Converting Python Objects to C in .NET framework

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Converting Python Objects to C
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A major problem with embedded use of the interpreter is converting the result of a Python function or method call into a suitable C representation As a general rule, you need to know in advance exactly what kind of data an operation is going to return Sadly, there is no high-level convenience function like PyArg_ParseTuple() for converting a single object value However, the following lists some low-level conversion functions that will convert a few primitive Python data types into an appropriate C representation as long as you know exactly what kind of Python object you are working with:
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long PyInt_AsLong(PyObject *) long PyLong_AsLong(PyObject *) double PyFloat_AsDouble(PyObject *) char *PyString_AsString(PyObject *) (Python 2 only) char *PyBytes_AsString(PyObject *) (Python 3 only)
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For any types more complicated than this, you will need to consult the C API documentation (http://docspythonorg/c-api)
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26 Extending and Embedding Python
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The ctypes module provides Python with access to C functions defined in DLLs and shared libraries Although you need to know some details about the underlying C library (names, calling arguments, types, and so on), you can use ctypes to access C code without having to write C extension wrapper code or compile anything with a C compiler ctypes is a sizable library module with a lot of advanced functionality Here, we cover the essential parts of it that are needed to get going
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Loading Shared Libraries
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The following classes are used to load a C shared library and return an instance representing its contents:
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CDLL(name [, mode [, handle [, use_errno [, use_last_error]]]])
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A class representing a standard C shared library name is the name of the library such as 'libcso6' or 'msvcrtdll' mode provides flags that determine how the library is loaded and are passed to the underlying dlopen() function on UNIX It can be set to the bitwise-or of RTLD_LOCAL, RTLD_GLOBAL, or RTLD_DEFAULT (the default) On Windows, mode is ignored handle specifies a handle to an already loaded library (if available) By default, it is None use_errno is a Boolean flag that adds an extra layer of safety around the handling of the C errno variable in the loaded libraryThis layer saves a thread-local copy of errno prior to calling any foreign function and restores the value afterwards By default, use_errno is False use_last_error is a Boolean flag that enables a pair of functions get_last_error() and set_last_error() that can be used to manipulate the system error codeThese are more commonly used on Windows By default, use_last_error is False
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WinDLL(name [, mode [, handle [, use_errno [, use_last_error]]]])
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The same as CDLL() except that the functions in the library are assumed to follow the Windows stdcall calling conventions (Windows) The following utility function can be used to locate shared libraries on the system and construct a name suitable for use as the name parameter in the previous classes It is defined in the ctypesutil submodule:
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find_library(name)
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Defined in ctypesutil Returns a path name corresponding to the library name name is a library name without any file suffix such as 'libc', 'libm', and so on The string returned by the function is a full path name such as '/usr/lib/libcso6' The behavior of this function is highly system-dependent and depends on the underlying configuration of shared libraries and environment (for example, the setting of LD_LIBRARY_PATH and other parameters) Returns None if the library can t be located
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The shared library instances created by the CDLL() class operates as a proxy to the underlying C libraryTo access library contents, you just use attribute lookup (the operator) For example:
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Embedding the Python Interpreter
>>> import ctypes >>> libc = ctypesCDLL("/usr/lib/libcdylib") >>> libcrand() 16807 >>> libcatoi("12345") 12345 >>>
In this example, operations such as libcrand() and libcatoi() are directly calling functions in the loaded C library ctypes assumes that all functions accept parameters of type int or char * and return results of type intThus, even though the previous function calls worked, calls to other C library functions do not work as expected For example: