267 lines
6.1 KiB
Plaintext
267 lines
6.1 KiB
Plaintext
.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 XtMake-Geometry-Request XtQuery-Geometry 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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.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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. \" Note End -- doug kraft 3/85
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..
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.ny0
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.TH XtDisplayInitialize 3Xt "Release 3" "X Version 11" "XT FUNCTIONS"
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.SH NAME
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XtDisplayInitialize, XtOpenDisplay, XtDatabase, XtCloseDisplay \- initialize, open, or close a display
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.SH SYNTAX
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void XtToolkitInitialize()
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.LP
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void XtDisplayInitialize(\fIapp_context\fP, \fIdisplay\fP, \
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\fIapplication_name\fP, \fIapplication_class\fP,
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.br
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\fIoptions\fP, \fInum_options\fP, \fIargc\fP, \fIargv\fP)
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.br
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XtAppContext \fIapp_context\fP;
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.br
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Display *\fIdisplay\fP;
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.br
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String \fIapplication_name\fP;
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.br
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String \fIapplication_class\fP;
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.br
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XrmOptionDescRec *\fIoptions\fP;
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.br
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Cardinal \fInum_options\fP;
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.br
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Cardinal *\fIargc\fP;
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.br
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String *\fIargv\fP;
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.LP
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Display *XtOpenDisplay(\fIapp_context\fP, \fIdisplay_string\fP, \
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\fIapplication_name\fP, \fIapplication_class\fP,
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.br
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\fIoptions\fP, \fInum_options\fP, \fIargc\fP, \fIargv\fP)
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.br
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XtAppContext \fIapp_context\fP;
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.br
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String \fIdisplay_string\fP;
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.br
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String \fIapplication_name\fP;
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.br
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String \fIapplication_class\fP;
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.br
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XrmOptionDescRec *\fIoptions\fP;
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.br
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Cardinal \fInum_options\fP;
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.br
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Cardinal *\fIargc\fP;
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.br
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String *\fIargv\fP;
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.LP
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void XtCloseDisplay(\fIdisplay\fP)
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.br
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Display *\fIdisplay\fP;
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.LP
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XrmDatabase XtDatabase(\fIdisplay\fP)
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.br
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Display *\fIdisplay\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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.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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.SH "SEE ALSO"
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XtAppCreateShell(3Xt),
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XtCreateApplicationContext(3Xt)
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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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