05-28-2007
Thanks again. Further to this, why is "void" used as a parameter in a function that takes no arguments, i.e.
int main (void)
I see this a bit in C (I started out learning C++) , why not just use
int main()
?
Is main a special case, or do you always use void in this way in a function that takes no arguments?
Which of the following is correct in C?
myFunction(void)
OR
myFunction()
?
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LEARN ABOUT OPENSOLARIS
tk_main
Tk_Main(3TK) Tk Library Procedures Tk_Main(3TK)
__________________________________________________________________________________________________________________________________________________
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.
_________________________________________________________________
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
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWTk |
+--------------------+-----------------+
|Interface Stability | Uncommitted |
+--------------------+-----------------+
NOTES
Source for Tk is available on http://opensolaris.org.
Tk 4.0 Tk_Main(3TK)