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properly distinguish between read error and no data read

This commit is contained in:
Daniel Pavel 2012-09-27 15:16:43 +03:00
parent 05560d8af4
commit 0dc02af78d
1 changed files with 5 additions and 2 deletions
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7
lib/hidapi.py
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@ -277,8 +277,11 @@ def read(device_handle, bytes_count, timeout_ms=-1):
""" """
out_buffer = _C.create_string_buffer(b'\x00' * (bytes_count + 1)) out_buffer = _C.create_string_buffer(b'\x00' * (bytes_count + 1))
bytes_read = _native.hid_read_timeout(device_handle, out_buffer, bytes_count, timeout_ms) bytes_read = _native.hid_read_timeout(device_handle, out_buffer, bytes_count, timeout_ms)
if bytes_read > -1: if bytes_read == -1:
return out_buffer[:bytes_read] return None
if bytes_read == 0:
return b''
return out_buffer[:bytes_read]
def send_feature_report(device_handle, data, report_number=None): def send_feature_report(device_handle, data, report_number=None):