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    <p><b>The trick is to use 'P' as a format specifier for all pointer arguments</b>. You'll have to provide a string as the pointed-to area.</p> <p>Of course you'll have to make sure these strings have the correct expected size otherwise bad things will happen.</p> <p>You can directly create these strings</p> <pre><code># Mostly useful when the area will be totally overwritten pointed_to_area = "\0" * n </code></pre> <p>or use the more civilized <code>Array#pack</code></p> <pre><code># Allows you to control how ruby values get encoded in the buffer pointed_to_area = [1, 2, 3, 4].pack('SsLI') </code></pre> <p>Hope this helps. <hr> The following works on my XP box with an old ruby 1.8.2:</p> <pre><code>require 'Win32API' module Win32 # This method is only here for test purposes # Be careful to use the ascii version FindWindow = Win32API.new('user32', 'FindWindowA', ['P', 'P'], 'L') def self.findWindow(lpClassName, lpWindowName) h = FindWindow.call(lpClassName, lpWindowName) raise "FindWindow failed" if h == 0 h end # From winddef.h RECT = Struct.new(:left, :top, :right, :bottom) RECT.class_eval do def pack [left, top, right, bottom].pack('l4') end def self.unpack(s) new(*s.unpack('l4')) end end # From shellapi.h APPBARDATA = Struct.new(:cbSize, :hWnd, :uCallbackMessage, :uEdge, :rc, :lParam) APPBARDATA.class_eval do def pack unless rc.is_a? RECT raise ArgumentError, ":rc must be an instance of Win32::RECT, got #{rc.inspect}" end # DWORD + HWND + UINT + UINT + RECT + LPARAM cbSize = 4 + 4 + 4 + 4 + 16 + 4 [cbSize, hWnd, uCallbackMessage, uEdge, rc.pack, lParam].pack('L2I2a16L') end def self.unpack(s) tmp = self.new(*s.unpack('L2I2a16L')) tmp.rc = RECT.unpack(tmp.rc) tmp end end SHAppBarMessage = Win32API.new('shell32', 'SHAppBarMessage', ['L', 'P'], 'L') # Calls SHAppBarMessage and returns the altered APPBARDATA def self.shAppBarMessage(dwMessage, appBarData) s = appBarData.pack ok = (SHAppBarMessage.call(dwMessage, s) != 0) raise "SHAppBarMessage failed" unless ok APPBARDATA.unpack(s) end ABM_NEW = 0x00000000 ABM_REMOVE = 0x00000001 ABM_QUERYPOS = 0x00000002 ABM_SETPOS = 0x00000003 ABM_GETSTATE = 0x00000004 ABM_GETTASKBARPOS = 0x00000005 ABM_ACTIVATE = 0x00000006 ABM_GETAUTOHIDEBAR = 0x00000007 ABM_SETAUTOHIDEBAR = 0x00000008 ABM_WINDOWPOSCHANGED = 0x00000009 ABM_SETSTATE = 0x0000000a ABE_LEFT = 0 ABE_TOP = 1 ABE_RIGHT = 2 ABE_BOTTOM = 3 end if __FILE__ == $0 require 'test/unit' class SHAppBarMessageTest &lt; Test::Unit::TestCase include Win32 def test_pack_unpack a = APPBARDATA.new(-1, 0, 0, ABE_TOP, RECT.new(1, 2, 3, 4), 0) b = APPBARDATA.unpack(a.pack) a.cbSize = b.cbSize assert_equal(a.values, b.values) end def test_simple_pos_query h = Win32.findWindow("Shell_TrayWnd", nil) a = APPBARDATA.new(-1, 0, 0, ABE_TOP, RECT.new(0, 0, 0, 0), 0) result = Win32.shAppBarMessage(ABM_GETTASKBARPOS, a) assert(result.rc.left &lt; result.rc.right) assert(result.rc.top &lt; result.rc.bottom) puts result.rc.inspect end end end </code></pre>
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