Hi ROOTers,
I'm trying to write some code to read out data from binary
files. The data's in the form of short integers, so I have to read out
blocks of two bytes at a time into a variable. My code is:
#include <iostream.h>
#include <fstream.h>
int main()
{
char data_file[60];
short nevents;
cout<<"Enter path to data file: ";
cin>>data_file;
ifstream data;
data.open(data_file, ios::in|ios::binary);
if(data.fail())
{
cout<<"Failed to open file "<<data<<endl;
return 0;
}
data.seekg(0,ios::beg);
data.read(&nevents, 2);
data.close();
cout<<"Number of events = "<<nevents<<endl;
return 0;
}
This runs fine when compiled externally to ROOT, but when loading and
running in ROOT I get the error message:
root [2] main()
Enter path to data file: /scratch/morgan/run1/Card1_0
Error: Can't call ifstream::read(&nevents,2) in current scope
FILE:readtest.C LINE:21
Possible candidates are...
filename line:size busy function type and name (in ifstream)
filename line:size busy function type and name (in fstreambase)
filename line:size busy function type and name (in ios)
filename line:size busy function type and name (in istream)
(compiled) 0:0 0 public: istream& read(char* s,int n);
filename line:size busy function type and name (in ios)
*** Interpreter error recovered ***
>From looking at other ifstream/fstream related ROOTtalk messages, I assume
this problem is something to do with CINT, but if so is there any other way
to read this data in within ROOT (I want to use this code in a script
eventually)? I'm using ROOT v3.01/06 on a Linux PC.
Thanks,
Ben Morgan.
--
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Mr. Ben Morgan
Postgraduate Student
University of Sheffield
Department of Physics & Astronomy
Hicks Building
Hounsfield Road
Sheffield S3 7RH
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