grc windows [MsgToFile] Error opening file: can't have unbuffered text I/O

[miweber67]

What happened?

Adding a Message To File block produces the following error when running:

[MsgToFile] Error opening file: can't have unbuffered text I/O

The issue is the ", 0" in MsgToFile.py:

      # 0 says unbuffered / write immediately
      if (overwrite):
        self.fp = open(filename,"w", 0)
      else:
        self.fp = open(filename,"a", 0)

Removing the ', 0' allows the MsgToFile block to work correctly, although output is now buffered. Manual flushing would need to be added to see the output right away. I didn't try to implement that.

System Information

OS: Windows 11
GR Installation Method: radioconda
gnuradio 3.10.9.2 (Python 3.11.7) on windows

GNU Radio Version

3.10 (maint-3.10)

Specific Version

3.10.9.2

Steps to Reproduce the Problem

Create a new GRC flowgraph. Add "Periodic Message Source" and a "Message To File" blocks. Connect them. Run the graph.

Relevant log output

[MsgToFile] Error opening file: can't have unbuffered text I/O