Hi -
I've been trying to figure out how to read data using the hdf-java without
success. All data values returned are zero. Thinking the data was somehow
corrupted, I validated the file by writing an equivalent C program, and then
looked at the data using hdfview.
After validating, I decided to try the TestH4File.java example, running the
"testH4SDS" test, and --- got the same result. All values output are zero
(and should not be).
I've tried this on both my Mac (Lion) and on an Ubuntu 11 box. I'm using
hdf-java 2.8 and java 1.6 (64b).
Any insights are appreciated.
Thanks,
Susan
=== output ===
Julian Date and Time
_FillValue
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Longitude
_FillValue
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
(I modified line 205 to take the min of the array size of 10, vs. 1000 for
brevity.)
===== relevant code ====
/**
* Test H4SDS.
*/
private static void testH4SDS(String fileName)
{
H4File h4file = new H4File(fileName, HDFConstants.DFACC_READ);
try {
h4file.open();
} catch (Exception ex)
{
System.out.println(ex);
}
DefaultMutableTreeNode root =
(DefaultMutableTreeNode)h4file.getRootNode();
H4SDS sds = null;
DefaultMutableTreeNode node = null;
if (root != null)
{
Enumeration nodes = root.depthFirstEnumeration();
while (nodes.hasMoreElements())
{
node = (DefaultMutableTreeNode)nodes.nextElement();
Object obj = node.getUserObject();
if (obj instanceof H4SDS)
{
sds = (H4SDS)obj;
System.out.println(sds);
// test H4CompoundDS attributes
Attribute attr = null;
List info = null;
try {
info = sds.getMetadata();
} catch (Exception ex)
{ System.out.println(ex); }
int n = 0;
if (info != null)
{
n = info.size();
for (int i=0; i<n; i++)
{
attr = (Attribute)info.get(i);
System.out.println(attr);
}
}
// data
Object data = null;
try
{
data = sds.read();
} catch (Exception ex) {System.out.println(ex);}
if ((data != null) && data.getClass().isArray())
{
// print out the first 1000 data points
n = Math.min(Array.getLength(data), 10);
StringBuffer sb = new StringBuffer();
for (int j=0; j<n; j++)
{
sb.append(Array.get(data, j));
sb.append(" ");
}
System.out.println(sb.toString());
}
} //if (obj instanceof H4Group
} //while (nodes.hasMoreElements())
} //if (root != null)
try {
h4file.close();
} catch (Exception ex)
{
System.out.println(ex);
}
}
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