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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 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 initializa-tion initialization
              tion 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 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.


KEYWORDS
       application, argument, command, initialization, interpreter



Tcl                                                  7.0                                      Tcl_AppInit(3)