convert pdf to tiff c# free : Add signature field to pdf Library application class asp.net html wpf ajax PyMOTW-1.13292-part1574

Python Module of the Week, Release 1.132
$ python EasyDialogs_AskString_too_long.py
len(default)= 520
len(response)= 254
27.1.4 Passwords
Use AskPassword to prompt the user forsecret values that should not be echoed back to the screen in clear-text.
import EasyDialogs
response = EasyDialogs.AskPassword(’Password:’, default=’s3cr3t’)
print ’Shh!:’, response
$ python EasyDialogs_AskPassword.py
Shh!: s3cr3t
The Ok/Cancel behavior forAskPassword is the same as AskString.
27.1.5 Files and Directories
There are special functions forrequesting file or directory names. These use the native file selectordialogs, so the user
does not have to type in the paths. For example,to ask the user which file to open,use AskFileForOpen.
27.1. EasyDialogs – Carbon dialogs for Mac OS X
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Python Module of the Week, Release 1.132
import EasyDialogs
import os
filename = EasyDialogs.AskFileForOpen(
message=’Select a a Python n source file’,
defaultLocation=os.getcwd(),
wanted=unicode,
)
print ’Selected:’, filename
The wanted=unicode argument tells AskFileForOpen to return the name of the file as a unicode string. The other
possible return types include ASCII string, and some Apple data structures forworking with file references.
By specifing defaultLocation, this example initializes the dialog to the current working directory. The user is still free
to navigate around the filesystem.
Other options to AskFileForOpen let you filter the values displayed, control the type codes of files visible to the user,
and interact with the dialog through callbacks. Refer to the module documentation and Apple’s reference guide for
more details.
$ python EasyDialogs_AskFileForOpen.py
Selected: /Users/dhellmann/Documents/PyMOTW/in_progress/EasyDialogs/EasyDialogs_AskFileForOpen.py
To prompt the user to provide a newfilename when saving a file,use AskFileForSave.
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Chapter 27. Miscelaneous
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Python Module of the Week, Release 1.132
import EasyDialogs
import os
filename = EasyDialogs.AskFileForSave(
message=’Name the e destination’,
defaultLocation=os.getcwd(),
wanted=unicode,
)
print ’Selected:’, filename
$ python EasyDialogs_AskFileForSave.py
Selected: /Users/dhellmann/Documents/PyMOTW/in_progress/EasyDialogs/new_file.py
If you need the user to select a directory, existing or new, use AskFolder. The dialog includes a button to let them
create a new folder.
import EasyDialogs
import os
filename = EasyDialogs.AskFolder(
message=’Name the e destination’,
defaultLocation=os.getcwd(),
wanted=unicode,
)
print ’Selected:’, filename
27.1. EasyDialogs – Carbon dialogs for Mac OS X
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Python Module of the Week, Release 1.132
$ python EasyDialogs_AskFolder.py
Selected: /Users/dhellmann/Documents/PyMOTW/in_progress/EasyDialogs
27.1.6 GetArgv
An unusually complex dialog, GetArgv lets the user build a command line string by selecting options from menus. It
uses a variation of the getopt syntax to describe the valid options, and returns a list of strings that can be parsed by
getopt. In my research this week, Ifound some scripts that use GetArgv if the user does not specify arguments on the
command line.
Let’s look at an example that builds a command using the options supported by the Python interpreter.
import EasyDialogs
arguments = EasyDialogs.GetArgv([
(’c=’’program passed in as string g (terminates option n list)’),
(’d’’Debug’),
(’E’’Ignore environment t variables’),
(’i’’Inspect interactively after running’),
(’m=’’run library module as s a a script (terminates option list)’),
(’O’’Optimize generated bytecode’),
(’Q=’’division options: -Qold (default), , -Qwarn, , -Qwarnall, -Qnew’),
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Chapter 27. Miscelaneous
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Python Module of the Week, Release 1.132
(’S’"don’t imply ’import t site’ on n initialization"),
(’t’’issue warnings s about inconsistent tab usage’),
(’tt’’issue errors s about inconsistent tab usage’),
(’u’’unbuffered binary stdout t and d stderr’),
(’v’’verbose (trace import statements)’),
(’V’’print the e Python n version n number and d exit’),
(’W=’’warning control
(arg is action:message:category:module:lineno)’),
(’x’’skip first t line e of source, allowing g use of f non-Unix x forms of f #!cmd’),
],
commandlist=[(’python’’Default Interpreter’),
(’python2.5’’Python 2.5’),
(’pyhton2.4’’Python 2.4’),
],
addoldfile=True,
addnewfile=False,
addfolder=False,
)
print arguments
27.1. EasyDialogs – Carbon dialogs for Mac OS X
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Python Module of the Week, Release 1.132
The first argument is a list of tuples containing the option specifierand a text description. The specifier can contain a
single letter for simple boolean switches; a letter followed by colon (”:”) orequals sign (“=”) for single letter options
that take an argument; several letters forlong-formswitches (“opt” translates to “–opt”); or several letters followed by
colon or equal sign for long options takingan argument. The option description is a string displayed in the dialog.
