[Gdal-dev] New user having a problem reading a HDF5 formatted file

[Douglas Coward]

 Hi Everone,
   I am trying trouble opening a file to read data from a DBDBV (digital 
bathymetric data base variable resolution) HDF5 formatted file using GDAL. 
And I’m sure I’m just going something real dumb. 
    I needed to update to the latest version to get the HDF5 capable GDAL, 
so I downloaded FWTools100a7.exe and installed it.
    I copied the C:\Program Files\FWTools1.0.0a7\include directory and the 
C:\Program Files\FWTools1.0.0a7\lib directory to my source code tree. And I 
link gdal_i.lib into my project and include the gdal_priv.h header in my 
source file.
    I also downloaded 5-165-win.zip, the precompiled binaries of the HDF5 
library 1.6.5.
I copied the 5-165-win\include directory and the 5-165-win\lib directory to 
my source code tree. And I link hdf5.lib into my project and include the 
hdf5.h header in my source file.
 
I have had success doing tests used the gdalinfo utility on the database 
file:
 
C:\Program Files\FWTools1.0.0a7\bin>gdalinfo dbdbv_level0.h5
< Prints all the metadata, all the subdataset information>
 
I have had no success with tests of using gdal_translate on the database 
file:
 
C:\Program Files\FWTools1.0.0a7\bin>gdal_translate -of JPEG 
HDF5:"dbdbv_level0.h5":34477 ds34477.jpg
szFilenname dbdbv_level0.h5
Open!!
<After about 10 seconds the program crashes as it prints 
“/dbdbv/0.500/g/34477” which is the complete name of the correct dataset.>
 
   My real problem is that using the GDAL API Tutorial for opening a file to 
read, my program will calls GDALAllRegister(); just fine, then it calls 
poDataset = (GDALDataset *) GDALOpen( filename_, GA_ReadOnly );
with the filename set to “..\..\terrain\DBDBV4_0\dbdbv_level0.h5” and 
GDALOpen() never returns.
(Ooops, for two weeks I have been thinking that this function never returns, 
but I just accidentally left the debugger running while writting this email 
and GDALOpen did return with the file open, 22 minutes later.)
 
Then when I get the file open, how would I read a particular dataset (like 
“/dbdbv/0.500/g/34477”) through the API?
 
Thank you for your time,
 Doug Coward
 Software Engineer
 21st Century Systems Inc.
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