/*
 * Name: Simple Window Information Inspector
 * Description:
 *     This program shows the window information hierarchy from the current
 *     cursor position one time per second. Press Ctrl+C to quit.
 * Author: Katayama Hirofumi MZ
 * License: The MIT License
 * Copyright (C) 2013 Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
 */
#include <windows.h>
#include <stdio.h>

/* get the depth from a child window */
INT GetDepth(HWND hwnd, INT nLevel)
{
    HWND hwndParent = GetParent(hwnd);
    if (hwndParent != NULL)
    {
        return GetDepth(hwndParent, nLevel + 1);
    }
    return nLevel;
}

/* inspect window information */
VOID InspectWindowInfo(HWND hwnd, INT nDepth)
{
    WCHAR szClass[32], szText[32], szBuff[MAX_PATH];
    CHAR szAnsi[MAX_PATH];
    DWORD style;
    HWND hwndParent;
    INT i;

    /* recurse the ancestor windows */
    hwndParent = GetParent(hwnd);
    if (hwndParent != NULL)
    {
        InspectWindowInfo(hwndParent, nDepth - 1);
    }

    /* get class name */
    GetClassNameW(hwnd, szClass, 32);
    szClass[32 - 1] = 0;

    /* get window text */
    GetWindowTextW(hwnd, szText, 32);
    szText[32 - 1] = 0;

    /* get window style */
    style = GetWindowLong(hwnd, GWL_STYLE);

    /* indent */
    for (i = 0; i < nDepth; i++)
    {
        printf("  ");
    }

    /* do output */
    wsprintfW(szBuff, L"HWND:0x%08X, CLASS:\"%s\", TEXT:\"%s\", STYLE:0x%08X\n",
              (DWORD)hwnd, szClass, szText, style);
    WideCharToMultiByte(CP_ACP, 0, szBuff, -1, szAnsi, MAX_PATH, NULL, NULL);
    printf("%s", szAnsi);
}

/* the main function */
VOID main(VOID)
{
    /* the position */
    POINT pt;
    /* window handles */
    HWND hwnd, hwndChild;
    /* flags for ChildWindowFromPointEx */
    UINT uCWP_ = CWP_SKIPINVISIBLE | CWP_SKIPTRANSPARENT;

    /* infinite loop */
    for (;;)
    {
        /* get current cursor position */
        GetCursorPos(&pt);

        /* do output a separator */
        printf("--------------------------\n");

        /* get the top-level window from the cursor position */
        hwnd = WindowFromPoint(pt);

        /* get the deepest descendant window from the cursor position */
        for (;; hwnd = hwndChild)
        {
            /* get the child window of the specified window from the position */
            hwndChild = ChildWindowFromPointEx(hwnd, pt, uCWP_);
            /* end if no other child window found */
            if (hwndChild == NULL || hwnd == hwndChild)
                break;

            /* convert the position */
            MapWindowPoints(hwnd, hwndChild, &pt, 1);
        }

        /* inspect window information */
        InspectWindowInfo(hwnd, GetDepth(hwnd, 0));

        /* wait one second */
        Sleep(1000);
    }
}