winhello.c

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/*
 *  ReactOS Winhello - Not So Simple Win32 Windowing test
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
/* What do we test with this app?
 * - Windows and Class creation
 * - A Simple Button
 * - Some font rendering in the Window
 * - Scrollbar support
 * - Hotkeys
 * - Messageboxes
 * ????????
 */
 
#ifndef VK_C
#define VK_C 'C'
#endif
 
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
 
HFONT tf;
LRESULT WINAPI MainWndProc(HWND, UINT, WPARAM, LPARAM);
BOOLEAN bolWM_CHAR;
BOOLEAN bolWM_KEYDOWN;
 
int WINAPI
WinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpszCmdLine,
    int nCmdShow)
{
  WNDCLASS wc;
  MSG msg;
  HWND hWnd;
  bolWM_CHAR = 0;
  bolWM_KEYDOWN = 0;
 
  wc.lpszClassName = "HelloClass";
  wc.lpfnWndProc = MainWndProc;
  wc.style = CS_VREDRAW | CS_HREDRAW;
  wc.hInstance = hInstance;
  wc.hIcon = LoadIcon(NULL, (LPCTSTR)IDI_APPLICATION);
  wc.hCursor = LoadCursor(NULL, (LPCTSTR)IDC_ARROW);
  wc.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);
  wc.lpszMenuName = NULL;
  wc.cbClsExtra = 0;
  wc.cbWndExtra = 0;
  if (RegisterClass(&wc) == 0)
    {
      fprintf(stderr, "RegisterClass failed (last error 0x%lX)\n",
          GetLastError());
      return(1);
    }
 
  hWnd = CreateWindow("HelloClass",
              "Hello World",
              WS_OVERLAPPEDWINDOW|WS_HSCROLL|WS_VSCROLL,
              0, //Position; you can use CW_USEDEFAULT, too
              0,
              600, //height
              400,
              NULL,
              NULL,
              hInstance,
              NULL);
  if (hWnd == NULL)
    {
      fprintf(stderr, "CreateWindow failed (last error 0x%lX)\n",
          GetLastError());
      return(1);
    }
 
    tf = CreateFontA(14, 0, 0, TA_BASELINE, FW_NORMAL, FALSE, FALSE, FALSE,
        ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
        DEFAULT_QUALITY, FIXED_PITCH|FF_DONTCARE, "Timmons");
 
  ShowWindow(hWnd, nCmdShow);
 
  while(GetMessage(&msg, NULL, 0, 0))
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
 
  DeleteObject(tf);
 
  return msg.wParam;
}
 
#define CTRLC 1 /* Define our HotKeys */
#define ALTF1 2 /* Define our HotKeys */
 
LRESULT CALLBACK MainWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
        PAINTSTRUCT   ps;    /* Also used during window drawing */
        HDC hDC;             /* A device context used for drawing */
        RECT rc = {0,0,0,0}, clr, wir;   /* A rectangle used during drawing */
        char spr[100], sir[100];
    static HBRUSH hbrWhite=NULL, hbrGray=NULL, hbrBlack=NULL, hbrRed=NULL, hbrBlue=NULL, hbrYellow=NULL;
 
        /* The window handle for the "Click Me" button. */
        static HWND   hwndButton = 0;
        static int    cx, cy;          /* Height and width of our button. */
 
    switch(msg)
    {
 
      case WM_CHAR:
      {
       TCHAR text[2];
       hDC = GetDC(hWnd);
       text[0] = (TCHAR)wParam;
       text[1] = _T('\0');
 
       //Write in window
       if( bolWM_KEYDOWN )
       {
                TextOut(hDC, 400, 10, "WM CHAR:", strlen("WM CHAR:"));
                bolWM_KEYDOWN = 0;
       }
       else
       {
            TextOut(hDC, 400, 10, "WM_CHAR:", strlen("WM_CHAR:"));
            bolWM_KEYDOWN = 1;
       }
       TextOut(hDC, 530, 10, text, strlen(text));
 
#if 0
       // Make a line depending on the typed key
       Rect.left = 10;
       Rect.top = 75;
       Rect.right = 610;
       Rect.bottom = 85;
       FillRect(hDC, &Rect, hbrWhite);
 
