How to write a new layer to the current dwg

[yingyue4008]

I first read the data of dwg, and then created a new layer, but I crashed when writing dwg, so I don't know how to write the newly created layer?

[rurban]

How did you create the new layer? It should be done with dwg_add_LAYER()

[yingyue4008]

I use dwg_ add_ LAYER(), but the parameter Dwg_ Data * restrict dwg cannot be obtained from readdwg, but only through dwg_ add_ Document function add Dwg_ Data, and I want to use readdwg's Dwg_ Data

[yingyue4008]

Yes, you need to use dwg from your readdwg

Excuse me, it is still impossible to write the new layer into the read dwg. Is this the right way?

[rurban]

Yes

[yingyue4008]

Yes
Then how should I use it? Hope to be prompted

[rurban]

https://github.com/LibreDWG/libredwg/blob/master/examples/load_dwg.c has such an example how to read a DWG and then add something

[yingyue4008]

https://github.com/LibreDWG/libredwg/blob/master/examples/load_dwg.c has such an example how to read a DWG and then add something

This logic is only read, and does not add data in the original dwg drawing. Please help me see if this is the case

[rurban]

I've updated https://github.com/LibreDWG/libredwg/blob/smoke/load_dwg/examples/load_dwg.c to show how to load, check, add a text to a dwg. Similar for a layer.
examples/dwgadd.c has a command to add a layer also.

[rurban]

Then you add a new layer, and use this layer handle on the LINE.

[yingyue4008]

Then you add a new layer, and use this layer handle on the LINE.

Hello,Do you need to call a transaction after creating a new layer?

[yingyue4008]

Then you add a new layer, and use this layer handle on the LINE.

Debugging found that the new layer ->xref is empty. How to set xref?

[yingyue4008]

Then you add a new layer, and use this layer handle on the LINE.
Hello, excuse me, I haven't replaced the correct layer at present. I still don't know how to use the layer handle to give the line

[yingyue4008]

Excuse me, at present, this layer replacement has not been successful. I don't know if it is the reason for my incorrect operation