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• HttpURLConnection! Connection.getInputStream is java.io.FileNotFoundException

  - by user3643283

  I created a method "UPLPAD2" to upload file to server. Splitting my file to packets(10MB). It's OK (100%). But when i call getInputStream, i get FileNotFoundException. I think, in loop, i make new HttpURLConnection to set "setRequestProperty". This is a problem. Here's my code: @SuppressLint("NewApi") public int upload2(URL url, String…

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• ghc6 install trouble: hGetContents: invalid argument (invalid UTF-8 byte sequence)

  - by olimay

  Having trouble installing ghc6 on Ubuntu Maverick via apt. Here's what seems to be the relevant error that comes up when I try to (apt-get|aptitude) install ghc6: A package failed to install. Trying to recover: Setting up ghc6 (6.12.1-13ubuntu1) ... ghc-pkg:…

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• Pattern matching in Perl ala Haskell

  - by Paul Nathan

  In Haskell (F#, Ocaml, and others), I can do this: sign x | x > 0 = 1 | x == 0 = 0 | x < 0 = -1 Which calculates the sign of a given integer. This can concisely express certain logic flows; I've encountered…

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• Sum of Fibonacci numbers

  - by Rafal

  Hi, I'm rather new to Haskell. The problem is to find the sum of all even Fibonacci numbers not greater than 4 million. I can't use lists. If I understand correctly, the below solution is wrong, because it uses lists: my_sum = sum $ filter (even) $…

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• Can parser combination be made efficient?

  - by Jon Harrop

  Around 6 years ago, I benchmarked my own parser combinators in OCaml and found that they were ~5× slower than the parser generators on offer at the time. I recently revisited this subject and benchmarked Haskell's Parsec vs a simple hand-rolled…

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• maximize frame on startup wxWidgets

  - by snorlaks

  Hi, Im using haskell port in wxWidgets and I would like to know what to do to make frame maximized on app startup, thanks for help

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• What do you do when you feel you need a variatic list comprehension?

  - by cspyr0

  I would like to make a method where I could give it a list of lengths and it would return all combinations of cartesian coordinates up to those lengths. Easier to explain with an example: cart [2,5] Prelude> […

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• How to stop GHC from generating intermediate files?

  - by unknown

  When compiling a haskell source file via ghc --make foo.hs GHC always leaves behind a variety of intermediate files other than foo.exe. These are foo.hi and foo.o. I often end up having to delete the .hi and .o…

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• Deriving PathInfo class in web routes?

  - by drozzy

  I am reading the web-routes tutorial in Happstack, and I have no idea what this is doing: $(derivePathInfo ''Sitemap) class PathInfo a where toPathSegments :: a -> [String] fromPathSegments :: URLParser…

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• What do you do when you feel you need a variadic list comprehension?

  - by cspyr0

  I would like to make a method where I could give it a list of lengths and it would return all combinations of cartesian coordinates up to those lengths. Easier to explain with an example: cart [2,5] Prelude>…

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• Does any method exist quickly to detect valid range versions of used library

  - by daneel-yaitskov

  I'm a beginner Haskell programmer. I have written some useful code for the last six month. And I want to release a library from it. The code will use system installation cabal as any Haskell library. A library…

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• How to protect against GHC7 compiled programs taking all memory?

  - by Petr Pudlák

  When playing with various algorithms in Haskell it often happens to me that I create a program with a memory leak, as it often happens with lazy evaluation. The program taking all the memory isn't really fun,…

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• Why I am forced to write the (Data Constructor) name with first letter in small case?

  - by Optimight

  Why I am forced to write "liOfLi" in place of "LiOfLi"? Please guide. code in baby.hs LiOfLi = [ [1,3,4,5,6,8], [ 12, 13, 15, 16, 19, 20], [23, 24, 25, 45, 56] ] ghci response: ghci :l baby [1…

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• MVVM Light Toolkit throws an System.IO.FileLoadException

  - by joebeazelman

  I'm running VS 2010 along with Expression Blend 4 beta. I created a MVVM Light project from the supplied templates and I get a System.IO.FileLoadException when I try to view the MainWindow.Xaml in VS 2010…

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• java.io.IOException: Bad DNS address - in opening a HttpConnection

  - by Shreyas

  Hi, I m opening a HttpConnection to a URL. Its working in simulator but when i try it in device, it gives "java.io.IOException: Bad DNS address" while opening the HttpConnection. I serached the forums but…

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• Does Python's shelve module use memory-mapped IO?

  - by Matt Luongo

  Does anyone know if Python's shelve module uses memory-mapped IO? Maybe that question is a bit misleading. I realize that shelve uses an underlying dbm-style module to do its dirty work. What are the…

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• Read/Write operation on Fat table with out using System.IO in C#

  - by AZHAR

  Hi i am new to the system programming...i want to read information from fat table like total sector,total physical drive,containing logical drive types and as well containing files in the drives(like…

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• System.IO.Pipes on Windows 2000

  - by Barry Barsson

  Is there any way to get .NET 3.5 working on Windows 2000? Specifically, the only part I need is the System.Core.dll to use the System.IO.Pipes namespace. Hackish workaround methods are fine, if…

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• IO Exception: directory name is invalid using directory from File System Watcher OnChanged Event

  - by Bi

  My C# application throws a System.IO.IOExcepton (The directory name is invalid) for the following code for implementing a filewatcher: public void OnChanged(object source,…

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• Emulate disk IO speeds in Android SDK

  - by Ben L.

  I don't have a physical Android device to work with, so all I can use is the emulator. I'm wondering if there's something I could use to make the IO speeds more realistic -…

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• Fatal IO error 0 (Success) on X server

  - by Ori Pessach

  What does the error "Fatal IO error 0 (Success) on X server" mean? The error is produced when an X client tries to call XvCreateImage(), and it results in the client…

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• Haskell: grid in wxHaskell

  - by snorlaks

  Hello, Could someone explain me what this code does line by line ? how t ounderstand excactly first line with declaration ? what does it mean: [Prop (Grid ())]? …

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• IO Exception: directory name is invalid C#

  - by Bi

  My C# application throws a System.IO.IOExcepton (The directory name is invalid) for the following code for implementing a filewatcher: public void…

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• Read File allocation table without using System.IO

  - by AZHAR

  i have a problem which is that i want to extract information about FAT(file allocation table) in C# but the restriction is i cannot use System.IO…

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• No IO exception reported for socket operation when the interface is removed

  - by user352536

  The wifi network is connected, the application setup a socket connection and exchange data with the remote server. But when turn off the wifi,…

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