       Rect.left=308;
       Rect.right=312;
       FillRect(hDC, &Rect, hbrRed);
 
       Rect.left = 310;
       Rect.top = 75;
       Rect.right = 310 +text[0]*2;
       Rect.bottom = 85;
       HBRUSH hbrCustom = CreateSolidBrush ( RGB(text[0], text[0], text[0]));
       FillRect(hDC, &Rect, hbrCustom);
       DeleteObject ( hbrCustom );
 
#endif
 
       ReleaseDC(hWnd, hDC);
       return 0;
     }
 
      case WM_KEYDOWN:
      {
       RECT Rect;
       TCHAR text[2];
       hDC = GetDC(hWnd);
       text[0] = (TCHAR)wParam;
       text[1] = _T('\0');
 
 
       /* Write in window */
       Rect.left = 400;
       Rect.top = 50;
       Rect.right = 550;
       Rect.bottom = 70;
       FillRect(hDC, &Rect, hbrWhite);
       if( bolWM_CHAR )
       {
            TextOut(hDC, 400, 30, "WM KEYDOWN:", strlen("WM KEYDOWN:"));
            bolWM_CHAR = 0;
       }
       else
       {
            TextOut(hDC, 400, 30, "WM_KEYDOWN:", strlen("WM_KEYDOWN:"));
            bolWM_CHAR = 1;
       }
       TextOut(hDC, 530, 30, text, strlen(text));
       ReleaseDC(hWnd, hDC);
       return 0;
     }
 
      case WM_KEYUP:
      {
       RECT Rect;
       TCHAR text[2];
       hDC = GetDC(hWnd);
       text[0] = (TCHAR)wParam;
       text[1] = _T('\0');
 
 
       /* Write in window */
       Rect.left = 400;
       Rect.top = 10;
       Rect.right = 550;
       Rect.bottom = 70;
       FillRect(hDC, &Rect, hbrWhite);
       TextOut(hDC, 400, 50, "WM_KEYUP:", strlen("WM_KEYUP:"));
       TextOut(hDC, 530, 50, text, strlen(text));
       ReleaseDC(hWnd, hDC);
       return 0;
     }
 
 
        case WM_LBUTTONDOWN:
     {
       ULONG x, y;
       RECT Rect;
       hDC = GetDC(hWnd);
       x = LOWORD(lParam);
       y = HIWORD(lParam);
 
       Rect.left = x - 5;
       Rect.top = y - 5;
       Rect.right = x + 5;
       Rect.bottom = y + 5;
       FillRect(hDC, &Rect, hbrRed);
 
       Rect.left = x - 3;
       Rect.top = y - 3;
       Rect.right = x + 3;
       Rect.bottom = y + 3;
       FillRect(hDC, &Rect, hbrBlack);
 
           ReleaseDC(hWnd, hDC);
       break;
     }
        case WM_LBUTTONUP:
     {
       ULONG x, y;
       RECT Rect;
       hDC = GetDC(hWnd);
       x = LOWORD(lParam);
       y = HIWORD(lParam);
 
       Rect.left = x - 5;
       Rect.top = y - 5;
       Rect.right = x + 5;
       Rect.bottom = y + 5;
       FillRect(hDC, &Rect, hbrRed);
 
       Rect.left = x - 3;
       Rect.top = y - 3;
       Rect.right = x + 3;
       Rect.bottom = y + 3;
       FillRect(hDC, &Rect, hbrGray);
 
       ReleaseDC(hWnd, hDC);
       break;
     }
        case WM_MBUTTONDOWN:
     {
       ULONG x, y;
       RECT Rect;
       hDC = GetDC(hWnd);
       x = LOWORD(lParam);
       y = HIWORD(lParam);
 
       Rect.left = x - 5;
       Rect.top = y - 5;
       Rect.right = x + 5;
       Rect.bottom = y + 5;
       FillRect(hDC, &Rect, hbrBlue);
 
       Rect.left = x - 3;
       Rect.top = y - 3;
       Rect.right = x + 3;
       Rect.bottom = y + 3;
       FillRect(hDC, &Rect, hbrBlack);
 
