Do I still write String^ const in C++/CLI
In C++ it's recommended to have const-correctness everywhere. But since in .Net world, the string content cannot be changed, (new string will be created), do I still write String^ const? ...
c++
Encapsulating user input of data for a class (C++)
For an assignment I've made a simple C++ program that uses a superclass (Student) and two subclasses (CourseStudent and ResearchStudent) to store a list of students and print out their details, with different details shown for the two different types of students (using overriding of the display() method from Student). My question is abo...
What is the correct Qt idiom for exposing signals/slots of contained widgets?
Suppose I have a MyWidget which contains a MySubWidget, e.g. a custom widget that contains a text field or something. I want other classes to be able to connect to signals and slots exposed by the contained MySubWidget instance. Is the conventional way to do this: Expose a pointer to the MySubWidget instance through a subWidget() metho...
Need to skip newline char (\n) from input file
I am reading in a file into an array. It is reading each char, the problem arises in that it also reads a newline in the text file. This is a sudoku board, here is my code for reading in the char: bool loadBoard(Square board[BOARD_SIZE][BOARD_SIZE]) { ifstream ins; if(openFile(ins)){ char c; while(!ins.eof()){ for ...
How get list of local network computers?
Hello. I am trying to get a list of local network computers. I tried to use NetServerEnum and WNetOpenEnum API, but both API return error code 6118 (ERROR_NO_BROWSER_SERVERS_FOUND). Active Directory in the local network is not used. Most odd Windows Explorer shows all local computers without any problems. Are there other ways to get ...
Using Apple autorelease pools without Objective-C
I am developing an application that needs to work on Linux, Windows and Mac OS X. To that purpose, I am using C++ with Qt. For many reasons, on Mac OS X, I need to use CoreFoundation functions (such as CFBundleCopyBundleURL) that creates core objects that need to be released with CFRelease. But doing so generate a lots of these warnings...
HttpAddUrl permissions
I'm trying to run a custom WinHTTP based web-server on Windows Server 2008 machine. I pass "http://*:22222/" to HttpAddUrl When I start my executable as Administrator or LocalSystem everything works fine. However if I try to run it as NetworkService to minimize security risks (since there are no legitimate reasons for the app to use ad...
How can I make a fixed hex editor?
So. Let's say I were to make a hex editor to edit... oh... let's say a .DLL file. How can I edit a .DLL file's hex by using C# or C++? And for the "fixed part", I want to make it so that I can browse from the program for a specific .DLL, have some pre-coded buttons on the programmed file, and when the button is pressed, it will automatic...
how to read character from console in c++?
I'm struggling with reading characters from console in c++. Here is what I tried to do: char x; char y; char z; cout<<"Please enter your string: "; string s; getline(cin,s); istringstream is(s); is>> x >> y >> z; The problem is if the user enter something like this "1 20 100": x will get 1 y will get 2 z will get 0 What I want t...
Converting Cartesian 5D and Angular 2D to Lat Long Alt
Does anyone has the formula to convert X,Y,Z,Vx,Vy(cartesian 5D) as well as Azimuth, Elevation(Angular 2D) to Lat Long Alt? Thanks. ...
SDL doesn't detect Arrow Keys
I am working through the SDL tutorials over at http://lazyfoo.net/SDL_tutorials/index.php and I'm stuck on tutorial 8 where I'm working with key presses. I'm using the following code: //Our Main application loop while(!quit){ if(SDL_PollEvent(&curEvents)){ if(curEvents.type == SDL_QUIT){ quit = true; } ...
Formatted input in c++
hey, i'm a noob to c++ (and coding in general) i'm looking for an easy way to take two doubles (at once) from the keyboard and store them in a struct i've created called "Point" and then ultimately store the Point into a vector of Points that's a member of a class (called "Polygon"). i know i could do it with a scanf but need to know how...
how to check if the OS is Windows or Debian in c++?
I want to clear console screen every time the user make an input in C++. I'm thinking of using system command. For Windows, it is "cls". For Linux, it is "clear". Is there a way check which system to use the appropriate command in c++? Thanks. ...
MemSet & MemCopy
I'm writing a memory allocator, and I need a way to store an integer inside of a chunk of memory. This integer will represent the size of the block so I can navigate to the end given the pointer to the beginning. Here's my test example: // EDIT: Declared space for testInt int* testInt = new int; head_ptr = (char*) malloc(4*1024*1...
Can't start gdb.exe in Qt Creator
I have a project in Qt Creator that builds fine, but when I try to debug it I get this message: Adapter start failed Unable to start gdb 'C:\Qt\2010.02.1\mingw\bin\gdb.exe': Process failed to start: The directory name is invalid If I navigate to the debug build folder and directly run my compiled application, it will run fine, but ob...
Checking if parsed date is within a date range
So I am using a scripting language with c++-like syntax, and I am trying to think of the best way to check if a date is within range. The problem I am running into is that if the current day is in a new month, the check is failing. Here is what my code looks like: if(iMonth >= iStartMonth && iMonth <= iEndMonth) { if(iDay >= iStart...
Reallocating memory via "new" in C++
Quick question regarding memory management in C++ If I do the following operation: pointer = new char [strlen(someinput_input)+1]; And then perform it again, with perhaps a different result being returned from strlen(someinput_input). Does this result in memory being left allocated from the previous "new" statement? IE, is each new ...
Why protected superclass member cannot be accessed in a subclass function when passed as an argument?
I get a compile error, which I'm slightly confused about. This is on VS2003. error C2248: 'A::y' : cannot access protected member declared in class 'A' class A { public: A() : x(0), y(0) {} protected: int x; int y; }; class B : public A { public: B() : A(), z(0) {} B(const A& item) : A(), z(1) { x = item.y;} private: int z...
Which C++ book shold I get between "C++ Primer" vs "C++ Primer Plus"
Possible Duplicate: The Definitive C++ Book Guide and List I want to learn C++ by using Vim and MinGW as compiler. I'm interesting at "C++ Primer (4th Edition)" and "C++ Primer Plus (5th Edition)" but I don't know how about it different. It has no book store that I can review those books, so I want to know, what is the differe...
Mixing policy-based design with CRTP in C++
I'm attempting to write a policy-based host class (i.e., a class that inherits from its template class), with a twist, where the policy class is also templated by the host class, so that it can access its types. One example where this might be useful is where a policy (used like a mixin, really), augments the host class with a polymorphi...