@m_adam
Anyway, thanks for your time!

@zipit @m_magalhaes
Thanks for the answers! I figured out how to solve the problem.

@zipit
Hi
I use thread to track the external file. When a file is changed, it is imported.
When using c4d.threading, subprocess.Popen() / time.sleep() freezes C4D ( until the process is complete )

@m_magalhaes @zipit
I use thread to manipulate external pipes(subprocess etc).

Hi.
MODELING_LOOP_TOOL still broken or am I doing something wrong?

import c4d
from c4d import gui, utils

doc = c4d.documents.GetActiveDocument()
obj = doc.GetActiveObject()

bc = c4d.BaseContainer()
bc.SetData(c4d.MDATA_LOOP_SEL_STOP_AT_BOUNDS, True)
bc.SetData(c4d.MDATA_LOOP_SEL_SELECT_BOUNDS, False)
bc.SetData(c4d.MDATA_LOOP_SEL_GREEDY_SEARCH, False)

bc.SetData(c4d.MDATA_LOOP_SELECTION, c4d.SELECTION_NEW)
bc.SetData(c4d.MDATA_LOOP_LOOP_EDGE, 1)  # ? index or ..

utils.SendModelingCommand(command=c4d.ID_MODELING_LOOP_TOOL,
                          list=[obj],
                          mode=c4d.MODELINGCOMMANDMODE_EDGESELECTION,
                          bc=bc,
                          doc=doc,
                          flags=c4d.MODELINGCOMMANDFLAGS_0)

c4d.EventAdd()

Different values ​​give the same loop selection.
Thanks!

@m_magalhaes

here is my code

import c4d
from c4d import utils, documents, plugins

import time
from threading import Thread


class WatchThread(Thread):
    def __init__(self, name, doc):
        Thread.__init__(self, name=name)
        self.doc = doc

    def run(self):
        while True:
            time.sleep(2.5)
            obj_importer(self.doc, r'f:\01.obj')
            print 'Loaded.',
            break


def obj_importer(doc, obj_path):
    if obj_path is None:
        return

    plug = plugins.FindPlugin(1030177, c4d.PLUGINTYPE_SCENELOADER)
    if plug is None:
        return

    op = {}
    if plug.Message(c4d.MSG_RETRIEVEPRIVATEDATA, op):

        if "imexporter" not in op:
            return

        obj_import = op["imexporter"]
        if obj_import is None:
            return

        # Parameters
        obj_import[c4d.OBJIMPORTOPTIONS_POINTTRANSFORM_SWAPXY] = False
        obj_import[c4d.OBJIMPORTOPTIONS_POINTTRANSFORM_SWAPXZ] = False
        obj_import[c4d.OBJIMPORTOPTIONS_POINTTRANSFORM_SWAPYZ] = True

        doc.StartUndo()
        doc.AddUndo(c4d.UNDOTYPE_CHANGE, doc)

        # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

        c4d.documents.MergeDocument(doc, obj_path,
                                    c4d.SCENEFILTER_OBJECTS |
                                    c4d.SCENEFILTER_MATERIALS |
                                    c4d.SCENEFILTER_MERGESCENE, None)

        # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

        doc.EndUndo()

        obj_import[c4d.OBJIMPORTOPTIONS_PRESETS] = 0

    c4d.StatusClear()
    c4d.EventAdd()


if __name__ == '__main__':
    doc = c4d.documents.GetActiveDocument()
    wt = WatchThread('ht', doc)
    wt.start()

@m_magalhaes
No, this solution does not work for me. I am trying to add UNDO when importing an OBJ file.

Hi.
Is it possible to add UNDO for documents.MergeDocument() operation?
I tried this code but it does not work:

doc.StartUndo()

c4d.documents.MergeDocument(doc, obj_path,
                            c4d.SCENEFILTER_OBJECTS |
                            c4d.SCENEFILTER_MATERIALS |
                            c4d.SCENEFILTER_MERGESCENE, None)

c4d.StatusClear()
c4d.EventAdd()

obj = doc.GetActiveObjects(c4d.GETACTIVEOBJECTFLAGS_CHILDREN)[0]
while obj:
    obj = get_next_object(obj)
    doc.AddUndo(c4d.UNDOTYPE_NEW, obj)

doc.EndUndo()

Thanks!

Hi!
Is there any news about SendModelingCommand \ LOOP_TOOL? Still broken?

I asked this question a year ago.
I tried this code, but always got False:

bc = c4d.BaseContainer()
bc[c4d.MDATA_LOOP_SEL_STOP_AT_BOUNDS] = False
bc[c4d.MDATA_LOOP_SEL_SELECT_BOUNDS] = False
bc[c4d.MDATA_LOOP_SEL_GREEDY_SEARCH] = False
bc[c4d.MDATA_LOOP_LOOP_EDGE] = 1 # edge index
bc[c4d.MDATA_LOOP_SELECTION] = c4d.SELECTION_ADD

utils.SendModelingCommand(command=c4d.ID_MODELING_LOOP_TOOL,
                          list=[op],
                          mode=c4d.MODELINGCOMMANDMODE_EDGESELECTION,
                          bc=bc,
                          doc=doc,
                          flags=c4d.MODELINGCOMMANDFLAGS_0)