Recent questions tagged C++

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c++ - OpenCV Neural Network Sigmoid Output

I have been using OpenCV for a quite time. I decided to check its power for Machine Learning lately. So I ... first 20 class for my dataset. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Building glew on windows with mingw32

It is a duplicate and I am sorry about it but I don't have any other options because I can't make ... commenting. Hope you help. Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to find euclidean distance between keypoints of a single image in opencv

I want to get a distance vector d for each key point in the image. The distance vector should consist of ... that can make my task easy? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Boost.Asio: Is it a good thing to use a `io_service` per connection/socket?

I want to create an application that implements one-thread-per-connection model. But each connection must be stoppable. I ... 1; } return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Counting Rooms While Knowing Where Walls Are

This question is on code for C++ builder 6. The bounty is interested in a standard C++ algorithm to solve the ... "+IntToStr(b1[411]) ); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Align profile face image with its frontal face image

I have a profile face: and a frontal face image: Output: aligned profile face with reference to frontal face. Idea ... ) (I get error message) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Calling a function in an injected DLL?

Using C++, I have an application which creates a remote process and injects a DLL into it. Is there a ... from doing anything within DllMain. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Receiving a part of packet via recvfrom (UDP)

I'm trying to receive a part of a packet via recvfrom. It actually works like this: recvfrom(sockfd, ... why it might be happening? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Macro recursive expansion to a sequence

Is it possible to define a C/C++ macro "BUILD(a, i)" which expands to "x[0], x[1], x[2] ... So unfortunately, I cannot use varargs or templates. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Finite State Machine parser

I would like to parse a self-designed file format with a FSM-like parser in C++ (this is a teach-myself-c+ ... per item). Thanks for any input. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Opengl linux undefined reference to basic functions

I wrote a program on Ubuntu 11.04 that uses freeglut. It worked fine. Then I got another computer and tried to ... is the cause of the problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Capture audio of a single application on Windows 7

Is there a way to capture the audio outputted by only a single application, and not the system as a whole? With ... all playing audio at once.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - error LNK2019: unresolved external symbol "public:

I am creating an torrent application using libtorrent in VS 2008. I tried the example given in the link ... LNK1120: 7 unresolved externals See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - popen() writes output of command executed to cout

I am writing an application that needs to open another process and get its output. Everywhere I've read online ... the output for error cases. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to see if a subfile of a directory has changed

In Windows, is there an easy way to tell if a folder has a subfile that has changed? I verified, and the ... set, but the folders will not. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - checking if a class inherits from any template instantiation of a template

I have written a small utility for testing whether or not a type has inherited some template instantiation of a ... issues with the code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - In-Proc COM object sharing across another Process

Before I ask this question I would like to make it clear that I know there are libraries and techniques for ... process B? Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Using GLM's UnProject

I'm not sure how to use the Unproject method provided by GLM. Specifically, in what format is the viewport ... a projection and world matrix? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Does a pointer returned by std::string.c_str() or std::string.data() have to be freed?

As far as i know, std::string creates a ident array-copy of its content when you call the c_str()/data( ... when it comes to memory allocation. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Modern OpenGL: VBO, GLM and Matrix Stacks

After searching and reading about Modern OpenGL in order to upgrade my existing project, I'm a bit confused, since my 3D ... 0.1 > Draw Mesh 3 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - what does this mean char (*(*a[4])())[5]?

Hi I came across the question in "Test your skills in c++". Please let me know what does it mean with an example? Edited ... (*(*a[4])())[5] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to write a wrapper over functions and member functions that executes some code before and after the wrapped function?

I'm trying to write some wrapper class or function that allows me to execute some code before and after the ... in the right direction? Cheers! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Win32 API stack walk with MinGW/MSYS?

i've to develop a stack trace walk to our win32 API plattform support to catch any exception with a behaviour ... hint. Best regards, Christian See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is an event loop in Qt?

I have understood the following regarding QApplication's exec function: QApplication exec starts the main event loop. ... and slots is written? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - c++0x: overloading on lambda arity

I'm trying to create a function which can be called with a lambda that takes either 0, 1 or 2 arguments. Since I need ... < "test" << endl;}); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Strict pointer aliasing: is access through a 'volatile' pointer/reference a solution?

On the heels of a specific problem, a self-answer and comments to it, I'd like to understand if it is a proper ... problem at least on GCC 4.5. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Biased Random Number Generator

I am looking for a random number generator that can be biased. For instance, say I want a random number between ... way to do this myself? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - index or position in std::set

I have a std::set of std::string. I need the "index" or "position" of each string in the set, is this a ... I convert an iterator to a number?". See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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