Tk_Main(3)

💖 Tk_Main(3) — main program for Tk-based apps 💖

okay bestie, welcome to the Tk Library Procedures page for Tk_Main(3) — the little main-program moment that makes your Tk app go from “cute idea” to “actually running” ✨

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🎀 NAME 🎀

Tk_Main — main program for Tk-based applications 💅

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🦋 SYNOPSIS 🦋

#include <tk.h>

Tk_Main(argc, argv, appInitProc)

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🌸 ARGUMENTS 🌸

• Tcl_Size argc (in) — Number of elements in argv. literally how many command-line besties you’re passing in 🫶
• char *argv[] (in) — Array of strings containing command-line arguments. On Windows, when using -DUNICODE, the parameter type changes to wchar_t *. yes, the plot twist is Windows-specific 😭
• Tcl_AppInitProc *appInitProc (in) — Address of an application-specific initialization procedure. The value for this argument is usually Tcl_AppInit. this is the little hook where your app gets its own personality 💖

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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. no cap, that’s the whole reason for the name glow-up 💀

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. it’s giving “tiny doorway, entire main character house behind it” 👑

When it’s 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. 💫

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 interactive it uses events registered with Tcl_CreateFileHandler to process user input. lowkey iconic event-loop behavior 🌀

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🌈 SEE ALSO 🌈

• Tcl_DoOneEvent(3)

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👑 KEYWORDS 👑

• application-specific initialization
• command-line arguments
• main program

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bestie, that’s the whole vibe: Tk_Main is the main-program setup queen, and appInitProc is where your app gets to add its own sparkle 🎀

brought to you by Tk 4.0 and the iconic Tk_Main(3) — periodt 💅✨