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i have to calculate diagonal using grid points
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No, I mean what is the programming problem? Telling us what you want to do does not give enough information about where you are stuck or what you have tried. If you know the mathematics of the problem then converting that into C++ code should not be too difficult.
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I am writing cfd code taking reference of FORTRAN code following is the code which i had written but this program is not running
#include<math.h>
#include<fstream>
#include<iomanip>
//#include "constant1.h"
using namespace std;
float radi=11,rado=59.99,dro;
float r=11,spar=0.9415,pi=3.141592654,cfl=0.50,wn=2*pi*0.6/radi;
int i=1,ni=200,nj=50,nth=ni,nrad=nj,ncon1=0,ncon2=0,ncon=1000,lod=3,lexp=2,eps=0;
//float wn;
static int j=1;
class project
{
public:
float x,y,r,th;
void grid()
{
fstream infile("grid11.dat",ios::out);
for(r=11;r<=60;r++)
{
for(th=0; th<=2*pi; th=th+((pi/100)+(.00025*pi/98)))
{
cout<
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Nileshb111 wrote: but this program is not running
Once again you are expecting us to guess what is happening; we cannot see your screen or read your mind. Please edit your message, add <pre> tags around your code to make it readable, and explain exactly what the problem is and where it occurs.
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I wanted to calculate outgoing flux on 2D circular grid. So first part of this code is for to get grid point after that i initializes variables on those grid points, now i want to calculate diagonal to get unit normal through it .
above code running upto global time step
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please can u help me to solve posted problem
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Not without some proper detail of the code you have written, what it is supposed to do, and what errors you receive.
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Can u give a c++ code to calculate flux over 2D grids please
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Nileshb111 wrote: Can u give a c++ code to calculate flux over 2D grids please
Sorry, no, particularly as I have no idea what you mean by "calculate flux over 2D grids".
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I am using WMI services to get drive info.
I am able to get all except blocksize of drive. I am getting incorrect value.
Code:
VariantClear(&vtProp);
hr = ptrclsObj->Get(L"BlockSize", 0, &vtProp, 0, 0);
INT BlockSize;
if ( FAILED(hr) == FALSE)
BlockSize = vtProp.intVal;;
Please guide.
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john5632 wrote: I am getting incorrect value.
What value, and what do you expect to be getting? What is ptrclsObj actually pointing at?
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OpenCV application need env. Var. Is it mandatory to use env var for open cv. without using env var can i deploy my application. Because in client side i dont have permission for adding env var.
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You already posted this (three times) in your question in Q&A, and received two answers. Please do not repost.
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Hey guys, I am kind of new with C++. I have an assignment to do which is similar to this one:
http://uenics.evansville.edu/~hwang/f07-courses/cs215/project2.html
My problems are how to read I/O files and how to actually DO this program. I am really lost with it.
Thanks
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From the linked page:
Reminder: Programming Projects (as opposed to Homework problems) are to be your own work. See syllabus for definitions of acceptable assistance from others.
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This is not my homework, as u can see this link is from 2007. That is why I posted instead of my homework. I need assistance, so I will be able to solve my homework. If you can post something/link that may help me I will appreciate. Otherwise thank you, but I do know about my responsibilities as a student.
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Well, you could be more specific, then.
For instance, you may use a ifstream object for reading from the file both the grid size and the grid itself, now what are your troubles with it?
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Is this your first assignment?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Yes, and before this I just knew how to calculate areas and those things using C++. So, it is a huge difference hahaha
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I have a need for creating a class template and you may help me.
[1] Multiple coclasses will be implemented in a single dll.
[2] Each coclass will implement the same interfaces but will have different class/clsid/resid.
[3] It is necessary to create a class template taking clsid/resid as its template paramemters.
[4] Finally, I need to use template classes for CoCreateInstance.
Let me elaborate more in detail.
Here is a simple interface IA defined.
interface IA : IDispatch
{
[id(1), helpstring("method M1")] HRESULT M1();
};
Below ia a coclass defined with Class(CComX), Clsid(CLSID_ComX), Resid(IDR_COMX).
