tk_main(3) [centos man page]

Tk_Main(3)						       Tk Library Procedures							Tk_Main(3)

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NAME

       Tk_Main - main program for Tk-based applications

SYNOPSIS

       #include <tk.h>

       Tk_Main(argc, argv, appInitProc)

ARGUMENTS

       int argc (in)				  Number of elements in argv.

       char *argv[] (in)			  Array of strings containing command-line arguments.

       Tcl_AppInitProc *appInitProc (in)	  Address  of  an  application-specific  initialization procedure.  The value for this argument is
						  usually Tcl_AppInit.
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DESCRIPTION

       Tk_Main acts as the main program for most Tk-based applications.  Starting with Tk 4.0 it is not called main anymore because it is part	of
       the Tk library and having a function main in a library (particularly a shared library) causes problems on many systems.	Having main in the
       Tk library would also make it hard to use Tk in C++ programs, since C++ programs must have special C++ main functions.

       Normally each application contains a small main function that does nothing but invoke Tk_Main.  Tk_Main then does all the work of  creating
       and running a wish-like application.

       When  it  is  has  finished  its own initialization, but before it processes commands, Tk_Main calls the procedure given by the appInitProc
       argument.  This procedure provides a "hook" for the application to perform its own initialization, such	as  defining  application-specific
       commands.  The procedure must have an interface that matches the type Tcl_AppInitProc:
	      typedef int Tcl_AppInitProc(Tcl_Interp *interp);
       AppInitProc is almost always a pointer to Tcl_AppInit; for more details on this procedure, see the documentation for Tcl_AppInit.

KEYWORDS

       application-specific initialization, command-line arguments, main program

Tk									4.0								Tk_Main(3)

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 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	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)