query_io_interface — Query information about the specified I/O device interface.
query_io_interface( : : IOInterfaceName, Query : Result)
该算子 query_io_interface returns information about
the I/O device interface IOInterfaceName. The desired
information is specified via Query. If applicable,
Result contains a list of supported values.
Generally, when passing the value 'interface_name' for
Query, all available I/O interfaces are returned. The value
of the parameter IOInterfaceName is ignored in this case.
Please check the directory doc/html/reference/io
for documentation about your specific I/O device interface, where
all supported interface specific parameters are listed.
On Windows Systems, error dialog boxes from the operating system can occur when dependency modules of the interface are not found, e.g., the according SDK was not installed. The occurrence of the error boxes can be controlled by setting Windows' Error Mode. Please refer to the description of SetErrorMode within the Windows MSDN documentation.
IOInterfaceName (input_control) string → (string)
HALCON I/O interface name.
Default: []
Suggested values: 'ADLINK-DAQPilot', 'ADLINK-EOS', 'Advantech', 'Contec', 'Hilscher-cifX', 'Interface', 'Linux-GPIO', 'NIDAQmx', 'OPC_Classic', 'OPC_UA'
Query (input_control) string(-array) → (string)
Parameter name of the query.
Default: 'io_device_names'
Suggested values: 'interface_name', 'io_device_names', 'param_name', 'revision'
Result (output_control) string-array → (string / integer / real)
List of result values (according to Query).
* Select a suitable i/o device interface of name IOInterfaceName
query_io_interface (IOInterfaceName, 'io_device_names', DeviceNames)
open_io_device (IOInterfaceName, DeviceNames[0], [], [], IODeviceHandle)
query_io_device (IODeviceHandle, [], 'io_channel_names.digital_input', \
ChannelInputNames)
open_io_channel (IODeviceHandle, ChannelInputNames[0], [], [], \
IOChannelHandle)
read_io_channel (IOChannelHandle, Value, Status)
如果参数均有效，算子
query_io_interface 返回值 2 (
H_MSG_TRUE)
. If necessary an
exception is raised. In this case, an extended error information may be
set and can be queried with 该算子 get_extended_error_info.
Foundation