It implements Intid(IA).
class ATL_NO_VTABLE CComX
: public CComObjectRootEx<ccomsinglethreadmodel>,
, public CComCoClass<comx, clsid_comx="">
, public IDispatchImpl
{
CComX();
~CComX();
BEGIN_COM_MAP(CComX)
COM_INTERFACE_ENTRY(IA)
COM_INTERFACE_ENTRY2(IDispatch, IA)
END_COM_MAP()
DECLARE_REGISTRY_RESOURCEID(IDR_COMX)
...
}
OBJECT_ENTRY_AUTO(CLSID_ComX, CComX)
Next, I need to create second coclass implementing the same interface IA but having different Class(CComY), Clsid(CLSID_ComY), and Resid(IDR_COMY).
So, I simply copied the above coclass and replaced 'X' with 'Y'.
class ATL_NO_VTABLE CComY
: public CComObjectRootEx<ccomsinglethreadmodel>,
, public CComCoClass<ccomy, clsid_comy="">
, public IDispatchImpl<ia, &iid_ia,="" &libid_comtlib,="" *wmajor="*/" 1,="" *wminor="*/" 0="">
{
CComY();
~CComY();
BEGIN_COM_MAP(CComY)
COM_INTERFACE_ENTRY(IA)
COM_INTERFACE_ENTRY2(IDispatch, IA)
END_COM_MAP()
DECLARE_REGISTRY_RESOURCEID(IDR_COMY)
...
}
OBJECT_ENTRY_AUTO(CLSID_ComY, CComY)
And I successfully CoCreateInstance'd these two coclasses:
HRESULT hr = S_OK;
ULONG rc = 0;
IA *pXA = NULL;
hr = CoCreateInstance(CLSID_ComX, NULL, CLSCTX_ALL, IID_IA, (void **)&pXA);
rc = pXA->Release();
IA *pYA = NULL;
hr = CoCreateInstance(CLSID_ComY, NULL, CLSCTX_ALL, IID_IA, (void **)&pYA);
rc = pYA->Release();
So far so good!
The problem is that I need to create many coclasses now and in the future.
I don't want to copy/paste for all of them because it is quite hard to maintain the source code for all the copy/paste'd coclasses. It is quite error-prone.
So, I definitely would like to create a class template.
Below, I created a class template and it compiled ok.
template
class ATL_NO_VTABLE CComT
: public CComObjectRootEx,
, public CComCoClass, &CLSID_T>
, public IDispatchImpl
{
CComT()
{
}
~CComT()
{
}
BEGIN_COM_MAP(CComT)
COM_INTERFACE_ENTRY(IA)
COM_INTERFACE_ENTRY2(IDispatch, IA)
END_COM_MAP()
DECLARE_REGISTRY_RESOURCEID(RESID_T)
...
}
//OBJECT_ENTRY_AUTO(CLSID_ComT, CComT)
I hope I am doing right.
Next, I would like to instantiate two template classes to replace the original CComX and CComY classes:
class CComT<clsid_comx, idr_comx="">;
class CComT<clsid_comy, idr_comy="">;
Is this right way to instantiate template coclasses?
And if so, how would I modify the above CoCreateInstance statements?
I have ComT.zip file containing all these classes but don't know how to upload here.
So, if you give me your email, I would send it.
thank you
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Hi
I'm trying to compile a c++ project on a raspberry pi using g++. I get the following compilation error:
PROCESS.CPP: In function ‘int process(int, char*, ControlData*, char*, char*)’:
PROCESS.CPP:172:49: error: ‘_fullpath’ was not declared in this scope
PROCESS.CPP:185:45: error: ‘_fullpath’ was not declared in this scope
The file PROCESS.CPP has the header
#include <stdlib.h> which I thought should contain this declaration. I have checked the header path using the g++ -H command and it gives /usr/include/stdlib.h so I presume it is finding the file.
I don't want to start fiddling with my own declarations within the scope as there are many other files to include in this project.
Any help would be appreciated
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The message says it is not declared in this scope, and identifies lines 172 and 185 as being where the error occurs. You need to look at those two lines to see what may be the reason.
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_fullpath is a Microsoft specific library function that does not exist on Unix systems. You may use the realpath[^] function instead.
[EDIT/UPDATE]
Because pathes are different on Unix and MS operating systems, the function call can't be simply replaced. I assume that you are tyring to compile some source that has been originally written for a Microsoft OS. You have to analyse the code and rewrite it to get similar behaviour on your Pi.
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