os.open and os.fdopen on windows

[deanhystad]

I think I've run into a problem with python locking files that were opened using open(). This happens one Windows 10

I am trying to pass information from a python application to a C# application via a shared file. When I open the file for writing in Python the C# application cannot open the file. When I close the file in Python the C# application can open and read the file. I know the problem is not flush() because I can see the size of the file change when the information is written (using the file browser) and I tried calling flush() after the write.

I think I can open an unlocked file using os.open() and os.fdopen() but I am having difficulty finding examples that run on Windows. I would be grateful for any links you can provide.

[DeaD_EyE]

Windows is different. You could use the win32pipe for named pipes, but the API is not Pythonic.
Here is an example: https://stackoverflow.com/questions/4854...amed-pipes

Instead, I would use zmq. This library is for IPC and does not require a dedicated server. You can use different patterns like PUB-SUB is one of them I used in my project to exchange information between different processes.

[deanhystad]

I don't have a choice about how to do the communication. The C# application is not under my control.

[DeaD_EyE]

And what kind of file is it? A NamedPipe was my guess.

[deanhystad]

Regular file.

[Gribouillis]

You could perhaps write a temporary file, then rename it now and then.

There is also this discussion in python.org.