I am struggeling a little bit with some options for linking on a project I am currently working on: I am trying to create a shared library which is linked against 2 other libraries. (Lets call them libfoo.so and libbar.so) My output library has to be a shared library and I want to static link libfoo.so to the resulting library, but libb...
I have a StartComObjects function called when the user presses the Login button and a StopComObjects function called when the user presses the Cancel button. The StartComObjects function uses CComPtr.CoCreateInstance to create the COM object and sets up some connection points using AfxConnectionAdvise. When the user presses the Cancel ...
Hi.. I'm developing a dll in visual-c++ for client side application to connect my pc to my android phone via bluetooth. I use this function to find my bluetooth service on the phone(see commented code!): bool BlueRayXVR::findPairedService(GUID* guid, _SOCKET_ADDRESS* ret){ this->checkStartup(); HBLUETOOTH_DEVICE_FIND found_dev...
I'm seeing what I believe to be an erroneous/incorrect compiler error using the Visual Studio 2010 compiler. I'm in the process of up-porting our codebase from Visual Studio 2005 and I ran across a construct that was building correctly before but now generates a C2248 compiler error. Obviously, the code snippet below has been generic-i...
I know constructors don't "return" anything but for instance if I call CMyClass *object = new CMyClass() is there any way to make object to be NULL if the constructor fails? In my case I have some images that have to be loaded and if the file reading fails I'd like it to return null. Is there any way to do that? Thanks in advance. ...
I'm writing a class that holds a pointer to a parent object of the same type (think Qt's QObject system). Each object has one parent, and the parent should not be destroyed when a child is destroyed (obviously). class MyClass { public: MyClass(const MyClass* ptr_parent): parent(parent){}; ~MyClass(){ delete[] a_children; }; priv...
I have written a proxy server for Linux using Poco but have since been reading up on the various approaches to achieving TCP/IP server scalability. I will need the server to handle persistent connections (not HTTP traffic) with an upper limit of about 250 simultaneous connections. Each connection typically uses about 5-10Kb/sec and the b...
In writing Win32 C++ code, I'd appreciate some hints on how to handle errors of Win32 APIs. In particular, in case of a failure of a Win32 function call (e.g. MapViewOfFile), is it better to: use AtlThrowLastWin32 define a Win32Exception class derived from std::exception, with an added HRESULT data member to store the HRESULT correspo...
Hi, I'm trying to insert a timestamp (hour:min:sec) into a two-byte array and i'm a little confused on how to accomplish this...any help is greatly appreciated! int Hour = CTime::GetCurrentTime().GetHour(); int Minute = CTime::GetCurrentTime().GetMinute(); int Second = CTime::GetCurrentTime().GetSecond(); BYTE arry[2]; //Need ...
Hi everybody, I am little new to MAC os but while building an cpp application on MAC OS X , using g++ I am getting strange error from linker. first at one step I am creating a library using several object files generated from cpp source and then I am creating a single archive using ar rvs command. If I am linking this library to anot...
Could someone explain to me why adding a virtual function to the end of a class declaration avoids binary incompatibility? If I have: class A { public: virtual ~A(); virtual void someFuncA() = 0; virtual void someFuncB() = 0; virtual void other1() = 0; private: int someVal; }; And later modify this class decl...
I am considering building an app in C++ that will be parsing text from the web and create some statistical results. These results I want to be fed in an external app in real time. The external app (to whose code I have no access, but can ask for a - paid - custom made addition) will then need some code to read and use these results. I a...
Implementing a custom VM and I've come to use registers (these will store pointers and will be NULL when empty). But, I've come to realize that I actually have no idea how to manage register-based memory. Like, what do I do if all my registers are used up and some code wants another? Preferably, without just creating a new one. This is i...
Hi, Let's say we have a class called A and another one called B. and we want to have a conversion method that converts A to B. In the software architecture point of view, which one is preferred? write A.export() write B.import() write a converter class, i.e. convert(A, B) or Convert(A) or ... if the language matters, I'm using C++ ...
I've found myself coming across a lot of reasonably large, complicated codebases at work recently which I've been asked to either review or refactor or both. This can be extremely time consuming when the code is highly concurrent, makes heavy use of templates (particularly static polymorphism) and has logic that depends on callbacks/sig...
I have an arbitrary STL container C, which contains elements of an arbitrary type T. I want to create an std::vector that has a copy of all the elements. What is the cleanest way to do this? template <typename C> void myfunction(C container){ /*Derive the type T of elements within the container*/ std::vector<T> mystack; ...
I have a couple of methods declared at the namespace level within a header for a class: // MyClass.h namespace network { int Method1(double d); int Method2(double d); class MyClass { //... } } then defined in //MyClass.cpp int Method1(double d) { ... } int Method2(double d) { ... } This project compiles cleanly and is a de...
I want to do some funky things with controlling MIDI streams, and I'd like to be able to pipe MIDI input into an application like Ableton or Reason. Presumably this involves some sort of driver level work? Ultimately I'd like to write my application in Python, so if there is some Python-based solution, I'd consider it. I'm perfectly fi...
When I call a method that takes a reference, g++ complains that I'm not passing a reference. I thought that the caller didn't have to do anything different for PBR. Here's the offending code: //method definition void addVertexInfo(VertexInfo &vi){vertexInstances.push_back(vi);} //method call: sharedVertices[index]->addVertexInfo(Ver...
Hello, I have the project getting using DTE with C++: pSolution->get_Projects(&pProjects); CComPtr<EnvDTE::Project> pProject; pProjects->get_Items(1, &pProject); Then I need to add reference to this project. How to do that? As far as I know VsLangProj namespace is not accessible for C++ code. Thanks ...