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  • The easiest way to draw an image?

    - by Benno
    Assume you want to read an image file in a common file format from the hard drive, change the color of one pixel, and display the resulting image to the screen, in C++. Which (open-source) libraries would you recommend to accomplish the above with the least amount of code? Alternatively, which libraries would do the above in the most elegant way possible? A bit of background: I have been reading a lot of computer graphics literature recently, and there are lots of relatively easy, pixel-based algorithms which I'd like to implement. However, while the algorithm itself would usually be straightforward to implement, the necessary amount of frame-work to manipulate an image on a per-pixel basis and display the result stopped me from doing it.

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  • MinGW screw up with COLORREF and RGB

    - by kjoppy
    I am trying to build a 3rd party open source project using MinGW. One of the dependencies is wxWidgets. When I try to make the project from MSYS I get a compiler error from /MinGW/msys/1.0/local/include/wx-2.8/wx/msw/private.h In function 'COLORREF wxColourToRGB(const wxColour&)': error: cannot convert 'RGB' to 'COLORREF {aka long unsigned in}' in return This is somewhat odd given that, according to Microsoft the RGB macro returns a COLORREF. In fact, looking in H:\MinGW\include I find wingdi.h with the following code #define RGB(r,g,b) ((COLORREF)((BYTE)(r)|((BYTE)(g) << 8)|((BYTE)(b) << 16))) What sort of thing would cause this error? Is there some way I can check to see if COLORREF and RGB are being included from wingdi.h and not somewhere else? Is that even worth checking? Specifications GCC version 4.7.2 wxWidgets version 2.8.12 (I'm new to C++ and MinGW specifically but generally computer and programming literate)

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  • javascript button click casuing Internet Explorer secuirty exception...

    - by hp
    Hello, I have a application that allows a user to choose some parameters for a powerpoint report, run the report, then allow the user to "save" or "open" the powerpoint file. I got all of that working OK. When you click on "run" report, it pops open a window which generates the report, stores it in session, then closes the window. I have a button on the main page that will export the report. So, now, when the pop up window that generates the report is finished, i use "window.opener" to call a javascript method on the main page, that will do a javascript click of the button. when this button is pressed, Internet Explorer gives me the following message : "To help protect your security, Internet Explorer blocked this site from downloading files to your computer.." Do you guys know of any tricks around this?

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  • how to get files as they are added to a remote server

    - by Jordan
    I am using a bash script (below) on a remote server (so far using ssh to connect) to execute a python script that downloads a lot of pdf files one at a time (getting the download locations from a text file with the URL's) in a loop. I would like to move the files from the remote server to my local computer as they are downloaded, and then delete the file from the remote server. Is there a way that I can expand my bash script to do this? Or are there alternatives for completing this task? while read line; do python python_script.py -l $line; done < pdfURLs.txt

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  • Is gzip compression useful for mobile devices?

    - by Savageman
    Hi SO, I'm wondering if anyone has a clue on whether the gzip compression is as much useful on mobile devices than it is on a desktop computer. Will the phone use more battery? Or will it save some because of the bandwidth saving? Will the page page load faster or is the uncompress process slow on those limited devices? Does the compressed data actually reach the end-user or is it uncompressed somewhere by the 3G provider? (this may be a stupid question, sorry). Thank you.

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  • Java and Different Types of Stacks

    - by Rarge
    Currently the only stack I know anything about is Vector, I normally use this in place of an array but I understand that there is other types of stacks and they all suit different jobs. The project I am currently working on requires me to be inserting objects in a certain position inside a stack, not always the front of the stack and I am under the impression that a Vector may not be the best class for this job. Could somebody please give me a brief description of the other types of stacks available to me with the Java language and their advantages and disadvantages? Are these names homogeneous? E.g. Are they only used in the Java language or are they used as general terms in Computer Science? Thank you

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  • how to Calculate number of address bits needed for memory?

