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Tcl_AppInit(3)			      Tcl Library Procedures			   Tcl_AppInit(3)


       Tcl_AppInit - perform application-specific initialization

       #include <tcl.h>


       Tcl_Interp *interp (in)		Interpreter for the application.

       Tcl_AppInit  is	a  "hook" procedure that is invoked by the main programs for Tcl applica-
       tions 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 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  initializa-
       tion procedure to invoke.  This means that you do not 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.

       application, argument, command, initialization, interpreter

Tcl					       7.0				   Tcl_AppInit(3)
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