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.\"
.\" Copyright 1996 Hewlett-Packard Company
.\" Copyright 1996 International Business Machines Corp.
.\" Copyright 1996, 1999, 2004 Sun Microsystems, Inc.
.\" Copyright 1996 Novell, Inc.
.\" Copyright 1996 Digital Equipment Corp.
.\" Copyright 1996 Fujitsu Limited
.\" Copyright 1996 Hitachi, Ltd.
.\" Copyright 1996 X Consortium, Inc.
.\"
.\" Permission is hereby granted, free of charge, to any person obtaining a
.\" copy of this software and associated documentation files (the "Software"),
.\" to deal in the Software without restriction, including without limitation
.\" the rights to use, copy, modify, merge, publish, distribute,
.\" sublicense, and/or sell copies of the Software, and to permit persons
.\" to whom the Software is furnished to do so, subject to the following
.\" conditions:
.\"
.\" The above copyright notice and this permission notice shall be
.\" included in all copies or substantial portions of the Software.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
.\" IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE.
.\"
.\" Except as contained in this notice, the names of the copyright holders
.\" shall not be used in advertising or otherwise to promote the sale, use
.\" or other dealings in this Software without prior written authorization
.\" from said copyright holders.
.\"
.TH XpCreateContext 3Xp __xorgversion__ "XPRINT FUNCTIONS"
.SH NAME
XpCreateContext \- Creates and initializes a new print context.
.SH SYNOPSIS
.br
cc [ flag... ] file... -lXp [ library... ]
.br
#include <X11/extensions/Print.h>
.LP
.B XPContext XpCreateContext
(
.I display,
.I printer_name
)
.br
Display *\fIdisplay\fP\^;
.br
char *\fIprinter_name\fP\^;
.if n .ti +5n
.if t .ti +.5i
.SH ARGUMENTS
.TP
.I display
Specifies a pointer to the Display structure; returned from XOpenDisplay.
.TP
.I printer_name
The name of a printer on display. String encoded as COMPOUND_TEXT.
.SH DESCRIPTION
.LP
XpCreateContext creates a new print context that is initialized with the default
printer attributes and other information available for
.I printer_name
on display. A print context maintains the printer name, print
attributes, font capabilities, print (rendering) state and results, and is the
object upon which the Xp calls act.
If the library fails to generate a new print context-id, a value of None is
returned, otherwise a print context-id is always returned. If
.I printer_name
is invalid, a BadMatch is generated later by the
.I X Print Server.
A call to XpGetPrinterList will return a valid list of values for
.I printer_name.
All printer name values in the X Print Service are encoded as COMPOUND_TEXT (of
which the ISO-8859-1 code-set is a proper subset).
As soon as a print context is created, the print attributes in it can be
accessed and modified by calling XpGetAttributes and XpSetAttributes, and the
event selections in it can be modified by calling XpSelectInput and
XpInputSelected. Other Xp calls that explicitly take a print context-id as a
parameter will operate directly on that print context. All Xp and X calls
without a print context-id parameter (for example, all rendering oriented calls
like XpStartJob and XDrawLine) require that a print context be set on the
display connection (see XpSetContext). Failure to set a print context prior to
calling a print-context-dependent call will result in the generation of an
XPBadContext error.
The XPContext returned by XpCreateContext is an XID, and can be used to set the
print context on display connections by calling XpSetContext. The XPContext id
can be shared between processes and display connections. It is the
responsibility of the clients sharing a print context to coordinate their usage
of the context; for example they must ensure that in-use print contexts are not
prematurely destroyed.
The context_id remains valid for all clients until 1) the client creating the
print context closes its display connection, or 2) any client calls
XpDestroyContext. The context_id can be kept valid after the creating client's
display connection
closes if XSetCloseDownMode is called on display with RetainPermanent or
RetainTemporary.
After creating a print context, and possibly modifying the XPDocAttr attribute
document-format using a value from the list of available formats shown in the
XPPrinterAttr attribute document-formats-supported, the application must query
the
.I X Print Server
via XpGetScreenOfContext for the screen that has been
associated with the print context, and then create all server resources that
will be used in the print job on that screen. Failure to do so will result in
undefined behavior.
When XpCreateContext is called, the
.I client's
locale (see XpSetLocaleHinter) is
included in the request as a "hint" to the
.I X Print Server.
If supported by the
implementation, the
.I X Print Server
will use the hint to initialize the attribute
pools with any localized attribute values (for example, the human readable
XPPrinterAttr attribute "descriptor" may be available in several different
languages, and the hint will be used to select one). If the
.I X Print Server
cannot understand the hint, the
.I X Print Server
chooses a default value.
This function can generate a BadMatch error if the specified
.I printer_name
does not exist on display, or if the print server could not interpret the code
set specified in
.I printer_name.
.SH DIAGNOSTICS
.TP 15
.SM BadMatch
The value specified for doc_fmt is not valid for the current document type or
the value specified for drawable is not valid for the print context and print
screen.
.SH "SEE ALSO"
.BR XpDestroyContext (3Xp),
.BR XpGetAttributes (3Xp),
.BR XpGetPrinterList (3Xp),
.BR XpGetScreenOfContext (3Xp),
.BR XpInputSelected (3Xp),
.BR XpSelectInput (3Xp),
.BR XpSetAttributes (3Xp),
.BR XpSetContext (3Xp),
.BR XpSetLocaleHinter (3Xp),
.BR XpStartJob (3Xp)
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