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  • Twisted + SQLAlchemy and the best way to do it.

    - by Khorkrak
    So I'm writing yet another Twisted based daemon. It'll have an xmlrpc interface as usual so I can easily communicate with it and have other processes interchange data with it as needed. This daemon needs to access a database. We've been using SQL Alchemy in place of hard coding SQL strings for our latest projects - those mostly done for web apps in Pylons. We'd like to do the same for this app and re-use library code that makes use of SQL Alchemy. So what to do? Well of course since that library was written for use in a Pylons app it's all the straight-forward blocking style code that everyone is accustomed to and all of the non-blocking is magically handled by Pylons via threading, thread locals, scoped sessions and so on. So now for Twisted I guess I'm a bit stuck. I could: Just write the sql I need directly if it's minimal and use the dbapi pool in twisted to do runInteractions etc when I need to hit the db. Use the objects and inherently blocking methods in our library and block now and then in my Twisted daemon. Bah. Use sAsync which was last updated in 2008 and kind of reuse the models we have defined already but not really and it does address code that needs to work in Pylons either. Does that even work with the latest version SQL Alchemy? Who knows. That project looked great though - why was it apparently abandoned? Spawn a separate subprocess and have it deal with the library code and all it's blocking, the results being returned back to my daemon when ready as objects marshalled via YAML over xmlrpc. Use deferToThread and then expunge the objects returned having made sure to do eager loads so that I have all my stuff that I might need. Seems kind of ugha to me. I'm also stuck using Python 2.5.4 atm so no 2.6 yet and I don't think I can just do an import from future to get access to the cool new multiprocessing module stuff in there. That's OK though I guess as we've got dealing with interprocess communication down pretty well. So I'm leaning towards option 4 mostly as that would avoid the mortal sin of logic duplication with option 1 while also staying the heck away from threads. Any better ideas?

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  • Code blocks not linking extension SDL Libraries

    - by Code Learner
    CodeBlocks is not linking extension SDL Libraries like SDL_mixer and SDL_image? I followed Lazy Foo's tutorial for SDL 1.2 but I am compiling my program in SDL 2.0. The compiler is showing an error with the linking of the libraries though without the mixer library it is working. My linker setting look like this. //This is working -lmingw32 -lSDL2main -lSDL2 //But with the additional mixer library it is not working -lmingw32 -lSDL2main -lSDL2 -lSDL_mixer Please help!

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  • What is the difference between the Control.Enter and Control.GotFocus events?

    - by jameswelle
    This may be a basic question, but I have to admit I've never truly understood what the difference between the Control.Enter and Control.GotFocus events is. http://msdn.microsoft.com/en-us/library/system.windows.forms.control.enter.aspx http://msdn.microsoft.com/en-us/library/system.windows.forms.control.gotfocus.aspx Is it a differentiation between capturing keyboard or mouse input or something else?

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  • CodeIgniter load class into class

    - by user355510
    Hello guys, i have start working with CodeIgniter, but i can't understand one think. How do i load one class into another? $this->load->library("hello_world"); This is not working? my class - load - hello_world class class myclass { function test() { $this->load->library("hello_world"); $this->hello_world->hello(); } } Message: Undefined property: myclass::$load

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  • Where does GoogleAppEngineLauncher keep the local log files?

    - by lenardgabor
    GoogleAppEngineLauncher can display the local log file of my app while it is running on my Mac during development. However, I can't change the font size there so I would like to use the tail command to watch the log file myself. It's a shame but I can't find the log files. They are not under /var/log/, ~/Library/Logs or /Library/Logs. Do you know where they are?

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  • clear command in my mac os terminal gives the following error

    - by sil
    dyld: Library not loaded: /opt/local/lib/libncursesw.5.dylib Referenced from: /opt/local/bin/clear Reason: image not found Trace/BPT trap This is what my bash_login looks like: export PATH="/usr/local/bin:/usr/local/sbin:/usr/local/mysql/bin:$PATH" export PATH="/usr/local/apache-maven-2.2.1/bin:$PATH" export PATH="~/.gem/ruby/1.8/bin:$PATH" export PATH="/usr/local/mysql/bin:$PATH" export PATH="/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home/bin:$PATH" export PATH=/opt/local/bin:/opt/local/sbin:$PATH export MANPATH=/opt/local/share/man:$MANPATH

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  • Plotting and Animating 2D points with 'headings'

