2013-04-02 14:02:10 +00:00
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< title > grib_api: keys_iterator.c< / title >
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< h1 > keys_iterator.c< / h1 > keys_iterator.c How to get the names of all the keys defined in a message and how to iterate through them.< p >
< div class = "fragment" > < pre class = "fragment" > < a name = "l00001" > < / a > 00001
< a name = "l00010" > < / a > 00010 < span class = "comment" > /*< / span >
< a name = "l00011" > < / a > 00011 < span class = "comment" > * C Implementation: keys_iterator< / span >
< a name = "l00012" > < / a > 00012 < span class = "comment" > *< / span >
< a name = "l00013" > < / a > 00013 < span class = "comment" > * Description:< / span >
< a name = "l00014" > < / a > 00014 < span class = "comment" > * Example on how to use keys_iterator functions and the< / span >
< a name = "l00015" > < / a > 00015 < span class = "comment" > * grib_keys_iterator structure to get all the available< / span >
< a name = "l00016" > < / a > 00016 < span class = "comment" > * keys in a message.< / span >
< a name = "l00017" > < / a > 00017 < span class = "comment" > *< / span >
< a name = "l00018" > < / a > 00018 < span class = "comment" > * Author: Enrico Fucile< / span >
< a name = "l00019" > < / a > 00019 < span class = "comment" > *< / span >
< a name = "l00020" > < / a > 00020 < span class = "comment" > *< / span >
< a name = "l00021" > < / a > 00021 < span class = "comment" > */< / span >
< a name = "l00022" > < / a > 00022
< a name = "l00023" > < / a > 00023 < span class = "preprocessor" > #include < assert.h> < / span >
< a name = "l00024" > < / a > 00024 < span class = "preprocessor" > #include < stdlib.h> < / span >
< a name = "l00025" > < / a > 00025 < span class = "preprocessor" > #include < stdio.h> < / span >
< a name = "l00026" > < / a > 00026 < span class = "preprocessor" > #include < unistd.h> < / span >
< a name = "l00027" > < / a > 00027
2015-01-05 15:45:46 +00:00
< a name = "l00028" > < / a > 00028 < span class = "preprocessor" > #include "< a class = "code" href = "grib__api_8h.html" title = "Copyright 2005-2015 ECMWF." > grib_api.h< / a > "< / span >
2013-04-02 14:02:10 +00:00
< a name = "l00029" > < / a > 00029
< a name = "l00030" > < / a > 00030 < span class = "preprocessor" > #define MAX_KEY_LEN 255< / span >
< a name = "l00031" > < / a > 00031 < span class = "preprocessor" > < / span > < span class = "preprocessor" > #define MAX_VAL_LEN 1024< / span >
< a name = "l00032" > < / a > 00032 < span class = "preprocessor" > < / span >
< a name = "l00033" > < / a > 00033 < span class = "keyword" > static< / span > < span class = "keywordtype" > void< / span > usage(< span class = "keywordtype" > char< / span > * progname);
< a name = "l00034" > < / a > 00034
< a name = "l00035" > < / a > 00035 < span class = "keywordtype" > int< / span > main(< span class = "keywordtype" > int< / span > argc, < span class = "keywordtype" > char< / span > *argv[])
< a name = "l00036" > < / a > 00036 {
< a name = "l00037" > < / a > 00037 < span class = "comment" > /* To skip read only and not coded keys< / span >
< a name = "l00038" > < / a > 00038 < span class = "comment" > unsigned long key_iterator_filter_flags=GRIB_KEYS_ITERATOR_SKIP_READ_ONLY ||< / span >
< a name = "l00039" > < / a > 00039 < span class = "comment" > GRIB_KEYS_ITERATOR_SKIP_COMPUTED;< / span >
< a name = "l00040" > < / a > 00040 < span class = "comment" > */< / span >
< a name = "l00041" > < / a > 00041 < span class = "keywordtype" > unsigned< / span > < span class = "keywordtype" > long< / span > key_iterator_filter_flags=< a name = "a0" > < / a > < a class = "code" href = "group__keys__iterator.html#g0e4d2d943ddd61d0b877060e6fbea405" > GRIB_KEYS_ITERATOR_ALL_KEYS< / a > ;
< a name = "l00042" > < / a > 00042
< a name = "l00043" > < / a > 00043 < span class = "comment" > /* valid name_spaces are ls and mars */< / span >
< a name = "l00044" > < / a > 00044 < span class = "keywordtype" > char< / span > * name_space=< span class = "stringliteral" > "ls"< / span > ;
< a name = "l00045" > < / a > 00045
< a name = "l00046" > < / a > 00046 < span class = "comment" > /* name_space=NULL to get all the keys */< / span >
< a name = "l00047" > < / a > 00047 < span class = "comment" > /* char* name_space=0; */< / span >
< a name = "l00048" > < / a > 00048
< a name = "l00049" > < / a > 00049 FILE* f;
< a name = "l00050" > < / a > 00050 < a name = "a1" > < / a > < a class = "code" href = "group__grib__handle.html#g309a5ee24f4c730646d3f80ad0ef5f1b" > grib_handle< / a > * h=NULL;
