Rockwell-automation 2708-NBD VBASIC Language Development Kit Instrukcja Użytkownika Pobierz pdf (Strona 74)

Appendix C

Application Library Subroutines

C–6

Note: In EnvPC, dashes are returned, not slashes (MM-DD-YYYY).

CL1 Clears the top line of the display and homes cursor.

CL2 Clears line 2 and left justifies cursor.

SUB CL1

SUB CL2

PC1 Prints a string centered on line 1.

PC2 Prints a string centered on line 2.

PC1 s$

SUB PC1 ( s$ )

SUB PC2 ( s$ )

ReadFlush Flushes the keyboard buffer.

This clears the keyboard buffer of any pending keystrokes.

ReadFlush

SUB ReadFlush

ReadStrField% Input a string on the display

The string$ contents are placed on the screen and may be edited by the user.

This default may be inhibited using NODEFAULT.

The attr% is made by adding the following:

AUTOEXIT Causes the field to be auto exited. . . . .

BLANKPAD Selects blank padding instead of underscores. . . . .

SECURE The field is displayed as asterisks. . . . . . . .

NOEDIT Displayed but cannot be edited. . . . . . . .

NOCLEAR Inhibits auto clear on input. . . . . .

NOCURSOR Inhibits display of cursor during edit. . . .

FORMEXIT Allow arrows to exit the field entry. . . . .

NODEFAULT Do not use the default value in the string. . . .

USETABLE Use CHARTABLE$ to restrict legal characters. . . . .

The fieldlength% is in characters. The startingchar% specifies the offset from

the beginning of the field at which editing is to start, this begins at 0. Note

that the global EXITOFFSET% is set to the cursor position at exit. These

may be used to restart a read which was interrupted by some event.

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Rockwell-automation 2708-NBD VBASIC Language Development Kit Instrukcja Użytkownika Strona 74