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• How do you measure the effect of branch misprediction?

  - by Matt Wamboldt

  I'm currently profiling an implementation of binary search. Using some special instructions to measure this I noticed that the code has about a 20% misprediction rate. I'm curious if there is any way to check how many cycles I'm potentially losing due to this. It's a MIPS based architecture.

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• Boost Serialization Library upgrade

  - by Konstantin

  Hello! How do I know that I can safely upgrade Boost Serialization Library on a production system without breaking compatibility with the existing data ? Is there any test that I should perform in order to be sure that all data stored in the binary format by previous version of the library will be successfully read by the new one ? Does Boost Serialization library itself guarantee some sort of compatibility between versions ?

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• Hash Table v/s STL map in C++

  - by anon

  Hi, I am trying to learn C++ maps. Was just wondering about the implementation of STL map. I read it employs Binary search tree. Is there a implementation of hash table in STL? How exactly do STL map stores Key Value pairs?

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• C++ [] array operator with multiple arguments?

  - by genesys

  Can I define in C++ an array operator that takes multiple arguments? I tried it like this: const T& operator[](const int i, const int j, const int k) const{ return m_cells[k*m_resSqr+j*m_res+i]; } T& operator[](const int i, const int j, const int k){ return m_cells[k*m_resSqr+j*m_res+i]; } But I'm getting this error: error C2804 binary operator '[' has too many parameters

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• Do iphone push notifications send the actual sound data to play, just a filename, or is it handled b

  - by SLC

  And, does it cache it locally? I ask because I am wondering if it's possible to change the sound of a push notification via SSH, replacing an app sound. My question is specifically about how the API for push notifications works. Does it send a .caf (aiff) binary file for the phone to play each time?

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• Resources and tutorials to get started on algorithms

  - by koldfyre

  I'm interested in learning about algorithms, both conceptually and practically, as a beginner. I want to learn about binary search trees and similar. What tutorials and example programs, preferably in Python or Java, will help me?

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• File upload-download in its actual format.

  - by ras

  hi, I've to make a code to upload/download a file on remote machine. But when i upload the file new line is not saved as well as it automatically inserts some binary characters. Also I'm not able to save the file in its actual format, I've to save it as "filename.ser". I'm using serialization-deserialization concept of java. Thanks in advance.

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• Serializing and Deserializing External Assembly in C#

  - by Heka

  I wrote a plugin system and I want to save/load their properties so that if the program is restarted they can continue working. I use binary serialization. The problem is they can be serialized but not deserialized. During the deserialization "Unable to find assembly" exception is thrown. How can I restore serialized data?

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• Switching MySql Replication Format

  - by NNN

  I'm currently using statement-based replication. After upgrading to MySql 5.1, I'm considering using row-based replication. After reading the docs it seems that you can change the format of the master on the fly. Will the slave automatically adapt to whatever type of binary log it is sent? Do I have to make any changes to the slave or master to get ready for switching or can I simply modify the binlog_format variable on the master?

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• What does an object file contain

  - by benjamin button

  HI everyone, during the various stages of compilation in C or C++, i know that an object file gets generated. i.e., any_name.o file. what does thos .o file contain actually. i cant open it since its a binary file. Could anybody please help me? are the contents of the object file mainly Dependant on the compiler which we use on unix?

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• Sharing serial port (Modem protocol + dialer)

  - by debita

  Hi, I wanted to use this code to send archives with Xmodem: http://www.java2s.com/Code/Java/Network-Protocol/JModemsimplecommunicationsprogram.htm In this case, I want to establish a dialup connection between two computers and send a binary file. But this code doesn't let me set a phone number to dial after i setup the port and before I transfer the file. Is there any way of sharing the port with another application that dials the phone number?

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• is it necessary to set up all banking account info in the iphone dev account before submitting a pa

  - by user171389

  Hi guys, I just wanted to know if its necessary to set up all the banking info before proceeding with submission of the actual paid app for the binary. Thanks and Regards, Harikant Jammi

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• displaying jpg image via jquery ajax call

  - by Sobek

  Hi, I want to show images that are requested from a binary field (blob) out of a mysql database. They are retrieved by a PHP script and outputs a 'real' jpeg image i.e. header('Content-Type') = 'image/jpeg'. This is working. But how can i intercept this image that is being made by an ajax call ?

