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/*
notifychanges.c - Notify win32 subsystem and running programs of globals
changes such as system environment variables.
Copyright (c) 2015, Amit Bakshi <ambakshi at gmail dot com>
All rights reserved.
Distributed under the BSD License. See included LICENSE for details.
*/

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0503
#endif

#include <windows.h>
#include <shlobj.h>
#include <stdlib.h>

#ifdef _MSC_VER
#pragma comment(lib,"user32.lib")
#pragma comment(lib,"shell32.lib")
#pragma comment(lib,"kernel32.lib")
#endif

int Win32_Notifychanges() {
    DWORD* dwRes;
    const char* lParam = "Environment";
    int timeout = 5, r;

    SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_FLUSH, 0, 0); // Works on both dir and file
    // SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, 0, 0); // Behavior is same as the above
    // SHChangeNotify(SHCNE_UPDATEDIR, SHCNF_IDLIST, 0, 0); // No effect

     //Both no effects.
    r = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, (LPARAM)lParam, SMTO_BLOCK, timeout * 1000, NULL);
    printf("r %d\n", r);
    if (r != 0) {
        r = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, 0, SMTO_BLOCK, timeout * 1000, NULL) != 0;
        printf("r again %d\n", r);
    }
    return r;
    return 0;
}

int main()
{
    Win32_Notifychanges();
    return 0;
}