Class: NPGRT::Win32API::API

Inherits:
Object
  • Object
show all
Defined in:
lib/npgrt/win32api.rb

Instance Method Summary collapse

Constructor Details

#initialize(dll, func, param = nil, ret = "L") ⇒ API

Returns a new instance of API.



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# File 'lib/npgrt/win32api.rb', line 7

def initialize(dll, func, param = nil, ret = "L")
  @dll, @func, @param, @ret = dll, func, param, ret  
end

Instance Method Details

#call(*args) ⇒ Object 



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# File 'lib/npgrt/win32api.rb', line 27

def call(*args)
  param = @param || guess(args)
  @api ||= findapi(@dll, @func, param, @ret)
  @api.call(*args)
end

#findapi(dll, func, param, ret) ⇒ Object

Raises:

  • (Errno::ENOENT) 


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# File 'lib/npgrt/win32api.rb', line 11

def findapi(dll, func, param, ret)
  [dll, File.basename(dll) + "_" + NPGRT::PlatformWidth.to_s + File.extname(dll)].each{|d|
    [func, func + "A", func + "W"].each{|f|
      if (a = begin 
             W.new(d, f, param, ret)
           rescue LoadError, RuntimeError
        nil
           end 
         )
        return a
      end
    }
  }
  raise Errno::ENOENT, " NPGRT::API: Can't find a proper DLL for #{dll}!#{func}"
end

#guess(args) ⇒ Object 



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# File 'lib/npgrt/win32api.rb', line 37

def guess(args)
  args.map{|x| Integer === x ? "L" : "p"}
end

#inspect ⇒ Object 



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# File 'lib/npgrt/win32api.rb', line 33

def inspect
  "#<API #{@dll}!#{@func} takes #{@param || '<auto>'} returns #{@ret}>"
end