/* 
 * tkWin32Dll.c --
 *
 *	This file contains a stub dll entry point.
 *
 * Copyright (c) 1995 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkWin32Dll.c,v 1.3 1999/04/16 01:51:48 stanton Exp $
 */

#include "tkWinInt.h"

static int tkPlatformId;

/*
 * The following declaration is for the VC++ DLL entry point.
 */

BOOL APIENTRY		DllMain _ANSI_ARGS_((HINSTANCE hInst,
			    DWORD reason, LPVOID reserved));

/*
 *----------------------------------------------------------------------
 *
 * DllEntryPoint --
 *
 *	This wrapper function is used by Borland to invoke the
 *	initialization code for Tk.  It simply calls the DllMain
 *	routine.
 *
 * Results:
 *	See DllMain.
 *
 * Side effects:
 *	See DllMain.
 *
 *----------------------------------------------------------------------
 */

BOOL APIENTRY
DllEntryPoint(hInst, reason, reserved)
    HINSTANCE hInst;		/* Library instance handle. */
    DWORD reason;		/* Reason this function is being called. */
    LPVOID reserved;		/* Not used. */
{
    return DllMain(hInst, reason, reserved);
}

/*
 *----------------------------------------------------------------------
 *
 * DllMain --
 *
 *	DLL entry point.
 *
 * Results:
 *	TRUE on sucess, FALSE on failure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

BOOL APIENTRY
DllMain(hInstance, reason, reserved)
    HINSTANCE hInstance;
    DWORD reason;
    LPVOID reserved;
{
    OSVERSIONINFO os;

    /*
     * If we are attaching to the DLL from a new process, tell Tk about
     * the hInstance to use. If we are detaching then clean up any
     * data structures related to this DLL.
     */
    
    if (reason == DLL_PROCESS_ATTACH) {
	os.dwOSVersionInfoSize = sizeof(os);
	GetVersionEx(&os);
	tkPlatformId = os.dwPlatformId;

        TkWinXInit(hInstance);
    } else if (reason == DLL_PROCESS_DETACH) {
        TkWinXCleanup(hInstance);
    }
    return(TRUE);
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinGetPlatformId --
 *
 *	Determines whether running under NT, 95, or Win32s, to allow 
 *	runtime conditional code.
 *
 * Results:
 *	The return value is one of:
 *	    VER_PLATFORM_WIN32s		Win32s on Windows 3.1. 
 *	    VER_PLATFORM_WIN32_WINDOWS	Win32 on Windows 95.
 *	    VER_PLATFORM_WIN32_NT	Win32 on Windows NT
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int		
TkWinGetPlatformId()
{
    return tkPlatformId;
}