Hi GDAL devs,
I have a need to open the same set of Shapefiles as two independent datasets,
BOTH of which are READ ONLY. However, when I do this, and attempt to get the
number of layers in the second data set, I get a whole lot of errors of the
form:
ERROR 4: Failed to open file <shapefile>.shp.
It may be corrupt or read-only file accessed in update mode.
...for most (but not all) of the layers, and of course the dataset is
incomplete and not useful.
I've crafted the following very simple example of this problem:
OGRDataSourceH firstDS = OGROpen(path, FALSE, NULL);
OGRDataSourceH secondDS = OGROpen(path, FALSE, NULL);
OGR_DS_GetLayerCount(firstDS); // THIS LINE WORKS FINE
OGR_DS_GetLayerCount(secondDS); // THIS LINE PRODUCES MANY
ERRORS
If I OGR_DS_Destroy the first data set before running the OGR_DS_GetLayerCount
on the second data set it works fine.
Is this expected?
I really need to have both datasets readable and useable simultaneously as they
are both in completely independent parts of the application. The first data
set should be long-lived and needs to be persistent before, during and after
the entire short life-cycle of the second data set.
The error messages imply that it is either corrupt or accessed in update mode.
But clearly it is not corrupt (at the file level) because it works fine in the
first data set (and in the second if the first data set is destroyed first).
It is also being explicitly opened in READ-ONLY mode in both cases and
therefore should not be in update mode.
I'm using gdal-1.10.1.
Any advice would be very much appreciated.
Cheers,
Nik.
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