Re: [gdal-dev] VRT dataset to text in-memory?
Excellent, Even - thanks so much, I have this working now. I've crafted a
PR for the example.
Mateusz: thank you for the source code overview, I will be using that too.
Best, Mike
On Sun, Mar 6, 2022 at 10:18 PM Even Rouault
wrote:
> Michael,
>
> yes you can get the VRT XML text with:
>
> poVRTDS->GetMetadata("xml:VRT")[0]
>
> If you can submit a pull request documenting that, that would be welcome
>
> Even
> Le 03/03/2022 à 11:14, Michael Sumner a écrit :
>
> Hello, reading the raster VRT tutorial
>
> https://gdal.org/drivers/raster/vrt.html#creation-of-vrt-datasets
>
> with this code:
>
> //
> int nBand;
> GDALDriver *poDriver = (GDALDriver *) GDALGetDriverByName( "VRT" );
> GDALDataset *poSrcDS, *poVRTDS;
> poSrcDS = (GDALDataset *) GDALOpenShared( pszSourceFilename, GA_ReadOnly );
> poVRTDS = poDriver->CreateCopy( "", poSrcDS, FALSE, NULL, NULL, NULL );
> //
>
> Is there a way to obtained the VRT XML text representing poVRTDS without
> writing to an actual file?
>
> Sorry if this is obvious, haven't been able to find an example that does
> what I want. I've seen examples using GetMetadataItem from a band for parts
> of the XML, but can't see how to get the entire thing.
>
> Thanks for your help.
>
> Best, Mike
>
>
> --
> Michael Sumner
> Software and Database Engineer
> Australian Antarctic Division
> Hobart, Australia
> e-mail: mdsum...@gmail.com
>
> ___
> gdal-dev mailing
> listgdal-dev@lists.osgeo.orghttps://lists.osgeo.org/mailman/listinfo/gdal-dev
>
> -- http://www.spatialys.com
> My software is free, but my time generally not.
>
>
--
Michael Sumner
Software and Database Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsum...@gmail.com
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Re: [gdal-dev] VRT dataset to text in-memory?
Michael,
yes you can get the VRT XML text with:
poVRTDS->GetMetadata("xml:VRT")[0]
If you can submit a pull request documenting that, that would be welcome
Even
Le 03/03/2022 à 11:14, Michael Sumner a écrit :
Hello, reading the raster VRT tutorial
https://gdal.org/drivers/raster/vrt.html#creation-of-vrt-datasets
with this code:
//
int nBand;
GDALDriver *poDriver = (GDALDriver *) GDALGetDriverByName( "VRT" );
GDALDataset *poSrcDS, *poVRTDS;
poSrcDS = (GDALDataset *) GDALOpenShared( pszSourceFilename,
GA_ReadOnly );
poVRTDS = poDriver->CreateCopy( "", poSrcDS, FALSE, NULL, NULL, NULL );
//
Is there a way to obtained the VRT XML text representing poVRTDS
without writing to an actual file?
Sorry if this is obvious, haven't been able to find an example that
does what I want. I've seen examples using GetMetadataItem from a band
for parts of the XML, but can't see how to get the entire thing.
Thanks for your help.
Best, Mike
--
Michael Sumner
Software and Database Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsum...@gmail.com
___
gdal-dev mailing list
gdal-dev@lists.osgeo.org
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--
http://www.spatialys.com
My software is free, but my time generally not.
___
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Re: [gdal-dev] VRT dataset to text in-memory?
On Thu, 3 Mar 2022 at 11:16, Michael Sumner wrote: > > Hello, reading the raster VRT tutorial > > https://gdal.org/drivers/raster/vrt.html#creation-of-vrt-datasets > > with this code: > > // > int nBand; > GDALDriver *poDriver = (GDALDriver *) GDALGetDriverByName( "VRT" ); > GDALDataset *poSrcDS, *poVRTDS; > poSrcDS = (GDALDataset *) GDALOpenShared( pszSourceFilename, GA_ReadOnly ); > poVRTDS = poDriver->CreateCopy( "", poSrcDS, FALSE, NULL, NULL, NULL ); > // > > Is there a way to obtained the VRT XML text representing poVRTDS without > writing to an actual file? Check what the https://gdal.org/programs/gdalbuildvrt.html does: https://github.com/OSGeo/gdal/blob/master/apps/gdalbuildvrt_bin.cpp#L192-L196 which is this call https://github.com/OSGeo/gdal/blob/master/apps/gdalbuildvrt_lib.cpp#L1691 which uses this builder class https://github.com/OSGeo/gdal/blob/master/apps/gdalbuildvrt_lib.cpp#L1769 which is/can be built as a library and linked against. Best regards, -- Mateusz Loskot, http://mateusz.loskot.net ___ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
[gdal-dev] VRT dataset to text in-memory?
Hello, reading the raster VRT tutorial https://gdal.org/drivers/raster/vrt.html#creation-of-vrt-datasets with this code: // int nBand; GDALDriver *poDriver = (GDALDriver *) GDALGetDriverByName( "VRT" ); GDALDataset *poSrcDS, *poVRTDS; poSrcDS = (GDALDataset *) GDALOpenShared( pszSourceFilename, GA_ReadOnly ); poVRTDS = poDriver->CreateCopy( "", poSrcDS, FALSE, NULL, NULL, NULL ); // Is there a way to obtained the VRT XML text representing poVRTDS without writing to an actual file? Sorry if this is obvious, haven't been able to find an example that does what I want. I've seen examples using GetMetadataItem from a band for parts of the XML, but can't see how to get the entire thing. Thanks for your help. Best, Mike -- Michael Sumner Software and Database Engineer Australian Antarctic Division Hobart, Australia e-mail: mdsum...@gmail.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
