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• C preprocessor: using #if inside #define?

  - by Wxy

  I want to write a macro that spits out code based on the boolean value of its parameter. So say DEF_CONST(true) should be expanded into "const", and DEF_CONST(false) should be expanded into nothing. Clearly the following doesn't work because we can't use another preprocessor inside #defines: #define DEF_CONST(b_const) \ #if (b_const) \ const \ #endif Any idea about how to do it?

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• How to load jni from sd card on android 2.1?

  - by user263423

  I want to load third-party jni library in runtime. I've tried to load directly from sdcard. It expectedly failed. I've tried to copy library from sdcard to /data/data/app/ and then System.load(/data/data/libjni.so) It works on HTC HERO, but fails on HTC Legend with Android 2.1. it fails during execution of native code and write to log uninformative stack trace Any other way to do it?

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• foo and _foo - about variables inside a class

  - by kame

  class ClassName(object): """ """ def __init__(self, foo, bar): """ """ self.foo = foo # read-write property self.bar = bar # simple attribute def _set_foo(self, value): self._foo = value def _get_foo(self): return self._foo foo = property(_get_foo, _set_foo) a = ClassName(1,2) #a._set_foo(3) print a._get_foo() When I print a._get_foo() the function _get_foo prints the variable self._foo . But where does it come from? self._foo and self.foo are different, aren't they?

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• Remove leading zero's from alphanumeic text

  - by cedar715

  I've seen questions to prefix zeros here in SO. But not the other way !! Can you guys suggest me how to remove the leading zeros in alphanumeric text. Are there any built-in APIs or do I need to write a method to trim the leading zero's? Example: 01234 converts to 1234 0001234a converts to 1234a 001234-a converts to 1234-a 101234 remains as 101234 2509398 remains as 2509398 123z remains as 123z 000002829839 converts to 2829839

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• Attach labels to items in TFS from the PowerBuilder IDE?

  - by DaveE

  We do this using the 'Advanced' button on the checkin dialog now (with Merant, nee PVCS) but the 'Advanced' button is disabled when I set TFS as my SCC provider. Is there a switch we can flip on either side to enable this? Or do we need to write some custom extension? Or can I get the TFS changeset number to associate with the change in PB? Or am I coming at doing selective builds entirely the wrong way?

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• F# and ASP.NET

  - by pistacchio

  Hi, is it possible to write ASP.NET (MVC) applications with F# code? If yes, how? What possible benefits would this provide? Thanks.

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• Simulating interaction between two users in Jmeter

  - by Victoria

  I have to register two users and simulate interaction between them (for example, a conversation). I can do the following: register the first user, then register the second, sign in using first user's data, write message to the second user and sign out. Then sign in using the second user's data, answer to the message and sign out. Is it possible to implement users' conversation without signing out if the system requires enabled cookies for users?

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• How to pick random (small) data samples using Map/Reduce?

  - by Andrei Savu

  I want to write a map/reduce job to select a number of random samples from a large dataset based on a row level condition. I want to minimize the number of intermediate keys. Pseudocode: for each row if row matches condition put the row.id in the bucket if the bucket is not already large enough Have you done something like this? Is there any well known algorithm? A sample containing sequential rows is also good enough. Thanks.

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• Creating an Expando object in Ruby

  - by tyndall

  Is there a better way to write this Expando class? The way it is written does not work. I'm using Ruby 1.8.7 starting code quoted from https://gist.github.com/300462/3fdf51800768f2c7089a53726384350c890bc7c3 class Expando def method_missing(method_id, *arguments) if match = method_id.id2name.match(/(\w*)(\s*)(=)(\s*)(\.*)/) puts match[1].to_sym # think this was supposed to be commented self.class.class_eval{ attr_accessor match[1].to_sym } instance_variable_set("#{match[1]}", match[5]) else super.method_missing(method_id, *arguments) end end end person = Expando.new person.name = "Michael" person.surname = "Erasmus" person.age = 29

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• Using visual studio 6 c++ compiler from within emacs

  - by jörg

  Hey guys, I'm just getting started with c++ development and I would like to use emacs to write the code and then compile and run it from within emacs using the visual studio 6 compiler. I have already googled around a bit but just can't seem to find an explanation of how this is done. Any pointers? Thanks for your help, joerg

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• Can multiple threads modify a dictionary?

  - by Sir Psycho

  In C#, can multiple threads read and write to a Dictionary provided each thread only accesses one element in the dictionary and never accesses another?

