VioShowBuf (FAPI)

This call updates the physical display buffer with the logical video buffer (LVB).

Syntax

VioShowBuf (Offset, Length, VioHandle)

Parameters

Offset (USHORT) - input

Starting offset within the logical video buffer at which the update to the screen is to start.

Length (USHORT) - input

Length of the area to be updated to the screen.

VioHandle (HVIO) - input

This must be zero unless the caller is a Presentation Manager application, in which case it must be the value returned by VioGetPs.

Return Code

rc (USHORT) - return

Return code descriptions are:

• 0 NO_ERROR
• 355 ERROR_VIO_MODE
• 430 ERROR_VIO_ILLEGAL_DURING_POPUP
• 436 ERROR_VIO_INVALID_HANDLE
• 465 ERROR_VIO_DETACHED

Remarks

VioShowBuf is ignored unless it is issued by a process that has previously called VioGetBuf and that is currently executing in the foreground.

PM Considerations

This function updates the display with the Advanced VIO presentation space.

Example Code

C Binding

#define INCL_VIO

USHORT  rc = VioShowBuf(Offset, Length, VioHandle);

USHORT           Offset;        /* Offset into LVB */
USHORT           Length;        /* Length */
HVIO             VioHandle;     /* Video handle */

USHORT           rc;            /* return code */

MASM Binding

EXTRN  VioShowBuf:FAR
INCL_VIO            EQU 1

PUSH   WORD    Offset        ;Offset into LVB
PUSH   WORD    Length        ;Length
PUSH   WORD    VioHandle     ;Video handle
CALL   VioShowBuf

Returns WORD

Related Functions

• VioGetBuf