set_check
— Activating and deactivating of HALCON control modes.
set_check( : : Check : )
With the help of the operator set_check
different control modes
of the HALCON system can be activated or deactivated. If a certain control
mode is activated, parameters etc., will be checked at runtime. Whenever an
inconsistency is hereby detected, the program will be interrupted by an
exception.
It is recommendable to activate the control modes during the development of a program and to deactivate them only after a successfully concluded testrun. For if the control mode is deactivated and an error occurs, the system may react in an unpredictable way.
The HALCON system provides various possible control modes which can be
activated and deactivated independently. By calling the operator
set_check
with the name (Check
) of the desired control
mode, this control mode is activated; the control mode is deactivated by
passing its name prefixed with a tilde
(~, e.g., '~data').
Except for the control mode 'memory' that is set exclusively for the whole system, all control modi are set thread-specific by default. When preceding the name of these control modi with a 'ref_' prefix, only the reference value of the particular modus is set. The reference value is used to initialize the respective modus when starting a new user thread.
Available control modes:
If this control mode is activated, only colors may be used which are supported by the display for the currently active window. Otherwise an error message is displayed.
In case of deactivated control mode and non existent colors, the {em
nearest color} is used (see also set_color
,
set_gray
, set_rgb
).
If this control mode is activated, it will check the coordinates
during the setting of the text cursor as well as during the display
of strings (write_string
) to the effect whether
a part of a sign would lie outside the windowframe (a fact which
is not forbidden in principle by the system).
If the control mode is deactivated, the text will be clipped at the windowframe.
(For program development)
Checks the consistency of image objects (regions and grayvalue components.
If this control mode is activated, the interface between the host language and the HALCON procedures will be checked in course (e.g., typifying and counting of the values).
This is a consistency check of objects (e.g., checks whether an object which shall be canceled does indeed exist or not.)
Determines whether errors shall trigger exceptions or not. If this control modes is deactivated, the application program must provide a suitable error treatment itself. Please note that errors which are not reported usually lead to undefined output parameters which may cause an unpredictable reaction of the program. Details about how to handle exceptions in the different HALCON language interfaces can be found in the HALCON Programmer's Guide and the HDevelop User's Guide.
If this control mode is activated when calling the operators
open_window
, HALCON allows only
the usage of the number of another HALCON window as the father
window of the new window; otherwise it allows also the usage of
IDs of operating system windows as the father window. This control
mode is only relevant for windows of type 'WIN32-Window', 'X-Window'
and 'Cocoa'.
(For program development)
Checks the consistency of chords (this may lead to a notable speed reduction of routines).
Normally, if a list of objects shall be canceled by using
clear_obj
, an exception will be raised, in case individual
objects do not or no longer exist. If the 'clear' mode is
activated, such objects will be ignored.
(For program development)
Checks the memory blocks freed by the HALCON memory management on consistency and overwriting of memory borders.
Activates all control modes.
Deactivates all control modes.
Default settings: ['give_error','database']
Check
(input_control) string(-array) →
(string)
Desired control mode.
Default value: 'default'
List of values: 'all' , 'clear' , 'color' , 'data' , 'database' , 'default' , 'father' , 'give_error' , 'interface' , 'memory' , 'none' , 'region' , 'text'
The operator set_check
returns the value 2 (H_MSG_TRUE), if
the parameters are correct.
Otherwise an exception will be raised.
get_check
,
set_color
,
set_rgb
,
set_hsi
,
write_string
none