    - by leon
    Hi I am preparing my exam for computer system. I don't quite understand how to calculate the number of address bits needed for the memory. For example, Suppose that a 1G x 32-bit main memory is built using 256M x 4-bit RAM chips and this memory is word-addressable. What is the number of address bits needed for a memory module? What is the number of address bits needed for the full memory? And what about If the memory is byte addressable, what would be the solutions? Many thanks

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  • help with installing clamav for remote apache server vs WAMP localserver

    - by Scarface
    Hey guys, I have never installed an extension before so I am not really sure where to start. I want to do 2 things: install clamav virus scanner http://sourceforge.net/projects/php-clamav/ on my remote server which is a linux apache setup using cpanel as a gui. install clamav on my localserver on my home computer which operates on windows and has WAMP server installed for server-side activity What is the difference between the two installation methods? What is required for each installation? If anyone can point me in the right direction in any way, I would really appreciate it. Even if it is just an article or tutorial on how to get started.

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  • iphone singleton object synchronization

    - by user127091
    I'm working on an iphone app but this is probably a general question. I have a singleton Model class and there would be scenarios where multiple NSOperations (threads) would exist and work with the singleton object. If they all call the same method in this object, do i need to have some locking mechanism? Or can this method be executed only one at a time? I do not have a computer science background but my guess is that all threads would have their CALL to the same address (this method). Also can you please suggest a good beginner programming book that discusses general programming concepts. I don't have the brains for Knuth kinda books.

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  • Cookie Value not available, why?

    - by Camran
    I have tested this on my development computer, but now I have uploaded everything to the production server and I cant read out the value of the cookie. I think the problem lies in the Serialization and Unserialization. if (isset($_COOKIE['watched_ads'])){ $expir = time()+1728000; //20 days $ad_arr = unserialize($_COOKIE['watched_ads']); // HERE IS THE PROBLEM $arr_elem = count($ad_arr); if (in_array($ad_id, $ad_arr) == FALSE){ if ($arr_elem>10){ array_shift($ad_arr); } $ad_arr[]=$ad_id; setcookie('watched_ads', serialize($ad_arr), $expir, '/'); } } When I echo this: count($ad_arr) I receive the expected nr, 1 in this case, so there is a value there. But when I echo the value: echo $ad_arr[0]; I get nothing. Completely blank. No text at all. Anybody have a clue? if you need more info about something let me know...

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  • How to run a program in python?

    - by Luka Mihaldinec
    this is my code. I'm trying to make a script which would run an .exe file from my computer. And this one isn't working :/ I think I'm using the wrong command.. I tried all the other commands like import os, os.startfile, but they won't work too. I think my code is just wrong :P loop=0 while loop==0: answer=raw_input("coded by: Narralol\n\n" "Pick a task:\n" "1) Start Minecraft.exe\n" "2) Start Minecraft_Server.jar\n" "3) Backup your server\n" "4) Copy the backup to your desktop\n" "5) Exit\n") if answer==1: execfile('D:\Games\Minecraft\Minecraft.exe') elif answer==2: execfile('D:\Games\Minecraft\Minecraft_server.jar') elif answer==5: loop=1

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  • What to add to git repo?

    - by Ryan
    I am doing a video player. I have the following in my project folder: these four dirs should each be on their own line: /source /sample_applications /images /videos Right now the repo just includes the /source directory...which is code only. It is on my local computer. I am thinking of adding it to git hub. My question is: should I add the sample apps, the images and the videos to the repo? Is that something that people normally do and that other people want people to do? Can git even handle videos(noob here)?

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  • How do I make my browser brute force an input field?

    - by user210904
    Hi, There's a website I frequent that gives codes such as GD??Q-TPY32-TPTT3-9CM9P-F2QMQ and hints that the ?? is a number and a letter. If you're the first to unlock the code you can redeem the modest prize. So the obvious way to solve this problem is to brute-force the code. But obviously I don't want to sit in front of the computer for an hour to manually input all 10 * 26 combinations. Is there a way for me to tell my browser to input these codes (assume that each 5-character block is an individual text field). Or is there a special browser that enables some sort of macro-type feature? Thanks.

