Tk_Main(3) Tk Library Procedures Tk_Main(3)_________________________________________________________________NAMETk_Main - main program for Tk-based applications
SYNOPSIS
#include <tk.h>
Tk_Main(argc, argv, appInitProc)
ARGUMENTS
int argc (in) Number of ele-
ments in argv.
char *argv[] (in) Array of
strings con-
taining com-
mand-line argu-
ments.
Tcl_AppInitProc *appInitProc (in) Address of an
application-
specific ini-
tialization
procedure. The
value for this
argument is
usually
Tcl_AppInit.
_________________________________________________________________DESCRIPTIONTk_Main acts as the main program for most Tk-based appli-
cations. Starting with Tk 4.0 it is not called main any-
more 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 applica-
tion.
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 initial-
ization, 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);
Tk 4.0 1
Tk_Main(3) Tk Library Procedures Tk_Main(3)
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 argu-
ments, main program
Tk 4.0 2