       ReleaseDC(hWnd, hDC);
       break;
     }
        case WM_MBUTTONUP:
     {
       ULONG x, y;
       RECT Rect;
       hDC = GetDC(hWnd);
       x = LOWORD(lParam);
       y = HIWORD(lParam);
 
       Rect.left = x - 5;
       Rect.top = y - 5;
       Rect.right = x + 5;
       Rect.bottom = y + 5;
       FillRect(hDC, &Rect, hbrBlue);
 
       Rect.left = x - 3;
       Rect.top = y - 3;
       Rect.right = x + 3;
       Rect.bottom = y + 3;
       FillRect(hDC, &Rect, hbrGray);
 
       ReleaseDC(hWnd, hDC);
       break;
         }
        case WM_RBUTTONDOWN:
     {
       ULONG x, y;
       RECT Rect;
       hDC = GetDC(hWnd);
       x = LOWORD(lParam);
       y = HIWORD(lParam);
 
       Rect.left = x - 5;
       Rect.top = y - 5;
       Rect.right = x + 5;
       Rect.bottom = y + 5;
       FillRect(hDC, &Rect, hbrYellow);
 
       Rect.left = x - 3;
       Rect.top = y - 3;
       Rect.right = x + 3;
       Rect.bottom = y + 3;
       FillRect(hDC, &Rect, hbrBlack);
 
       ReleaseDC(hWnd, hDC);
       break;
     }
        case WM_RBUTTONUP:
     {
       ULONG x, y;
       RECT Rect;
       hDC = GetDC(hWnd);
       x = LOWORD(lParam);
       y = HIWORD(lParam);
 
       Rect.left = x - 5;
       Rect.top = y - 5;
       Rect.right = x + 5;
       Rect.bottom = y + 5;
       FillRect(hDC, &Rect, hbrYellow);
 
       Rect.left = x - 3;
       Rect.top = y - 3;
       Rect.right = x + 3;
       Rect.bottom = y + 3;
       FillRect(hDC, &Rect, hbrGray);
 
       ReleaseDC(hWnd, hDC);
       break;
     }
 
    case WM_MOUSEMOVE:
         {
          int fwKeys;
          int x;
          int y;
          RECT Rect;
          int temp;
      TCHAR text[256];
 
          hDC = GetDC(hWnd);
          fwKeys = wParam;        // key flags
          x = LOWORD(lParam);  // horizontal position of cursor
          y = HIWORD(lParam);  // vertical position of cursor
 
          Rect.left = 10;
      Rect.top = 100;
      Rect.right = 160;
      Rect.bottom = 300;
      FillRect(hDC, &Rect, hbrWhite);
 
          temp = _sntprintf ( text, sizeof(text)/sizeof(*text), _T("x: %d"), x );
      TextOut(hDC,10,100,text,strlen(text));
          temp = _sntprintf ( text, sizeof(text)/sizeof(*text), _T("y: %d"), y );
      TextOut(hDC,10,120,text,strlen(text));
 
          Rect.left = x - 2;
          Rect.top = y - 2;
          Rect.right = x + 2;
          Rect.bottom = y + 2;
 
          switch ( fwKeys )
          {
                case MK_CONTROL:
                       TextOut(hDC,10,140,"Control",strlen("Control"));
                       break;
                case MK_SHIFT:
                       TextOut(hDC,10,160,"Shift",strlen("Shift"));
                       break;
                case MK_LBUTTON:
                       TextOut(hDC,10,180,"Left",strlen("Left"));
                       FillRect(hDC, &Rect, hbrRed);
                       break;
                case MK_MBUTTON:
                       TextOut(hDC,10,200,"Middle",strlen("Middle"));
                   FillRect(hDC, &Rect, hbrBlue);
                       break;
                case MK_RBUTTON:
                       TextOut(hDC,10,220,"Right",strlen("Right"));
                   FillRect(hDC, &Rect, hbrYellow);
                       break;
           }
                       ReleaseDC(hWnd, hDC);
          break;
         }
 
    case WM_HSCROLL:
     {
      int nPos;
      int temp;
      RECT Rect;
      int nScrollCode;
      HWND hwndScrollBar;
      TCHAR text[256];
      SCROLLINFO Scrollparameter;
      nScrollCode = (int) LOWORD(wParam);  // scroll bar value
      nPos = (short int) HIWORD(wParam);   // scroll box position
      hwndScrollBar = (HWND) lParam;       // handle to scroll bar
      hDC = GetDC(hWnd);
 
