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<div class="moz-cite-prefix">Le 12/05/2025 à 01:04, Joaquim Manuel
Freire Luís via gdal-dev a écrit :<br>
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cite="mid:AM6PR04MB6440581BDF29BCED52E44FD7A694A@AM6PR04MB6440.eurprd04.prod.outlook.com">
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<p class="MsoNormal"><span lang="PT">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT"><o:p> </o:p></span></p>
<p class="MsoNormal">I’m afraid this one is not going to be
easy, and I don’t know how much help I can provide to find the
issue. The think is that
<a href="https://github.com/OSGeo/gdal/pull/12124"
moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/OSGeo/gdal/pull/12124</a>
(which is a very big PR) broke my Julia wrapper.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For example, this used to write a png image
but now it errors with<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">julia> gdalwrite("lixo.png",
mat2img(UInt8.([1 2 3; 4 5 6; 7 8 9])))<o:p></o:p></p>
<p class="MsoNormal">ERROR 1: Cannot guess driver for lixo.png<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But maybe more concrete is this failure
where it tries to extract info from a gdal dataset (a pointer
)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><br>
Gdal.GDALGetRasterYSize(dataset.ptr)<o:p></o:p></p>
<p class="MsoNormal">49<o:p></o:p></p>
<p class="MsoNormal">Gdal.GDALGetRasterCount(dataset.ptr)<o:p></o:p></p>
<p class="MsoNormal">1<o:p></o:p></p>
<p class="MsoNormal">Gdal.GDALDatasetGetLayerCount(dataset.ptr)<o:p></o:p></p>
<p class="MsoNormal">0<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here, first two are correct be the third is
now wrong.</p>
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<p>Why is GDALDatasetGetLayerCount() == 0 wrong on a raster dataset
? It looks like the expected result</p>
<p>If I'm looking at the correct source code
<a class="moz-txt-link-freetext" href="https://github.com/GenericMappingTools/GMT.jl/blob/94649db2b48d3223c8b8628b6fac4d3df60b8938/src/gdal_utils.jl#L859">https://github.com/GenericMappingTools/GMT.jl/blob/94649db2b48d3223c8b8628b6fac4d3df60b8938/src/gdal_utils.jl#L859</a>
, then this line is fragile. Rather than testing if
OGRGetDriverByName() returns a non null pointer to guess if that
dataset is raster or vector, you could indeed test
GDALGetRasterCount() != 0 to infer this is a raster dataset.</p>
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<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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