qb64

Control-Break in QB64

I have been using the following code to trap control-break but I get nothing in return:

Control-Break during program execution causes the following to happen:

1)Invokes interrupt trap 1Bh
2)Places 00:00 into keyboard buffer
3)Sets flag 80h at memory 40:71h

An example to detect Control-Break (compiled):

DO
   X$=INKEY$
   IF X$=CHR$(0)+CHR$(0) THEN
      PRINT "*break*"
      END
   END IF
LOOP

Another example to detect Control-Break (compiled):

DEF SEG = &H40
POKE &H71, 0
DEF SEG
DO
   DEF SEG = &H40
   X = PEEK(&H71)
   DEF SEG
   IF X = 128 THEN
      PRINT "*break*"
      END
   END IF
LOOP

Is there anything I am missing?

Solution

  • I have found the following code to trap ctrl-break in qb64:

    ON TIMER(1) GOSUB breaktrap
TIMER ON
x = _EXIT ' disable break
DO
    _LIMIT 50
    x$ = INKEY$
LOOP
breaktrap:
v = _EXIT
IF v THEN
    PRINT "*break*"
    SLEEP 5
    SYSTEM
END IF
RETURN