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Calculate MD5 checksum for a file

I'm using iTextSharp to read the text from a PDF file. However, there are times I cannot extract text, because the PDF file is only containing images. I download the same PDF files everyday, and I want to see if the PDF has been modified. If the text and modification date cannot be obtained, is a ...
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What are forward declarations in C++?

At: http://www.learncpp.com/cpp-tutorial/19-header-files/ 8 Answers 8 ...
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Django: How to manage development and production settings?

... The DJANGO_SETTINGS_MODULE environment variable controls which settings file Django will load. You therefore create separate configuration files for your respective environments (note that they can of course both import * from a separate, "shared settings" file), and use DJANGO_SETTINGS_MODULE ...
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How to prevent buttons from submitting forms

...citly: <button type="button">Button</button> in order to override the default submit type. I just want to point out the reason why this happens. share | improve this answer | ...
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Aliases in Windows command prompt

...the alias(es) persistent with the following steps, Create a .bat or .cmd file with your DOSKEY commands. Run regedit and go to HKEY_CURRENT_USER\Software\Microsoft\Command Processor Add String Value entry with the name AutoRun and the full path of your .bat/.cmd file. For example, %USERPROFILE%\...
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Dump a NumPy array into a csv file

Is there a way to dump a NumPy array into a CSV file? I have a 2D NumPy array and need to dump it in human-readable format. ...
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Basic http file downloading and saving to disk in python?

... A clean way to download a file is: import urllib testfile = urllib.URLopener() testfile.retrieve("http://randomsite.com/file.gz", "file.gz") This downloads a file from a website and names it file.gz. This is one of my favorite solutions, from Down...
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How to load JAR files dynamically at Runtime?

...you want to have any kind of module system you need to be able to load JAR files dynamically. I'm told there's a way of doing it by writing your own ClassLoader , but that's a lot of work for something that should (in my mind at least) be as easy as calling a method with a JAR file as its argument....
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Set select option 'selected', by value

...an easier way that doesn't require you to go into the options tag: $("div.id_100 select").val("val2"); Check out the this jQuery method. share | improve this answer | foll...
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What should Xcode 6 gitignore file include?

...v3 !default.perspectivev3 *.xcworkspace !default.xcworkspace xcuserdata profile *.moved-aside DerivedData .idea/ # Pods - for those of you who use CocoaPods Pods which I believe is the same .gitignore that GitHub sets up with all their repositories by default. 2) Another answer is that there's a...