Rockwell-automation 2708-NBD VBASIC Language Development Kit Manual de usuario descargar pdf (Pagina 76)

Appendix C

Application Library Subroutines

C–8

ReadPassword% Inputs a password from the keyboard.

e = ReadPassword% ( length%, string$ ) ;

FUNCTION ReadPassword% ( n%, s$ )

ReadInt% Input an integer value from the keyboard.

To suppress display of the default value, use a negative length.

e = ReadInt% ( length%, int% )

FUNCTION ReadInt% ( n%, v% )

ReadLong% Input a long value from the keyboard.

To suppress display of the default value, use a negative length.

e = ReadLong% ( length%, long& )

FUNCTION ReadLong% ( n%, v& )

ReadReal% Input a real value from the keyboard.

The precision specifies how many decimal points to display. It does not

affect the precision of the value input by the user. Use a negative length to

suppress the default value.

This only handles floating point values. NOT scientific forms.

e = ReadReal% ( length%, precision%, real! ) ;

FUNCTION ReadReal% ( n%, p%, v! )

Menu% Displays a menu and waits for a selection.

A menu$ is provided which is used to format a menu on the two lines of the

workstation display. The operator can select a menu entry by using 1 of 2

methods; these are:

1. Press a LETTER or NUMBER which corresponds to the first UPPER

CASE letter or NUMBER of an entry.

2. Using the cursor keys to move to the item to be selected, then pressing

Enter.

Regardless of the selection method used, Menu% will always return an event

code of 1 through 10 for the item which was selected. If the operator pressed

Clear or Exit, a functioin key, or an event occurred which was enabled by

GLOBALMASK%, then these codes will be returned instead of 1 through

10. See Env.BAS for information on use of GLOBALMASK%.

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Rockwell-automation 2708-NBD VBASIC Language Development Kit Manual de usuario Pagina 76