|Related Syntax||Related Concepts|
open stream-name indexer? open-modifiers? as attachment
Setting a stream to
open allows it to be written to and causes previous contents to be lost, just as though the stream had been discarded.
A stream can be opened if it is:
The permitted attachments are:
buffer, which opens the stream as a buffer.
referentstring-expression, which opens the stream as a referent whose name is given by the string expression.
filestring-expression, which opens the stream as a file whose name is given by the string expression. This is the recommended way to open files.
external-output-functioncall, which opens the stream as a "connection" to an external output function. When data is written to the stream, it is processed by the external output function. This extends the ways in which OmniMark interacts with the external environment, simply by adding external function libraries.
Open modifiers are modifiers that affect how the stream is opened. If more than one open modifier is specified, they must be enclosed in parentheses and separated by "&". Each modifier can be specified only once. The modifiers are:
(Note that for backward compatibility, OmniMark allows the
file keyword to be omitted from the
file attachment. This practice is deprecated in versions of OmniMark later than V3.)
local stream x ... open x as binary-mode file "y" open x as file binary-mode file "y" open x with binary-mode as file "y" open x with buffered as file "y" open x with unbuffered text-mode as file "y"
This code fragment includes five different
open...as file statements. The first two are equivalent, though the second is the more efficient form of the statement. The third action is different.
In the first action, note that
binary-mode file "y" is a string expression, whose value is the content of the binary file named "y". This is the deprecated form of "
open...as file" (with the keyword
file omitted), so that x is opened as a file whose name is contained in the binary file "y". On systems where
text-mode is the default, x will be opened in text mode; on other systems, it will be opened in binary mode.
The second action is a slightly clearer way of doing the same thing as the first action. You are strongly encouraged to use this second form instead of the first.
The third action opens x in binary mode with the name "y".
The fourth action opens x as a buffered file with the name "y".
The fifth action opens x as an unbuffered file in text mode with the name "y".
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