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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 -DUNI-
CODE, the parameter type
changes to wchar_t *.
Tcl_AppInitProc *appInitProc (in) Address of an application-
specific initialization pro-
cedure. 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 argu-
ment. 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_AppInit-
Proc:
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)
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