Hello, I have the following problem. I have a C++ dll, containing the function void cpp_send (void *data_, size_t size_, free_fn *ffn_) { //sends data } then I have C# dll that has a class public class CS_dll : IDisposable { void cs_send (void *data) { IntPtr ptr = Marshal.AllocHGlobal (data.Length); Marshal...
Need prettier solution of below example but with std::accumulate. #include <algorithm> #include <vector> #include <iostream> class Object { public: Object( double a, double b ): a_( a ), b_( b ) {} double GetA() const { return a_; } double GetB() const { return b_; } // other methods private: do...
I want to create an adjacency matrix for a graph. Since I read it is not safe to use arrays of the form matrix[x][y] because they don't check for range, I decided to use the vector template class of the stl. All I need to store in the matrix are boolean values. So my question is, if using std::vector<std::vector<bool>* >* produces too mu...
For a debugging and logging library, I want to be able to find, at runtime, a list of all of the source files that the project has compiled and linked. I assume I'll be including some kind of header in each source file, and the preprocessor __FILE__ macro can give me a character constant for that file, so I just need to somehow "broadcas...
Thus far i have only used glDrawArrays and would like to move over to using an index buffer and indexed triangles. I am drawing a somewhat complicated object with texture coords, normals and vertex coords. All this data is gathered into a single interleaved vertex buffer and drawn using calls similar to ( Assuming all the serup is done c...
It is a university task in my group to write a compiler of C-like language. Of course I am going to implement a small part of our beloved C++. The exact task is absolutely stupid, and the lecturer told us it need to be self-compilable (should be able to compile itself) - so, he meant not to use libraries such as Boost and STL. He also do...
I have a simple WinCE network application (in C, Win32 APIs). I find that networking doesn't seem to work unless I launch IE (or another network app) first. I assume that IE is setting up my network interface in some way. How can I do this for myself? Might I need to display a list of available interfaces to the user (eg. WiFi/Ethernet...
Does someone know of a book or tutorial explaining Qt for Delphi / C++ Builder / VCL developers? What would be the best approach for a developer with that background to learn Qt? I'm particulary interested in how to accomplish things that I know how to do in Delphi with Qt. For example, what is the Qt equivalent to Delphi Frames? What...
Is it possible to create macros to replace all forms of operator new with overloads that include additional args...say __FILE__ and __LINE__? The trouble appears to be that operator new can either be coded with or without parentheses, therefore: object-like macros: #define new new(__FILE__, __LINE__) will replace declarations like:...
I have an application written in C++ and MFC which is multithreaded running on windows. Occasionally I do get some complaints such as deadlocks or an unhandled exception which is caused because of these threads. Normally I use visual studio (if the problem is reproducible) or else use the WinDbg to analyse the dump files generated. Is th...
If 'Test' is an ordinary class, is there any difference between: Test* test = new Test; //and Test* test = new Test(); ...
I tried three iterations of the following simple program. This is a highly simplified attempt to write a container-and-iterator pair of classes, but I was running into issues with incomplete types (forward declarations). I discovered that this was in fact possible once I templatized everything - but only if I actually used the template...
I need to detect if my addin is in PowerPoint 2007 via my C++ addin. The PowerPoint object model exposes Application.Version, which should work, but I do not know enough about how to use this with IDispatch. How to detect PowerPoint 2007 from a C++ addin? ...
Are these the same: int foo(bar* p) { return p->someInt(); } and int foo(bar& r) { return r.someInt(); } Ignore the null pointer potential. Are these two functions functionally identical no matter if someInt is virtual or if they are passed a bar or a subclass of bar? Does this slice anything: bar& ref = *ptr_to_bar; -cory ...
I have a C++ MFC application that uses DPtoLP to calculate logical coordinates from device coordinates. Normally this works fine. I have a screen with square pixels. It is 1280x1024. My VMware runs W2K, with a resolution set to 800x480. In the program the MapMode is MM_LOMETRIC. My OnDraw code: void CMyView::OnDraw(CDC* pDC) { // TE...
Hi All, I have a very simple question. I am trying to rotate a vector around a certain point on the vector(in C++): 1 2 3 4 5 6 7 8 9 rotated around the point (1,1) (which is the "5") 90 degrees would result in: 7 4 1 8 5 2 9 6 3 Right now I am using: x = (x * cos(90)) - (y * sin(90)) y =(y * cos(90)) + (x * sin(90)) But I do...
I have a problem running a simple Hello-world program in C++ on my Windows XP. I have written a post here: Using the g++ C++ compiler from cygwin where I stated the problem and I received many helpful replies, which solved some things. However, I still cannot run my hello-world program. Please, have a look at the post, I have inclu...
There is a try-catch thing about functions, which I think sometimes may be quite useful: bool function() try { //do something } catch(exception_type & t) { //do something } So the first part of the question: is this style considered bad in general case? And the concrete example I used this approach in: We had project with q...
I am trying to create an array of pointers. These pointers will point to a Student object that I created. How do I do it? What I have now is: Student * db = new Student[5]; But each element in that array is the student object, not a pointer to the student object. Thanks. ...
I need to only run ship build and I need to assert on certain condition in release build to see if the problem is fixed. How do I do it? ...