I've been programming PHP & mySQL for about 8 years now. I understand and make use of modern software architectures and OOP in my projects on a daily basis. I decided I want to learn something new. I finally decided yesterday that I want to learn C and eventually Objective-C so I can begin creating Mac / iOS applications. (Would you rec...
Hi need to copy the written objects in a file to copy to a array But following code gives me a Error T Obj T arr[20]; while(file.read((char*)&Obj,sizeof(Obj))){ int i=0; i++ arr[i]==Obj; } Error C2678: binary '==' : no operator found which takes a left-hand operand of type ...
hi, this may be a dumb question or asked many times, i searched for it but did not find a proper answer. What is exactly going on when we type on SQL engine "Create table xxxx" how to implement this one in c++, i mean how it creates a variable dynamicalyy "xxxx" and store the data in it. If i queried "select * from xxxx" how it go to ...
I am try to make the myFunction give me a sum of the values in the array, but I know I can not use a return value, and when I run my program with the code as so all I get is a print out of the values and no sum why is that? void myFunction (int i) { int total = 0; total += i; cout << total; } int main() { int array[] = { 1, 2, 3, 4, 5...
I maintain an open source program that builds with autoconf. Right now I'm having a problem with some of my users. They are using a pre-distributed VM from an organization that has an incorrect prototype for strchr in it. Their prototype is: char *strchr(char *,int c); when of course we know it should be: char *strchr(const char *s...
My project has a bunch of #ifdefs. The macros used by these #ifdefs are usually passed through the command line using the '/D' option to get different build configurations. Visual studio incorrectly assumes that these macros are not defined and greys out the code blocks present inside these #ifdefs. The problem is not syntax highlighting...
When Using DLLs or Code-injecting to be Specific this is an example class only intended for explaining class test { int newint1; char newchararray[512]; void (*newfunction1)( int newarg1 ); int newfunction2( bool newarg1, char newarg2 ) { return newint1; } } mynewclass1; that covers most common elemen...
I am writing a programming language text parser, out of curiosity. Say i want to define an immutable (at runtime) graph of tokens as vertices/nodes. These are naturally of different type - some tokens are keywords, some are identifiers, etc. However they all share the common trait where each token in the graph points to another. This pro...
I am new to OpenGL and Qt, and I am learning both simultaneously(3 days already:). I couple of years ago I did some exmerimenting with DirectX and I clearly remember that it was possible to make a full-screen window there. By full-screen I mean really full-screen, even without the top part where you have the close fullscreen and minimize...
If an ASSERT fires once ExitInstance() has entered, any ASSERT will, I assume, throw a structured exception, thus skipping the rest of the code in ExitInstance(). Can anyone shed a little light on this? ...
I thought that the delete command would free up memory I allocated. Can someone explain why it seems I still have the memory in use after delete? class Test { public: int time; }; int main() { Test *e; e = new Test; e->time = 1; cout << e->time << endl; delete e; e->time = 2; cout << e->time << endl;...
I'm working on a project where a Windows web server running PHP is communicating over a very slow connection with a back end Linux server running an application written in C++. Because the connection between the two machines is so slow, I'd like to compress the traffic moving between them. I've gotten to where I can compress a string, ...
Is it a good idea to do the following in C++: typedef std::map<std::string, boost::any> MyVals; // Is the following typedef'd type inside a map a good idea? typedef std::map<std::string, MyVals> TagValues; These maps will be used a lot for sequential insertion and removal. ...
Here is my problem, I have several parameters that I need to increment by 0.1. But my UI only renders x.x , x.xx, x.xxx for floats so since 0.1f is not really 0.1 but something like 0.10000000149011612 on the long run my ui will render -0.00 and that doesn't make much sense. How to prevent that for all the possible cases of UI. Thank y...
I'm a good programmer, but I have zero network experience. Basically, I'd like to get into client-server networking. For example, I'd like to try getting a server process going which allows clients to connect over the internet and send pings to all of the other connected clients. Then maybe I'll try developing a simple chat client, or s...
<> - read this as a template; I can do this: void f() {} //Here I'm declaring a fnc as a <> param template<void (*fnc)()> struct Factor { }; int main() { Factor<f> fac; return 0; } but I cannot do this: #include <sstream> template<class R, class T> R make_(T first, T second) { std::stringstream interpreter; R resul...
For this program, I've been using the OpenGL-based reni2D library in Visual C++ 2008 Express Edition. The said library is on this webpage: http://www.involuntaryexercise.com/apps/reni2D.zip The problem I get happens when trying to make a brick from the sprite structure. I've been using an array of bricks, but at the moment have restrict...
Hello, I am having a repeating seg fault while using SystemC. During initialization I set a value to 0. During operation of a testbench I am setting this value to 1 in a module (proc). This is a sc_signal variable that is attached to a port of another module imem. The input port is of type sc_in. In theory, this assignment should c...
I have a need to pass in an HRESULT value to a program as a command line argument. I had intended to do so by passing the hex value, e.g.: >receiver.exe 0x80048836 I'm trying to convert this string representation back into an HRESULT using wcstol, eg: HRESULT hr = wcstol(argv[2], NULL, 16); However, the value of the original HRESUL...
I would like to know if its possible to call a non-const member function from a const member function. In the example below First gives a compiler error. I understand why it gives an error, I would like to know if there is a way to work around it. class Foo { const int& First() const { return Second(); } int& Secon...