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  • how to re-factor a web site for 3G?

    - by George2
    Hello everyone, I have a traditional web site which serves users from desktop computer browsers. I am using Microsoft technologies, like ASP.Net, C#, .Net, SQL Server 2008, IIS and Windows Server 2008. Nowadays, more and more users are using 3G mobile phones, and I am wondering from software perspective, how to add new features to my web site (do I need a client application runs on mobile phone as well?) so that 3G users could have good user experience or new kinds of 3G specific applications? Any recommended documents or real samples are welcome. For 3G users, I want to distinguish from traditional less-powered and slow network access GPRS mobile phone. thanks in advance, George

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  • Just an experiment changing the application data path

    - by Arthur
    When I change the Appication Data path in windows xp registry to a network folder I get this error message on the next system startup: "windows cannot load the user's profile but has logged you with the default profile system" The registry keys are: "[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]" "[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders]" under the names "AppData" and "Local AppData" I dont care if "Windows logins you with the default profile system" but is there a way to disable that message, or change the message timeout form 30 seconds to 0?,or maybe create an script that changes the Application Data path every system startup? P.S. The computer with the shared folder is always on.

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  • In order to bypass a website's login screen, can you load a link with a username and password?

    - by Jeff
    I am relatively new to web development, and I was hoping I could get some pointers about the feasibility of a feature I would like to implement. Is it possible to have a url link that you can click on, that can contain login credentials for the website it is linking to, so as to bypass that websites login screen? In other words, can I make a link from my website to facebook, that would allow me to login right in to my facebook, from any computer? Meaning, if I don't have cookies to store my login info in, is it possible to login still? This is just a conceptual question, so any help would be appreciated! Thanks!

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  • Scrapy + Eclipse PyDev : how to setup the debugger?

    - by AsTeR
    I've successfully setup Eclipse with my Scrapy project. I did it by setting a new Run/Debug configuration : Whose main module links to Scrapy /usr/local/bin/scrapy for me (I've found suggestion to use cmdline.py but that failed on my computer (OSX Lion & scrapy installed through easy_install) Defining the arguments to send "crawl ny" in my case as I would if I used the Scrapy command line Setting the correct working directory (${workspace_loc:My Project/src} in my case) Eclipse can successfully launch my project, but I've no debbuger. I'm missing my breakpoints and variable inspection, does anyone know how to setup the debbugger with this environment ?

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  • PreparedStatement and setTimestamp in oracle jdbc

    - by Roman
    Hi everyone, I am using PreparedStatement with Timestamp in where clause: PreparedStatement s=c.prepareStatement("select utctimestamp from t where utctimestamp>=? and utctimestamp<?"); s.setTimestamp(1, new Timestamp(1273017600000L)); //2010-05-05 00:00 GMT s.setTimestamp(2, new Timestamp(1273104000000L)); //2010-05-06 00:00 GMT The result I get is different, when I have different time zones on the client computer. Is this a bug in Oracle jdbc? or correct behavior? The parameter is Timestamp, and I expected that no time conversions will be done on the way. The database column type is DATE, but I also checked it with TIMESTAMP column type with the same results. Is there a way to achieve correct result? I cannot change default timezone in the the whole application to UTC. Thanks for your help

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  • Condor job using DAG with some jobs needing to run the same host

    - by gurney alex
    I have a computation task which is split in several individual program executions, with dependencies. I'm using Condor 7 as task scheduler (with the Vanilla Universe, due do constraints on the programs beyond my reach, so no checkpointing is involved), so DAG looks like a natural solution. However some of the programs need to run on the same host. I could not find a reference on how to do this in the Condor manuals. Example DAG file: JOB A A.condor JOB B B.condor JOB C C.condor JOB D D.condor PARENT A CHILD B C PARENT B C CHILD D I need to express that B and D need to be run on the same computer node, without breaking the parallel execution of B and C. Thanks for your help.

