[#367] Fixed encoding errors in DisplayCAL.worker.exec_cmd() for Wi…

…ndows by setting the `PYTHONLEGACYWINDOWSSTDIO` environment variable. This is a temporary fix and the neccessary changes to allow `utf-8` encoding will be introduced in future.

[#367] Fixed `DisplayCAL.worker._safe_send()` for Windows.
[#367] Updated `README.md` for Windows install instructions.

DisplayCAL/display_cal.py

@@ -113,6 +113,7 @@
 elif sys.platform == "darwin":
     from DisplayCAL import util_mac
 from DisplayCAL import wexpect
+# import wexpect
 from DisplayCAL.argyll_cgats import (
     cal_to_fake_profile,
     can_update_cal,

DisplayCAL/main.py

@@ -218,7 +218,7 @@ def _main(module, name, app_lock_file_name, probe_ports=True):
                     lockfile.unlock()
             except EnvironmentError as exception:
                 # This shouldn't happen
-                print("Warning - could not read lockfile %s:" % lockfilename, exception)
+                print(f"Warning - could not read lockfile {lockfilename}:", exception)
         if module not in multi_instance:
             # Check lockfile(s) and probe port(s)
             for lockfilename in [app_lock_file_name]:
@@ -228,7 +228,7 @@ def _main(module, name, app_lock_file_name, probe_ports=True):
                     pid, port = pids_ports[0]
                     appsocket = AppSocket()
                     if appsocket and port:
-                        print("Connecting to %s..." % port)
+                        print(f"Connecting to {port}...")
                         if appsocket.connect(host, port):
                             print("Connected to", port)
                             # Other instance already running?