Recent questions tagged c++

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c++ - Read File line by line to variable and loop

I have a phone.txt like: 09236235965 09236238566 09238434444 09202645965 09236284567 09236235965 ..and so on.. How can I ... to C++. 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++ - Fully transparent OpenGL model

Explain me what i'm doing wrong. I have loaded 3d model to self-coded opengl render (v 3.3) and try ... transparent? How can i implement 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++ - OpenCV's projectPoints function

I'm currently trying to implement a example of OpenCV's projectPoints method. The idea behind this method is ... would be greatly appreciated. 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++ - QtConcurrent with member function

I create a QFuture that I want to use to parallelize calls to a member function. More precisely, I have a ... the trick? Thanks and regards. 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++ - .NET System::String to UTF8-bytes stored in char*

I am wrapping some unmanaged C++ code inside a .NET project. For this I need to convert System::String to ... ); Marshal::FreeHGlobal(pnt); } 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 do plugin systems work?

I'm working on a project where I would find a basic plugin system useful. Essentially, I create the base class ... this type of system? 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 launch non-elevated administrator process from elevated administrator context on Windows 10?

Is there an easy way to create a normal administrator process (not elevated) from an elevated administrator process? I ... does not work at all. 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 get the exit code of program invoked by system call?

For example, Program a.out: int main() { return 0x10; } Program b.out: int main() { if(system("./a.out") ... what's the proper way to do 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++ - Monitoring CPU and disk utilization of a single program

How can I calculate CPU and disk utilization of another concurrent program? I.e. one program is running and ... and running under Windows XP. 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++ - Extern variable at specific address

Using C++ and GCC, can I declare an extern variable that uses a specific address in memory? Something like int key ... , how can I use 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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c++ - C++11 auto, std::function and ambiguous call to overloaded function

I'm wondering if anyone knows why the following sample doesn't compile giving an ambiguous call to overload function error ... (v2); 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++ - Alignment guarantees of static char array

I want to know the alignment guarantees of a statically allocated array of char. Looking at other SO questions, ... can I overcome this 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++ - Is it possible to obtain an intermediate C code from Objective-C?

As I understand correctly, besides the fact that Objective-C language is a strict superset of a "clean" C, ... . Is it generally possible ? 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 do I measure the size of a boost interprocess vector in shared memory?

I'm using boost::interprocess::vector to share some strings between processes, and I want to make sure I do ... ->push_back(shmString); } } 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 does poll keep returning although there is no input?

I wrote a small test program to figure out how to talk to poll. I created three files testa,testb,testc and wrote ... the 3.10-2-amd64 kernel. 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++ - Increasing MAXIMUM_WAIT_OBJECTS for WaitforMultipleObjects

What is the simplest way to wait for more objects than MAXIMUM_WAIT_OBJECTS? MSDN lists this: Create a thread ... thousand handles to threads. 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++ - Installation of OpenCV 2.4.5 on Visual Studio 2008

I'm having some difficulties trying to use OpenCV with visual studio 2008 (Professional Edition). I believe I've ... could easily adapt 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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c++ - The most efficient way of implementing pow() function in floating point

I am trying to implement my own version of pow() and sqrt() function as my custom library doesn't have pow ... point support. Can anyone 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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c++ - C++11 Template function that takes a std::function which depends of template parameters

I am trying to write a template function that accepts a std::function which depends on the template arguments. ... temporary is not needed? 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++ - initialize array size from another array value

#include<iostream> using namespace std; const int vals[] = {0, 1, 2, 3, 4}; int newArray[ vals[2] ]; ... line is removed Why doesn't this work? 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 * Width & Precision Specifiers With boost::format

I am trying to use width and precision specifiers with boost::format, like this: #include <boostformat.hpp> ... using a drop-in replacement? 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 compile gtk+ application for native windows (and not for X windows)?

I have managed to compile a gtk+ application with cygwin, but unfortunately with this approach, the application ... + applications on windows? 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::unique_ptr<> as pointer in a node based structure

Since most of the ppl like puzzles I,ll start this question with a (bad spelling :))gotw like introduction ... im looking for general solution. 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: iostream.h due to including cplex

I am trying to use cplex in eclipse in Ubuntu 12.04 but when I include ilocplex.h I get the following error ... anyone could help me with 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++ - Reading JSON from a socket using boost::asio

I am currently trying to transfer some JSON data over the network from a client to a server using the ... the buffer contains enough data? 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++ - Loading an icon in Windows program

I'm trying to set a custom icon into my program but nothing happens. I created an icon using this tool. I ... defined in Resource.h as 101. 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 the advantage of using dynamic_cast instead of conventional polymorphism?

We can use Polymorphism (inheritance + virtual functions) in order to generalize different types under a ... implemented with dynamic_cast? 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++ - GTest installed with Conan: undefined reference

I tried to use gtest installed through conan, but ended up with an undefined reference linker error. This question is ... :84: all] Error 2 See Question&Answers more detail:os...

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

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