For the extended Python C
This paper describes how to extend python with C language. The example is the shear plate, add a string to the Windows settings for python (Clipboard) function. I used to write the following code when the environment is: windows xp, gcc.exe 4.7.2, Python 3.2.3.
The first step is to write the C language DLL
Create a clip.c file, as follows:
// Setting the UNICODE database, it can correctly reproduce wide character set #define UNICODE #include <windows.h> #include <python.h> // Set the text to the clipboard(Clipboard) static PyObject *setclip(PyObject *self, PyObject *args) { LPTSTR lptstrCopy; HGLOBAL hglbCopy; Py_UNICODE *content; int len = 0; // The python UNICODE string and length into the if (!PyArg_ParseTuple(args, "u#", &content, &len)) return NULL; Py_INCREF(Py_None); if (!OpenClipboard(NULL)) return Py_None; EmptyClipboard(); hglbCopy = GlobalAlloc(GMEM_MOVEABLE, (len+1) * sizeof(Py_UNICODE)); if (hglbCopy == NULL) { CloseClipboard(); return Py_None; } lptstrCopy = GlobalLock(hglbCopy); memcpy(lptstrCopy, content, len * sizeof(Py_UNICODE)); lptstrCopy[len] = (Py_UNICODE) 0; GlobalUnlock(hglbCopy); SetClipboardData(CF_UNICODETEXT, hglbCopy); CloseClipboard(); return Py_None; } // Define export to Python method static PyMethodDef ClipMethods[] = { {"setclip", setclip, METH_VARARGS, "Set string to clip."}, {NULL, NULL, 0, NULL} }; // The definition of Python model static struct PyModuleDef clipmodule = { PyModuleDef_HEAD_INIT, "clip", NULL, -1, ClipMethods }; // The initialization of Python model PyMODINIT_FUNC PyInit_clip(void) { return PyModule_Create(&clipmodule); }
The second step is to write Python setup.py
Create a setup.py file, as follows:
from distutils.core import setup, Extension module1 = Extension('clip', sources = ['clip.c']) setup (name = 'clip', version = '1.0', description = 'This is a clip package', ext_modules = [module1])
The third step with Python compiler
Run the following command:
python setup.py build --compiler=mingw32 install
Will prompt the following error in my environment:
gcc: error: unrecognized command line option '-mno-cygwin' error: command 'gcc' failed with exit status 1
Open the %PYTHON installation directory%/Lib/distutils/cygwinccompiler.py file inside the -mno-cygwin, will be deleted, and then you can run.
After normal operation, will generate a clip.pyd file, and copy the file to the %PYTHON installation directory in the%/Lib/site-packages directory
The fourth step to test the extension
Write a test.py, as follows:
# -*- encoding: gbk -*- import clip clip.setclip("Hello am")
Function
python test.py
To any one place paste, you can verify the correctness of.
Posted by Arno at November 25, 2013 - 3:59 PM