_SCREENEXISTS - QB64Official/qb64 GitHub Wiki

The _SCREENEXISTS function returns true (-1) once a screen has been created.

Syntax

screenReady%% = _SCREENEXISTS

Description

  • Function returns true (-1) once a program screen is available to use or change.
  • Can be used to avoid program errors because a screen was not ready for input or alterations.
    • Use before _TITLE, _SCREENMOVE and other functions that require the output window to have been created.

Example(s)

The loop busy-waits until the screen exists to add the title.


SCREEN 12
DO: LOOP UNTIL _SCREENEXISTS
_TITLE "My Title"

See Also