          Scrollparameter.cbSize = sizeof(Scrollparameter);
          Scrollparameter.fMask = SIF_ALL;
          GetScrollInfo ( hWnd, SB_HORZ, &Scrollparameter );
 
          Rect.left = 200;
      Rect.top = 100;
      Rect.right = 350;
      Rect.bottom = 300;
      FillRect(hDC, &Rect, hbrWhite);
 
          switch ( nScrollCode )
          {
                case SB_ENDSCROLL: //Ends scroll.
                        TextOut(hDC,200,120,"SB_ENDSCROLL    ",16);
                    Scrollparameter.nPos = Scrollparameter.nPos;
                        break;
                case SB_LEFT: //Scrolls to the upper left.
                        TextOut(hDC,200,140,"SB_LEFT         ",16);
                    Scrollparameter.nPos = Scrollparameter.nMin;
                        break;
                case SB_RIGHT: //Scrolls to the lower right.
                        TextOut(hDC,200,160,"SB_RIGHT        ",16);
                    Scrollparameter.nPos = Scrollparameter.nMax;
                        break;
                case SB_LINELEFT: //Scrolls left by one unit.
                        TextOut(hDC,200,180,"SB_LINELEFT     ",16);
                    Scrollparameter.nPos--;
                        break;
                case SB_LINERIGHT: //Scrolls right by one unit.
                        TextOut(hDC,200,200,"SB_LINERIGHT    ",16);
                    Scrollparameter.nPos++;
                        break;
                case SB_PAGELEFT: //Scrolls left by the width of the window.
                        TextOut(hDC,200,220,"SB_PAGELEFT     ",16);
                        Scrollparameter.nPos -= Scrollparameter.nPage;
                        break;
                case SB_PAGERIGHT: //Scrolls right by the width of the window.
                        TextOut(hDC,200,240,"PAGERIGHT       ",16);
                        Scrollparameter.nPos += Scrollparameter.nPage;
                        break;
                case SB_THUMBPOSITION: //The user has dragged the scroll box (thumb) and released the mouse button. The nPos parameter indicates the position of the scroll box at the end of the drag operation.
                        TextOut(hDC,200,260,"SB_THUMBPOSITION",16);
                    Scrollparameter.nPos = Scrollparameter.nTrackPos;
                        break;
                case SB_THUMBTRACK: //
                        TextOut(hDC,200,280,"SB_THUMBTRACK   ",16);
                    Scrollparameter.nPos = Scrollparameter.nTrackPos;
                        break;
          }
 
       SetScrollInfo(
                 hWnd,    // handle to window with scroll bar
                 SB_HORZ,    // scroll bar flag
                 &Scrollparameter, // pointer to structure with scroll parameters
                 1 // redraw flag
           );
          temp = _sntprintf ( text, sizeof(text)/sizeof(*text), _T("Horizontal: %d"), Scrollparameter.nPos );
      TextOut(hDC,200,100,text,strlen(text));
          ReleaseDC(hWnd, hDC);
      return 0;
         }
 
    case WM_VSCROLL:
     {
      int nPos;
      int temp;
      RECT Rect;
      int nScrollCode;
      HWND hwndScrollBar;
      TCHAR text[256];
      SCROLLINFO Scrollparameter;
      nScrollCode = (int) LOWORD(wParam);  // scroll bar value
      nPos = (short int) HIWORD(wParam);   // scroll box position
      hwndScrollBar = (HWND) lParam;       // handle to scroll bar
      hDC = GetDC(hWnd);
 
          Scrollparameter.cbSize = sizeof(Scrollparameter);
          Scrollparameter.fMask = SIF_ALL;
          GetScrollInfo ( hWnd, SB_VERT, &Scrollparameter );
 
