268 lines
7.3 KiB
Groff
268 lines
7.3 KiB
Groff
.\" Copyright (c) 1993, 1994 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included in
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.\" all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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.\" SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall not
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.\" be used in advertising or otherwise to promote the sale, use or other
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.\" dealing in this Software without prior written authorization from the
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.\" X Consortium.
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.\"
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.ds tk X Toolkit
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xI Intrinsics
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.ds xW X Toolkit Athena Widgets \- C Language Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.ds Rn 3
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.ds Vn 2.2
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.hw XtDisplay-Initialize XtOpen-Display XtClose-Display XtDatabase XtScreen-Database wid-get
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.ps \\n(PS
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.de De
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.fi
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..
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.de FD
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.LP
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.KS
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.de IN \" send an index entry to the stderr
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.de C{
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.KS
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.\" choose appropriate monospace font
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.\" the imagen conditional, 480,
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.\" may be changed to L if LB is too
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.\" heavy for your eyes...
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.\"
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.ie "\\*(.T"480" .ft L
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.el .ie "\\*(.T"300" .ft L
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.el .ie "\\*(.T"202" .ft PO
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..
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.de C}
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.DE
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.R
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.de Pn
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.ie t \\$1\fB\^\\$2\^\fR\\$3
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.el \\$1\fI\^\\$2\^\fP\\$3
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.de ZN
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.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
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. \" Note End -- doug kraft 3/85
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.de NE
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..
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.ny0
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.TH XtDisplayInitialize __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtDisplayInitialize, XtOpenDisplay, XtDatabase, XtScreenDatabase, XtCloseDisplay \- initialize, open, or close a display
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.SH SYNTAX
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.HP
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void XtDisplayInitialize(XtAppContext \fIapp_context\fP, Display
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*\fIdisplay\fP, String \fIapplication_name\fP, String \fIapplication_class\fP,
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XrmOptionDescRec *\fIoptions\fP, Cardinal \fInum_options\fP, int *\fIargc\fP,
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String *\fIargv\fP);
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.HP
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Display *XtOpenDisplay(XtAppContext \fIapp_context\fP, String
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\fIdisplay_string\fP, String \fIapplication_name\fP, String
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\fIapplication_class\fP, XrmOptionDescRec *\fIoptions\fP, Cardinal
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\fInum_options\fP, int *\fIargc\fP, String *\fIargv\fP);
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.HP
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void XtCloseDisplay(Display *\fIdisplay\fP);
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.HP
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XrmDatabase XtDatabase(Display *\fIdisplay\fP);
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.HP
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XrmDatabase XtScreenDatabase(Screen* \fIscreen\fP);
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.SH ARGUMENTS
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.IP \fIargc\fP 1i
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Specifies a pointer to the number of command line parameters.
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.IP \fIargv\fP 1i
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Specifies the command line parameters.
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.IP \fIapp_context\fP 1i
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Specifies the application context.
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.ds Ac , which usually is the generic name for all instances of this application
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.IP \fIapplication_class\fP 1i
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Specifies the class name of this application\*(Ac.
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.IP \fIapplication_name\fP 1i
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Specifies the name of the application instance.
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.IP \fIdisplay\fP 1i
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Specifies the display\*(Di.
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Note that a display can be in at most one application context.
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.IP \fInum_options\fP 1i
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Specifies the number of entries in the options list.
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.IP \fIoptions\fP 1i
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Specifies how to parse the command line for any application-specific resources.
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The options argument is passed as a parameter to
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.ZN XrmParseCommand .
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For further information,
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see \fI\*(xL\fP.
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.IP \fIscreen\fP 1i
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Specifies the screen whose resource database is to be returned.
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.SH DESCRIPTION
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The
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.ZN XtDisplayInitialize
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function builds the resource database, calls the Xlib
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.ZN XrmParseCommand
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function to parse the command line,
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and performs other per display initialization.
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After
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.ZN XrmParseCommand
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has been called,
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argc and argv contain only those parameters that
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were not in the standard option table or in the table specified by the
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options argument.
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If the modified argc is not zero,
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most applications simply print out the modified argv along with a message
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listing the allowable options.
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On UNIX-based systems,
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the application name is usually the final component of argv[0].
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If the synchronize resource is
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.ZN True
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for the specified application,
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.ZN XtDisplayInitialize
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calls the Xlib
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.ZN XSynchronize
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function to put Xlib into synchronous mode for this display connection.
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If the reverseVideo resource is
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.ZN True ,
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the \*(xI exchange
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.ZN XtDefaultForeground
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and
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.ZN XtDefaultBackground
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for widgets created on this display.
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(See Section 9.6.1).
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.LP
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The
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.ZN XtOpenDisplay
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function calls
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.ZN XOpenDisplay
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the specified display name.
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If display_string is NULL,
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.ZN XtOpenDisplay
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uses the current value of the \-display option specified in argv
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and if no display is specified in argv,
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uses the user's default display (on UNIX-based systems,
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this is the value of the DISPLAY environment variable).
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.LP
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If this succeeds, it then calls
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.ZN XtDisplayInitialize
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and pass it the opened display and
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the value of the \-name option specified in argv as the application name.
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If no name option is specified,
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it uses the application name passed to
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.ZN XtOpenDisplay .
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If the application name is NULL,
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it uses the last component of argv[0].
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.ZN XtOpenDisplay
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returns the newly opened display or NULL if it failed.
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.LP
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.ZN XtOpenDisplay
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is provided as a convenience to the application programmer.
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.LP
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The
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.ZN XtCloseDisplay
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function closes the specified display as soon as it is safe to do so.
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If called from within an event dispatch (for example, a callback procedure),
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.ZN XtCloseDisplay
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does not close the display until the dispatch is complete.
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Note that applications need only call
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.ZN XtCloseDisplay
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if they are to continue executing after closing the display;
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otherwise, they should call
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.ZN XtDestroyApplicationContext
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or just exit.
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.LP
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The
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.ZN XtDatabase
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function returns the fully merged resource database that was built by
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.ZN XtDisplayInitialize
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associated with the display that was passed in.
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If this display has not been initialized by
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.ZN XtDisplayInitialize ,
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the results are not defined.
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.LP
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The
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.ZN XtScreenDatabase
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function returns the fully merged resource database associated with the
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specified screen. If the \fIscreen\fP does not belong to a
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.ZN Display
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initialized by
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.ZN XtDisplayInitialize ,
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the results are undefined.
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.SH "SEE ALSO"
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XtAppCreateShell(__libmansuffix__),
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XtCreateApplicationContext(__libmansuffix__)
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.br
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\fI\*(xT\fP
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.br
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\fI\*(xL\fP
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