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  • How would you communicate with aliens as a computer scientist?

    - by Pyrolistical
    Let's say aliens arrive on Earth and instead of just sending mathematicians and linguistic experts governments around the work decide to send an expert of major field. After a quick round of sorting you are paired up with an alien computer scientist. Given you don't understand each others language how would you using computer science to start the ground work of communication? eg. We know binary is universal, but not the way we write it. The symbols are not universal nor is the the direction we write it (MSB vs LSB and left vs right) Assume aliens are "similar" to us physically it won't impede visual communication.

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  • Allow native DLL to output stdout / stderr in c# console application

    - by xaw
    I have a native DLL which outputs via stdout / stderr. I have a C# console application which calls this DLL and outputs binary data to a parent C# application which started the C# console exe, processing stdout / stderr. Currently when I call the C# exe it works just fine (the DLL hooks up to the stdout of my console application and puts its data in just fine). Is this by design (and shouldn't be broken in future .NET framework versions)? Are there limitations on my managed code's deployment with this strategy (full-trust, permission requirements, GAC issues, etc)? I can't seem to find any documentation about stdout with a managed exe and an unmanaged dll both putting data in that standard output on MSDN. Thanks,

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  • How to build march-0 for different architectures?

    - by Victor Lin
    I have some dylibs to load from python with ctypes. I can load libbass.dylib without problem, but I can't load the self-compiled libmp3lame.dylib. Here is the error I get. OSError: dlopen(libmp3lame.dylib, 6): no suitable image found. Did find: libmp3lame.dylib: mach-o, but wrong architecture Then, I inspect the file type of those libs. Here is the result of libbass.dylib: libbass.dylib: Mach-O universal binary with 2 architectures libbass.dylib (for architecture i386): Mach-O dynamically linked shared library i386 libbass.dylib (for architecture ppc): Mach-O dynamically linked shared library ppc And here is the self-compiled one: libmp3lame.dylib: Mach-O 64-bit dynamically linked shared library x86_64 I did compile the lame library with the install instructions: ./configure make make install I'm new to mac system, here comes the problem: how to build the libmp3lame.dylib so that it supports different architecture I want? Thanks.

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  • Code golf: Reverse Polish notation (postfix) evaluator

    - by Dario
    After having had code-golf contests on ordinary mathematical expressions, I just thought it would also be quite interesting how short an evaluation function for postfix notation (RPN) can be. Examples for RPN: 1 2 + == 3 1 2 + 3 * == 9 0 1 2 3 + + - 2 6 * + 3 / 1 - == 1 3 2 / 2.0 + == 3.5 To make things shorter, only +, -, * and /, all just in their binary version, must be supported. Operators/Operands are delimited by one space, divsions by zero don't have to be handled. The resulting code should be a function that takes the postfix string as input and returns the resulting number.

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  • Some basic COM question...

    - by smwikipedia
    I have just finished my first COM server DLL. And it runs smoothly. So I'd like to show my understanding for now and hear your critics. 1- How COM simply works? COM - "The Call Chain" COM Lib methods - Traditional DLL exports - Classes encapsulated in the COM DLL 2- With C++, the benefits like "interface" in OOP can only be taken advantage of at the source level. With COM, these benefits can be used at a binary level. 3- Some illustration about interface &pInterface ------- pInterface ---------- Interface----------------- methods Ixx ** Ixx * (method table) (void **) A Interface is a data structure in memory. It's nothing but a memory area containg a method table. Is my understanding alright? Thanks for your revision.

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  • How do I use the Silicon Laboratories IDE with SDCC?

    - by David Cary
    I'm thinking about using a microcontroller with an 8051 core from Silicon Laboratories. I hope that I can use C rather than assembly language, so I installed SDCC. I installed the "Silicon Laboratories IDE" to download the executable binaries to the on-chip Flash program memory. It also supposedly can be set up (under the Project Tool Chain Integration menu) to use "any" 8051 compiler. I tried to set it up to use SDCC, but every time I hit the "Assemble/Compile File" button it tells me "Compiler process did not sucessfully complete." How do I get new C code I write onto the SiLabs C8051F310 chip? Is there a web site with a step-by-step HOWTO? (Would it be easier to use a MAKEFILE that calls SDCC, only using the "Silicon Laboratories IDE" for the very last step of downloading the executable binary to the chip?)

