I've got a struct with some members that I want to be able to get and set from a string. Given that C++ doesn't have any introspection I figure I need some creative solution with macros, the stringize operator and maybe boost::bind. I don't need full serialization or introspection, more an 'introspection-lite' I'd like to have somethin...
I would like to be able to get a changed portion of the file from VSS snapshot? How it is possible? ...
I've been trying all night, and talk of maps, arrays, vectors and hash_maps have filled my head. im just confused now. i posted a previous question here: http://stackoverflow.com/questions/1687085/c-map-really-slow problem was fixed but it seems map's are still not fast enough. i need to keep adding data. data is added ALOT during run t...
In MFC, I can edit the text of items in the list control but only for the first column by setting the Edit Labels to true. Now when I click the first column item to change its text, I'm able to change its text but when I hit Enter, its text isn't updated, why and how do I edit text for other columns? ...
Consider an example: void main() { int *arr; arr=new int[10]; } How can I know the size of arr? ...
Hi everyone We have a memory overwrite problem. At some point, during the course of our program, a memory location is being overwritten and causing our program to crash. the problem happens only in release mode. when in debug, all is well. that is a classic C/C++ bug, and a very hard one to locate. I wondered if there's a way to add s...
I get this error in visual studio and I don't know the reason. It doesn't even show the line number. Any clue? Error 1 error LNK2028: unresolved token (0A000041) "void __cdecl free_img(struct Image *)" (?free_img@@$$FYAXPAUImage@@@Z) referenced in function "double * __cdecl calc_zernike_moments(struct Image const *,int,stru...
Like in the example below, what is allowed, how and why? class Shape { public: //... virtual Shape *clone() const = 0; // Prototype //... }; class Circle : public Shape { public: Circle *clone() const; //... }; ...
Background: So I'm working on a raytracer.. for my construction of the spatial partitioning scheme, I initially had some code like this: if (msize <= 2) { // create a leaf node Model **models = new Model*[msize]; for (uint i=0; i<msize; ++i) models[i] = &mlist[i]; *arrayPtr = Node(models, msize); // class Node contai...
I have a big binary file with lots of files stored inside it. I'm trying to copy the data of a PCX image from the file and write it to a new file which I can then open in an image editor. After obtaining the specs for the header of a PCX file I think that I've located the image in the big binary file. My problem is that I cannot figure ...
I managed to get a QPushButton to open a new window when pressed by using the following code (just snippets of code): AppDialog::AppDialog(QWidget *parent) : QDialog(parent) { QPushButton *button3 = new QPushButton(tr("Apps")); QHBoxLayout *hLayout = new QHBoxLayout; hLayout->addWidget(button3); setLayout(hLayout...
I would like to use an API that is written in c++. It involves including header files and libraries. How can I use this API in a C# application? ...
I have a macro for a character string as follows: #define APPNAME "MyApp" Now I want to construct a wide string using this macro by doing something like: const wchar_t *AppProgID = APPNAME L".Document"; However, this generates a "concatenating mismatched strings" compilation error. Is there a way to convert the APPNAME macro to a ...
I have a few years of experience in cross-platform desktop development (Windows and MacOSX, not Linux (at least not for GUI apps)). Usually I create the GUI on MacOSX with Cocoa, and on Windows I use the old-fashioned Windows API. I have not used Qt because when I started it was still under the GPL license. I find the native experience ...
I'm allocating a cl_mem buffer on a GPU and work on it, which works fine until a certain size is exceeded. In that case the allocation itself succeeds, but execution or copying does not. I do want to use the device's memory for faster operation so I allocate like: buf = clCreateBuffer (cxGPUContext, CL_MEM_WRITE_ONLY, buf_size, NULL, &c...
I am trying to implement a DateTime class in C++: class DateTime { public: DateTime(); DateTime(time_t ticks); DateTime(int day, int month, int year); DateTime(int day, int month, int year, int hour, int minute, int second); //... private: time_t ticks; int day; int month; //... } then in applicati...
I have a program that is supposed to read in values from user into a vector. My function is then supposed to keep a running sum and start from element 1 and compare element 2 to the sum(this point it is just element 1). Move to the next element, add element 2 to the sum and see if element 3 is greater than the sum of elements 1 and 2. ...
Suppose I have the following class hierarchy: class A { int foo; virtual ~A() = 0; }; A::~A() {} class B : public A { int bar; }; class C : public A { int baz; }; What's the right way to overload operator== for these classes? If I make them all free functions, then B and C can't leverage A's version without casting...
Hi, Can you suggest a good book for learning Windows Services programming using C++? Thanks, ...
#pragma once #include "LudoCore/Singleton.h" class LudoTimer : public Singleton<LudoTimer> { friend class Singleton<LudoTimer>; public: void Update(); void ShortenDay(); void LengthenDay(); UINT64 GetDeltaTime() const; float GetPercentageOfDayElapsed() const; private: LudoTimer(); ~LudoTimer(); UIN...