vb.net qr code scanner AUTOMATING UNIX APPLICATIONS in Objective-C

Draw QR Code JIS X 0510 in Objective-C AUTOMATING UNIX APPLICATIONS

CHAPTER 29 AUTOMATING UNIX APPLICATIONS
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Mac OS X ships with several popular general-purpose scripting languages installed as standard: Perl, Python, Ruby, and Tcl. Because this is a book about AppleScript, I don t want to spend lots of time teaching you how to use those languages as well, but scripters who already know a little about using these languages (or are willing to learn) can easily call them from AppleScript via the do shell script command. You ll now look at a couple of quick examples using Python (www.python.org), a popular general-purpose scripting language with a clean syntax and plenty of useful libraries included as standard.
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The following script uses Python s urllib module to convert an AppleScript string for use in URLs: on encode_URL(txt) set python_script to "import sys, urllib; print urllib.quote(sys.argv[1])" set python_script to "python -c " & quoted form of python_script & " " & quoted form of txt return do shell script python_script end encode_URL encode_URL("photos ") --> "photos%20%C6%92" In a URL, only numbers, characters a to z and A to Z, and a few symbols (such as - and _) are left intouched. Everything else should be converted to the UTF-8 equivalent and then formatted as hex numbers with a % symbol in front of each one. As you ll recall, do shell script already converts text to UTF-8 when passing it to the Unix shell, and UTF-8 is just what the quote function in Python s urllib module wants, so you can pass it to that without any extra conversions. Similarly, the quote function returns ASCII text, so you don t need any extra conversion there either. In the Python script, the import statement imports the libraries you need. The sys.argv[1] bit gets the text to convert; this is supplied as an extra argument to the python shell command, which passes it to the script. The quote function converts this to the desired format, and the result is printed to standard out. In the previous example, the command executed by the Unix shell will look like this: python -c 'import sys, urllib; print urllib.quote(sys.argv[1])' 'photos ' The -c option is followed by the script you want Python to execute. This is followed by the argument you want it to pass directly to the script for processing. Remember that although the actual string-to-URL conversion is fast, calling this subroutine repeatedly will be relatively slow because of the time it takes to start a new Unix shell followed by a new python interpreter. If you want to convert lots of strings at once, you could speed things up by concatenating them into a return-delimited string, passing that to the encode_url subroutine in a single call and then splitting the result into a list (remember that returns will be converted to %13, so you ll need to use text item delimiters, not every paragraph of . . ., to split it back up).
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CHAPTER 29 AUTOMATING UNIX APPLICATIONS
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The following script is quite similar to the previous one, except this time you re using Python to convert a string to uppercase. Here s the subroutine, followed by an example of its use: on uppercase_text(txt) set python_script to "import sys; print unicode(sys.argv[1], 'utf8').upper().encode('utf8')" return do shell script "python -c " & quoted form of python_script & " " & quoted form of txt end uppercase_text uppercase_text("Mon r sum est excellent!") --> "MON R SUM EST EXCELLENT!" Since you ll want any non-ASCII characters to be converted correctly, you ll use Python s Unicode support. You do this by asking Python to convert the UTF-8 data it receives into a unicode object (equivalent to AppleScript s Unicode text, only more powerful), change the case of that, and then convert the result into UTF-8 data. As you can see from the example result, non-ASCII characters, in this case the two characters, are correctly converted. You can easily adapt this code to take advantage of other basic text manipulation features built into every unicode object in Python. For example, to change the text to lowercase, sentence case, or title case instead, replace the upper() call with lower(), capitalize(), or title(). If the input text is large, you ll want to pass it via stdin instead of argv, in which case you d need to use the temp file based technique described earlier in the chapter and change the Python script to this: "import sys; print unicode(sys.stdin.read(), 'utf8').upper().encode('utf8')"
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