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  • Syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in PHP

    - by pmms
    mysql_connect("localhost","root",""); mysql_select_db("hitnrunf_db"); $result=mysql_query("select * from jos_users INTO OUTFILE 'users.csv' FIELDS ESCAPED BY '""' TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '\n' "); header("Content-type: text/plain"); header("Content-Disposition: attachment; filename=your_desired_name.xls"); header("Content-Transfer-Encoding: binary"); header("Pragma: no-cache"); header("Expires: 0"); print "$header\n$data"; in the above code in query string i.e string in side mysql_quey we are getting following error Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in C:\wamp\www\samples\mysql_excel\exel_outfile.php on line 8 in query string '\n' charter is not identifying as string thats why above error getting

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  • Why does gcc add symbols to non-debug build?

    - by Matt Holgate
    When I do a release build with gcc (i.e. I do not specify -g), I still seem to end up with symbols in the binary, and have to use strip to remove them. In fact, I can still breakpoint functions and get backtraces in gdb (albeit without line numbers). This surprised me - can anyone explain why this happens? e.g. #include <stdio.h> static void blah(void) { printf("hello world\n"); } int main(int argc, char *argv[]) { blah(); return 0; } gcc -o foo foo.c nm foo | grep blah: 08048374 t blah

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  • using sqlite3 with lua

    - by mr calendar
    I'm trying to use sqlite3 with lua (am already using c++, but I'm a n00b with lua- I read this) but I'm getting the following when trying to build the library or whatever: C:\lib\lsqlite3-7>mingw32-make process_begin: CreateProcess(NULL, pkg-config --version, ...) failed. makefile:53: *** windows32. Stop. I'm not at all surprised at a makefile failing but I can't do them (is it spaces or tabs? where is it they have to go?), I would have thought there was a binary for windows? Any simple answers appreciated. I haven't got the time to learn make or install cygwin or whatever.

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  • How to build mach-0 for different architectures?

    - by Victor Lin
    I have some dylibs to load from python with ctypes. I can load libbass.dylib without problem, but I can't load the self-compiled libmp3lame.dylib. Here is the error I get. OSError: dlopen(libmp3lame.dylib, 6): no suitable image found. Did find: libmp3lame.dylib: mach-o, but wrong architecture Then, I inspect the file type of those libs. Here is the result of libbass.dylib: libbass.dylib: Mach-O universal binary with 2 architectures libbass.dylib (for architecture i386): Mach-O dynamically linked shared library i386 libbass.dylib (for architecture ppc): Mach-O dynamically linked shared library ppc And here is the self-compiled one: libmp3lame.dylib: Mach-O 64-bit dynamically linked shared library x86_64 I did compile the lame library with the install instructions: ./configure make make install I'm new to mac system, here comes the problem: how to build the libmp3lame.dylib so that it supports different architecture I want? Thanks.

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  • Error when using --static option with macrubyc

    - by Jakub Hampl
    I want to create a binary executable for a relatively simple script that would not require people to install macruby or HotCocoa. The script is here. I've understood that I want to use the --static option for the compiler and I'm using the following command: macrubyc -o postprocessor --static postprocessor.rb I get the following error: ld: library not found for -lLLVMBitWriter collect2: ld returned 1 exit status Error when executing `/usr/bin/g++ -o "postprocessor" -arch x86_64 -L/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/lib -lmacruby-static -L/usr/local/lib -lpthread -lffi -lm -lLLVMBitWriter -lLLVMX86CodeGen -lLLVMX86Info -lLLVMSelectionDAG -lLLVMAsmPrinter -lLLVMJIT -lLLVMExecutionEngine -lLLVMCodeGen -lLLVMScalarOpts -lLLVMTransformUtils -lLLVMipa -lLLVMAnalysis -lLLVMTarget -lLLVMMC -lLLVMCore -lLLVMSupport -lLLVMSystem -lpthread -ldl -lxml2 -lobjc -lauto -licucore -framework Foundation "/var/folders/wU/wUGgoG1JGeKBgwalWLPMAU+++TI/-Tmp-/main-72203.o" "./postprocessor.o"' What should I do to get this running?

