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34 lines
1.3 KiB
Text
34 lines
1.3 KiB
Text
Ruby/Tk does NOT support forking the process on which Tk interpreter
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is running (unless NEVER control Tk interpreter under the forked child
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process). In the library 'tk.rb', a Tk interpreter is initialized.
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Therefore, if you want running Tk under a child process, please call
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"require 'tk'" in the child process.
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# If do fork and exec(<new Ruby/Tk>) on the child process, you can
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# control Ruby/Tk interpreter on the child process by 'send' command
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# of Tcl/Tk. About this, please see Tk.appsend and Tk.rb_appsend, or
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# 'remote-tk.rb' and the sample 'sample/remote-ip_sample.rb'.
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For example, the following sample1 will NOT work, and sample2 will
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work properly.
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---<sample1: NOT work>---------------------------------------
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require 'tk' ## init Tk interpreter under parent process
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exit! if fork ## exit parent process
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## child process
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TkButton.new(:text=>'QUIT', :command=>proc{exit}).pack
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Tk.mainloop
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-------------------------------------------------------------
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---<sample2: will work>--------------------------------------
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exit! if fork ## exit main process
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## child process
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require 'tk' ## init Tk interpreter under child process
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TkButton.new(:text=>'QUIT', :command=>proc{exit}).pack
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Tk.mainloop
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-------------------------------------------------------------
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2004/05/22 Hidetoshi NAGAI
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