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• Direct boost serialization to char array

  - by scooterman

  Hi all, Boost serialization doc's assert that the way to serialize/deserialize items is using a binary/text archive with a stream on the underlying structure. This works fine if I wan't to use the serialized data as an std::string, but my intention is to convert it directly to a char* buffer. How can I achieve this without creating a temporary string?

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• What API to use for uploading images to a Rails based website from an iPhone application?

  - by wgpubs

  Looking at using either ObjectiveResource or ASIHTTPRequest ... Which is superior for uploading images? Or is there a better option??? Are there any examples of using either or both to upload images (or any other binary content)? Thanks

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• value of c define changes unexpectedly

  - by NomeN

  I have a lot of #define's in my code. Now a weird problem has crept up. I have this: #define _ImmSign 010100 (I'm trying to simulate a binary number) Obviously, I expect the number to become 10100. But when I use the number it has changed into 4160. What is happening here? And how do I stop it?

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• C# save a file from a HTTP Request

  - by d1k_is

  Im trying to download and save a file from a HttpWebResponse but im having problems saving the file (other than Text Files) properly. I think its something to do with this part: byte[] byteArray = Encoding.UTF8.GetBytes(http.Response.Content); MemoryStream stream = new MemoryStream(byteArray); Text Files work fine with the above code but when I try to save the Content to an Image file it gets corrupted. How do i write this 'string' data to an image file (and other binary files)

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• "unadd" a file to svn before commit

  - by Lowgain

  I was in the middle of doing a recursive svn add/commit, and a folder which did not have the proper ignore properties was included. I've got about 100 uploaded binary files versioned now, but I haven't committed yet. What is the easiest way to 'undo' this, without deleting all the documents? Thanks!

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• How do you open a file in C++?

  - by superjoe30

  I want to open a file for reading, the C++ way. I need to be able to do it for text files, which would involve some sort of read line function, and a way to do it for binary files, which would provide a way to read raw data into a char* buffer.

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• number of search accesses

  - by Phenom

  How do you calculate number of accesses for a sequential search if record is present, not present, or sometimes present? What about for binary search?

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• Where can I download the newest Castle.Facilities.ActiveRecordIntegration.dll?

  - by ripper234

  It's needed, but it's not obvious from the Castle homepage where this file sits. I am looking for a binary release, not source code.

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• general...................................................

  - by kshitija

  i want 2 know vry basic concepts of computer sys,hv bit knowledge only.. Q : when we enter data through keyboard then how it is exactly gt stored?... in binary ?or in a ascii?

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• Is there a way to inspect the current rpath on Linux?

  - by Justicle

  I'm aware that it is possible to use 'readelf -d | grep RPATH' to inspect a given binary from the shell, but is it possible to do this within a process? Something like (my completely made up system call): /* get a copy of current rpath into buffer */ sys_get_current_rpath(&buffer); I'm trying to diagnose some suspect SO linking issues in our codebase, and would like to inspect the RPATH this way if possible (I'd rather not have to spawn an external script).

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• Rails: How to to download a file from a http and save it into database

  - by Chris

  Hi, i would like to create a Rails controller that download a serie of jpg files from the web and directly write them into database as binary (I am not trying to do an upload form) Any clue on the way to do that ? Thank you Edit : Here is some code I already wrote using attachment-fu gem : http = Net::HTTP.new('awebsite', 443) http.use_ssl = true http.verify_mode = OpenSSL::SSL::VERIFY_NONE http.start() { |http| req = Net::HTTP::Get.new("image.jpg") req.basic_auth login, password response = http.request(req) attachment = Attachment.new(:uploaded_data => response.body) attachement.save } And I get an "undefined method `content_type' for #" error

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• Converting different registry value types to string?

  - by Tom

  Hi, im traversing through the registry, taking the values of the keys and storing them as strings. I have discovered there are many different types. Some of these types are causing my filestream writer to fail. Is it possible to convert all of the below into a string form. The actual data value is not important, just the ability to differentiate between different values. DWORD ExpandString Binary (is this just the same as byte[] ?) MultiString

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