msl.examples.loadlib.labview64 module
Communicates with labview_lib32 via the Labview32 class.
Attention
This example requires that the appropriate LabVIEW Run-Time Engine is installed and that the operating system is Windows.
Example of a module that can be executed within a 64-bit Python interpreter which can
communicate with a 32-bit library, labview_lib32, that is hosted
by a 32-bit Python server, labview32. A 64-bit process cannot load a
32-bit library and therefore inter-process communication is used to
interact with a 32-bit library from a 64-bit process.
Labview64 is the 64-bit client and Labview32
is the 32-bit server for inter-process communication.
- class msl.examples.loadlib.labview64.Labview64[source]
Bases:
Client64Communicates with a 32-bit LabVIEW library, labview_lib32.
This class demonstrates how to communicate with a 32-bit LabVIEW 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.Client64runs 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 isNone, 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 (
strorlistofstr, optional) – Append path(s) to the 32-bit server’ssys.pathvariable. The value ofsys.pathfrom the 64-bit process is automatically included, i.e.,sys.path(32bit) = sys.path(64bit) + append_sys_path.append_environ_path (
strorlistofstr, optional) – Append path(s) to the 32-bit server’sos.environ['PATH']variable. This can be useful if the library that is being loaded requires additional libraries that must be available onPATH.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 isNone, which means to use the default timeout value used by thesocketmodule (which is to wait forever).protocol (
int, optional) – Thepickleprotocol to use. If not specified then determines the value to use based on the version of Python that theClient64is 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
Server32subclass. The data type of each value is not preserved. It will be a string at the constructor of theServer32subclass.
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.pathso 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.