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  • Problem running gems in OS X

    - by akarnid
    I'm running Snow Leopard, and installed a custom built Ruby according to the guide here: http://hivelogic.com/articles/compiling-ruby-rubygems-and-rails-on-snow-leopard . My ruby binary lives in usr/local/bin/ruby and my gems are installed in /usr/local/bin/gem . My gem env looks like so: RUBY VERSION: 1.8.7 (2008-08-11 patchlevel 72) [universal-darwin10.0] - INSTALLATION DIRECTORY: /Library/Ruby/Gems/1.8 - RUBY EXECUTABLE: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby - EXECUTABLE DIRECTORY: /usr/bin I think I may have borked the install since all actions taked on gems give the error: ERROR: While executing gem ... (Errno::EEXIST) File exists - /usr/local/bin/ruby How do you edit the environment variables for the gem environment? And for those of you on OS X and using ruby AND gems, what did you use to get yourself up and running? I'm thinking of just nuking everything and starting anew.

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  • Get country location of an IP with native PHP

    - by Mint
    Read on before you say this is a duplicate, it's not. (as far as I could see) I want to get the county code in php from the client. Yes I know you can do this using external sites or with the likes of "geoip_record_by_name" but I don't want to be dependent on an external site, and I can't install "pear" for php as im using shard Dreamhost hosting. I thought I could just do something like this: $output = shell_exec('whois '.$ip.' -H | grep country | awk \'{print $2}\''); echo "<pre>$output</pre>"; But dreamhost seems to have an old version of whois (4.7.5), so I get this error on allot of IPs: Unknown AS number or IP network. Please upgrade this program. So unless someone knows how to get a binary of a newer version of whois onto dreamhost im stuck. Or is there another way I could get the country code from the client who is loading the page?

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  • Any way to select without causing locking in MySQL?

    - by Shore
    Query: SELECT COUNT(online.account_id) cnt from online; But online table is also modified by an event, so frequently I can see lock by running show processlist. Is there any grammar in MySQL that can make select statement not causing locks? And I've forgotten to mention above that it's on a MySQL slave database. After I added into my.cnf:transaction-isolation = READ-UNCOMMITTED the slave will meet with error: Error 'Binary logging not possible. Message: Transaction level 'READ-UNCOMMITTED' in InnoDB is not safe for binlog mode 'STATEMENT'' on query So, is there a compatible way to do this?

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  • when does a software become "proprietary" ?

    - by wefwgeweg
    say a company is using Open source libraries, or programs, and packaging it into a proprietary solution. or perhaps, the engineers have copy pasted certain section of those open source libraries and have compiled it now, into a very useful "proprietary" software suite. what legal troubles will this company face if any ? are you allowed to do this ? i mean the customer doesn't see the source codes, only runs the binary files on their computer. for example, i find an excellent NLP library in python, and decide to use it in my program that i am selling for $4000 USD (i write like 10 lines of code and let the library do the work). could i get into trouble ? would i need to write the NLP library myself from scratch to be considered "proprietary" ? danke

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  • Java library to encode / decode AMF

    - by Ceilingfish
    Hi chaps, I currently have a Java server that talks to a Flash client by passing JSON encoded data over a binary socket connection. Is there a way on either side to encode / decode packets as AMF instead of JSON? It seems to me that there should be some native support in Flash player for doing this? All the implementations I have found of AMF serialization seem to be embedded inside an application framework. Simiarly so, does anyone know if it's possible to decode AMF packets independently of a connection implementation in Flash?

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  • how to omit extra bits in a file?

    - by thinthinyu
    I want to omit extra bit in txt file.eg ....ÿ 0111111110111101100011011010010001 in this string we want to omit extra bit "ÿ " which is appeared when we save a binary string. Save fun is as follow. please help me. void LFSR_ECDlg::Onsave() { this-UpdateData(); CFile bitstream; char strFilter[] = { "Stream Records (*.mpl)|*.mpl| (*.pis)|*.pis|All Files (*.*)|*.*||" }; CFileDialog FileDlg(FALSE, ".mpl", NULL, 0, strFilter); if( FileDlg.DoModal() == IDOK ) { if( bitstream.Open(FileDlg.GetFileName(), CFile::modeCreate | CFile::modeWrite) == FALSE ) return; CArchive ar(&bitstream, CArchive::store); CString txt; txt=""; txt.Format("%s",m_B);//by ANO AfxMessageBox (txt);//by ANO txt=m_B;//by ANO ar <<txt;//by ANO ar.Close(); } else return; bitstream.Close();

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  • Symbolicating iPhone App Crash Reports

    - by Jasarien
    I'm looking to try and symbolicate my iPhone app's crash reports. I retrieved the crash reports from iTunes Connect. I have the application binary that I submitted to the App Store and I have the dSYM file that was generated as part of the build. I have all of these files together inside a single directory that is indexed by spotlight. What now? I have tried invoking: symbolicatecrash crashreport.crash myApp.app.dSYM and it just outputs the same text that is in the crash report to start with, not symbolicated. Am I doing something wrong? Any help would be greatly appreciated, thanks.

