[gdal-dev] the /vsistdout mistery and the Update question

[Abel Pau]

Hi,
after reading https://gdal.org/user/virtual_file_systems.html#vsistdout-standard-output-streaming I have to say I don't understand what it means.

I which cases it's used? Some example to consider?
In the driver I have to do something with that?

I have, copied from other,
if (!STARTS_WITH(pszFilename, "/vsistdout")) and then I open the file as usual.
But, what I have to do if the name starts with that?


On the other hand, I am confused about the Update concept.
My driver is capable of creating from zero a layer from other formats.
But I haven't programmed the capacity to insert a feature in a pre-existent layer (I cannot simply add at the end of the file because de format description is a little more complicated).

What I do now is

OGRMiraMonLayer() <-- if Update is true, I open from zero and create a new MiraMon layer
If not, I read the layer.

But, there is something to take in consideration about the capacity of inserting a feature in a pre-existent layer?

Thanks.

Abel Pau Garcia
GIS developer
[https://www.creaf.cat/sites/default/files/creaf-signature.png]
a.pau at creaf.uab.cat<mailto:a.pau at creaf.uab.cat>
Let's chat on Teams!<https://teams.microsoft.com/l/chat/0/0?users=a.pau@creaf.uab.cat>
Tel. +34 934814277
[https://www.creaf.cat/sites/default/files/so-en-signature.png]
[https://www.creaf.cat/sites/default/files/twitter-icon-signature.png]<https://twitter.com/CREAF_ecologia>[https://www.creaf.cat/sites/default/files/linkedin-icon-signature.png]<https://www.linkedin.com/company/1363052?trk=tyah&trkInfo=clickedVertical:company,clickedEntityId:1363052,idx:2-1-2,tarId:1465807877789,tas:creaf>[https://www.creaf.cat/sites/default/files/youtube-icon-signature.png]<https://www.youtube.com/c/creafecologia>[https://www.creaf.cat/sites/default/files/instagram-icon-signature.png]<https://www.instagram.com/CREAF_ecologia/>
www.creaf.cat<http://www.creaf.cat> | http://blog.creaf.cat
[https://www.creaf.cat/sites/default/files/uab_logo_signatura.png]
CREAF. Campus UAB. Edifici C. 08193 Bellaterra (Barcelona)

Before printing this electronic message, think about the environment.



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 3657 bytes
Desc: image001.png
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0006.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 2547 bytes
Desc: image002.png
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0007.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 505 bytes
Desc: image003.png
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0008.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.png
Type: image/png
Size: 446 bytes
Desc: image004.png
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0009.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 553 bytes
Desc: image005.png
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0010.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image006.png
Type: image/png
Size: 582 bytes
Desc: image006.png
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0011.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image007.jpg
Type: image/jpeg
Size: 2208 bytes
Desc: image007.jpg
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image008.jpg
Type: image/jpeg
Size: 1111 bytes
Desc: image008.jpg
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240223/70acd99e/attachment-0003.jpg>