def _find_error_str(self):
"""Get an error string from the Alpao SDK error stack.
Returns
-------
A string. Will be empty if there was no error on the stack.
"""
## asdkGetLastError should write a null-terminated string but
## doesn't seem like it (at least CannotOpenCfg does not ends in
## null) so we empty the buffer ourselves before using it. Note
## that even when there are no errors, we need to empty the buffer
## because the buffer has the message 'No error in stack'.
##
## TODO: report this upstream to Alpao and clean our code.
self._err_msg[0:self._err_msg_len] = b'\x00' * self._err_msg_len
err = ctypes.pointer(asdk.UInt(0))
status = asdk.GetLastError(err, self._err_msg, self._err_msg_len)
if status == asdk.SUCCESS:
msg = self._err_msg.value
if len(msg) > self._err_msg_len:
msg = msg + "..."
msg += "(error %i)" % (err.contents.value)
return msg
else:
return ""
def _find_error_str(self) -> str:
"""Get an error string from the Alpao SDK error stack.
Returns
-------
A string. Will be empty if there was no error on the stack.
"""
err_msg_buffer_len = 64
err_msg_buffer = ctypes.create_string_buffer(err_msg_buffer_len)
err = ctypes.pointer(asdk.UInt(0))
status = asdk.GetLastError(err, err_msg_buffer, err_msg_buffer_len)
if status == asdk.SUCCESS:
msg = err_msg_buffer.value
if len(msg) > err_msg_buffer_len:
msg = msg + b"..."
msg += b" (error code %i)" % (err.contents.value)
return msg.decode()
else:
return ""