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This code was developed from another question I posted about how to kill an arcpy tool if it takes longer than a specified time. See How to cancel tool execution in python. Using the multiprocssing module as a subprocess of the function seems to work, the only problem is i can't see how to write the output to disk. The function specifies a path to write the data to, and when I run the function without the subprocess, I can see the files on disk. But when the subprocess is included it doesn't look the files are being written out to disk. Can anyone help?

import os, arcpy, arcgisscripting, time, sys
gp = arcgisscripting.create()

def ConvertCADtoGDB(in_dgn,out_gdb):
    gp.ImportCAD_conversion(in_dgn,out_gdb,'','Explode_Complex')
    if not arcpy.Exists(out_gdb):raise RuntimeError('%s does not exist'%out_gdb)

def main(srch_dir,gdb_dir,timeout):
    for dirpath, dirnames, files in os.walk(srch_dir):
        for f in files:
            f_name, f_ext = os.path.splitext(f)
            in_dgn = os.path.join(dirpath,f)
            out_gdb = os.path.join(gdb_dir,f_name+'.gdb')
            if f_ext == '.dgn':
                if not os.path.isdir(out_gdb):
                    print 'creating',out_gdb
                    #####################################################
                    # Create a separate process to run the tool in
                    p = multiprocessing.Process(target=ConvertCADtoGDB,
                                            args=(in_dgn,out_gdb))
                    p.start()
                    p.join(timeout)   # Wait for process to complete
                    if p.is_alive():  # Terminate process if it is 
                        p.terminate() # still running after the timeout
                        print('Conversion of %s terminated'%in_dgn)
                    else:
                        print('Conversion of %s successful'%in_dgn)
                    #####################################################

if __name__ == '__main__':
    srch_dir=r'C:\Temp\dgns'
    gdb_dir=r'C:\Temp\gdbs'
    timeout=5 #Seconds
    main(srch_dir,gdb_dir,timeout)

UPDATE:

I tested Luke's code, and the message I receive tellS me the process was successful, but still I get nothing written out to disk:

import os, arcpy, arcgisscripting, time, sys
from multiprocessing import Process
from multiprocessing.queues import SimpleQueue
copy_dir = r'D:\test3'
gdb_dir = copy_dir+'\\'+'CAD_Export_to_GDB'

def ConvertCADtoGDB(msgs,in_dgn,out_gdb):
    try:
        gp = arcgisscripting.create()
        gp.ImportCAD_conversion(in_dgn,out_gdb,'','Explode_Complex')
        if not arcpy.Exists(out_gdb):raise RuntimeError('%s does not exist'%out_gdb)
        msgs.put(gp.GetMessages())
    except Exception as err:
        msgs.put(gp.GetMessages())
        msgs.put(err)

def main(srch_dir,gdb_dir,timeout):
    for dirpath, dirnames, files in os.walk(srch_dir):
        for f in files:
            f_name, f_ext = os.path.splitext(f)
            in_dgn = os.path.join(dirpath,f)
            out_gdb = os.path.join(gdb_dir,f_name+'.gdb')
            if f_ext == '.dgn':
                if not os.path.isdir(out_gdb):
                    print 'creating',out_gdb
                    #####################################################
                    # Create a separate process to run the tool in
                    # and a Queue to pass messages back
                    m = SimpleQueue()
                    p = Process(target=ConvertCADtoGDB,
                                   args=(m,in_dgn,out_gdb))
                    p.start()
                    p.join(timeout)   # Wait for process to complete
                    err = None
                    while not m.empty(): # Check if messages in queue
                        msg = m.get()
                        if isinstance(msg, Exception):err= msg
                        else: print msg
                    if p.is_alive():  # Terminate process if it is
                        p.terminate() # still running after the timeout
                        print('terminated')
                    elif err:
                        print('unsuccessful: %s'%err)
                    else:
                        print('successful')
                    #####################################################

