From: Michael Davis <mdavis@...>
Date: 2003-07-28T14:03:46+09:00
Subject: Calling Win32API on XP with cygwin is failing

Hello again,

Has anyone experienced any issues with accessing Win32API using cygwin on XP.  Simple calls to Win32API functions are all failing.  I am running the latest cygwin on XP.  The gcc compiler is gcc version 3.3, and Ruby 1.6.8 (compiled from source).  On another similar note, Ruby 1.6.5 and 1.6.7 fail to compile with the following compile errors:
   gcc -I. -g -O2 -I. -I. -I/usr/local/include -c ./missing/strftime.c
   missing/strftime.c: In function `strftime':
   missing/strftime.c:450: error: too many arguments to function `timezone'
  make: *** [strftime.o] Error 1

Ruby 1.6.8 compiled after I removed several extensions such as gdb because they were failing to compile.  Win32API compilied successfully.

Here is the Ruby snippet I am trying to run (CreateWindow fails on XP, works on 2000, it should create a little see through window for 6 seconds):

require 'Win32API'             # this uses the Win32API for calling functions in windows DLLs.

   CreateWindow      = Win32API.new('user32',  'CreateWindowEx', ['L', 'p', 'p', 'l', 'L', 'L', 'L', 'L', 'L', 'L', 'L', 'p'], 'L')
   DestroyWindow     = Win32API.new('user32',  'DestroyWindow', ['L'], 'L')
   PostQuitMessage   = Win32API.new('user32',  'PostQuitMessage', ['L'], 'L')
   ShowWindow        = Win32API.new('user32',  'ShowWindow', ['L', 'L'], 'L')
   Sleep             = Win32API.new('kernel32',  'Sleep', ['L'], 'L')
   GetError          = Win32API.new('kernel32','GetLastError', [], 'L')

   WM_CLOSE          = 0x0010
   WM_PAINT          = 0x000F

   # Window Styles
   WS_OVERLAPPED     = 0x00000000
   WS_POPUP          = 0x80000000
   WS_CHILD          = 0x40000000
   WS_MINIMIZE       = 0x20000000
   WS_VISIBLE        = 0x10000000
   WS_DISABLED       = 0x08000000
   WS_CLIPSIBLINGS   = 0x04000000
   WS_CLIPCHILDREN   = 0x02000000
   WS_MAXIMIZE       = 0x01000000
   WS_CAPTION        = 0x00C00000  #     /* WS_BORDER | WS_DLGFRAME  */
   WS_GROUP          = 0x00020000
   WS_SYSMENU        = 0x00080000
   WS_THICKFRAME     = 0x00040000
   WS_MINIMIZEBOX    = 0x00020000
   WS_MAXIMIZEBOX    = 0x00010000
   WS_BORDER         = 0x00800000

   WS_OVERLAPPEDWINDOW = (WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX)
   WS_POPUPWINDOW      = (WS_POPUP | WS_BORDER | WS_SYSMENU)
   WS_CHILDWINDOW      = (WS_CHILD)

   # Extended Window Styles
   WS_EX_TOPMOST          = 0x00000008
   WS_EX_TRANSPARENT      = 0x00000020
   WS_EX_TOOLWINDOW       = 0x00000080
   WS_EX_WINDOWEDGE       = 0x00000100
   WS_EX_CLIENTEDGE       = 0x00000200

   WS_EX_OVERLAPPEDWINDOW =(WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE)

   def create_window(title, x, y, w, h)
      window_id = 0
      if (title)
         type = WS_EX_OVERLAPPEDWINDOW
         attr = (WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS | WS_MINIMIZE)
         window_id = CreateWindow.call(type, 'static', title.to_s, attr, x, y, w, h, 0, 0, 0, 0)
      end
      raise "create_window(#{title.inspect}, #{x}, #{y}, #{w}, #{h}) - failed: #{GetError.call()}" if (!window_id || window_id == 0)
      #hide_window(window_id)
      #SetWindowLong.call(window_id, GWL_USERDATA, ('Win32API_MessageHandler_window'.intern.to_i))
      return window_id
   end

window_id = create_window('Test', 20, 20, 400, 200)
ShowWindow.call(window_id, 1)  #SW_NORMAL = 1, SW_SHOW = 5
Sleep.call(6000)
SendMessage.Call(window_id, WM_CLOSE, 0, 0)