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EDG: Using IDL_MakeTempStruct() vs. IDL_ImportArray() [message #90204]

Tue, 10 February 2015 14:11

Peter Rodriguez
Messages: 2
Registered: February 2015

Junior Member

Hi,

My objective is to create within C an IDL_TYP_STRUCT to be returned to IDL.

The EDG and Kling's book cover IDL_ImportArray(), but that costs me coding both for the C & IDL_STRUCT_TAG_DEF structures, so that data may be mapped.

I've been successful just using IDL_MakeTempStruct(strIDLdef, 1, &one, &vIDL, IDL_TRUE) having defined my strIDLdef and populating the structure manually via,
char *pIDL=vIDL->value.s.arr->data + IDL_StructTagInfoByName(strIDLdef,(char*)sTAG,IDL_MSG_LONGJM P,&vTAG);
Then employing CASE(vTAG->type) to stride and store within the data space appropriately.

However, upon return to IDL the structure fields are only accessible by index not tagname. Although the in-built tag_names() works!
IDL> o=my_make_struct("blablabla")
IDL> help,o
** Structure <743af8>, 7 tags, length=832, data length=830, refs=1:
sSCAN STRING 'PPI'
iANT_HGT_m INT 320
nSWEEPs LONG 3
fRAYres_deg FLOAT 0.500000
fBINres_km FLOAT 0.250000
fSWEEP_angle_deg_arr
FLOAT Array[40]
sSWEEP_ISO8601_arr
STRING Array[40]
IDL> help,o.sSCAN
% Tag name SSCAN is undefined for structure <Anonymous>.
% Execution halted at: $MAIN$
IDL> help,o.(0)
<Expression> STRING = 'PPI'
IDL> print,tag_names(o)
sSCAN iANT_HGT_m nSWEEPs fRAYres_deg fBINres_km fSWEEP_angle_deg_arr sSWEEP_ISO8601_arr

So as a work-around, I've written am IDL wrapper to rebuild/copy the structure based on determining the SIZE(/TYPE) of each field.

Does anyone have insight, how in C may I manually set each structure tagname string? The magic that IDL_ImportArray() apparently does... Something along the lines of tweaking vIDL->value.s.sdef I surmise because from the EDG "the implementation of structure definitions is not public information".

Thanks, Peter Rodriguez

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[Message index]

		EDG: Using IDL_MakeTempStruct() vs. IDL_ImportArray() By: Peter Rodriguez on Tue, 10 February 2015 14:11
		Re: EDG: Using IDL_MakeTempStruct() vs. IDL_ImportArray() By: chris_torrence@NOSPAM on Tue, 10 February 2015 14:30
		Re: EDG: Using IDL_MakeTempStruct() vs. IDL_ImportArray() By: Jim Pendleton on Tue, 10 February 2015 16:30
		Re: EDG: Using IDL_MakeTempStruct() vs. IDL_ImportArray() By: Peter Rodriguez on Thu, 12 February 2015 09:05

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