msl.examples.loadlib.kernel64 module

Communicates with kernel32.dll via the Kernel32 class.

Example of a module that can be executed by a 64-bit Python interpreter which can communicate with a Windows 32-bit library, kernel32.dll, that is hosted by the corresponding 32-bit Python server, kernel32.

Kernel64 is the 64-bit client and Kernel32 is the 32-bit server for inter-process communication.

Note

The kernel32.dll library is a standard Windows library and therefore this example is only valid on a computer running Windows.

class msl.examples.loadlib.kernel64.Kernel64[source]

Bases: Client64

Example of a class that can communicate with the 32-bit kernel32.dll library.

This class demonstrates how to communicate with a Windows 32-bit library if an instance of this class is created within a 64-bit Python interpreter.

Base class for communicating with a 32-bit library from 64-bit Python.

Starts a 32-bit server, Server32, to host a Python class that is a wrapper around a 32-bit library. Client64 runs within a 64-bit Python interpreter, and it sends a request to the server which calls the 32-bit library to execute the request. The server then provides a response back to the client.

Changed in version 0.6: Added the rpc_timeout argument.

Changed in version 0.8: Added the protocol argument and the default quiet value became None.

Changed in version 0.10: Added the server32_dir argument.

Parameters:

  • module32 (str) – The name of the Python module that is to be imported by the 32-bit server.

  • host (str, optional) – The address of the 32-bit server. Default is '127.0.0.1'.

  • port (int, optional) – The port to open on the 32-bit server. Default is None, which means to automatically find a port that is available.

  • timeout (float, optional) – The maximum number of seconds to wait to establish a connection to the 32-bit server. Default is 10 seconds.

  • quiet (bool, optional) – This keyword argument is no longer used and will be removed in a future release.

  • append_sys_path (str or list of str, optional) – Append path(s) to the 32-bit server’s sys.path variable. The value of sys.path from the 64-bit process is automatically included, i.e., sys.path(32bit) = sys.path(64bit) + append_sys_path.

  • append_environ_path (str or list of str, optional) – Append path(s) to the 32-bit server’s os.environ['PATH'] variable. This can be useful if the library that is being loaded requires additional libraries that must be available on PATH.

  • rpc_timeout (float, optional) – The maximum number of seconds to wait for a response from the 32-bit server. The RPC timeout value is used for all requests from the server. If you want different requests to have different timeout values then you will need to implement custom timeout handling for each method on the server. Default is None, which means to use the default timeout value used by the socket module (which is to wait forever).

  • protocol (int, optional) – The pickle protocol to use. If not specified then determines the value to use based on the version of Python that the Client64 is running in.

  • server32_dir (str, optional) – The directory where the frozen 32-bit server is located.

  • **kwargs – All additional keyword arguments are passed to the Server32 subclass. The data type of each value is not preserved. It will be a string at the constructor of the Server32 subclass.

Note

If module32 is not located in the current working directory then you must either specify the full path to module32 or you can specify the folder where module32 is located by passing a value to the append_sys_path parameter. Using the append_sys_path option also allows for any other modules that module32 may depend on to also be included in sys.path so that those modules can be imported when module32 is imported.

Raises:

  • ConnectionTimeoutError – If the connection to the 32-bit server cannot be established.

  • OSError – If the frozen executable cannot be found.

  • TypeError – If the data type of append_sys_path or append_environ_path is invalid.

get_local_time()[source]

Sends a request to the 32-bit server, Kernel32, to execute the kernel32.GetLocalTime function to get the current date and time.

See the corresponding 32-bit get_time() method.

Returns:

datetime – The current date and time.