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Hello,

I am just wondering what the best practice is for when to use static classes (by static class, I mean a class which has only static attributes and functions).

If you are creating more...

Hello,

I have a very general question about object-orientation programming. I have been programming for a few years, but I'm just wondering what the best practice is for this particular situation....

Hello,

I have a Visual Studio 10 Project, and I want to rename both the Project, and the Solution. To do this so far, I have right-clicked on the Project or Solution in the Solution Explorer, then...

Hello,

I want to edit the contents of a file using fstream, but none of the modes in the fstream constructor work for me.

If I use ios::trunc, then the whole file is deleted - but I want to...

Hello,

This is not strictly a C++ question, but I don't know where else to ask!

Anyway, I am writing a program to read and write EXIF data in a JPEG file; specifically, the GPS data.

I have...

Hello,

I'm hoping that there is somebody out there who is familiar with OpenCV, as I have a very simple problem.

I have a linear equation Ax = B which I want to solve. This is done with the...

Hello,

I have a library that I want to link to with Visual Studio 10. It is a dynamic-link library, with a .dll file and a .lib file. I am following what I think is the correct procedure for...

Hello,

I have a fairly basic question about compiling libraries. Suppose that I want to use an open-source library that has been written by somebody else. Typically, when I go to the website to...

But is it possible to write the vector.size() value at the beginning of the file, after I've written the rest of the file?

The reason I need that piece of code is because I need to read the last entry in the data file, before I read the rest of the file. When creating the file, I am adding numbers from an array to the...

Hi,

Thanks for your help. Losing the ios::app worked!

However, I have also come across something else peculiar.

If I use:


in.seekg(-(sizeof(int)), ios::end);

Hello,

I am saving data to a file "myfile.dat". Every time I save new data, I want to eliminate the existing file and start a new file. From what I know, setting the ios::trunc flag should do...

Hi, thanks for your reply. The Wikipedia article states that:

"the Perron–Frobenius theorem ... asserts that a real square matrix with positive entries has a unique largest real eigenvalue and...

Hello,

I am trying to use the GNU Scientific Library (GSL) to compute the leading eigenvector (corresponding to the largest eigenvalue) of a matrix M of size N (N ~ 100). M is square and...

Hello,

I am using a computer vision C++ library called OpenCV, which has a function "int waitKey(int delay)". This function waits for a user input key, for a specified number of milliseconds. It...

Hello,

I am running Windows 7 on a Mac, using Apple's Bootcamp utility, such that the Windows installation is native. However, I am finding some issues when programming the Windows API using...

Hello,

What is the difference between the header files <header.h> and <header>?

I know that the <...> brackets indicate that the header file is located in some standard directory that the...

Hello,

I'd like to ask two different questions on a related topic please...

1. When I am writing float data to a text file, I want to set the precision. I know that with std::cout, you can...

Hello,

I have two classes, Class1 and Class2, declared in two header files, "class1.h" and "class2.h". Each class contains a member instance of the other class. If I #include the necessary header...

Hello,

I know that when writing a class declaration, if the class contains an array of fixed length, then the length of that array can be initialized in the class declaration, without having to do...

Hello,

I'm sure this is a very simple issue, but it is confusing me a lot right now. So I am writing a program which uses a .dll file and a .lib file. I don't know much about these, but from what...

Hi,

Thanks - I managed to fix it by using cvmSet(), which seems to automatically convert to a float.

However, I am now having an issue with the "status" matrix. I want to print out the...

Hello,

I am writing a program to estimate the fundamental matrix between two images, using OpenCV. This is a computer vision technique, but the error I am getting is something to do with memory in...

Hello,

Hopefully somebody on here is familiar with OpenCV....

I am using OpenCV to try to create a 20 x 2 matrix, with floating point elements, and assign the first element of the matrix to...

Hello,

I wanted to create a custom control in Visual Studio, and then add it as a component to a form. So, I added a new "User Control" to the project, and edited it by dragging and dropping...