[fdo-users] RE: Fgf to Wkb

[Greg Boone]

NOTE: Even though the managed API is simply a wrapper around the unmanaged C++ API, the managed API's retrieval of the FGF byte array using GetGeometry() will always be slower than experienced using the unmanaged API directly. This is due to the fact that the underlying unmanaged FGF geometry cannot be referenced by const pointer as it could be in the case of unmanaged C++, but has to be copied to the managed byte array for return. So, the user always gets a copy of the byte array geometry rather than a reference to it.

Greg

-----Original Message-----
From: fdo-users-bounces at lists.osgeo.org [mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of Gavin Cramer
Sent: Monday, December 20, 2010 3:37 PM
To: FDO Users Mail List
Subject: RE: [fdo-users] RE: Fgf to Wkb

That does not sound right at all.  While using the FdoGeometry types won't be quite as fast as a direct binary conversion, I do not know of a reason for it to have anywhere near the performance problems that you report.

It sounds like there could be up to two problems:  fetching the geometry in FGF and converting the geometry to WKB.  The first one should be a direct binary conversion and even that is having a problem in this case.

If it is possible to share any of the data involved, I recommend filing an FDO defect so that it can be formally analysed and addressed.

Gavin


-----Original Message-----
From: fdo-users-bounces at lists.osgeo.org [mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of maland
Sent: Monday, December 20, 2010 3:33 PM
To: fdo-users at lists.osgeo.org
Subject: [fdo-users] RE: Fgf to Wkb


WKB byte array can be used to render the geometry.

We are a bit concerned about the performance of the FDO. For the specific
geometry referred to in this post, even this call to GetGeometry need 3-4
seconds to complete: 
byte[] fgfBytes = reader.GetGeometry(p.Name);

We are using the OSGeo.ArcSDE provider.

Henning
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