HP Data Entry and Forms Management System (VPLUS) Reference Manual (32209-90024)

262 Chapter6

USING VPLUS INTRINSICS

INTRINSIC DESCRIPTIONS

VREADFIELDS, lock the keyboard as soon as the terminal begins transmitting data when

triggered by the

Enter key or a function key.

VOPENTERM must be called before using this procedure. This procedure is intended only for

advanced programmers who are proﬁcient with terminal control operations and VPLUS

terminal settings. Terminal keyboard operations, such as PREV PAGE and NEXT PAGE, can

be performed programmatically by sending the appropriate escape sequences to the

terminal via VBLOCKWRITE. VBLOCKWRITE can also be used to write large blocks of

unformatted text or multiple report lines in between uses of predeﬁned VPLUS forms. To

ensure portability of the application from one driver to another, alteration of terminal

straps using VBLOCKWRITE is not recommended. See VTURNON and VTURNOFF for

information on how to switch between character mode and block mode without disturbing

the screen.

The following examples illustrate a call to VBLOCKWRITE using common programming

languages:

COBOL:

CALL “VBLOCKWRITE” USING COMAREA @BUF LEN TMODE LOC TC.

BASIC:

CALL VBLOCKWRITE(C(*),B1$,L1,M1,L(*),T1)

FORTRAN:

CALL VBLOCKWRITE(COMAREA,BUF,LEN,TMODE,LOC,TC)

SPL:

VBLOCKWRITE(COMAREA,BUF,LEN,TMODE,LOC,TC);

Pascal:

VBLOCKWRITE(COMAREA,BUF,LEN,TMODE,LOC,TC);