File conversion JSON to DWG using dwgwrite.exe

[danikolovv]

Hello everyone,

When I navigate to the route, where dwgwrite.exe is located and run it through cmd using this input of commands:

<file path>dwgwrite -v9 -y --as r2000 -I JSON "D:\\TestJsonExportDWG.dwg" "D:\\output.json"

All runs smoothly until it gets to reading "OBJECTS" from JSON file format.

For each object into the JSON file (currently 2 objects within) the following error is outputted:

ERROR: Required POINT.handle missing, skipped

And after I added "handle" and "ownerhandle" consisting of an array of [0, 0, 0] this error appeared:

ERROR: Unexpected UNDEFINED at 965 of 965 tokens, expected OBJECTS OBJECT. json_OBJECTS:3083

Followed by these two informative lines:

Skip JSON UNDEFINED  at 965 of 965 tokens
End of OBJECTS (hard error)

And finally, these are outputted:

ERROR 0x800

Critical: INVALIDDWG

I am generating a JSON using RapidJSON. Currently only the "FILEHEADER" and "HEADER" are borrowed from a JSON exported by LibreDWG. The idea here is to implement the header encryption of the JSON file, so it can then successfully be converted to a DWG file format.

If you need more specifics of the error, please let me know.

Regards,
Daniel Nikolov

[rurban]

You really need to understand the DWG format to be able to create something from scratch as with JSON.

Better take existing entities and objects exported to JSON.
It is much easier to use the dwg_add API, as used in dwgadd

[danikolovv]

Hello,

I understand that dwgadd.exe may be easier to use, but it uses a command sheet, which is something that I don't quite want to implement as a part of a bigger application.
When I need to export a DWG file I will have to take points from JSON, make a command sheet and run it with dwgadd.exe to create a DWG. This process have to be shortened.

For that reason, I ask you is there a way using LibreDWG to create a DWG file exporting / coordinates / from (for example) JSON, excluding the new command sheet generated every time for applied usage of dwgadd.exe?

[rurban]

No, dwgadd is an example how to use the add API, if you don't know exactly how entities and objects need to be created to be valid

[danikolovv]

Hello, I executed dwgadd.exe with this command line, using cmd:

dwgadd -v9 --as r2000 -o "D:\newDWG.dwg" "D:\dwgadd.example_1"

Here dwgadd.example_1 represents a file consisting of commands as described in the dwgadd.5.

When I type

readjson "D:\export.json"

Into the dwgadd.example_1 I receive this error after execution of dwgadd.exe

readjson seen, but DWG already exists

Isn't this the way to take information from JSON and convert it to a DWG file?

Also when I create a DWG file and try to open it with Autodesk DWG TrueView 2025 I get this error

Drawing file was created by an incompatible version.

And let me choose another file to open.