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/* This is part of the netCDF package.
Copyright 2006 University Corporation for Atmospheric Research/Unidata.
See COPYRIGHT file for conditions of use.
This is a very simple example which reads a 2D array of
sample data produced by simple_xy_wr.cpp.
This example is part of the netCDF tutorial:
http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-tutorial
Full documentation of the netCDF C++ API can be found at:
http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-cxx
$Id: simple_xy_rd.cpp,v 1.13 2007/01/19 12:52:13 ed Exp $
*/
#include <iostream>
#include <netcdfcpp.h>
using namespace std;
// We are reading 2D data, a 6 x 12 grid.
static const int NX = 6;
static const int NY = 12;
// Return this in event of a problem.
static const int NC_ERR = 2;
int main(void)
{
// This is the array we will read.
int dataIn[NX][NY];
// Open the file. The ReadOnly parameter tells netCDF we want
// read-only access to the file.
NcFile dataFile("simple_xy.nc", NcFile::ReadOnly);
// You should always check whether a netCDF file open or creation
// constructor succeeded.
if (!dataFile.is_valid())
{
cout << "Couldn't open file!\n";
return NC_ERR;
}
// For other method calls, the default behavior of the C++ API is
// to exit with a message if there is an error. If that behavior
// is OK, there is no need to check return values in simple cases
// like the following.
// Retrieve the variable named "data"
NcVar *data = dataFile.get_var("data");
// Read all the values from the "data" variable into memory.
data->get(&dataIn[0][0], NX, NY);
// Check the values.
for (int i = 0; i < NX; i++)
for (int j = 0; j < NY; j++)
if (dataIn[i][j] != i * NY + j)
return NC_ERR;
// The netCDF file is automatically closed by the NcFile destructor
cout << "*** SUCCESS reading example file simple_xy.nc!" << endl;
return 0;
}
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