UniBasic Commands Reference - Rocket Software

Parameters
The following table describes each parameter of the syntax.
Parameter Description
1-559 UniBasic Commands Reference
filename Specifies the file to open. filename must include the entire path
name unless the file resides in the current directory.
READONLY Directs UniData to open the file for reading only. If the program
attempts to write to a file opened in READONLY mode,
UniData displays a runtime error message and does not update
the file. For information about security procedures, see
Administering UniData on UNIX or Administering UniData on
Windows Platforms.
WRITEONLY Specifies that the pipe or file is open for write access only.
TO file.var Specifies a variable to contain a pointer to the file.
NODELAY Forces a pipe to be opened immediately. This enables a process
to continue even when the pipe is not open in the opposite access
mode. The application must then manage access to the pipe to
ensure that it is opened for the opposite process before reading
from or writing to it.
If filename is not a named pipe, NODELAY has no effect.
ON ERROR statements Specifies statements to execute if the OSOPEN statement fails
with a fatal error because the file is not open, an I/O error occurs,
or UniData cannot find the file.
If you do not specify the ON ERROR clause and a fatal error
occurs, the program terminates.
THEN statements END THEN executes if the read is successful. END is required to
terminate multiline THEN statements.
ELSE statements END ELSE executes if the read is not successful or the record (or ID)
does not exist. END is required to terminate multiline ELSE
statements.
OSOPEN Parameters