Is there a side effect in doing this: C code: struct foo { int k; }; int ret_foo(const struct foo* f){ return f.k; } C++ code: class bar : public foo { int my_bar() { return ret_foo( (foo)this ); } }; There's an extern "C" around the C++ code and each code is inside its on compilation unit. Is this p...
I have defined an interface in c++, i.e. a class containing only pure virtual functions. I want to explicitly forbid users of the interface to delete the object through a pointer to the interface, so I declared a protected and non-virtual destructor for the interface, something like: class ITest{ public: virtual void doSomething() ...
Hi all, I am writing a program which has two panes (via CSplitter), however I am having problems figuring out out to resize the controls in each frame. For simplicity, can someone tell me how I would do it for a basic frame with a single CEdit control? Fairly sure it is to do with the CEdit::OnSize() funcion... but not really getting ...
I have come to realize that Windbg is a very powerful debugger for the Windows platform & I learn something new about it once in a while. Can fellow Windbg users share some of their mad skills? ps: I am not looking for a nifty command, those can be found in the documentation. How about sharing tips on doing something that one couldn't o...
We are running part of our app as a windows service and it needs to b able to access DSNs in order to import through ODBC. However there seem to be a lot of restrictions found through trial and error on what DSNs it can access. For example it seems that it cannot 1. access a system DSN unless the account that is running the service ha...
If I create an event using CreateEvent in Windows, how can I check if that event is signaled or not using the debugger in Visual Studio? CreateEvent returns back a Handle, which doesn't give me access to much information. Before I call WaitForSingleObject(...), I want to check to see if the event is signaled before I step into the func...
I have an application which behaves as a slideshow for all pictures in a folder. It is written in Borland's C++ Builder (9). It currently uses some borrowed code to throw the filenames into a listbox and save the listbox items as a text file. I want to update this so that the filenames are stored in a proper database so that I can incl...
Most people say never throw an exception out of a destructor - doing so results in undefined behavior. Stroustrup makes the point that "the vector destructor explicitly invokes the destructor for every element. This implies that if an element destructor throws, the vector destruction fails... There is really no good way to protect agains...
I have an Open Source app and I currently only post the binary for the Windows build. At this point Linux users have to get the source and compile it. Is there a standard way for posting a Linux binary? My app is in c / c++ and compiled with gcc, the only external Linux code I use is X Windows and CUPS. ...
I have a server that sends data via a socket, the data is a wav 'file'. I can easily write the data to disk and then play it in WMP, but I have no idea how I can play it as I read it from the socket. Is it possible? Bonus question: how would I do it if the stream was in mp3 or other format? This is for windows in native C++. ...
I am trying to pass a member function within a class to a function that takes a member function class pointer. The problem I am having is that I am not sure how to properly do this within the class using the this pointer. Does anyone have suggestions? Here is a copy of the class that is passing the member function: class testMenu : p...
I have a command line executable that alters some bits in a file that i want to use from my program. Is it possible to create my own executable that uses this tool and distribute only one executable? [edit] Clarification: The command line tool takes an offset and some bits and changes the bits at this offset in a given file. So I want ...
I would like to create data visualizations in desktop apps, using frameworks, languages and libraries that help with this kind of task. Visualizations should be interactive: clickable, draggable, customizable, animated... What I would like to create is something similar to the examples seen here: http://www.visualcomplexity.com/vc/ Th...
Is it at the state where it is actually useful and can do more than rename classes? ...
Take the following two lines of code: for (int i = 0; i < some_vector.size(); i++) { //do stuff } And this: for (some_iterator = some_vector.begin(); some_iterator != some_vector.end(); some_iterator++) { //do stuff } I'm told that the second way is preferred. Why exactly is this? ...
What does it take to get C++ tr1 members (shared_ptr especially, but we'd like function and bind and ALL the others) working with GCC 3.4.4 (for the Nokia N810 tablet computer). Has anyone done this? Attempted this? It may not be feasible for us to upgrade to GCC 4.x to cross-compile for this device (but if you've done that, we'd ...
I have been coding exclusively for a while now on Linux with C++. In my current job, it's a Windows shop with C# as main language. I've retrained myself to use Visual Studio instead of emacs ( main reason is the integrated debugger in VC, emacs mode in VC helps ), setup Cygwin ( since I cannot live without a shell ) and pickup the ropes ...
I notice that modern C and C++ code seems to use size_t instead of int/unsigned int pretty much everywhere - from parameters for C string functions to the STL. I am curious as to the reason for this and the benefits it brings. ...
How can I send an email from C++? Is there a good cross-platform (MS Windows, Linux etc) library that I can use? I'm using GCC (cygwin on MS Windows). ...
Please help! I'm really at my wits' end. My program is a little personal notes manager (google for "cintanotes"). On some computers (and of course I own none of them) it crashes with an unhandled exception just after start. Nothing special about these computers could be said, except that they tend to have AMD CPUs. Environment: Windows...