binaryfiles

问题 I am implementing the huffman algorithm in C. I have got the basic functionality down up to the point where the binary codewords are obtained. so for example, abcd will be 100011000 or something similar. now the question is how do you write this code in binary form in the compressed file. I mean if I write it normally each 1 and 0 will be one character so there is no compression. I need to write those 1s and 0s in their bit form. is that possible in C. if so how? 回答1: Collect bits until you

问题 I'm new using CXF and Spring to make RESTful webservices. This is my problem: I want to create a service that produces "any" kind of file(can be image,document,txt or even pdf), and also a XML. So far I got this code: @Path("/download/") @GET @Produces({"application/*"}) public CustomXML getFile() throws Exception; I don't know exactly where to begin so please be patient. EDIT: Complete code of Bryant Luk(thanks!) @Path("/download/") @GET public javax.ws.rs.core.Response getFile() throws

问题 I am having a fortran code to generate a grid in binary VTK format. This code produces a binary VTK file like this one: # vtk DataFile Version 3.0 vtk output BINARY DATASET RECTILINEAR_GRID DIMENSIONS 2 2 1 X_COORDINATES 2 float ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ Y_COORDINATES 2 float ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ Z_COORDINATES 1 float ^@^@^@^@^@^@^@^@ When, I try to open it with ParaView it crashes with the following error message: ERROR: In /home/user/OpenFOAM/ThirdParty-2.3.0/ParaView-4.1

问题 I have a binary file with a known format/structure. How do I read all the binary data in to an array of the structure? Something like (in pseudo code) bytes = read_file(filename) struct = {'int','int','float','byte[255]'} data = read_as_struct(bytes, struct) data[1] >>> 10,11,10.1,Arr[255] EDIT: Solution so far: data = [] fmt = '=iiiii256i' fmt_s = '=iiiii' fmt_spec = '256i' struct_size = struct.calcsize(fmt) for i in range(struct_size, len(bytes)-struct_size, struct_size): dat1= list(struct

问题 Basically, I need to write a hex dump utility using C++. It'll look something like this (Part of a Word document's hex dump using Visual Studio) I want to prompt the user for a file name, and then display the hexadecimal values as well as the translated ASCII characters. I'm still new at working with binary files, so if you could keep it simple, that would be much appreciated. 回答1: I don't normally do this for your kind of question.... But it doesn't take much to knock something like this up,

问题 Suppose I'm a primarily Linux user, but I'm developing an application in Go that I want to be cross platform. I've searched around, but I can't seem to find information to absolve the following: If I go install a binary on my amd64 Ubuntu system, will it also work on anyone else's 64-bit Ubuntu/Debian system? How can I use go install to build an x86_64 binary that will also run out-of-the-box on 32-bit Debianlikes? If I must use Windows to make a binary which will run on Windows, how can I

问题 There are a few mercurial extensions for dealing with large binary files. Bfiles BigFiles Snap kbfiles others? I'd like to use the one that is most likely to be official (ie distributed with mercurial). Kiln 2.0 uses a fork of Bfiles for its binary files. Does that make it more likely to become official? Which is the preferred (semi-official) extension for handling binary files? 回答1: It appears that Mercurial is planning to incorporate the 'largefiles' extension for the November 2.0 release.

问题 I'd like to know if anyone tried new .NET 4.0 Memory Mapped Files features? I know that they are as old as OS but native handling in .NET is new. Has anyone been able to test this and say something about performance? I'm quite interested in access time to random parts of binary file, write speed and so on. Also performance comparsion to native WinAPI MMF would be nice. Thanks! 回答1: Memory mapped files in .NET 4.0 (in the new System.IO.MemoryMappedFiles namespace) simply wrap the Win32 API for

问题 I am trying to package my project code into a an executable binary using Cython and PyInstaller libraries. My code directory looks like this: The main.py is the main code which imports the logic from program_a.py and program_b.py . I am successfully able to convert my program_a and program_b files into .so files which can be imported by any python code. I did this by executing the following script. from distutils.core import setup from Cython.Build import cythonize sourcefiles = ['program_a

问题 I really like how .NET implements reading/writing of binary data to a file. Clean and elegant. Can I do this in Python? Sub Main() Using writer As New System.IO.BinaryWriter( _ System.IO.File.Open("Test.bin", IO.FileMode.Create)) writer.Write(True) writer.Write(123) writer.Write(123.456) writer.Write(987.654D) writer.Write("Test string.") End Using Using reader As New System.IO.BinaryReader( _ System.IO.File.Open("Test.bin", IO.FileMode.Open)) Console.WriteLine(reader.ReadBoolean()) Console