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  • How to handle packages provided Java using Eclipse P2

    - by ctron
    I got some OSGi bundles in binary form that declare dependencies to bundles like "org.ietf.jgss" which are provided by Java itself. P2 detects these dependencies and when I try to install the product later using the P2 director application the installation fails since no bundle provides these packages. But if I use the P2 product build I get a complete installed product that I can use. My problem is that I don't want to create product files and build for each variation of the application. So tried the approach to copy all P2 repositories in order to install the product on the target system using the P2 director. So how do I handle dependencies to packages provided by Java and how to I "convince" P2 to ignore these packages if they are provided by Java itself. Thanks for helping.

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  • Does Android support near real time push notification

    - by j pimmel
    I recently learned about the ability of iPhone apps to receive nearly instantaneous notifications to apps. This is provided in the form of push notifications, a bespoke protocol which keeps an always on data connection to the iPhone and messages binary packets to the app, which pops up alerts incredibly quickly, between 0.5 - 5 seconds from server app send to phone app response time. This is sent as data - rather than SMS - in very very small packets charged as part of the data plan not as incoming messages. I would like to know if using Android there is either a similar facility, or whether it's possible to implement something close to this using Android APIs. To clarify I define similar as: Not an SMS message, but some data driven solution As real time as is possible Is scalable - ie: as the server part of a mobile app, I could notify thousands of app instances in seconds I appreciate the app could be pull based, HTTP request/response style, but ideally I don't want to to be polling that heavily just to check for notification .. besides which it's like drip draining the data plan.

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  • Haskell optimization of a function looking for a bytestring terminator

    - by me2
    Profiling of some code showed that about 65% of the time I was inside the following code. What it does is use the Data.Binary.Get monad to walk through a bytestring looking for the terminator. If it detects 0xff, it checks if the next byte is 0x00. If it is, it drops the 0x00 and continues. If it is not 0x00, then it drops both bytes and the resulting list of bytes is converted to a bytestring and returned. Any obvious ways to optimize this? I can't see it. parseECS = f [] False where f acc ff = do b <- getWord8 if ff then if b == 0x00 then f (0xff:acc) False else return $ L.pack (reverse acc) else if b == 0xff then f acc True else f (b:acc) False

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  • Gtk+ vs Qt language bindings

    - by Adam Smith
    Put shortly: For those familiar with language bindings in Qt and Gtk+. E.g. python and ruby. Are there any quality or capability difference? More background: I know C++ and Qt very well. Minimal experience with Gtk+. I know C++ is not ideal for language bindings due to the lack of a well defined ABI (application binary interface). I also read that Gtk+ was designed to be bound to other languages. So I wonder how this manifets itself in practice. Are the Gtk+ bindings better maintained or work better in some way than their Qt counterparts? I am presently quite interested in the Go language, and they have started developing Gtk+ bindings. However C++ bindings is far away. It makes me wonder whether learning Gtk+ is worth it.

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  • Excel 2010 Access to path is denied temp

    - by Chris Anderson
    I am using excel data reader to read data from an excel file. FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read); //1. Reading from a binary Excel file ('97-2003 format; *.xls) IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream); //2. Reading from a OpenXml Excel file (2007 format; *.xlsx) IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream); http://exceldatareader.codeplex.com/ This reads excel 1997-2003 format and excel 2007 format on my local machine and when we move it to our test server. However, when moved to production, it works for excel 97-2003 files, but when I try to read 2007 files I receive the following error: Access to the path 'C:\Documents and Settings\PORTALS03\ASPNET\LOCALS~1\Temp\TMP_Z129388041687919815' is denied. How is it possible that the 97-2003 excel file can be read but the 2007 files throw access is denied?

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  • social networking website database management

    - by Anup Prakash
    This could be very basic type of question for you! But for me it is very important. 1) How these(orkut, facebook or other) website store the images in server? Options: a) Keeping all the images in database by converting into bytecode/binary. b) Making a new folder for each user and saving photographs according to their library name. c) Or something else which i(Anup) didn't guess yet. Please reply me. Sayiing thanx to see my question and any many many thanx for answering my question.

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  • plupload variable upload path?

