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#define INCL_DOSDEVIOCTL
 
USHORT DosDevIOCtl(pbShiftState, 0L, 0x0073, 0x0004, hDevice)
PBYTE pbShiftState;    /* pointer to structure for shift state */
HFILE hDevice;         /* device handle                        */
 
The KBD_GETSHIFTSTATE function retrieves the shift state of the default
keyboard of the current screen group. The shift state identifies whether the
SHIFT, CTRL, ALT, INS, and SYSREQ keys are up or down and whether the SCROLL
LOCK, NUMLOCK, CAPSLOCK, and INSERT modes are on.
 
Parameter     Description
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pbShiftState  Points to the SHIFTSTATE structure that receives the shift
              state.
 
hDevice       Identifies the keyboard that receives the device-control
              function. The handle must have been created previously by
              using the DosOpen function.
 
Return Value
 
The return value is zero if the function is successful or an error value if
an error occurs.
 
Comments
 
The shift state is set by incoming keystrokes. It can also be set by using
the KBD_SETSHIFTSTATE function (0x0004, 0x0053).
 
See Also
 
DosOpen, KBD_SETSHIFTSTATE, SHIFTSTATE
 
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