Tcl_AppInit(3)						      Tcl Library Procedures						    Tcl_AppInit(3)

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NAME

       Tcl_AppInit - perform application-specific initialization

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_AppInit(interp)

ARGUMENTS

       Tcl_Interp   *interp   (in)	Interpreter for the application.
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DESCRIPTION

       Tcl_AppInit  is	a  ``hook'' procedure that is invoked by the main programs for Tcl applications such as tclsh and wish.  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 Tcl_AppInit to replace the default version provided by Tcl, then link your new Tcl_AppInit with the Tcl library.

       Tcl_AppInit  is invoked after by Tcl_Main and Tk_Main after their own initialization and before entering the main loop to process commands.
       Here are some examples of things that Tcl_AppInit might do:

       [1]    Call initialization procedures for various packages used by the application.  Each initialization procedure  adds  new  commands	to
	      interp for its package and performs other package-specific initialization.

       [2]    Process command-line arguments, which can be accessed from the Tcl variables argv and argv0 in interp.

       [3]    Invoke a startup script to initialize the application.

       Tcl_AppInit  returns  TCL_OK  or  TCL_ERROR.   If it returns TCL_ERROR then it must leave an error message in for the interpreter's result;
       otherwise the result is ignored.

       In addition to Tcl_AppInit, your application should also contain a procedure main that calls Tcl_Main as follows:
	      Tcl_Main(argc, argv, Tcl_AppInit);
       The third argument to Tcl_Main gives the address of the application-specific initialization procedure to invoke.  This means that you don't
       have  to  use the name Tcl_AppInit for the procedure, but in practice the name is nearly always Tcl_AppInit (in versions before Tcl 7.4 the
       name Tcl_AppInit 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  tclAppInit.c from the Tcl library or source directory.  It already contains a main procedure and a template for Tcl_AppInit that
       you can modify for your application.

KEYWORDS

       application, argument, command, initialization, interpreter

Tcl									7.0							    Tcl_AppInit(3)