          Rect.left = 400;
      Rect.top = 100;
      Rect.right = 550;
      Rect.bottom = 300;
      FillRect(hDC, &Rect, hbrWhite);
 
          switch ( nScrollCode )
          {
                case SB_ENDSCROLL: //Ends scroll.
                        TextOut(hDC,400,120,"SB_ENDSCROLL    ",16);
                    Scrollparameter.nPos = Scrollparameter.nPos;
                    break;
                case SB_LEFT: //Scrolls to the upper left.
                        TextOut(hDC,400,140,"SB_LEFT         ",16);
                    Scrollparameter.nPos = Scrollparameter.nMin;
                        break;
                case SB_RIGHT: //Scrolls to the lower right.
                        TextOut(hDC,400,160,"SB_RIGHT        ",16);
                    Scrollparameter.nPos = Scrollparameter.nMax;
                        break;
                case SB_LINELEFT: //Scrolls left by one unit.
                        TextOut(hDC,400,180,"SB_LINELEFT     ",16);
                    Scrollparameter.nPos--;
                        break;
                case SB_LINERIGHT: //Scrolls right by one unit.
                        TextOut(hDC,400,200,"SB_LINERIGHT    ",16);
                    Scrollparameter.nPos++;
                        break;
                case SB_PAGELEFT: //Scrolls left by the width of the window.
                        TextOut(hDC,400,220,"SB_PAGELEFT     ",16);
                        Scrollparameter.nPos -= Scrollparameter.nPage;
                        break;
                case SB_PAGERIGHT: //Scrolls right by the width of the window.
                        TextOut(hDC,400,240,"PAGERIGHT       ",16);
                        Scrollparameter.nPos += Scrollparameter.nPage;
                        break;
                case SB_THUMBPOSITION: //The user has dragged the scroll box (thumb) and released the mouse button. The nPos parameter indicates the position of the scroll box at the end of the drag operation.
                        TextOut(hDC,400,260,"SB_THUMBPOSITION",16);
                    Scrollparameter.nPos = Scrollparameter.nTrackPos;
                        break;
                case SB_THUMBTRACK: //
                        TextOut(hDC,400,280,"SB_THUMBTRACK   ",16);
                    Scrollparameter.nPos = Scrollparameter.nTrackPos;
                        break;
          }
 
      SetScrollInfo(
                 hWnd,    // handle to window with scroll bar
                 SB_VERT,    // scroll bar flag
                 &Scrollparameter, // pointer to structure with scroll parameters
                 1 // redraw flag
          );
          temp = _sntprintf ( text, sizeof(text)/sizeof(*text), _T("Vertical: %d"), Scrollparameter.nPos );
      TextOut(hDC,400,100,text,strlen(text));
          ReleaseDC(hWnd, hDC);
      return 0;
      }
 
    case WM_HOTKEY:
     switch(wParam)
     {
          case CTRLC:
            MessageBox(hWnd, "You just pressed Ctrl+C", "Hotkey", MB_OK | MB_ICONINFORMATION);
            break;
          case ALTF1:
            MessageBox(hWnd, "You just pressed Ctrl+Alt+F1", "Hotkey", MB_OK | MB_ICONINFORMATION);
            break;
     }
     break;
 
    case WM_DESTROY:
      UnregisterHotKey(hWnd, CTRLC);
      UnregisterHotKey(hWnd, ALTF1);
      PostQuitMessage(0);
      DeleteObject ( hbrWhite );
      DeleteObject ( hbrGray );
      DeleteObject ( hbrBlack );
      DeleteObject ( hbrRed );
      DeleteObject ( hbrBlue );
      DeleteObject ( hbrYellow );
      break;
 
    case WM_CREATE:
     {
      SCROLLINFO si;
      TEXTMETRIC tm;
      /* Register a Ctrl+Alt+C hotkey*/
      RegisterHotKey(hWnd, CTRLC, MOD_CONTROL, VK_C);
      RegisterHotKey(hWnd, ALTF1, MOD_CONTROL | MOD_ALT, VK_F1);
 
