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  • [iPhone app] Detecting which key has been pressed in UITextField

    - by Dough
    Hi, I have an UITextField object in my view and want to launch a method when user press backspace button and textField is empty. First I have to do is to create a cursor storing text length, so when cursor changes from 1 to 0 there is nothing to do. The only way to launch the method is when text length is 0 - press backspace - remain to 0. How to catch the event of pressing the backspace key in my UITextField ? Thanks in advance !

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  • RSA key length and export limitations

    - by Alex Stamper
    I know, there are a lot of limitations to the length of used key (import and export limitations for nearly each country). Usually, it varies from 64 to 256 bits. To use more bits, it is obligatory to ask permission from authorities. But it is recommended to use 1024 bits keys for RSA as minimum! Does it mean that I cannot just use RSA without any problems with law and so on?

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  • PostgreSQL, triggers, and concurrency to enforce a temporal key

    - by Hobbes
    I want to define a trigger in PostgreSQL to check that the inserted row, on a generic table, has the the property: "no other row exists with the same key in the same valid time" (the keys are sequenced keys). In fact, I has already implemented it. But since the trigger has to scan the entire table, now i'm wondering: is there a need for a table-level lock? Or this is managed someway by the PostgreSQL itself?

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  • Wait For Return Key Press Using Java Scanner

    - by Gordon
    What would be the best way to wait for a return key press from the user using the Java Scanner Class? In a command line tool I would like the user to confirm before carrying out an action. Please correct me if there a more standard way of doing this in a command line tool.

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  • Java - get index of key in HashMap?

    - by llm
    In java if I am looping over the keySet() of a HashMap, how do I (inside the loop), get the numerical index of that key? Basically, as I loop through the map, I want to be able to get 0,1,2...I figure this would be cleaner than declaring an int and incrementing with each iteration. Thanks.

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  • Detect if a key is bound to something in vim

    - by WishCow
    I'd like to know if there is a way to figure out if a key does something in vim. I know that I can use :map to see user-defined mappings, but is there something for the built-in stuff? For example, I always had CTRL-W bound to close tab, because I thought that it was unused. After half a year, I found out that there are some sequences that use it, like CTRL-W CTRL-S to split the window, and it was a nightmare to retrain myself.

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  • Android change background of key dynamically

    - by Wouter
    I'm building a custom keyboard in android. My input.xml: <com.mykeyboard.MyKeyboardView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/keyboard" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:keyBackground="@drawable/keybg" /> All the keys do have the same background. Now I'm trying to dynamically change the background of one single key. Is this possible?

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  • can I have an abstract base class with the key attribute being generic

    - by Greg
    Hi, I want to create a re-usable library. I was going to use extension methods however I run into some issues in some cases for the client to have to specify in the calling method the types. QUESTION - If I use an abstract base class as the basis, can I specify an attribute/property in the class to be generic (e.g. the key property might be an 'int' in one case, or a 'string' in another)?

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  • get dictionary key by value

    - by loviji
    how to get a Dictionary key by value in C#? Dictionary<string, string> types = new Dictionary<string, string>() { {"1", "one"}, {"2", "two"}, {"3", "three"} }; I want simething like this: getByValueKey(string value); getByValueKey("one") must be return "1". What is the best way do this? may be HashTable, SortedLists?

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  • Python: if key in dict vs. try/except

    - by LeeMobile
    I have a question about idioms and readability, and there seems to be a clash of Python philosophies for this particular case: I want to build dictionary A from dictionary B. If a specific key does not exist in B, then do nothing and continue on. Which way is better? try: A["blah"] = B["blah"] except KeyError: pass or if "blah" in B: A["blah"] = B["blah"] "Do and ask for forgiveness" vs. "simplicity and explicitness". Which is better and why?

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  • perl - getting a value from a map where the key has a dot

    - by imerez
    I have a map in perl which has been dumped into from some legacy code the name of the key has now changed from simply reqHdrs to reqHdrs.bla $rec->{reqHdrs.bla} My problem is now I cant seem to access this field from the map any ideas ? The following is my error Download Script Output: Bareword "reqHdrs" not allowed while "strict subs" in use

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  • [jquery] e.which code for escape key

    - by Shishant
    I have two functions. When enter is pressed the functions runs correctly but when escape is pressed it doesn't. What's the correct number for the escape key? $(document).keypress(function(e) { if (e.which == 13) { $('.save').click(); } // enter (works as expected) if (e.which == 27) { $('.cancel').click(); } // esc (does not work) });

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