Tk_Main(3) Tk Library Procedures Tk_Main(3)
NAME
Tk_Main - main program for Tk-based applications
SYNOPSIS
#include <tk.h>
Tk_Main(argc, argv, appInitProc)
ARGUMENTS
Number of elements in argv. Array of strings containing command-line
arguments. On Windows, when using -DUNICODE, the parameter type changes
to wchar_t *. Address of an application-specific initialization proce-
dure. 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 argu-
ment. This procedure provides a 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 interac-
tive uses events registered with Tcl_CreateFileHandler to process user
input.
SEE ALSO
Tcl_DoOneEvent(3)
KEYWORDS
application-specific initialization, command-line arguments, main pro-
gram
Tk 4.0 Tk_Main(3)
tk 8.6.0 - Generated Sat Jan 19 10:39:44 CST 2013