Created
January 12, 2011 21:46
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GUID
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class GUID < FFI::Struct | |
layout :data1, :int32, | |
:data2, :int16, | |
:data3, :int16, | |
:data4_0, :int8, | |
:data4_1, :int8, | |
:data4_2, :int8, | |
:data4_3, :int8, | |
:data4_4, :int8, | |
:data4_5, :int8, | |
:data4_6, :int8, | |
:data4_7, :int8, | |
end | |
class IAccessible < FFI::Struct | |
layout :lpVtbl, :pointer | |
end | |
class IAccessibleVtbl < FFI::Struct | |
layout :QueryInterface, :pointer, | |
:AddRef, :pointer, | |
:Release, :pointer, | |
:GetTypeInfoCount, :pointer, | |
:GetTypeInfo, :pointer, | |
:GetIDsOfNames, :pointer, | |
:Invoke, :pointer, | |
:get_accParent, :pointer, | |
:get_accChildCount, :pointer, | |
:get_accChild, :pointer, | |
:get_accName, :pointer, | |
:get_accValue, :pointer, | |
:get_accDescription, :pointer, | |
:get_accRole, :pointer, | |
:get_accState, :pointer, | |
:get_accHelp, :pointer, | |
:get_accHelpTopic, :pointer, | |
:get_accKeyboardShortcut, :pointer, | |
:get_accFocus, :pointer, | |
:get_accSelection, :pointer, | |
:get_accDefaultAction, :pointer, | |
:accSelect, :pointer, | |
:accLocation, :pointer, | |
:accNavigate, :pointer, | |
:accHitTest, :pointer, | |
:accDoDefaultAction, :pointer, | |
:put_accName, :pointer, | |
:put_accValue, :pointer | |
end | |
class Variant < FFI::Struct | |
layout :vt, :long, | |
:wReserved1, :uint, | |
:wReserved2, :uint, | |
:wReserved3, :uint, | |
:lVal, :long | |
end | |
S_OK = 0 | |
E_INVALIDARG = 0x80070057 | |
E_NOINTERFACE = 0x80004002 | |
def state_of_accessible_button(hwnd) | |
co_initialize nil | |
module_handle = load_library "oleacc.dll" | |
if (module_handle != 0) | |
address_accessible_object_from_window = get_proc_address(module_handle, "AccessibleObjectFromWindow") | |
guid = GUID.new | |
guid[:data1] = 0x618736e0 | |
guid[:data2] = 0x3c3d | |
guid[:data3] = 0x11cf | |
guid[:data4_0] = 0x81 | |
guid[:data4_1] = 0x0c | |
guid[:data4_2] = 0x00 | |
guid[:data4_3] = 0xaa | |
guid[:data4_4] = 0x00 | |
guid[:data4_5] = 0x38 | |
guid[:data4_6] = 0x9b | |
guid[:data4_7] = 0x71 | |
i_accessible_ptr = FFI::MemoryPointer.new(:pointer) | |
accessible_object_from_window = FFI::Function.new(:uint32, [:long, :uint32, :pointer, :pointer ], address_accessible_object_from_window) | |
hResult = accessible_object_from_window.call(hwnd, 0xFFFFFFFC, guid, i_accessible_ptr) # for OBJID_CLIENT | |
if (hResult == S_OK) | |
i_accessible = IAccessible.new(i_accessible_ptr.read_pointer) | |
i_accessible_vtbl = IAccessibleVtbl.new(i_accessible[:lpVtbl]) | |
get_accState = FFI::Function.new(:uint32, [:pointer, :pointer, :pointer], i_accessible_vtbl[:get_accState]) | |
variant_in = Variant.new | |
variant_in[:vt] = 3 | |
variant_in[:lVal] = 0 # CHILDID_SELF | |
variant_out = Variant.new | |
result = get_accState.call(i_accessible, variant_in, variant_out) # segfault | |
puts "result" + result.to_s | |
puts "variant_out" + variant_out[:lVal] | |
end | |
if (hResult == E_INVALIDARG) | |
puts "E_INVALIDARG" | |
end | |
if (hResult == E_NOINTERFACE) | |
puts "E_NOINTERFACE" | |
end | |
puts "hResult = 0x" + hResult.to_s(16) | |
end | |
co_uninitialize | |
end |
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