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<div class="moz-cite-prefix">Le 02/10/2023 à 17:23, Abel Pau a
écrit :<br>
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<blockquote type="cite"
cite="mid:AM8PR07MB8170AF0B8B03FE1650A11FA0A2C5A@AM8PR07MB8170.eurprd07.prod.outlook.com">
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<p class="MsoNormal"><span style="color:#1F497D" lang="ES">Thanks
Even,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="ES"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">that
it’s not so bad. I can “wait” until ICreateFeature and if
it’s the first feature create the number of fields it has.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">But,
then, what happens with other fields that can appear after
in next features? I might ignore them, but... it’s not a
good thing.
</span></p>
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</blockquote>
Just look at existing drivers, like the JML one I pointed. They will
error out when attempting to call CreateField() once a feature has
been written, and they will stop advertizing the OLCCreateField
capability as well.<br>
<blockquote type="cite"
cite="mid:AM8PR07MB8170AF0B8B03FE1650A11FA0A2C5A@AM8PR07MB8170.eurprd07.prod.outlook.com">
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Can
they appear later or not? I haven’t understood it at
complete.</span></p>
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<p>Calling CreateField() at any time is a possibility of the OGR
API. That doesn't mean that all drivers have to support it. Most
writers will generally create all needed fields before writing
features, if they can, to be compatible with as many output
drivers as possible.<br>
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<br>
<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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