dev_update_pc — 在程序执行期间打开或关闭 PC 的更新功能。
dev_update_pc( : : DisplayMode : )
dev_update_pc specifies the behavior of the PC
during program execution.
If DisplayMode is set to 'on', which is the default,
within the selected procedure the PC is always displayed left to the
currently executed operator.
In addition the program text is scrolled---if necessary---so that
the current operator is visible.
If the mode is 'off' the PC is not visible during program execution and the program text will not be scrolled automatically. When the program stops the PC becomes visible again and the listing is scrolled to the current PC position.
For measuring the execution time of a sequence of operators all
update options should be switched off in order to reduce the
influence of the runtime of GUI updates in HDevelop.
For this the operators dev_update_pc, dev_update_time,
dev_update_var, and dev_update_window or the
procedures dev_update_on and dev_update_off
can be used.
This option can also be controlled via the Preferences dialog:
Edit -> Preferences
-> Runtime Settings
-> Update Program Counter.
此算子不支持代码导出。
DisplayMode (输入控制) string → (string)
Mode for runtime behavior.
默认值： 'off'
值列表： 'off', 'on'
If the values of the specified parameters are correct,
dev_update_pc 返回 2 ( H_MSG_TRUE )。否则，将抛出一个异常并返回错误代码。
dev_update_time,
dev_update_window,
dev_update_var
基础