    - by mellort
    I will have a set of data (x, y, heading), and I need to animate it in real-time. I am currently using matplotlib to animate (x, y) and it works fine, but I would really like to have some way to indicate heading, ie what direction the object is facing. What would be the best library for this? It seems like PyGame might be able to help me out, but would I have to roll out my own graphing library for it? Thanks

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  • Creating semaphores with unmanaged code in C++

    - by Dororo
    I've been using the MSDN Library to create semaphores, located at: http://msdn.microsoft.com/en-us/library/system.threading.semaphore.aspx However, the examples are using Managed code (requires /clr), and I need to use Unmanaged code because FreeType doesn't like working with Managed code it seems. How would I go about creating 2 simple threads which use a semaphore if I'm using unmanaged code? Many thanks for your help.

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  • How do I get the set of all letters in Java/Clojure?

    - by Jason Baker
    In Python, I can do this: >>> import string >>> string.letters 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' Is there any way to do something similar in Clojure (apart from copying and pasting the above characters somewhere)? I looked through both the Clojure standard library and the java standard library and couldn't find it.

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  • Using Flash and ActiveMQ

    - by Acet
    Hey all, Ive been using ActiveMQ as a message broker and have been able to get Flex to subscribe to a topic and receive messages using this library and flexonrails.net/?cat=26 (cant add second link) as a guide. However I've been unable to achieve the same goal in Flash. Does anyone know how to use this library in Flash or know any tutorials that could be of use?

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  • could not read symbols: Archive has no index; run ranlib to add one

    - by indu
    i tried making library with ar -r -c -s libtestlib.a *.o as given in this tutorial http://matrixprogramming.com/Tools/CompileLink.html But on linking with library following error comes g++ -o uni2asc uni2asc.o -L../Modules -ltestlib ../Modules/libtestlib.a: could not read symbols: Archive has no index; run ranlib to add one collect2: ld returned 1 exit status i tried with ranlib also but still the error comes.. im working with ubuntu9.10 Please suggest me some solution for this

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  • Question on gcc compiler commands

    - by user271916
    I had to compile a small little C program using the following; gcc sine.c -o sine -lm I needed the "-lm" because the program included the math.h. In looking this up under compiler commands man shows it a either -llibrary or -l library. I could not find any information on what other libraries. Apparently -lm is needed for math.h what other library commands might be needed. Thanks

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  • Javascript Click/Drag and Select Table rows and columns

    - by Eric V
    Hi, I am wondering if anyone knows a java script library that would add a "select" type of functionality as seen in excel/google docs where you can click and select several different parts of a row and/or column. I am looking at adding this functionality to my web application. Does anyone know where of library's preferably in java script that will be able to add this. Thanks in advance

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  • Is complete boost going to be included in C++0x?

    - by iammilind
    Many utilities of boost have been included as part of extended C++ TR1 currently. Is the complete boost library going to be included once the standard is officially out ? In other words, do I need boost library, if I have complete standard conforming C++11 compiler ? If not then any reason for that (Reliability cannot be an issue; as far as I know it's written by many people from standard committee) ?

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  • PHP text parsing and / or make your own language?

    - by AlexanderJohannesen
    Been Googling around without finding much at all, so does anyone know of a class or library that helps you parse any sort of language, like a Domain Specific Language (I'm creating one, so I'm flexible in what the syntax and format can be) into either PHP code or some helpful struct or a class hiearchy or ... ? Anything goes at this point. :) I want to experiment with parsing text files into tokens, building up a small grammar and syntax library to express things like Business Natural Languages.

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  • Java classpath in Cocoa

    - by Sreelal
    Hi , I am developing an application in cocoa which uses some java classes .I need to set the app point to /System/Library/Frameworks/JavaVM.framework/Versions/1.5.0 instead of: /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK. Is it possible to do this.. Thanks in advance

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  • Send a double click to a listview (c++, not .net!)

    - by Jorge Branco
    Hello. I want to send a double click to a listview. From what I've read on msdn it seems I gotta send a WM_NOTIFY message and something with NM_DBLCLK. But I do not understand really well hwo to implement it. I've worked with SendMessage before but MSDN is not that clear on how to fill the structs and so: WM_NOTIFY http://msdn.microsoft.com/en-us/library/bb775583(VS.85).aspx NM_DBLCLK http://msdn.microsoft.com/en-us/library/bb774867(VS.85).aspx

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