The Python global interpreter lock is released before calling anyįunction exported by these libraries, and reacquired afterwards. WinDLL and OleDLL use the standard calling convention on this On Windows CE only the standard calling convention is used, for convenience the WinDLL ( name, mode=DEFAULT_MODE, handle=None, use_errno=False, use_last_error=False ) ¶ If the return value signals aįailure, an WindowsError is automatically raised.
Succeeded, together with additional error code. Values contain information specifying whether the function call failed or Windows only: Instances of this class represent loaded shared libraries,įunctions in these libraries use the stdcall calling convention, and areĪssumed to return the windows specific HRESULT code. OleDLL ( name, mode=DEFAULT_MODE, handle=None, use_errno=False, use_last_error=False ) ¶ Libraries use the standard C calling convention, and are assumed to return Instances of this class represent loaded shared libraries.
CDLL ( name, mode=DEFAULT_MODE, handle=None, use_errno=False, use_last_error=False ) ¶ Way is to instantiate one of the following classes: class ctypes. There are several ways to loaded shared libraries into the Python process. Returns the filename of the library file. ( /sbin/ldconfig, gcc, and objdump) to find the library file. On Linux, find_library() tries to run external programs The exact functionality is system dependent. Is the form used for the posix linker option -l). name is the library name withoutĪny prefix like lib, suffix like. Try to find a library and return a pathname. The ctypes.util module provides a function which can help to determine the Loaders act like when a program is run, and call the runtime loader directly. Shared library the most recent should be loaded), while the ctypes library Similar to what the compiler does (on platforms with several versions of a The purpose of the find_library() function is to locate a library in a way When programming in a compiled language, shared libraries are accessed whenĬompiling/linking a program, and when the program is run.
We know how to access the contents of a pointer, so lets redefine our callback: > qsort ( ia, len ( ia ), sizeof ( c_int ), cmp_func ) py_cmp_func py_cmp_func py_cmp_func py_cmp_func py_cmp_func py_cmp_func py_cmp_func py_cmp_func py_cmp_func py_cmp_func >
Through the errcheck attribute see the reference manual for details. Please note that a much more powerful error checking mechanism is available
WinError takes an optional error code parameter, if no one is used, it calls Get the string representation of an error code, and returns an exception. WinError is a function which will call Windows FormatMessage() api to > Traceback (most recent call last):įile "", line 3, in ValidHandle WindowsError: The specified module could not be found. restype = ValidHandle > GetModuleHandle ( None ) 486539264 > GetModuleHandle ( "something silly" ) Traceback (most recent call last):įile "", line 3, in ValidHandle WindowsError: The specified module could not be found. GetModuleHandleA > def ValidHandle ( value ). Macro is used to expose one of them as GetModuleHandle depending on whether Module handle for a given module name, has the following C prototype, and a The win32 GetModuleHandle function, which returns a
The UNICODE version is exported withĪn W appended to the name, while the ANSI version is exported with an AĪppended to the name. Note that win32 system dlls like kernel32 and user32 often export ANSIĪs well as UNICODE versions of a function. MyOwnFunction Traceback (most recent call last):įile "ctypes.py", line 239, in _getattr_ func = _StdcallFuncPtr ( name, self ) AttributeError: function 'MyOwnFunction' not found > Traceback (most recent call last):įile "ctypes.py", line 239, in _getattr_ func = _StdcallFuncPtr ( name, self ) AttributeError: function 'MyOwnFunction' not found