.\" $Xorg: XtOpenApp.man,v 1.3 2000/08/17 19:42:01 cpqbld Exp $
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.ds tk X Toolkit
.ds xT X Toolkit Intrinsics \- C Language Interface
.ds xI Intrinsics
.ds xW X Toolkit Athena Widgets \- C Language Interface
.ds xL Xlib \- C Language X Interface
.ds xC Inter-Client Communication Conventions Manual
.ds Rn 3
.ds Vn 2.2
.hw XtOpen-Application XtVa-Open-Application
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.TH XtOpenApplication 3Xt __xorgversion__ "XT FUNCTIONS"
.SH NAME
XtOpenApplication, XtVaOpenApplication \- initialize, open, or close a display
.SH SYNTAX
.HP
Widget XtOpenApplication(XtAppContext *\fIapp_context_return\fP, String
\fIapplication_class\fP, XrmOptionDescRec *\fIoptions\fP, Cardinal
\fInum_options\fP, int *\fIargc_in_out\fP, String *\fIargv_in_out\fP, String 
*\fIfallback_resources\fP, WidgetClass \fIwidget_class\fP, ArgList \fIargs\fP,
Cardinal \fInum_args\fP); 
.HP
Widget XtVaOpenApplication(XtAppContext *\fIapp_context_return\fP, String
\fIapplication_class\fP, XrmOptionDescRec *\fIoptions\fP, Cardinal
\fInum_options\fP, int *\fIargc_in_out\fP, String *\fIargv_in_out\fP, String 
*\fIfallback_resources\fP, WidgetClass \fIwidget_class\fP, ...\^); 
.SH ARGUMENTS
.IP \fIapp_context_return\fP 1i
Specifies the application context.
.ds Ac , which usually is the generic name for all instances of this application
.IP \fIapplication_class\fP 1i
Specifies the class name of this application\*(Ac.
.IP \fIoptions\fP 1i
Specifies how to parse the command line for any application-specific resources.
The options argument is passed as a parameter to
.ZN XrmParseCommand .
For further information,
see \fI\*(xL\fP.
.IP \fInum_options\fP 1i
Specifies the number of entries in the options list.
.IP \fIargc_in_out\fP 1i
Specifies a pointer to the number of command line parameters.
.IP \fIargv_in_out\fP 1i
Specifies the command line parameters.
.IP \fIfallback_resources\fP 1i
Specifies resource values to be used if the application class resource
file cannot be opened or read, or NULL.
.IP \fIwidget_class\fP 1i
Specifies the widget class of the shell to be created.
.IP \fIargs\fP 1i
Specifies the argument list to override any other resource specification
for the created shell widget.
.IP \fInum_args\fP 1i
Specifies the number of entries in the argument list.
.IP \fI...\fP 1i
Specifies the variable argument list to override any other resource 
specification for the created shell widget.
.SH DESCRIPTION
The
.ZN XtOpenApplication
function calls
.ZN XtToolkitInitialize
followed by
.ZN XtCreateApplicationContext ,
then calls
.ZN XtOpenDisplay
with \fIdisplay_string\fP NULL and \fIapplication_name\fP NULL, and
finally calls
.ZN XtAppCreateShell
with \fIapplication_name\fP NULL, the specified \fIwidget_class\fP,
and the specified \fIargs\fP and \fInum_args\fP and returns the
created shell. The modified \fIargc\fP and \fIargv\fP returned by
.ZN XtDisplayInitialize
are returned in \fIargc_in_out\fP and \fIargv_in_out\fP. If
\fIapp_context_return\fP is not NULL, the created application context
is also returned. If the display specified by the command line cannot
be opened, an error message is issued and
.ZN XtOpenApplication
terminates the application. If \fIfallback_resources\fP is non-NULL,
.ZN XtAppSetFallbackResources
is called with the value prior to calling
.ZN XtOpenDisplay .
.LP
XtAppInitialize and XtVaAppInitialize have been superceded by
.ZN XtOpenApplication
and
.ZN XtVaOpenApplication
respectively.
.SH "SEE ALSO"
XtAppInitialize(3Xt), XtVaAppInitialize(3Xt)
.br
\fI\*(xT\fP
.br
\fI\*(xL\fP