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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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  • Using many mutex locks

    - by hanno
    I have a large tree structure on which several threads are working at the same time. Ideally, I would like to have an individual mutex lock for each cell. I looked at the definition of pthread_mutex_t in bits/pthreadtypes.h and it is fairly short, so the memory usage should not be an issue in my case. However, is there any performance penalty when using many (let's say a few thousand) different pthread_mutex_ts for only 8 threads?

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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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  • How do machine code instructions get transferred to the CPU?

    - by user3711789
    I'm currently investigating what the runtime of different programming languages looks like behind the scenes. For a compiled language like C, people usually give the explanation of "Code is compiled to assembly which is assembled and linked into a binary executable. The executable is then loaded into memory and the CPU interprets it." My question is how does the CPU know where to look for the next instruction to execute? Is it a memory address stored in one of the registers?

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  • Create select based on routing, how?

    - by huug
    I am trying to implement navigation like in Tree Based Navigation but based on url's defined in routes.rb (named routes, resources, ...). Is it possible to retreive a collection of all routes defined in routes.rb? So I can use it in a select like this: <%= f.collection_select :url, Route.all, :url, :name %> Tnx!

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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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  • 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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  • 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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  • Are there IDEs in which the code-completion widget is not a linear list?

    - by Uri
    Most mainstream IDEs use code-completion in the form of a linear list of suggestions (typically methods). Are there any IDEs (mainstream or not) or IDE plugins that use a non-linear widget, such as a tree? (e.g., pick category first, then the actual recommendation)? I'm working on an IDE feature and want to make sure I'm not reinventing the wheel or infringing some patent.

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  • Notepad++ replacement

    - by bah
    Hi, I've been using notepad++ for a while now, but i noticed it doesn't have code snippets (i found quicktext plugin, but it doesn't work anymore), so i'd like to switch editor and my requirements would be: Fast startup. Code snippets. Ability to use themes. File tree view (or plugin, which does that). What are you using? Thank you all for suggestions!

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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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  • 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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  • 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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  • 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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  • Including some static html files?

    - by user246114
    Hi, Where can we place static html files in our war file? For example, a default project has this: war/projectname.html I'd like to just make a few static folders with static pages that are like: war/projectname.html war/signup/index.html war/about/index.html so that my users can just hit those static pages like: www.myproject.com/signup www.myproject.com/about where would I put folders like that in our project tree? I tried putting them under war/, just beside projectname.html (like above), but they don't seem to be available there, I just get a 404 error, Thanks

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  • Can AutoCAD entities be serialized?

    - by billmuell
    Using ObjectARX (C++) for AutoCAD 2010, can AutoCAD entities be serialized? We need to save the serialized entity in a field in a database (Oracle, PostgreSQL, etc., not AcDbDatabase). It'OK if you show me how to save them in disk, something like this: AcDbEntity * entity; ... std::ofstream ofs("c:\\filename.fil", std::ios::binary); ofs.write((char *)(entity), sizeof(entity)); ofs.close(); Thanks

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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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  • C# Read Byte [] to Image

    - by LucasGuitar
    I have an application which I'm adding pictures and these are automatically converted to binary and stored in a single file. how can I save several images, I keep in an XML file start and size of each set of refente to an image byte. But it has several images in bytes, whenever I try to select a different set of bytes just opening the same image. I would like your help to be able to fix this and open different images. Code //Add Image private void btAddImage_Click(object sender, RoutedEventArgs e) { OpenFileDialog op = new OpenFileDialog(); op.Title = "Selecione a Imagem"; op.Filter = "All supported graphics|*.jpg;*.jpeg;*.png|" + "JPEG (*.jpg;*.jpeg)|*.jpg;*.jpeg|" + "Portable Network Graphic (*.png)|*.png"; if (op.ShowDialog() == true) { imgPatch.Source = new BitmapImage(new Uri(op.FileName)); txtName.Focus(); } } //Convert Image private void btConvertImage_Click(object sender, RoutedEventArgs e) { if (String.IsNullOrEmpty(txtName.Text)) { txtName.Focus(); MessageBox.Show("Preencha o Nome", "Error"); } else { save(ConvertFileToByteArray(op.FileName), txtName.Text); } } //Image to Byte Array private static byte[] ConvertFileToByteArray(String FilePath) { return File.ReadAllBytes(FilePath); } //Save Binary File and XML File public void save(byte[] img, string nome) { FileStream f; long ini, fin = img.Length; if (!File.Exists("Escudos.bcf")) { f = new FileStream("Escudos.bcf", FileMode.Create); ini = 0; } else { f = new FileStream("Escudos.bcf", FileMode.Append); ini = f.Length + 1; bin = new TestBinarySegment(); } bin.LoadAddSave("Escudos.xml", "Brasileiro", nome, ini, fin); BinaryWriter b = new BinaryWriter(f); b.Write(img); b.Close(); f.Dispose(); } //Load Image from Byte private void btLoad_Click(object sender, RoutedEventArgs e) { getImageFromByte(); } //Byte to Image public void getImageFromByte(int start, int length) { using (FileStream fs = new FileStream("Escudos.bcf", FileMode.Open)) { byte[] iba = new byte[fs.Length+1]; fs.Read(iba, start, length); Image image = new Image(); image.Source = BitmapFrame.Create(fs, BitmapCreateOptions.None, BitmapCacheOption.OnLoad); imgPatch2.Source = image.Source; } }

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