detect that c4d is running

On 07/03/2017 at 08:56, xxxxxxxx wrote:

i got a script which starts a thread in the background using c4d.threading.C4DThread.

if i close my c4d application the thread stays active and c4d do not close completly ( taskmanager > cinema4d.exe )

i try to use C4DThread.TestBreak() but i guess that might be the wrong way to do this.

On 07/03/2017 at 09:05, xxxxxxxx wrote:

TestBreak and TestDBreak just return a state you have to quit your thread manually.

On 07/03/2017 at 09:22, xxxxxxxx wrote:

exp.

  
   while True:
                              
                if self.TestBreak() :
                    c4d.StopAllThreads()
                    break
  

On 07/03/2017 at 09:33, xxxxxxxx wrote:

https://plugincafe.maxon.net/topic/9808/13204_what-exactly-does-stopallthreads-do&PID=52236#52236

Normally you don't need to call StopAllThread.
Morre safe could be to make a return instead of break or even do
self.End()

On 07/03/2017 at 10:09, xxxxxxxx wrote:

 if self.TestBreak() :
           
                    self.End()

On 08/03/2017 at 02:37, xxxxxxxx wrote:

Hi,

I'm not sure, if you try to use a thread from a Python script (in the following I use the term script only for code called from the Script Manager) or from a Python plugin (like CommandData).

In general it's not a good idea to create a thread from inside a script. The thing is, who owns the thread after the script is finished. Even if using a global variable, we have nowhere documented, what happens to global variables after a script finished (for good reason). So the behavior is already undocumented. But what happens, if the script is run for a second time. If not before, at least at this point, nobody will be storing a reference to this thread anymore, as the script will overwrite the globals.

The better way to do something like this, is to implement a CommandData plugin (other types might work as well, depending on your needs and actual use-case). There you have a "resident" class, which can host the thread (i.E. store a reference to the thread in a member variable). And then you can also implement PluginMessage() in order to react to Cinema quitting.

Just for completeness for future readers:
In Python docs: Threading, BaseThread
In C++ docs there are manuals on different areas of threading and Plugin Functions (like PluginMessage())