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Monday, 8 January 2007
|
| how to use <fstream.h> Yaso21101975 07:13:45 |
| | hi all
i use visual c++ under windows and i want to know how to use ifstream
and ofstream to read and write binary data to a file
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| |  1 answer | Add comment |
|
| [ROOT] How to reference an object in a TFile? Tom Roberts 04:46:55 |
| | I am an experienced C++ developer new to root.
I am implementing a graphical user interface for my users, and I want
them to be able to select any single TNtuple out of any open Root file.
So I loop over gROOT->GetListOfFiles() and descend each file's directory
tree, putting the TNtuple pointers into a std::vector<TNtuple*> (and
also their names into a TGListBox from which the user will select).
Inside that loop I can call p->GetName() and p->GetEntries(), for p the
current pointer to a TNtuple. But later, after all NTuples have been
found and the loop over files is complete, I cannot call any TNtuple
function using those pointers -- an interpreter segfault happens. I
guess those objects no longer remain in memory (??).
Is there a better way to do this? I do not expect my users to understand
TBrowser and then know enough to open the TreeViewer -- I am basically
re-implementing HistoScope for Root files....
I tried keeping a std::vector<TString> with each entry the full name of
the TNtuple (i.e. /path/file.root:/path/name ). How can I turn that name
into a TNtuple pointer I can use? -- do I need to laboriously descend
into the file as before? (a pain, as TDirectory::GetPath() does not
return the actual root path when inside a TFile)
What is the difference between folders and directories? -- there seem to
be parallel but different functions and objects...(??)
How does it decide which objects to remove from memory? -- after all, I
had recently referenced each and every NTuple....
[If it matters, my loop just uses pointers to TDirectory-s,
never opening any TFile nor calling any cd() function.]
Tom Roberts
|
| | 2 answer | Add comment |
Sunday, 7 January 2007
|
| library function getopt returns junk character? mano M 00:38:13 |
| | My prgram returns a junk charater in AIX .But it works fine in Linux.
Program.c#include<stdio.h>
#include<stdlib.h>
int
main(int argc, char *argv[])
{
char c;
int i;
char *url = "http://";
char *msg = "Hello World, I'm in C!!!";int debug=0;
int Verbose=0;
extern char *optarg;
while ( (c=getopt(argc, argv, "gm:u:v")) != EOF )
{
switch(c) {
case 'g': debug = 1;
break;
case 'm': msg = optarg;
printf("\n msg=%s \n",msg);
&n bsp; break;
case 'u': url = optarg;
printf("\n url=%s \n",url);
break;
case 'v': Verbose = 1;
break;
default : { printf( "ERROR: invalid argument %c\n", c);
exit(0);}
} /* switch */
}
return 0;
}
./a.out -m "hello" -u "yahoo.com" -v aix returns:ERROR: invalid
argument Ъ
But it returs the right messages in Linux. Can anyone knows...? Mano.
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| | 5 answers | Add comment |
Saturday, 6 January 2007
|
| runing c/c++ in linux Jahid32s 23:05:56 |
| | hi i am jahide i am new i linux. I can not run c/c++
program in linux. can any one help me?
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|
| | 7 answers | Add comment |
|
| RE: FunctionArray Mikmoken2003 19:38:00 |
| | Hi favor... Can you please help doing my simple program in c the
function. i got some code but i need to add something to get better
grades. This is I want to solve or put.. please help me with this....
1. getAverage
2. Smallest
3. TPON (Total Positive Odd Numbers)
4. TNEVN (Total Negative Even Numbers)
5. Search / Searching
6. Sort / Sorting
7. displayPON (display Positive Odd Numbers)
8. displayNEN (display Negative Even Numbers)
heres my code I've wrote....
#include <stdio.h>
#define size 10
/*prototypes and headers*/
void getArray(int arr[]);
void displayArray(int arr[]);
int getTotal(int arr[]);
/*main function*/
void main()
{
int a[size];
getArray(a);
displayArray(a);
printf("\n The total value in an array is %d \n\n",getTotal
(a));
}
/*accept value from the keyboard of an array*/
void getArray(int arr[])
{
int x;
for(x=0;x<size;x++)
{
printf("\n Provide a value in array[%d]\x10",x);
scanf("%d",&arr[x]);
}
}
void displayArray(int arr[])
{
int x;
for(x=0;x<size;x++)
{
printf("\n the value in index[%d] = %d",x,arr[x]);
}
}
int getTotal(int arr[])
{
int x,sum=0;
for(x=0;x<size;x++)
{
sum+=arr[x];
}
return sum;
}
//////////////////////
I you dont have to do something just try to help me if you don't
mind.... thanks a lot.... and more power to all.....