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• Create thumbnail and reduce image size

  - by oo

  I have very large images (jpg) and i want to write a csharp program to loop through the files and reduce the size of each image by 75%. I tried this: Image thumbNail = image.GetThumbnailImage(800, 600, null, new IntPtr()); but the file size is still very large. Is there anyway to create thumbnails and have the filesize be much smaller?

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• for line in open(filename)

  - by foosion

  I frequently see python code similar to for line in open(filename): do_something(line) When does filename get closed with this code? Would it be better to write with open(filename) as f: for line in f.readlines(): do_something(line)

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• rand (0,9) in php?

  - by aamir Fayyaz

  i am using rand function, but a problem is, when new value print old valu not remove, means new value over write on old value?

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• Is there any program that helps you check PHP codes?

  - by user300371

  Just a curious question but is there any programs that can help/aid you when you write PHP codes? Say there is an error in your code and using this program it would help you locate it, etc. I might be thinking too much...

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• How do I redirect to another page with ASP.NET?

  - by Sanctus2099

  I know it's a simple question but I really can't find anything on Google. Sorry if I'm not searching right. I created 2 pages and in the first one I have a button. What should I write in the C# code to change to redirect me on the second page? I usually know my way around C# but I'm totally new in ASP.

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• How to give color to your code?

  - by kame

  I have a black color code in Open Office write and want colorize it. How can I do this?

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• MySQL: Question about SELECT WHERE AND/OR

  - by Andrew

  I'm trying to write a query that returns the same result from three different events, but I think I am doing it wrong. I can run my query against one event ID and it works. How can I select all three? Here's what I have so far: SELECT * FROM `Registrations` WHERE `Role` = "Attendee" AND `RegistrationStatus_ID` = "1" AND `DigSignature` IS NULL AND `Event_ID` = "147" OR `Event_ID` = "155" OR `Event_ID` = "160"

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• Passing function-specific variables

  - by Simon Carlson

  Say I got two functions that looks like this: function main(Index) { doStuff(); } function doStuff() { if(Index == 1) { document.write("Hello world!") } } And some HTML: <input type="button" value="Click me" onclick="main(1)" /> I realize this is a very stupid way to use function-specific variables and such, but it's just out of curiosity. So is it possible to pass the variable Index from the main function to the doStuff function?

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• localhost problem internet explorer

  - by Alvi

  Hello everyone I have installed xampp 1.7.3. After starting apache and mysql service when I write http://localhost/ in the internet explorer address bar it shows 'The page cannot be displayed'. But for Firefox it creates no problem and shows Xampp index.php page. Now how can I solve this problem? Thanks in advance

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• XMLEncoder in java for serialization

  - by tom

  Im just wondering how i use xmlencoder to serialize ArrayList where foo is my own made class. Do i have to do anything in particular, ie define my own xml structure first and then call toString on each value in my list and write it out? Can anyone point me to a good tutorial? http://java.sun.com/products/jfc/tsc/articles/persistence4/ Thats what i have been looking at but it doesnt seem to mention what to do with non library classes. Thanks

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• PHP use function return value as array

  - by Richard Knop

  Why is it that this works: $cacheMatchesNotPlayed = $cache->load('externalData'); $cacheMatchesNotPlayed = $cacheMatchesNotPlayed['matchesNotPlayed']; But this doesn't work: $cacheMatchesNotPlayed = $cache->load('externalData')['matchesNotPlayed']; Is there some reason for it? The second bit is easier to write.

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• Online Database

  - by Narancha

  Hello! I want to write an application that reads blogpost from the internet and then present in my own way. The blogposts are stored in databases, so I figured that the only thing I had to do was to query an online database for the posts that I want to show.. But I can´t find a way to opoen a connecion to an online database... anyone out there with a solution to my problem? //Narancha

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• nginx subdomain rewrite

  - by ivan73

  I need a nginx rewrite rule to rewrite from: http://some-keyword.example.com to www. example.com/keyword.php?keyword=$some-keyword while domain without www in front still rewrites to www.example.com and 'www' isn't taken as a keyword. Please could you help me to solve this problem, how to write these two rules?

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• C: performance of assignments, binary operations, et cetera...

  - by Shinka

  I've heard many things about performance in C; casting is slow compared to normal assignments, functional call is slow, binary operation are much faster than normal operations, et cetera... I'm sure some of those things are specific to the architecture, and compiler optimization might make a huge difference, but I would like to see a chart to get a general idea what I should do and what I should avoid to write high-performance programs. Is there such a chart (or a website, a book, anything) ?

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