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. On Windows,
when using -DUNICODE, the
parameter type changes to
wchar_t *.

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.

Tk_Main functions much the same as Tcl_Main. In particular, Tk_Main
supports both an interactive mode and a startup script mode, with the
file name and encoding of a startup script under the control of the
Tcl_SetStartupScript and Tcl_GetStartupScript routines. However it
calls Tk_MainLoop after processing any supplied script, and in
interactive uses events registered with Tcl_CreateFileHandler to
process user input.

SEE ALSO

Tcl_DoOneEvent(3)

KEYWORDS

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

Tk 4.0 Tk_Main(3)