KbdClose

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This call closes the existing logical keyboard identified by the keyboard handle.

Syntax

KbdClose (KbdHandle)

Parameters

KbdHandle (HKBD) - input
Default keyboard or the logical keyboard.

Return Code

rc (USHORT) - return
Return code descriptions are:
  • 0 - NO_ERROR
  • 439 - ERROR_KBD_INVALID_HANDLE
  • 464 - ERROR_KBD_DETACHED
  • 504 - ERROR_KBD_EXTENDED_SG

Remarks

KbdClose blocks while another thread has the keyboard focus (by way of KbdGetFocus) until the thread with the focus issues KbdFreeFocus. Therefore, to prevent KbdClose from blocking, it is recommended that KbdClose be issued only while the current thread has the focus. For example:

KbdGetFocus
Wait until focus available on handle 0.
KbdClose
Close a logical keyboard handle.
KbdClose
Close another logical keyboard handle.
KbdClose
Close still another logical keyboard handle.
KbdFreeFocus
Give up the focus on handle 0.

Bindings

C

#define INCL_KBD

USHORT  rc = KbdOpen(KbdHandle);
PHKBD   KbdHandle;     /* Keyboard handle */
USHORT  rc;            /* return code */

MASM

EXTRN  KbdOpen:FAR
INCL_KBD            EQU 1

PUSH@  WORD    KbdHandle     ;Keyboard handle
CALL   KbdOpen

Returns WORD