      hbrWhite = CreateSolidBrush ( RGB(0xFF, 0xFF, 0xFF));
      hbrGray = CreateSolidBrush ( RGB(0xAF, 0xAF, 0xAF));
      hbrBlack = CreateSolidBrush ( RGB(0x00, 0x00, 0x00));
      hbrRed = CreateSolidBrush ( RGB(0xFF, 0x00, 0x00));
      hbrBlue = CreateSolidBrush ( RGB(0x00, 0x00, 0xFF));
      hbrYellow = CreateSolidBrush ( RGB(0xFF, 0xFF, 0x00));
 
      si.cbSize = sizeof(si);
      si.fMask = SIF_ALL;
          si.nMin = 0;
          si.nMax = 100;
          si.nPage = 5;
      si.nPos = 0;
 
      SetScrollInfo ( hWnd, SB_HORZ, &si, FALSE );
      SetScrollInfo ( hWnd, SB_VERT, &si, FALSE );
 
 
      /* The window is being created. Create our button
       * window now. */
 
      /* First we use the system fixed font size to choose
       * a nice button size. */
      hDC = GetDC (hWnd);
      SelectObject (hDC, GetStockObject (SYSTEM_FIXED_FONT));
      GetTextMetrics (hDC, &tm);
      cx = tm.tmAveCharWidth * 30;
      cy = (tm.tmHeight + tm.tmExternalLeading) * 2;
      ReleaseDC (hWnd, hDC);
 
      /* Now create the button */
      hwndButton = CreateWindow (
              "button",         /* Builtin button class */
              "Click Here",
              WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
              0, 0, cx, cy,
              hWnd,             /* Parent is this window. */
              (HMENU) 1,        /* Control ID: 1 */
              ((LPCREATESTRUCT) lParam)->hInstance,
              NULL
              );
 
      return 0;
          break;
     }
 
     case WM_PAINT:
      hDC = BeginPaint(hWnd, &ps);
      TextOut(hDC, 10, 10, "Hello World from ReactOS!",
            strlen("Hello World from ReactOS!"));
      TextOut(hDC, 10, 80, "Press Ctrl+C or Ctrl+Alt+F1 to test Hotkey support.",
            strlen("Press Ctrl+C or Ctrl+Alt+F1 to test Hotkey support."));
          GetClientRect(hWnd, &clr);
          GetWindowRect(hWnd, &wir);
          sprintf(spr, "%lu,%lu,%lu,%lu              ", clr.left, clr.top, clr.right, clr.bottom);
          sprintf(sir, "%lu,%lu,%lu,%lu              ", wir.left, wir.top, wir.right, wir.bottom);
          TextOut(hDC, 10, 30, spr, 20);
          TextOut(hDC, 10, 50, sir, 20);
 
      /* Draw "Hello, World" in the middle of the upper
       * half of the window. */
      rc.bottom = rc.bottom / 2;
      DrawText (hDC, "Hello, World", -1, &rc,
              DT_SINGLELINE | DT_CENTER | DT_VCENTER);
 
      EndPaint (hWnd, &ps);
      return 0;
      break;
 
         case WM_SIZE:
      /* The window size is changing. If the button exists
       * then place it in the center of the bottom half of
       * the window. */
      if (hwndButton &&
              (wParam == SIZEFULLSCREEN ||
               wParam == SIZENORMAL)
         )
      {
              rc.left = (LOWORD(lParam) - cx) / 2;
              rc.top = HIWORD(lParam) * 3 / 4 - cy / 2;
              MoveWindow (
                      hwndButton,
                      rc.left, rc.top, cx, cy, TRUE);
      }
      break;
 
         case WM_COMMAND:
      /* Check the control ID, notification code and
       * control handle to see if this is a button click
       * message from our child button. */
      if (LOWORD(wParam) == 1 &&
          HIWORD(wParam) == BN_CLICKED &&
          (HWND) lParam == hwndButton)
      {
              /* Our button was clicked. Close the window. */
              DestroyWindow (hWnd);
      }
      return 0;
      break;
 
    default:
      return DefWindowProc(hWnd, msg, wParam, lParam);
    }
    return 0;
}