Recent questions tagged C++

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I now how to set value(number) but can i read that label in some variable. if can't read, in which similar ... . Maybe like LCD number, spin box 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++ - Calculate time encryption of AES/CCM in Visual Studio 2017

I am using the library Crypto++ 5.6.5 and Visual Studio 2017. How can I calculate the encryption time for AES-CCM? 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++ - WaitForSingleObject for thread object does not work in DLL unload

I've stumbled upon an unexpected behavior of Windows thread mechanism when DLL is unloaded. A have a pack of ... this behavior can be fixed? 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++ - floating point issue

I have a floating value as 0.1 entering from UI. But, while converting that string to float i am getting ... with this problem. Thanks, iSight 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++ - The correct CMakeLists.txt file to call a MAXON libarary in a Python script using pybind11

I'm very new to the whole CMake. Following this and this posts, now I want to call a MAXON function ... Thanks for your support 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++ - boost serialization of native type defined with typedef contained within struct

I have a MyFile.hpp header file which contains various types and enums. How do i do serialization/ desrialization of ... do i go ahead. 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++ - Line 5: Char 54: error: no matching function for call to 'min(int, std::__cxx11::basic_string<char>::size_type)'

class Solution { public: string reverseStr(string s, int k) { for (int start = 0; start < s.size(); ... std::__cxx11::basic_string::size_type)' 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 create an extension to already wrapped library via SWIG?

I have a library. It is wraped via SWIG. I want to create a plugin to extend it. Plugin requires a ... wrapped when creating binding for plugin? 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++ - QT No such file or dictionary when I try to include a header file

This is a very common issue in QT. Include header files and then get the error. No such file or directory How to ... 5.15.2 and C++11. 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++ - std::thread causes program to abort

I have the following code snippet: #include <thread> int main(){ std::thread trial([](){ return 2;}); ... somebody explain what's going on? 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++ - function pointer to a class member

I am trying to do some like this: class A { void *(*func)(void *); A(void *(*function)(void *)){ ... member in the same class??? Thanks! Carlos 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++ - Why the output image will be rotated?

I build a watermark creator by OpenCV. The program could create watermark in the 4 corner of a source image. I ... of source image as 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++ - Does CMake always generate configurations for all possible project configurations?

I have specific configuration for debug and release options (diferent for MSVC and for GCC). Say we generate ... set of comfiguration options? See Question&Answers more detail:os...

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

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342 views

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c++ - OpenCV - Filter blobs by width and height

I have a image filtered by canny edge detector. Now, i want to detect blobs and do some filter by width and height ... that i have to look at ? 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++ - MSVC++ warning flags

With gcc and clang, I routinely use -Wall -Wextra warning flags. What command line switches for Visual C++ ... of the other compilers catch. See Question&Answers more detail:os...

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

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283 views

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c++ - initialize array with constant number does not work

I get the following error when I use constant nVar instead of a number. constants.h: extern const unsigned ... unqualified-id before 'const' 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++ - Why is the destructor getting called twice but the constructor only once?

My code is class CTemp{ public: CTemp(){ printf(" In cons"); } ~CTemp(){ printf(" In dest"); ... called twice? Can someone please explain this? See Question&Answers more detail:os...

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

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226 views

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c++ - How to handle multi-line rules for gor parsing bnf grammar using boost spirit qi

Assuming I have a BNF grammar like this <code> ::= <letter><digit> | <letter><digit><code> <letter> ::= ... how I am going to handle this. 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++ - attempt to decode a value not in base64 char set

I am using the following code snippet to base64 encode and decode a string using Boost C++ library. //Base64 ... ? Am I missing something here? 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++ - Build OpenCV application with MSVS compiler in VSCode

I'm trying to build my C++ project in VSCode. However, I'm experiencing link issues with OpenCV "error ... I would really appreciate some help. See Question&Answers more detail:os...

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

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289 views

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c++ - Substraction or decrement random access iterator pointing to begin

Consider following piece of code void foo( bool forwad ) { vector<MyObject>::iterator it, end_it; int ... question for more informations. See Question&Answers more detail:os...

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

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834 views

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c++ - Using Eigen Lib in my Cmake project?

I am having difficulty using a header-only library (Eigen) in my CMake project. When i take off all ... COMPONENT Devel ) add_subdirectory(src) 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++ - g++ no matching function call error

I've got a compiler error but I can't figure out why. the .hpp: #ifndef _CGERADE_HPP #define _CGERADE_HPP ... CVektor::CVektor(const CVektor&) 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++ - Example parsing error

I'm trying to parse an example of boost spirit (2.5.2) following the example. My code is the following ... Thanks in advance for your replies. 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 can I Execute a Function when Windows Shut down

How Can I execute a function when Windows shutdown. Here is my scenario, I am mounting a drive using WNetAddConnection2 ... to go ahead with it? See Question&Answers more detail:os...

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

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219 views

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c++ - Generating 3D Cylinder with Rotationmatrix

I am trying to create a cylinder in 3D space. I get a start and endpoint in 3D and to place the ... angle belongs to witch rotation 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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177 views

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c++ - Member must have class/struct/union

I am trying to write a C++ class definition called student.h which will read the grades from the input file defined by ... 0 skipped ========== See Question&Answers more detail:os...

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

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390 views

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c++ - How to use a variable inside a _T wrapper?

I want to make the hostname part of this string to be variable.. Currently, it is only fix to this URL: ... ' : undeclared identifier c:est.cpp See Question&Answers more detail:os...

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

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