    - by SoulieBaby
    Hi all, I'm using plupload to upload files to my server (http://www.plupload.com/index.php), however I wanted to know if there was any way of making the upload path variable. Basically I need to select the upload path folder first, then choose the files using plupload and then upload to the initially selected folder. I've tried a few different ways but I can't seem to pass along the variable folder path to the upload.php file. I'm using the flash version of plupload. If someone could help me out, that would be fantastic!! :) Here's my plupload jquery: jQuery.noConflict(); jQuery(document).ready(function() { jQuery("#flash_uploader").pluploadQueue({ // General settings runtimes: 'flash', url: '/assets/upload/upload.php', max_file_size: '10mb', chunk_size: '1mb', unique_names: false, // Resize images on clientside if we can resize: {width: 500, height: 350, quality: 100}, // Flash settings flash_swf_url: '/assets/upload/flash/plupload.flash.swf' }); }); And here's the upload.php file: <?php /** * upload.php * * Copyright 2009, Moxiecode Systems AB * Released under GPL License. * * License: http://www.plupload.com/license * Contributing: http://www.plupload.com/contributing */ // HTTP headers for no cache etc header('Content-type: text/plain; charset=UTF-8'); header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT"); header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); header("Pragma: no-cache"); // Settings $targetDir = $_SERVER['DOCUMENT_ROOT']."/tmp/uploads"; //temp directory <- need these to be variable $finalDir = $_SERVER['DOCUMENT_ROOT']."/tmp/uploads2"; //final directory <- need these to be variable $cleanupTargetDir = true; // Remove old files $maxFileAge = 60 * 60; // Temp file age in seconds // 5 minutes execution time @set_time_limit(5 * 60); // usleep(5000); // Get parameters $chunk = isset($_REQUEST["chunk"]) ? $_REQUEST["chunk"] : 0; $chunks = isset($_REQUEST["chunks"]) ? $_REQUEST["chunks"] : 0; $fileName = isset($_REQUEST["name"]) ? $_REQUEST["name"] : ''; // Clean the fileName for security reasons $fileName = preg_replace('/[^\w\._]+/', '', $fileName); // Create target dir if (!file_exists($targetDir)) @mkdir($targetDir); // Remove old temp files if (is_dir($targetDir) && ($dir = opendir($targetDir))) { while (($file = readdir($dir)) !== false) { $filePath = $targetDir . DIRECTORY_SEPARATOR . $file; // Remove temp files if they are older than the max age if (preg_match('/\\.tmp$/', $file) && (filemtime($filePath) < time() - $maxFileAge)) @unlink($filePath); } closedir($dir); } else die('{"jsonrpc" : "2.0", "error" : {"code": 100, "message": "Failed to open temp directory."}, "id" : "id"}'); // Look for the content type header if (isset($_SERVER["HTTP_CONTENT_TYPE"])) $contentType = $_SERVER["HTTP_CONTENT_TYPE"]; if (isset($_SERVER["CONTENT_TYPE"])) $contentType = $_SERVER["CONTENT_TYPE"]; if (strpos($contentType, "multipart") !== false) { if (isset($_FILES['file']['tmp_name']) && is_uploaded_file($_FILES['file']['tmp_name'])) { // Open temp file $out = fopen($targetDir . DIRECTORY_SEPARATOR . $fileName, $chunk == 0 ? "wb" : "ab"); if ($out) { // Read binary input stream and append it to temp file $in = fopen($_FILES['file']['tmp_name'], "rb"); if ($in) { while ($buff = fread($in, 4096)) fwrite($out, $buff); } else die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}'); fclose($out); unlink($_FILES['file']['tmp_name']); } else die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}'); } else die('{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to move uploaded file."}, "id" : "id"}'); } else { // Open temp file $out = fopen($targetDir . DIRECTORY_SEPARATOR . $fileName, $chunk == 0 ? "wb" : "ab"); if ($out) { // Read binary input stream and append it to temp file $in = fopen("php://input", "rb"); if ($in) { while ($buff = fread($in, 4096)){ fwrite($out, $buff); } } else die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}'); fclose($out); } else die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}'); } //Moves the file from $targetDir to $finalDir after receiving the final chunk if($chunk == ($chunks-1)){ rename($targetDir . DIRECTORY_SEPARATOR . $fileName, $finalDir . DIRECTORY_SEPARATOR . $fileName); } // Return JSON-RPC response die('{"jsonrpc" : "2.0", "result" : null, "id" : "id"}'); ?>

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