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<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>Hi
all,</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>I'm somewhat at
wit's end with this problem and am really only fishing for
ideas.</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>The problem occurs
when releasing the DataSource for an ESRI Shape file after getting its spatial
reference. The same code works fine with MapInfo files.</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>My code is very
simple in this case and only occurs when running as part of a ASP.NET web site.
If I strip out any content it still fails. This same code works fine in a simple
console app, as well as running the exact same library code using NUnit tests.
But other than the usual ASP.NET page lifecycle stuff, there isn't anything else
happening with unmanaged code such as GDAL/OGR that could be fingered as a
memory overrun culprit.</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007><FONT color=#0000ff size=2> </DIV>
<DIV><FONT face=Arial color=#000000>using</FONT></FONT><FONT face=Arial><FONT
size=2> (</FONT><FONT size=2>DataSource</FONT><FONT size=2> ds = </FONT><FONT
size=2>Ogr</FONT></FONT><FONT size=2>.OpenShared(fileName, 0))</FONT></DIV>
<DIV><FONT size=2>{</FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><FONT color=#0000ff><SPAN
class=968074620-27092007><FONT face="Times New Roman"
color=#000000> </FONT></SPAN>using</FONT> (<FONT
color=#2b91af>Layer</FONT></FONT><FONT face=Arial> layer =
ds.GetLayerByIndex(0))</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968074620-27092007> </SPAN>{</FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><FONT color=#0000ff><SPAN
class=968074620-27092007>
</SPAN>using</FONT> (<FONT color=#2b91af>SpatialReference</FONT></FONT><FONT
face=Arial> srs = layer.GetSpatialRef())</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968074620-27092007>
</SPAN>{</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=968074620-27092007><FONT
color=#0000ff>
</FONT></SPAN>}</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968074620-27092007> </SPAN>}</FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2>}<SPAN class=968074620-27092007>
<--- exception occurs here (or on Dispose if I explicitly call
it)</SPAN></FONT></FONT></DIV>
<DIV>
<P><FONT size=2></FONT> </P></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>Using an point
file:</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007>[AccessViolationException: Attempted to read
or write protected memory. This is often an indication that other memory is
corrupt.]<BR> OSGeo.OGR.OgrPINVOKE.delete_DataSource(HandleRef
jarg1) +0<BR> OSGeo.OGR.DataSource.Dispose() +191<BR></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>Using a polygon
shape file (converted from a MapInfo tab file using ogr2ogr) I get the
following:</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007>[OverflowException: Arithmetic operation
resulted in an overflow.]<BR>
OSGeo.OGR.OgrPINVOKE.delete_DataSource(HandleRef jarg1) +0<BR>
OSGeo.OGR.DataSource.Dispose() +191<BR></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>In both cases, the
Wrapper.Name is corrupted - the first few characters in the file path are
garbage. I guess this is the symptom of the problem, but I can't guess at the
root cause. The handle is not null and otherwise looks fine.</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>My next step is try
to reproduce with a basic no-content ASP.NET web site.</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial size=2>Any ideas are
welcome.</FONT></SPAN></DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968074620-27092007><FONT face=Arial
size=2>Richard</FONT></SPAN></DIV></BODY></HTML>