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Tcl_Main(3)          Tcl Library Procedures                   7.4



Tcl_Main - main program for Tcl-based applications


#include <tcl.h> Tcl_Main(argc, argv, appInitProc)


int argc (in) Number of ele- ments in argv. char *argv[] (in) Array of strings containing command-line arguments. Tcl_AppInitProc *appInitProc (in) Address of an application- specific initial- ization pro- cedure. The value for this argument is usu- ally Tcl_AppInit. _________________________________________________________________


Tcl_Main acts as the main program for most Tcl-based appli- cations. Starting with Tcl 7.4 it is not called main anymore because it is part of the Tcl library and having a function main in a library (particularly a shared library) causes problems on many systems. Having main in the Tcl library would also make it hard to use Tcl 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 Tcl_Main. Tcl_Main then does all the work of creating and running a tclsh-like applica- tion. When it is has finished its own initialization, but before it processes commands, Tcl_Main calls the procedure given by the appInitProc argument. This procedure provides a ``hook'' for the application to perform its own initializa- tion, 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); Tcl 1 Tcl_Main(3) Tcl Library Procedures 7.4 AppInitProc is almost always a pointer to Tcl_AppInit; for more details on this procedure, see the documentation for Tcl_AppInit.


application-specific initialization, command-line arguments, main program Tcl 2 Prepared by Ready-to-Run Software, Inc.


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