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###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
# text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2025 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://brltty.app/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################
import sys
import sysconfig
import os
import time
import ctypes
def getProgramName ():
return os.path.basename(sys.argv[0])
def logMessage (message, file=sys.stderr, label=getProgramName()):
file.write((label + ": " + message + "\n"))
file.flush()
def getBuildDirectory (directory):
name = "{prefix}.{platform}-{version[0]}.{version[1]}".format(
prefix = directory,
platform = sysconfig.get_platform(),
version = sys.version_info
)
return os.path.join(os.getcwd(), "build", name)
def getLibraryDirectory ():
return os.path.join(os.getcwd(), "..", "..", "Programs")
def loadLibrary (directory, name):
platform = sysconfig.get_platform()
if platform == "win32":
pattern = name + "-*.dll"
import fnmatch
names = [name
for name in os.listdir(directory)
if fnmatch.fnmatch(name, pattern)
]
return ctypes.WinDLL(os.path.join(directory, names[0]))
return ctypes.CDLL(os.path.join(directory, ("lib" + name + ".so")))
sys.path.insert(0, getBuildDirectory("lib"))
library = loadLibrary(getLibraryDirectory(), "brlapi")
import brlapi
if __name__ == "__main__":
import errno
def writeProperty (name, value):
try:
value = value.decode("utf-8")
except AttributeError:
pass
sys.stdout.write(name + ": " + value + "\n")
writeProperty("BrlAPI Version", ".".join(map(str, brlapi.getLibraryVersion())))
try:
brl = brlapi.Connection()
try:
writeProperty("File Descriptor", str(brl.fileDescriptor))
writeProperty("Server Host", brl.host)
writeProperty("Authorization Schemes", brl.auth)
writeProperty("Driver Name", brl.driverName)
writeProperty("Model Identifier", brl.modelIdentifier)
writeProperty("Display Width", str(brl.displaySize[0]))
writeProperty("Display Height", str(brl.displaySize[1]))
brl.enterTtyMode()
try:
timeout = 10
brl.writeText("press keys (timeout is %d seconds)" % (timeout, ))
while True:
code = brl.readKeyWithTimeout(timeout * 1000)
if not code: break
properties = brlapi.describeKeyCode(code)
properties["code"] = "0X%X" % code
for name in ("flags", ):
properties[name] = ",".join(properties[name])
for property in (
("command" , "cmd"),
("argument", "arg"),
("flags" , "flg"),
):
(oldName, newName) = property
properties[newName] = properties[oldName]
del properties[oldName]
names = ("code", "type", "cmd", "arg", "flg")
values = map(lambda name: ("%s=%s" % (name, str(properties[name]))), names)
text = " ".join(values)
brl.writeText(text)
writeProperty("Key", text);
finally:
brl.leaveTtyMode()
finally:
brl.closeConnection()
except brlapi.ConnectionError as e:
if e.brlerrno == brlapi.ERROR_CONNREFUSED:
logMessage("Connection to %s refused. BRLTTY is too busy..." % e.host)
elif e.brlerrno == brlapi.ERROR_AUTHENTICATION:
logMessage("Authentication with %s failed. Please check the permissions of %s" % (e.host, e.auth))
elif e.brlerrno == brlapi.ERROR_LIBCERR and (e.libcerrno == errno.ECONNREFUSED or e.libcerrno == errno.ENOENT):
logMessage("Connection to %s failed. Is BRLTTY really running?" % (e.host))
else:
logMessage("Connection to BRLTTY at %s failed: " % (e.host))
print(e)
print(e.brlerrno)
print(e.libcerrno)
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