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  • IIS Not working

    - by 3bd
    I have a web site that built on Visual studio 2008 and i need to run it from my computer (Win 7 Ultimate) as a server I tried to publish it to IIS and this is simply not working and i have the flowing error : Error Summary HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid. Config Error This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false". any one can help?

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  • Security Policy not working, as3

    - by VideoDnd
    How to I get my security policy working? My parent swf parses an XML doc and loads 2 children. It throws a 2148 security error, and only works in the Flash IDE. PARENT SWF flash.system.Security.loadPolicyFile("crossdomain.xml"); I've referenced my security file from my swf. I Also published my parent swf as 'network only' and put all the crossdomain.xml and everything else in the same folder. I need to click on the animations and have them place from a local computer at a kiosk. Any suggestions? POLICY FILE <?xml version=\"1.0\"?> <!DOCTYPE cross-domain-policy SYSTEM \"/xml/dtds/cross-domain-policy.dtd\"> <cross-domain-policy> <site-control permitted-cross-domain-policies=\"master-only\"/> <allow-access-from domain=\"*\" to-ports=\"*\" secure=\"false\" /> </cross-domain-policy>"

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  • the breakpoint will not currently be hit no symbols loaded

    - by Carlos_Liu
    I want to debug on the customer's machine (Windows Server 2003) to track a problem, and out product is based on .NET 2.0. I want to use DbgCLR.exe to debug a file AAA.dll, what I did is: install .NET 2.0 SDK on the customer's machine (to get the DbgCLR.exe) copy the symbol file AAA.pdb to the same directory with AAA.dll get the source file for AAA.dll the AAA.dll will be loaded by w3wp.exe, so in the DbgCLR Tools-Attach to Process, then I choose w3wp.exe File-Open-File open the source file and add a breakpoint in the function which will be callled but the breakpoint seems do no work because there is an warning icon on it and says : the breakpoint will not currently be hit. No symbols have been loaded for this document. On my computer (Windows XP) which has the debug version of whole source code, I did nearly the same thing as above but the different is: I attached aspnet_wp.exe to do the debug and it works What should I do to let it work on the customer's machine?

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  • Accessing a webpage in C++

    - by wyatt
    Is there a good, simple library which allows C++ to load a webpage? I just want to grab the source as text. I'm not using any IDE or significant library, just straight command line. Tangentially, is there something fundamental I'm missing about programming in C++? I would think any language in common use today would have droves of web-based functionality, being so central to computer usage, but I can find next to no discussion on how to accomplish it. I realise C++ significantly predates the modern internet, so it lacking any core ability in the regard is reasonable, but the fact that relevant libraries seem so sparse is baffling. Thanks for your help.

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  • What FPGAs (Field-Programmable Gate Arrays) can one buy to experiment with at home?

    - by Joe Blow
    What the heck is an FPGA -- where can I buy one? What sort of system do you need to experiment with them? How to program them? Can you "load" if that's the right terms an FPGA using an ordinary mac or perhaps other *nix or windoze computer? Where can I buy some FPGAs today to experiment with ??! Are they expensive this only available to industry or can I buy one today? Does anyone know about this? Thanks! I have become interested in FPGAs after reading this question... Holistic Word Recognition algorithm in detail

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  • Multiple things at once (Threads?)

    - by Jonathan
    All, What is a really simple way of having a program do more than one thing at once, even if the computer does not necessarily have multiple 'cores'. Can I do this by creating more than one Thread? My goal is to be able to have two computers networked (through Sockets) to respond to each-other's requests, while my program will at the same time be able to be managing a UI. I want the server to potentially handle more than one client at the same time as well. My understanding is that the communication is done with BufferedReader.readLine() and PrintWriter.println(). My problem is that I want the server to be waiting on multiple readLine() requests, and also be doing other things. How do I handle this? Many thanks, Jonathan

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