74 lines
2.7 KiB
Groff
74 lines
2.7 KiB
Groff
|
'\"
|
||
|
|
'\" Copyright (c) 1993 The Regents of the University of California.
|
||
|
|
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
|
||
|
|
'\"
|
||
|
|
'\" See the file "license.terms" for information on usage and redistribution
|
||
|
|
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||
|
|
'\"
|
||
|
|
'\" SCCS: @(#) AppInit.3 1.10 96/08/26 12:59:40
|
||
|
|
'\"
|
||
|
|
.so man.macros
|
||
|
|
.TH Tcl_AppInit 3 7.0 Tcl "Tcl Library Procedures"
|
||
|
|
.BS
|
||
|
|
.SH NAME
|
||
|
|
Tcl_AppInit \- perform application-specific initialization
|
||
|
|
.SH SYNOPSIS
|
||
|
|
.nf
|
||
|
|
\fB#include <tcl.h>\fR
|
||
|
|
.sp
|
||
|
|
int
|
||
|
|
\fBTcl_AppInit\fR(\fIinterp\fR)
|
||
|
|
.SH ARGUMENTS
|
||
|
|
.AS Tcl_Interp *interp
|
||
|
|
.AP Tcl_Interp *interp in
|
||
|
|
Interpreter for the application.
|
||
|
|
.BE
|
||
|
|
|
||
|
|
.SH DESCRIPTION
|
||
|
|
.PP
|
||
|
|
\fBTcl_AppInit\fR is a ``hook'' procedure that is invoked by
|
||
|
|
the main programs for Tcl applications such as \fBtclsh\fR and \fBwish\fR.
|
||
|
|
Its purpose is to allow new Tcl applications to be created without
|
||
|
|
modifying the main programs provided as part of Tcl and Tk.
|
||
|
|
To create a new application you write a new version of
|
||
|
|
\fBTcl_AppInit\fR to replace the default version provided by Tcl,
|
||
|
|
then link your new \fBTcl_AppInit\fR with the Tcl library.
|
||
|
|
.PP
|
||
|
|
\fBTcl_AppInit\fR is invoked after by \fBTcl_Main\fR and \fBTk_Main\fR
|
||
|
|
after their own initialization and before entering the main loop
|
||
|
|
to process commands.
|
||
|
|
Here are some examples of things that \fBTcl_AppInit\fR might do:
|
||
|
|
.IP [1]
|
||
|
|
Call initialization procedures for various packages used by
|
||
|
|
the application.
|
||
|
|
Each initialization procedure adds new commands to \fIinterp\fR
|
||
|
|
for its package and performs other package-specific initialization.
|
||
|
|
.IP [2]
|
||
|
|
Process command-line arguments, which can be accessed from the
|
||
|
|
Tcl variables \fBargv\fR and \fBargv0\fR in \fIinterp\fR.
|
||
|
|
.IP [3]
|
||
|
|
Invoke a startup script to initialize the application.
|
||
|
|
.LP
|
||
|
|
\fBTcl_AppInit\fR returns TCL_OK or TCL_ERROR.
|
||
|
|
If it returns TCL_ERROR then it must leave an error message in
|
||
|
|
\fIinterp->result\fR; otherwise the result is ignored.
|
||
|
|
.PP
|
||
|
|
In addition to \fBTcl_AppInit\fR, your application should also contain
|
||
|
|
a procedure \fBmain\fR that calls \fBTcl_Main\fR as follows:
|
||
|
|
.CS
|
||
|
|
Tcl_Main(argc, argv, Tcl_AppInit);
|
||
|
|
.CE
|
||
|
|
The third argument to \fBTcl_Main\fR gives the address of the
|
||
|
|
application-specific initialization procedure to invoke.
|
||
|
|
This means that you don't have to use the name \fBTcl_AppInit\fR
|
||
|
|
for the procedure, but in practice the name is nearly always
|
||
|
|
\fBTcl_AppInit\fR (in versions before Tcl 7.4 the name \fBTcl_AppInit\fR
|
||
|
|
was implicit; there was no way to specify the procedure explicitly).
|
||
|
|
The best way to get started is to make a copy of the file
|
||
|
|
\fBtclAppInit.c\fR from the Tcl library or source directory.
|
||
|
|
It already contains a \fBmain\fR procedure and a template for
|
||
|
|
\fBTcl_AppInit\fR that you can modify for your application.
|
||
|
|
|
||
|
|
.SH KEYWORDS
|
||
|
|
application, argument, command, initialization, interpreter
|