Tcl_AppInit man page on Manjaro

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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 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 initial‐
       ization	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  ini‐

       [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.

       [4]    Use the routines Tcl_SetStartupScript  and  Tcl_GetStartupScript
	      to  set  or query the file and encoding that the active Tcl_Main
	      or Tk_Main routine will use as a startup script.

       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;	other‐
       wise the result is ignored.

       In addition to Tcl_AppInit, your application should also contain a pro‐
       cedure 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 proce‐
       dure 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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