Keywords currently not supported by QB64

The keywords listed here are not supported in QB64. QB64 is meant to be compatible with QB 4.5 or lower versions. PDS (7.1) is not supported. Older code that uses these keywords won't generate errors, as these are ignored by the compiler.

Note

The IDE does not support the opening or retrieval of more than one program at a time, but multiple instances of the IDE can be used simultaneously.

Keywords not supported in all versions

• ALIAS (supported in DECLARE LIBRARY only)
• ANY
• BYVAL (supported in DECLARE LIBRARY only)
• CALLS
• CDECL
• DATE$ (statement) (reading the current DATE$ is supported)
• DECLARE (non-BASIC statement)
• DEF FN, EXIT DEF, END DEF (must be reworked into actual FUNCTIONs)
• ERDEV, ERDEV$
• FILEATTR
• FRE
• IOCTL, IOCTL$
• OPEN with devices like LPT:, CON:, KBRD:, and other devices is not supported. LPRINT and OPEN COM are supported.
• ON PEN, PEN (statement), PEN (function)
• ON PLAY(n), PLAY(n) ON/OFF/STOP. (PLAY music is supported.)
• ON UEVENT, UEVENT (statement)
• SETMEM
• SIGNAL
• TIME$ (statement) (reading the current TIME$ is supported)
• TRON, TROFF
• WIDTH LPRINT combined statement is not supported.

Keywords not supported in Linux or macOS versions

The commands listed here contain platform-specific calls and may be implemented in the future in Linux and macOS. These commands currently result in stub calls which do nothing.

Desktop and Window calls:

• _ACCEPTFILEDROP, _TOTALDROPPEDFILES, _DROPPEDFILE, _FINISHDROP
• _SCREENPRINT
• _SCREENCLICK
• _SCREENMOVE (available in macOS, not available in Linux)
• _CLIPBOARDIMAGE, _CLIPBOARDIMAGE (function)
• _WINDOWHASFOCUS (available in Linux, not available in macOS)
• _WINDOWHANDLE
• _CAPSLOCK, _NUMLOCK, _SCROLLLOCK (statements and functions)

Modularity: QB64 has no limit on file size so BAS file modules can be combined.

• CHAIN
• RUN

Mouse related:

• _MOUSEWHEEL (available in Linux, not available in macOS)

Printing:

• LPRINT
• _PRINTIMAGE

Port access:

• OPEN COM

File locking:

• LOCK
• UNLOCK

QB64 Programming References

Wiki Pages Main Page with Articles and Tutorials QB64 specific keywords (alphabetical) Original QBasic keywords (alphabetical) OpenGL specific keywords (alphabetical) Keywords by Usage

Got a question about something? Frequently Asked Questions about QB64 QB64 Phoenix Edition Community Forum

Links to other QBasic Sites: Pete's QBasic Forum Pete's QBasic Downloads