Problem
If you try to load the samples file "gg_ml.tmpl", it can fail because that one is not in the usual samples location but in "ifs_samples". Normally you extend the ECCODES_SAMPLES_PATH to include the ifs_samples directory. But with MEMFS the samples (and also definitions) are not installed (instead they are all embeddedwithin the library.
So for example let's say we have the following Fortran program that loads 2 samples:
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<pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background-color: rgb(240, 240, 240); color: rgb(68, 68, 68);"><span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">program</span></span> sample
<span class="hljs-keyword" style="font-weight: 700;">use</span> eccodes
<span class="hljs-keyword" style="font-weight: 700;">implicit</span> <span class="hljs-keyword" style="font-weight: 700;">none</span>
<span class="hljs-keyword" style="font-weight: 700;">integer</span> :: s1, s2, section4Length
<span class="hljs-comment" style="color: rgb(136, 136, 136);">! Try to load an IFS sample: ifs_samples/grib1_mlgrib2/gg_ml.tmpl</span>
<span class="hljs-keyword" style="font-weight: 700;">call</span> codes_grib_new_from_samples(s1, <span class="hljs-string" style="color: rgb(136, 0, 0);">"gg_ml"</span>)
<span class="hljs-keyword" style="font-weight: 700;">call</span> codes_get(s1, <span class="hljs-string" style="color: rgb(136, 0, 0);">'section4Length'</span>, section4Length)
<span class="hljs-built_in" style="color: rgb(57, 115, 0);">write</span> (*, *) <span class="hljs-string" style="color: rgb(136, 0, 0);">'IFS sample gg_ml: section4Length='</span>, section4Length
<span class="hljs-keyword" style="font-weight: 700;">call</span> codes_release(s1)
<span class="hljs-comment" style="color: rgb(136, 136, 136);">! Try to load a core sample: samples/GRIB2.tmpl</span>
<span class="hljs-keyword" style="font-weight: 700;">call</span> codes_grib_new_from_samples(s2, <span class="hljs-string" style="color: rgb(136, 0, 0);">"GRIB2"</span>)
<span class="hljs-keyword" style="font-weight: 700;">call</span> codes_get(s2, <span class="hljs-string" style="color: rgb(136, 0, 0);">'section4Length'</span>, section4Length)
<span class="hljs-built_in" style="color: rgb(57, 115, 0);">write</span> (*, *) <span class="hljs-string" style="color: rgb(136, 0, 0);">'Core sample GRIB2: section4Length='</span>, section4Length
<span class="hljs-keyword" style="font-weight: 700;">call</span> codes_release(s2)
<span class="hljs-keyword" style="font-weight: 700;">end</span> <span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">program</span></span> sample</pre> |
Compile and run the program. It should fail:
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% ./sample.exe
ECCODES ERROR : Unable to load sample file 'gg_ml.tmpl'
from /MEMFS/samples
ECCODES ERROR : grib_new_from_samples: (gg_ml) File not found |
Solution
Extend the samples path to search in the IFS samples location too (by setting the ECCODES_SAMPLES_PATH environment variable):
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% export ECCODES_SAMPLES_PATH=/MEMFS/ifs_samples/grib1_mlgrib2:/MEMFS/samples
% ./sample.exe
IFS sample gg_ml: section4Length= 770
Core sample GRIB2: section4Length= 34
# Now it works fine |
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