if __name__ == '__main__':
    srch_dir=r'C:\Temp\dgns'
    gdb_dir=r'C:\Temp\gdbs'
    timeout=60 #Seconds
    main(copy_dir,gdb_dir,timeout)
  • 4
    I think this might be better addressed in Stack Overflow. – Michael Stimson Jul 21 '14 at 22:48
  • 2
    It might be worth checking the process exitcode. If it's not 0 then the process has raised an error and hasn't successfully completed. – om_henners Jul 22 '14 at 0:29
  • @kflaw what is the complete output from the script, it should not just output "successful". And you don't seem to have changed srch_dir=r'C:\Temp\dgns' and gdb_dir=r'C:\Temp\gdbs' to your actual paths... – user2856 Jul 25 '14 at 0:57
  • @kflaw you have defined some variables outside the if __name__=='__main__': block. Don't do that. As I stated in my other answer the use of the if __name__=='__main__': syntax is required on Windows. – user2856 Jul 25 '14 at 5:33
  • I see, making sure the variables used were in the if name__=='__main': block did the trick. I need to better understand that. Thanks so much for all your help. – kflaw Jul 25 '14 at 15:00
5

You're probably getting some sort of exception being raised. Perhaps use a Queue to pass messages back to the parent process.

Tested working code:

import os, arcpy, arcgisscripting, time, sys
from multiprocessing import Process
from multiprocessing.queues import SimpleQueue

def ConvertCADtoGDB(msgs,in_dgn,out_gdb):
    try:
        gp = arcgisscripting.create()
        gp.ImportCAD_conversion(in_dgn,out_gdb,'','Explode_Complex')
        if not arcpy.Exists(out_gdb):raise RuntimeError('%s does not exist'%out_gdb)
        msgs.put(gp.GetMessages())
    except Exception as err:
        msgs.put(gp.GetMessages())
        msgs.put(err)

def main(srch_dir,gdb_dir,timeout):
    for dirpath, dirnames, files in os.walk(srch_dir):
        for f in files:
            f_name, f_ext = os.path.splitext(f)
            in_dgn = os.path.join(dirpath,f)
            out_gdb = os.path.join(gdb_dir,f_name+'.gdb')
            if f_ext == '.dgn':
                if not os.path.isdir(out_gdb):
                    print 'creating',out_gdb
                    #####################################################
                    # Create a separate process to run the tool in
                    # and a Queue to pass messages back
                    m = SimpleQueue()
                    p = Process(target=ConvertCADtoGDB,
                                       args=(m,in_dgn,out_gdb))
                    p.start()
                    p.join(timeout)   # Wait for process to complete
                    err = None
                    while not m.empty(): # Check if messages in queue
                        msg = m.get()
                        if isinstance(msg, Exception):err= msg
                        else: print msg
                    if p.is_alive():  # Terminate process if it is
                        p.terminate() # still running after the timeout
                        print('terminated')
                    elif err:
                        print('unsuccessful: %s'%err)
                    else:
                        print('successful')
                    #####################################################

if __name__ == '__main__':
    srch_dir=r'C:\Temp\dgns'
    gdb_dir=r'C:\Temp\gdbs'
    timeout=60 #Seconds
    main(srch_dir,gdb_dir,timeout)

The output is:

creating C:\Temp\gdbs\smalltest.gdb
Executing: ImportCAD C:\Temp\dgns\smalltest.dgn C:\Temp\gdbs\smalltest.gdb # Explode_Complex
Start Time: Thu Jul 24 09:37:42 2014
...Importing layers from C:\Temp\dgns\smalltest.dgn
...Importing entities from C:\Temp\dgns\smalltest.dgn
......4 entities imported from C:\Temp\dgns\smalltest.dgn
...Importing and consolidating extended data to separate table
Succeeded at Thu Jul 24 09:37:46 2014 (Elapsed Time: 4.00 seconds)
successful
  • Thanks for the answer. I tested your code and it printed 'successful', but no files have been written out to disk. – kflaw Jul 22 '14 at 14:42
  • @kflaw please edit your question to show the new code you ran – user2856 Jul 23 '14 at 1:35
  • i added the code but its just the same as your except i inserted my function - I don't know how useful that is. I am a bit beyond my limits with this – kflaw Jul 23 '14 at 16:22
  • i took the code away, it was redundant. As I mentioned I didn't change anything except inserting my own function – kflaw Jul 23 '14 at 16:37

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