[Gdal-dev] Calling GDAL functions in IDL

[Frank Warmerdam]

Gagan Tandon wrote:
> Hi all,
> 
> Thanks to Norman and Frank for their response.
> 
> I read in the IDL user manual on how to call external functions. It says 
> that if the external library is packaged as a DLL then one can register 
> the DLL (using regsvr32) and wrap the COM object into an IDL object and 
> use it from there. I thought gdal11.dll was the one I should be looking 
> for. I tried registering the DLL, it threw an error that No 
> DLLRegistryServer entry point found, Registration failed.  I guess I am 
> using the wrong DLL or there is some other kind of library that allows 
> me access to all the GDAL methods.  I would appreciate if somebody could 
> provide leads on this.
> 
> I am using windows XP, IDL 6.0. I do not wish to use 
> python/numarray/numeric etc. I want to build the software that is python 
> independent. Do I need to build the GDAL again? (since I am using the 
> GDAL that was built "with" python support)

Gagan,

GDAL does not provide a COM interface in it's DLL, so there is no support
for registering it.  However, if IDL provided a means to call out to
C functions in a DLL (many scripting environments have ways of doing this
- vb does for instance) then you might be able to accomplish what you
want from IDL.  Alternatively, you could prepare a small COM wrapper for
the services you need and utilize that, but COM isn't my speciality.

Good luck,
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