| Operators |
query_bar_code_params — Get the names of the parameters that can be used in set_bar_code* and get_bar_code* operators for a given bar code model
query_bar_code_params( : : BarCodeHandle, Properties : GenParamName)
The operator query_bar_code_params returns parameter names of the bar code model that correspond to the selection given in Properties. To explain this, here first some background: After creating a bar code model, all parameters are initially set 'general', i.e., they have the same values set for each supported bar code type. During automatic parameter training or after calling the operator set_bar_code_param_specific some parameters might become bar code type specific at runtime. These parameters can not be read with the general operator get_bar_code_param but must be read for a given bar code type with get_bar_code_param_specific. To make this access easy and generic, the output GenParamName of query_bar_code_params can be used as input parameter GenParamName in get_bar_code_param or get_bar_code_param_specific, depending on Properties='*general' or Properties='*specific'.
Please note that you could alternatively use a static tuple of parameter names for get_bar_code_param or get_bar_code_param_specific (e.g. the parameter names described with these operators), but this is inflexible and therefore not recommended.
Possible values for Properties are:
Returns the names of all parameters supported by the bar code reader. The names are independent of the bar code model given in BarCodeHandle.
Returns the names of the parameters that contain the same values for all supported bar code types, i.e., there are no specific values set for certain bar code types, e.g., with set_bar_code_param_specific. The values of only these parameters can be read with get_bar_code_param.
Please note that the parameter name 'train' is explicitly excluded here. 'train' in a following call to get_bar_code_param would return a multivalue tuple and therefore couldn't be used within one tuple in combination with other parameter names.
Returns the names of the parameters that contain specific values for certain bar code types. The values of these parameters must be read with get_bar_code_param_specific instead of get_bar_code_param. Bar code type specific values can occur in conjunction with bar code autodiscrimination, described with the operator find_bar_code or automatic parameter training.
Returns the names of parameters that have already been trained and contain the same values for all supported bar code types. The training mode is described with the operator set_bar_code_param.
Returns the names of the parameters that have already been trained and contain specific values for certain bar code types. The training mode is described with the operator set_bar_code_param.
Handle of the bar code model.
Properties of the parameters.
Default value: 'trained_general'
List of values: 'all', 'general', 'specific', 'trained_general', 'trained_specific'
Names of the generic parameters.
TrainParams := ['element_size_min', 'element_size_max', 'orientation']
Train3times := gen_tuple_const(|TrainParams|,'train')
create_bar_code_model (Train3times, TrainParams, BarCodeHandle)
find_bar_code (Image, SymbolRegions, BarCodeHandle, 'EAN-13', \
DecodedDataStrings)
query_bar_code_params (BarCodeHandle, 'trained_general', NamesGen)
* returns NamesGen = ['element_size_max', 'element_size_min']
get_bar_code_param (BarCodeHandle, NamesGen, ValGen)
* returns e.g. ValGen = [4.0, 1.5]
query_bar_code_params (BarCodeHandle, 'trained_specific', NamesSpec)
* returns NamesSpec = ['orientation', 'orientation_tol']
get_bar_code_param_specific (BarCodeHandle, 'EAN-13', NamesSpec, ValSpec)
* returns e.g. ValSpec = [89.9127, 0.5]
The operator query_bar_code_params returns the value 2 (H_MSG_TRUE) if the given parameters are correct. Otherwise, an exception is raised.
find_bar_code, decode_bar_code_rectangle2
get_bar_code_param, get_bar_code_param_specific
Bar Code
| Operators |