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Chapter 27. Miscelaneous
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Python Module of the Week, Release 1.132
The dialog is divided into 4 sections. At the top is the list of options you specified. The user can select an option
from the list. Ifthe option takes an argument, a text field is displayed so the user can provide a value. The Add button
inserts the selected option into the command line field at the bottom of the dialog.
27.1. EasyDialogs – Carbon dialogs for Mac OS X
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Python Module of the Week, Release 1.132
Thesecondargument to GetArgv is a list ofcommands and descriptions. Theusercanselecta commandtobeincluded
in the argument list fromthe menu in the middle ofthe dialog.
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Chapter 27. Miscelaneous
Python Module of the Week, Release 1.132
The arguments addoldfile, addnewfile, and addfolder control the sensitivity of the buttons in the third section of the
dialog. In this example, only the Add file... button is enabled because the Python interpreter does not take directories
ormissing files as arguments.
At the bottom ofthe dialog is the command line being constructed by the user. When they press OK, GetArgv returns
alist of all of the options that looks like sys.argv.
$ python EasyDialogs_GetArgv.py
[’python’, ’-d’, ’-v’, ’/Users/dhellmann/Documents/PyMOTW/in_progress/EasyDialogs/EasyDialogs_GetArgv.py’]
See also:
27.1. EasyDialogs – Carbon dialogs for Mac OS X
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Python Module of the Week, Release 1.132
EasyDialogs(http://docs.python.org/library/easydialogs.html) Thestandardlibrarydocumentationforthismod-
ule.
Navigation Services Reference(http://developer.apple.com/documentation/Carbon/Reference/Navigation_Services_Ref/Reference/reference.html)
Documentation forApple’s API forworking with file objects under Mac OS X.
EasyDialogs for Windows(http://www.averdevelopment.com/python/EasyDialogs.html) Aversionofthismod-
ule that runs under Windows.
optparse-gui(http://code.google.com/p/optparse-gui/) AreplacementforGetArgvthatworkswithoptparsein-
stead.
EasyGui(http://easygui.sourceforge.net/) Asimilarportablelibraryforcreatingsimplegraphicaluserinterfaces.
27.2 plistlib – Manipulate OS X property list files
Purpose Read and write OSX propertylist files
Available In 2.6
plistlibprovidesaninterfaceforworkingwithpropertylistfilesusedunderOSX.plistfilesaretypicallyXML,
sometimes compressed. They are used by the operating system and applications to store preferences or other config-
uration settings. The contents are usually structured as a dictionary containing key value pairs of basic built-in types
(unicode strings, integers, dates, etc.). Values can also be nested data structures such as other dictionaries or lists.
Binarydata,or strings with control characters, can be encoded using the data type.
27.2.1 Reading plist Files
OS X applications such as iCal use plist files to store meta-data about objects they manage. For example, iCal stores
the definitions ofall ofyour calendars as a series of plist files in the Library directory.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>AlarmFilter</key>
<true/>
<key>AlarmsDisabled</key>
<false/>
<key>AttachmentFilter</key>
<true/>
<key>AutoRefresh</key>
<true/>
<key>Checked</key>
<integer>1</integer>
<key>Color</key>
<string>#808000FF</string>
<key>Enabled</key>
<true/>
<key>Key</key>
<string>4221BCE5-1017-4EE4-B7FF-311A846C600D</string>
<key>NeedsForcedUpdate</key>
<false/>
<key>NeedsRefresh</key>
<true/>
<key>Order</key>
<integer>25</integer>
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Chapter 27. Miscelaneous
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