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Hello,

I have been thinking about this all day and I am yet to come up with a good solution. So, I need to design an image class which should work with various data types (int, float, double etc.)...

hello,

Sorry. It was not my intention to disappear but I had a terrible shoulder problem and was indisposed for a few weeks and might have to undergo a small surgery later. I was actually told not...

Hello,

I have a function where a particular chunk of nested loops takes majority of the time. I call this function a lot, so any speedup would be most welcome. I was wondering if anyone can spot...

Hello all,

I am porting some C# code to C++ and there is a particular bit that has me a bit perplexed. The code is as follows:



byte [,,] data = new byte[d,h,w];
int i=0;

for (int z = 0;...

This particular case is only 64x64, so not that large.

Ok, it seems that the real culprit actually is this line:

index += static_cast<int>(floorf((float)values[i]) * offsets[i]);

and not the...

Hello everyone,

I have a severe performance decrease when I am accessing random locations in a C-array. So, I have a function which is briefly as follows:



template<typename T>
int...

That is irrelevant. I am smoothing each axes using wavelet filtering. What would be the point of putting that in my question? I do not understand what you do not understand about wanting to traverse...

It is not the same at all.

I am not traversing the array sequentially but along the three axes.

You can imagine it to be a three dimensional array and each loop is traversing one of the...

Hello everyone,

I am unable to figure how to code the following in C++. It is quite simple when the dimensions of the input array is preset. However, I am at a loss on how to do this when that is...

Hello everyone,

I have been trying to cast some pointers in 'unsafe' code block but running into the following error:
error CS0208: Cannot take the address of, get the size of, or declare a...

Hello,

Can I do this?



float tt = 15.57;
float *pt = &tt;
unsigned *it = reinterpret_cast<unsigned *>(pt);
std::cout << *it << std::endl;

Hello,

I currently have an unmanaged DLL written in C++ and I can call the exported methods in this DLL from my C# app without any problems and it works quite well.

Now, I need to call from...

Hello,

I have a small DLL written in C++ that exports 4 functions. I call this DLL from my C# application and can call all these functions without any problem.

I want to arrange for a DLL...

Ok, I fixed that problem. So, there were two issues:

First, I had to call ReleaseHdc on the graphic object.
Secondly, the HDC parameter should have been declated as an 'out' parameter.
...

Hello everyone,

I am trying to use some managed code with some unmanaged rendering functions using OpenGL. I have a C# bitmap and I am trying to use OpenGL functions to draw on this bitmap.
...

Hello,

I have a bitmap object that is created in C# and I want to share this bitmap between managed and unmanaged code.

So, I have something as follows in my C# code:



void DrawGraphic()...

Hello everyone,

I have a C# application that allows users to write some plugins. I have an app that I have written in C++ and OpenGL and I want to write a plugin that encapsulates that app.

So,...

Hello,

Thanks for the reply. What I wanted was basically that all GUI events would be marshalled and passed to the unmanaged window and maybe I could write some simple wrapper around the unmanaged...

Hello everyone,

I have a managed app that I have inherited and I have another GUI application that is written using Qt and OpenGL. What I would like to do is create an instance of my unmanaged GUI...

Hello everyone,

I have a question about doing arithmetic with C++. Say I have something like:

(71/10) - 7.0 and it gives me something like: 0.0999999. How can I get it to give me 0.1.
...

Yes, the sub-blocks will not be contiguous. It is a 3D array and I have certain offsets after reading each line of the sub-block.

Thanks again everyone.

xarg

The underlying datatype are floats or doubles. Can I still use memcpy without any problems? I am always scared of using bulk copy!

The comments about using STL and boost are very valid but...

I think you have to parse the input string using functions like atof or atoi.

cin >> atof(side1);

... etc.

xarg

Hello everyone,

I have a bit of code which needs to read sub-blocks of data in a big array. So, the big array represents a 3D dimensional structure in memory and I need to access a cube like block...

I did not make that explicit. FLT_MAX is defined in float.h

The reason is that one function marks some array elements as FLT_MAX to indicate that they should not be part of some computation. I...