GPXPY Library – Can It Write GPX File? Detailed Explanation

gpxpython

I want to build a .gpx file and was hoping to use gpxpy. I can see how to build such a file in memory, but I can't see how to write it out to disk.

Is it possible for gpxpy to write files?

Best Answer

With gpxpy no, but with simple Python yes

Using the example of the PyPi page

....
print('Created GPX:', gpx.to_xml())
with open("output.gpx", "w") as f:
    f.write( gpx.to_xml())

(gpxpy uses lxml or elementtree to parse .gpx files (in parser.py file))

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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

Best Answer

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