인스톨러 패키지를 설치 했다면 Solution Configurations를 Release로 설정 한다. Debug 모드로 build 할 경우 pythonXX_d.lib를 찾을 수 없다는 에러가 발생한다. pythonXX_d.lib 파일을 생성하려면 파이썬 소스를 받아서 직접 컴파일해야 한다.
예제:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #pragma comment(lib, "python36.lib") #include <Python.h> int main(int argc, char *argv[]) { wchar_t *program = Py_DecodeLocale(argv[0], NULL); // Decode a byte string from the locale encoding with the surrogateescape error handler: // undecodable bytes are decoded as characters in range U+DC80..U+DCFF. If a byte sequence // can be decoded as a surrogate character, escape the bytes using the surrogateescape error // handler instead of decoding them. // Return a pointer to a newly allocated wide character string, use PyMem_RawFree() to free // the memory. If size is not NULL, write the number of wide characters excluding the null // character into *size if (program == NULL) { fprintf(stderr, "Fatal error: cannot decode argv[0]\n"); exit(1); } Py_SetProgramName(program); /* optional but recommended */ // This function should be called before Py_Initialize() is called for the first time, if it // is called at all.It tells the interpreter the value of the argv[0] argument to the main() // function of the program(converted to wide characters).This is used by Py_GetPath() and some // other functions below to find the Python run - time libraries relative to the interpreter // executable. Py_Initialize(); // Initialize the Python interpreter. In an application embedding Python, this should be called // before using any other Python/C API functions if (Py_IsInitialized()) // Return true (nonzero) when the Python interpreter has been initialized, false (zero) if not. // After Py_FinalizeEx() is called, this returns false until Py_Initialize() is called again. { PyRun_SimpleString("print('Hello Python')"); // This is a simplified interface to PyRun_SimpleStringFlags(), leaving the PyCompilerFlags* // argument set to NULL. PyRun_SimpleString("from time import time, ctime\n" "print('Today is', ctime(time()))\n"); //PyRun_SimpleString("from time import time, ctime\nprint('Today is', ctime(time()))\n"); if (Py_FinalizeEx() < 0) // Undo all initializations made by Py_Initialize() and subsequent use of Python/C API // functions, and destroy all sub-interpreters that were created and not yet destroyed // since the last call to Py_Initialize(). { exit(120); } PyMem_RawFree(program); // Frees the memory block pointed to by p, which must have been returned by a previous call // to PyMem_RawMalloc(), PyMem_RawRealloc() or PyMem_RawCalloc(). // Otherwise, or if PyMem_RawFree(p) has been called before, undefined behavior occurs. // If p is NULL, no operation is performed. } return 0; } | cs |
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