< a name = "l00051" > < / a > 00051 < a name = "a2" > < / a > < a class = "code" href = "group__keys__iterator.html#gfa22412541f9d2df9680a82371036dbb" > grib_keys_iterator< / a > * kiter=NULL;
< a name = "l00052" > < / a > 00052 < span class = "keywordtype" > int< / span > err=0;
< a name = "l00053" > < / a > 00053 < span class = "keywordtype" > int< / span > grib_count=0;
< a name = "l00054" > < / a > 00054
< a name = "l00055" > < / a > 00055 < span class = "keywordtype" > char< / span > value[MAX_VAL_LEN];
< a name = "l00056" > < / a > 00056 < span class = "keywordtype" > size_t< / span > vlen=MAX_VAL_LEN;
< a name = "l00057" > < / a > 00057
< a name = "l00058" > < / a > 00058 < span class = "keywordflow" > if< / span > (argc != 2) usage(argv[0]);
< a name = "l00059" > < / a > 00059
< a name = "l00060" > < / a > 00060 f = fopen(argv[1],< span class = "stringliteral" > "r"< / span > );
< a name = "l00061" > < / a > 00061 < span class = "keywordflow" > if< / span > (!f) {
< a name = "l00062" > < / a > 00062 perror(argv[1]);
< a name = "l00063" > < / a > 00063 exit(1);
< a name = "l00064" > < / a > 00064 }
< a name = "l00065" > < / a > 00065
< a name = "l00066" > < / a > 00066 < span class = "keywordflow" > while< / span > ((h = < a name = "a3" > < / a > < a class = "code" href = "group__grib__handle.html#g5e24f8499aa7e4178ccc25a5de3145c5" title = "Create a handle from a file resource." > grib_handle_new_from_file< / a > (0,f,& err)) != NULL) {
< a name = "l00067" > < / a > 00067
< a name = "l00068" > < / a > 00068 grib_count++;
< a name = "l00069" > < / a > 00069 printf(< span class = "stringliteral" > "-- GRIB N. %d --\n"< / span > ,grib_count);
< a name = "l00070" > < / a > 00070 < span class = "keywordflow" > if< / span > (!h) {
< a name = "l00071" > < / a > 00071 printf(< span class = "stringliteral" > "ERROR: Unable to create grib handle\n"< / span > );
< a name = "l00072" > < / a > 00072 exit(1);
< a name = "l00073" > < / a > 00073 }
< a name = "l00074" > < / a > 00074
< a name = "l00075" > < / a > 00075 kiter=< a name = "a4" > < / a > < a class = "code" href = "group__keys__iterator.html#g66a11d157fc81e1c27fc2acad0a5b1f4" > grib_keys_iterator_new< / a > (h,key_iterator_filter_flags,name_space);
< a name = "l00076" > < / a > 00076 < span class = "keywordflow" > if< / span > (!kiter) {
< a name = "l00077" > < / a > 00077 printf(< span class = "stringliteral" > "ERROR: Unable to create keys iterator\n"< / span > );
< a name = "l00078" > < / a > 00078 exit(1);
< a name = "l00079" > < / a > 00079 }
< a name = "l00080" > < / a > 00080
< a name = "l00081" > < / a > 00081 < span class = "keywordflow" > while< / span > (< a name = "a5" > < / a > < a class = "code" href = "group__keys__iterator.html#g28f6ac808ecdc324fa3a47bc7b3f6dec" > grib_keys_iterator_next< / a > (kiter))
< a name = "l00082" > < / a > 00082 {
< a name = "l00083" > < / a > 00083 < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > * name = < a name = "a6" > < / a > < a class = "code" href = "group__keys__iterator.html#gec3348471f770965c07964e286249e12" > grib_keys_iterator_get_name< / a > (kiter);
< a name = "l00084" > < / a > 00084 vlen=MAX_VAL_LEN;
< a name = "l00085" > < / a > 00085 GRIB_CHECK(< a name = "a7" > < / a > < a class = "code" href = "group__get__set.html#g8aeaf9f930eea1cc0f15e92f18a25053" title = "Get a string value from a key, if several keys of the same name are present, the..." > grib_get_string< / a > (h,name,value,& vlen),name);
< a name = "l00086" > < / a > 00086 printf(< span class = "stringliteral" > "%s = %s\n"< / span > ,name,value);
< a name = "l00087" > < / a > 00087 }
< a name = "l00088" > < / a > 00088
< a name = "l00089" > < / a > 00089 < a name = "a8" > < / a > < a class = "code" href = "group__keys__iterator.html#g79716d2b701c3dbb3d3a8e633f35a40a" > grib_keys_iterator_delete< / a > (kiter);
< a name = "l00090" > < / a > 00090
< a name = "l00091" > < / a > 00091 }
< a name = "l00092" > < / a > 00092
< a name = "l00093" > < / a > 00093 < span class = "keywordflow" > return< / span > 0;
< a name = "l00094" > < / a > 00094
< a name = "l00095" > < / a > 00095 }
< a name = "l00096" > < / a > 00096
< a name = "l00097" > < / a > 00097 < span class = "keyword" > static< / span > < span class = "keywordtype" > void< / span > usage(< span class = "keywordtype" > char< / span > * progname) {
< a name = "l00098" > < / a > 00098 printf(< span class = "stringliteral" > "\nUsage: %s grib_file\n"< / span > ,progname);
< a name = "l00099" > < / a > 00099 exit(1);
< a name = "l00100" > < / a > 00100 }
< a name = "l00101" > < / a > 00101
< / pre > < / div > < hr size = "1" > < address style = "text-align: right;" > < small > Generated on Tue Sep 22 15:18:21 2009 for grib_api by
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