int codes_index_get_size(grib_index* index,const char* key,size_t* size)
{
return grib_index_get_size(index,key,size);
}
int main(int argc,char* argv[])
{
grib_index* index=NULL;
grib_handle* h=NULL;
long *step,*level,*number;
char** shortName=NULL;
int i,j,k,l;
size_t stepSize,levelSize,shortNameSize,numberSize;
long ostep,olevel,onumber;
char oshortName[200];
size_t lenshortName=200;
int ret=0,count=0;
if (argc != 2) usage(argv[0]);
printf("indexing...\n");
index=grib_index_read(0,"out.gribidx",&ret);
GRIB_CHECK(ret,0);
printf("end indexing...\n");
/* get the number of distinct values of "step" in the index */
GRIB_CHECK(grib_index_get_size(index,"step",&stepSize),0);
step=(long*)malloc(sizeof(long)*stepSize);
if (!step) exit(1);
/* get the list of distinct steps from the index */
/* the list is in ascending order */
GRIB_CHECK(grib_index_get_long(index,"step",step,&stepSize),0);
printf("stepSize=%ld\n",(long)stepSize);
for (i=0;i<stepSize;i++) printf("%ld ",step[i]);
printf("\n");
/*same as for "step"*/
GRIB_CHECK(grib_index_get_size(index,"level",&levelSize),0);
level=(long*)malloc(sizeof(long)*levelSize);
if (!level) exit(1);
/*same as for "step"*/
GRIB_CHECK(grib_index_get_long(index,"level",level,&levelSize),0);
printf("levelSize=%ld\n",(long)levelSize);
for (i=0;i<levelSize;i++) printf("%ld ",level[i]);
printf("\n");
/*same as for "step"*/
GRIB_CHECK(grib_index_get_size(index,"number",&numberSize),0);
number=(long*)malloc(sizeof(long)*numberSize);
if (!number) exit(1);
/*same as for "step"*/
GRIB_CHECK(grib_index_get_long(index,"number",number,&numberSize),0);
printf("numberSize=%ld\n",(long)numberSize);
for (i=0;i<numberSize;i++) printf("%ld ",number[i]);
printf("\n");
/*same as for "step"*/
GRIB_CHECK(grib_index_get_size(index,"shortName",&shortNameSize),0);
shortName=(char**)malloc(sizeof(char*)*shortNameSize);
if (!shortName) exit(1);
/*same as for "step"*/
GRIB_CHECK(grib_index_get_string(index,"shortName",shortName,&shortNameSize),0);
printf("shortNameSize=%ld\n",(long)shortNameSize);
for (i=0;i<shortNameSize;i++) printf("%s ",shortName[i]);
printf("\n");
count=0;
/* nested loops on the keys values of the index */
/* different order of the nested loops doesn't affect performance*/
for (i=0;i<shortNameSize;i++) {
/* select the grib with shortName=shortName[i] */
grib_index_select_string(index,"shortName",shortName[i]);
for (l=0;l<levelSize;l++) {
/* select the grib with level=level[i] */
grib_index_select_long(index,"level",level[l]);
for (j=0;j<numberSize;j++) {
/* select the grib with number=number[i] */
grib_index_select_long(index,"number",number[j]);
for (k=0;k<stepSize;k++) {
/* select the grib with step=step[i] */
grib_index_select_long(index,"step",step[k]);
/* create a new grib_handle from the index with the constraints
imposed by the select statements. It is a loop because
in the index there could be more than one grib with those
constrants */
while ((h=grib_handle_new_from_index(index,&ret))!=NULL){
count++;
if (ret) {printf("error: %d\n",ret); exit(ret);}
lenshortName=200;
grib_get_string(h,"shortName",oshortName,&lenshortName);
grib_get_long(h,"level",&olevel);
grib_get_long(h,"number",&onumber);
grib_get_long(h,"step",&ostep);
printf("shortName=%s ",oshortName);
printf("level=%ld ",olevel);
printf("number=%ld ",onumber);
printf("step=%ld \n",ostep);
grib_handle_delete(h);
}
if (ret!=GRIB_END_OF_INDEX) {printf("error: %s\n",grib_get_error_message(ret)); exit(ret);}
}
}
}
}
printf(" %d messages selected\n",count);
return 0;
}
