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40 lines
1.3 KiB
Ruby
40 lines
1.3 KiB
Ruby
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#!/usr/bin/env ruby
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require "tk"
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TkMessage.new(:width=>360, :text=><<EOM).pack
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This sample shows how to use a binary sequence between Ruby and Tk. \
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This reads the image data from the file as the binary sequence.
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To treat the difference of encodings between on Ruby and on Tk seamlessly, \
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Ruby/Tk converts the encoding of string arguments automatically. \
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I think it is comfortable for users on almost all situations. \
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However, when treats a binary sequence, the convert process makes troubles.
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Tk::BinaryString class (subclass of Tk::EncodedString class) is the class \
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to avoid such troubles. Please see the source code of this sample. \
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A Tk::BinaryString instance is used to create the image for the center button.
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EOM
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ImgFile=['images','tcllogo.gif'].join(File::Separator)
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ph1 = TkPhotoImage.new(:file=>ImgFile)
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p ph1.configinfo
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b_str = Tk::BinaryString(IO.read(ImgFile))
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p [b_str, b_str.encoding]
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ph2 = TkPhotoImage.new(:data=>b_str)
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p ph2.configinfo
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p ph2.data(:grayscale=>true)
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ph3 = TkPhotoImage.new()
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ph3.put(ph2.data(:grayscale=>true))
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f = TkFrame.new.pack
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TkButton.new(:parent=>f, :image=>ph1, :command=>proc{exit}).pack(:side=>:left)
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TkButton.new(:parent=>f, :image=>ph2, :command=>proc{exit}).pack(:side=>:left)
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TkButton.new(:parent=>f, :image=>ph3, :command=>proc{exit}).pack(:side=>:left)
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Tk.mainloop
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