void
demoIO(char *filename)
{
char me[]="demoIO", newname[]="foo.nrrd", *err, *key, *val;
int kvn, kvi;
Nrrd *nin;
/* create a nrrd; at this point this is just an empty container */
nin = nrrdNew();
/* read in the nrrd from file */
if (nrrdLoad(nin, filename, NULL))
{
err = biffGetDone(NRRD);
fprintf(stderr, "%s: trouble reading \"%s\":\n%s", me, filename, err);
free(err);
return;
}
/* say something about the array */
printf("%s: \"%s\" is a %d-dimensional nrrd of type %d (%s)\n",
me, filename, nin->dim, nin->type,
airEnumStr(nrrdType, nin->type));
printf("%s: the array contains %d elements, each %d bytes in size\n",
me, (int)nrrdElementNumber(nin), (int)nrrdElementSize(nin));
/* print out the key/value pairs present */
kvn = nrrdKeyValueSize(nin);
if (kvn)
{
for (kvi=0; kvi<kvn; kvi++)
{
nrrdKeyValueIndex(nin, &key, &val, kvi);
printf("%s: key:value %d = %s:%s\n", me, kvi, key, val);
free(key);
free(val);
key = val = NULL;
}
}
/* modify key/value pairs, and write out the nrrd to a different file */
nrrdKeyValueClear(nin);
nrrdKeyValueAdd(nin, "new key", "precious value");
if (nrrdSave(newname, nin, NULL))
{
err = biffGetDone(NRRD);
fprintf(stderr, "%s: trouble writing \"%s\":\n%s", me, newname, err);
free(err);
return;
}
/* blow away both the Nrrd struct *and* the memory at nin->data
(nrrdNix() frees the struct but not the data,
nrrdEmpty() frees the data but not the struct) */
nrrdNuke(nin);
return;
}
/*
** we try to use the oldest format that will hold the nrrd
*/
int
_nrrdFormatNRRD_whichVersion(const Nrrd *nrrd, NrrdIoState *nio) {
int ret;
if (_nrrdFieldInteresting(nrrd, nio, nrrdField_measurement_frame)) {
ret = 5;
} else if (_nrrdFieldInteresting(nrrd, nio, nrrdField_thicknesses)
|| _nrrdFieldInteresting(nrrd, nio, nrrdField_space)
|| _nrrdFieldInteresting(nrrd, nio, nrrdField_space_dimension)
|| _nrrdFieldInteresting(nrrd, nio, nrrdField_sample_units)
|| airStrlen(nio->dataFNFormat) || nio->dataFNArr->len > 1) {
ret = 4;
} else if (_nrrdFieldInteresting(nrrd, nio, nrrdField_kinds)) {
ret = 3;
} else if (nrrdKeyValueSize(nrrd)) {
ret = 2;
} else {
ret = 1;
}
return ret;
}
