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Docs » Autodocs » console.device » OpenDevice

NAME

	OpenDevice -- a request to open a Console device

SYNOPSIS

	error = OpenDevice("console.device", unit, IOStdReq, flags )
d0 a0 d0 a1 d1

FUNCTION

	The open routine grants access to a device.  There are two
fields in the IOStdReq block that will be filled in: the
io_Device field and possibly the io_Unit field.
As of (V37) the flags field may also be filled in with
a value described below (see conunit.h or conunit.i).
This open command differs from most other device open commands
in that it requires some information to be supplied in the
io_Data field of the IOStdReq block. This initialization
information supplies the window that is used by the console
device for output.
The unit number that is a standard parameter for an open call
is used specially by this device. See conunit.h, or conunit.i
for defined valid unit numbers.
unit number: -1 (CONU_LIBRARY)
Used to get a pointer to the device library vector
which is returned in the io_Device field of the IOStdReq
block. No actual console is opened. You must still close
the device when you are done with it.
unit number: 0 (CONU_STANDARD)
A unit number of zero binds the supplied window to
a unique console. Sharing a console must be done at a level
higher than the device.
unit number: 1 (CONU_CHARMAP) (V36)
A unit number of one is similar to a unit number of
zero, but a console map is also created, and maintained by
the console.device. The character map is used by the console
device to restore obscured portions of windows which are
revealed, and to redraw a window after a resize. Character
mapped console.device windows must be opened as SIMPLE REFRESH
windows.
The character map is currently for internal use
only, and is not accessible by the programmer. The character
map stores characters, attributes, and style information for
each character written with the CMD_WRITE command.
unit number: 3 (CONU_SNIPMAP) (V36)
A unit number of three is similar to a unit number
of one, but also gives the user the ability to highlight
text with the mouse which can be copied by pressing
RIGHT AMIGA C. See NOTES below.
flags: 0 (CONFLAG_DEFAULT)
The flags field should be set to 0 under V34, or less.
flags: 1 (CONFLAG_NODRAW_ON_NEWSIZE) (V37)
The flags field can be set to 0, or 1 as of V37. The
flags field is ignored under V36, so can be set, though it
will have no effect. When set to 1, it means that you don't
want the console.device to redraw the window when the window
size is changed (assuming you have opened the console.device
with a character map - unit numbers 1, or 3). This flag is
ignored if you have opened a console.device with a unit
number of 0. Typically you would use this flag when you
want to perform your own window refresh on a newsize, and
you want the benefits of a character mapped console.
IO REQUEST
io_Data struct Window *window
This is the window that will be used for this
console. It must be supplied if the unit in
the OpenDevice call is not -1 (see above). The
RPort of this window is potentially in use by
the console whenever there is an outstanding
write command.

INPUTS

	"console.device" - a pointer to the name of the device to be opened.
unit - the unit number to open on that device.
IOStdReq - a pointer to a standard request block
0 - a flag field of zero (CONFLAG_DEFAULT)
1 - a flag field of one (CONFLAG_NODRAW_ON_NEWSIZE) (V37)

RESULT

	error - zero if successful, else an error is returned.

NOTES

	As noted above, opening the console.device with a unit number of 3
allows the user to drag select text, and copy the selection with
RIGHT AMIGA C. The snip is copied to a private buffered managed
by the console.device (as of V36). The snip can be copied to
any console.device window unless you are running a console to
clipboard utility such as that provided with V37.
The user pastes text into console.device windows by pressing
RIGHT AMIGA V. Both RIGHT AMIGA V, and RIGHT AMIGA C are swallowed
by the console.device (unless you have asked for key presses as
RAW INPUT EVENTS). Text pasted in this way appears in the
console read stream as if the user had typed all of the characters
manually. Additional input (e.g., user input, RAW INPUT EVENTS)
are queued up after pastes. Pastes can theoretically be quite
large, though they are no larger than the amount of text
which is visible in a console.device window.
When running the console to clipboard utility, text snips
are copied to the clipboard.device, and RIGHT AMIGA V key
presses are broadcast as an escape sequence as part of the
console.device read stream ("<CSI>0 v" - $9B,$30,$20,$76).
It is left up to the application to decide what to do when this
escape sequence is received. Ideally the application
will read the contents of the clipboard, and paste the text
by using successive writes to the console.device.
Because the contents of the clipboard.device can be quite
large, your program should limit the size of writes to something
reasonable (e.g., no more than 1K characters per CMD_WRITE, and
ideally no more than 256 characters per write). Your program
should continue to read events from the console.device looking
for user input, and possibly RAW INPUT EVENTS. How you decide
to deal with these events is left up to the application.
If you are using a character mapped console you should receive
Intuition events as RAW INPUT EVENTS from the console.device.
By doing this you will hear about these events after the console
device does. This allows the console.device to deal with events
such as window resizing, and refresh before your application.

BUGS

SEE ALSO

<exec/io.h>, <intuition/intuition.h>

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