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| | 2 answer | Add comment |
|
| [ROOT] Problem with the 3D image resolution in ROOT Stephen Liu 16:36:55 |
| | Dear all,
I'm trying to draw a 3D image of several detectors via the following codes,
the geormetry of the detectors is stored in geom_mdc.root file. The program
works correctly, but I find the resolution of the image rather
unsatifactory. I'm wondering if there is any way I can set a higher
resolution in the Draw() method, or something else. Thanks a lot for your
help.
liuk
void readVol()
{
gSystem->Load("libGeom");
TGeoManager *geom = new TGeoManager("simple1", "Simple geometry");
geom->SetVisLevel(6);
TFile *f=new TFile("geom_mdc.root");
TGeoVolume *volBes = (TGeoVolume*)(f->Get("volBes"));
gGeoManager->SetTopVolume(volBes);
gGeoManager->CloseGeometry();
volBes->Draw();
}
|
| | 1 answer | Add comment |
|
| is it possible to separate the files based on its extension Vanathi 16:27:39 |
| |
i have to separate the real time and non real time files.
but is it possible to separate the files based on its extension?
if it is possible,
plaese tell the way
real time- audio,video and CBR
non real time-FTP, text
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| | 1 answer | Add comment |
|
| A general Fabian Z. Ward 14:11:28 |
| | |
| | Add comment |
|
| My coupling Lara Clinton 07:14:54 |
| | |
| | Add comment |
|
| Rolex Rolex I want you Rolex! ww4 Lance Rivers 04:10:44 |
| | Dear roottalk-outgoing@pcroot.cern.ch
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|
| | Add comment |
Friday, 5 January 2007
|
| Re: What is the size of c++ class which contain 3 virtual funcions: to Paul Herring! Gopi Krishna Komanduri 16:32:50 |
| | Hi Paul,
I read your comment for my reply. Could you please clarify what you
meant by "It depends on the implementation". Beacuse , what I thought
is when we have virtual function in a class , then there should be a V
Table for it which will be pointing out to the addresses of the
functions which will be usefull maily in late binding.
Please correct me if I am wrong.
Thanks&Regards,
GopiKrishnaKomanduri
Paul Herring <pauljherring-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
On 1/5/07, Gopi Krishna Komanduri < gopikomanduri@yahoo.com [mailto:gopikomanduri-/E1597aS9LQAvxtiuMwx3w@public.gmane.org]>
wrote:
HI Murali,
In a class if it has only 3 virtual functions with out any
variables , then it will just contain a pointer to the VTABLE
so the size should be four according to MS compiler. It
depends on the compiler I believe.
It depends on the implementation. Compilers don't have to use a
vtable to implement virtual functions (though it's currently
thought to be the most efficient way of implementation.)
--
PJH
#713059 +(1255)- [X]
<SaintAlvus> Does the name Doctor Pavlov ring a bell?
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Thursday, 4 January 2007
|
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|
| | 3 answer | Add comment |
|
| Re: homework (was: help plz--its urgent) Ray Devore 07:47:32 |
| | --- "t_u.l_i_p" <t_u.l_i_p-/E1597aS9LQAvxtiuMwx3w@public.gmane.org> wrote:> Hey pals!!! plz help me out in making this program> in c++..> i m to Declare a pointer that holds a two> dimensional array of double > (data type).then Create an array of doubles that has> the number of > rows and columns as specified by the user in R and> C.> ~~~~~~> explainaition::>>>> for this i m to use a pointer to a pointer of double> to create the 2D > dynamic array A like this double** A ,and a pointer> to double notation > to create a row and hen Using a loop with counter> less or equal to > the number of rows to create array of columns for> each row.....>
FiRST i m 2 make array of rows then aray of colums> for each row, > then dynamically i am to dsplay this array,,, and> afterwen this array > is of no longer use i am to delete array of colums> and den array of > rows (wen all arrays of colums are deleted)> ~~~~~~~> replyng me will b kind on ur part> Tulip,
I will be kind. This is not a chat room, so do not
use chat terms. Show us your attempt and we will help
you where you get stuck. We are here to help, not do
the work for you.
Ray
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| With querulous a retribution Cecile Chappell 06:24:58 |
| |
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| It my twombly Carolina Denny 06:20:13 |
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| Pierre hat hier richtig Geld gewonnen Ester & Noah 05:55:18 |
| | Super
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| help plz--its urgent T_u.L_i_p 00:37:18 |
| | Hey pals!!! plz help me out in making this program in c++..
i m to Declare a pointer that holds a two dimensional array of double
(data type).then Create an array of doubles that has the number of
rows and columns as specified by the user in R and C.
~~~~~~
explainaition::>>>
for this i m to use a pointer to a pointer of double to create the 2D
dynamic array A like this double** A ,and a pointer to double notation
to create a row and hen Using a loop with counter less or equal to
the number of rows to create array of columns for each row.....
FiRST i m 2 make array of rows then aray of colums for each row,
then dynamically i am to dsplay this array,,, and afterwen this array
is of no longer use i am to delete array of colums and den array of
rows (wen all arrays of colums are deleted)
~~~~~~~
replyng me will b kind on ur part
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Wednesday, 3 January 2007
|
| double to float to double Rgearyiii 19:51:30 |
| |
I'm trying to measure the error of a double-to-float conversion, but
I'm not having success. The following code demonstrates how:
int main() {
double x = 389.298897140148174498;
float w = static_cast<float>(x);
double y = static_cast<double>(w);
double z = x - y;
return 0;
}
In the VC++ debugger, y is shown to be exactly equal to w, and
likewise z to be equal to zero.
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