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1 #//////////////////////////////////////////////////////////////////////
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2 #
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3 # win32msgbox.rb
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4 # Copyright 2007-2015 Tassilo Philipp
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5 #
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6 # Dyncall sample loading user32.dll on windows, listing all user32
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7 # symbols and displaying a # native windows message box by calling
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8 # MessageBoxA(...).
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9 #
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10 #///////////////////////////////////////////////////////////////////////
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11
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12 require 'rbdc'
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13
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14 l = Dyncall::ExtLib.new
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15 if l.load('user32') != nil and l.syms_init('user32')
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16 l.syms_each { |s| puts s }
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17 puts l.syms_count
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18 puts l.exists?(:NonExistant)
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19 puts l.exists?(:MessageBoxA)
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20 puts l.call(:MessageBoxA, 'IZZI)i', 0, 'Hello world from dyncall!', 'dyncall demo', 0)
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21 # @@@ check puts on dyncall called function returning a void... crashes e.g. change above signature to IZZI)v
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22 end
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