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Tcl_AppInit is invoked after by Tcl_Main and Tk_Main after their own initialization and before entering the main loop to process commands. Here are some examples of things that Tcl_AppInit might do:
Tcl_AppInit returns TCL_OK or TCL_ERROR. If it returns TCL_ERROR then it must leave an error message in interp->result; otherwise the result is ignored.
In addition to Tcl_AppInit, your application should also contain a procedure main that calls Tcl_Main as follows:
Tcl_Main(argc, argv, Tcl_AppInit);The third argument to Tcl_Main gives the address of the application-specific initialization procedure to invoke. This means that you don't have to use the name Tcl_AppInit for the procedure, but in practice the name is nearly always Tcl_AppInit (in versions before Tcl 7.4 the name Tcl_AppInit was implicit; there was no way to specify the procedure explicitly). The best way to get started is to make a copy of the file tclAppInit.c from the Tcl library or source directory. It already contains a main procedure and a template for Tcl_AppInit that you can modify for your application.
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