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How To Fix Error Handling Python Arcgis
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Symptoms & Summary
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File Size 746 KB
Compatible Windows XP, Vista, 7 (32/64 bit), 8 (32/64 bit), 8.1 (32/64 bit) Windows 10 (32/64 bit)
lots of Python script tools. Since other people were going to use these tools, I wanted my error handling to be robust and informative. This post python programming arcgis is about some tips and tricks I discovered during this project. Error
handling basics The basics of handling Python errors are covered in the 9.3 help topic Error handling with Python. python arcgis field calculator The Python.org document Errors and Exceptions has more detailed information. Tip #1 - Use the arcgisscripting.ExecuteError exception In version 9.2, we introduced the arcgisscripting object along with a new exception class,
arcgisscripting.ExecuteError. (This arcgisscripting.ExecuteError exception class wasn't documented in version 9.2, so few people knew about it.) The arcgisscripting.ExecuteError exception is thrown whenever a geoprocessing tool or geoprocessing function encounters an error. What this means is that you can divide errors into two groups, geoprocessing errors (those that throw the arcgisscripting.ExecuteError exception) and everything else. You can then handle the errors differently, as python arcgis scripts demonstrated in the code below: import arcgisscripting gp = arcgisscripting.create(9.3) try: result = gp.getcount("C:/blah.shp") # x = y # Return GEOPROCESSING specific errors # except arcgisscripting.ExecuteError: gp.AddError(gp.GetMessages(2)) # Return any PYTHON or system specific errors # except: gp.AddError("Python or system error occurred") The code above is used as the source for a script tool. To keep things simple, the script tool has no parameters. When the script tool is executed, the call to getcount produces an error because the dataset "C:/blah.shp" doesn't exist. As a result, the progress dialog looks as follows: To prove how geoprocessing errors and Python errors are handled differently, change the two lines of code as follows: # result = gp.getcount("C:/blah.shp") x = y Now when the script is executed, an error will occur because the variable ‘y' is undefined, and the progress dialog will display as follows: Tip #2 - Beware of getting error messages from a result object Before moving on, a quick word about the result object, shown below: result = gp.getcount("C:/blah.shp") If the call to getcount above raises an exception, the result object is null. T
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ads with us Geographic Information Systems Questions Tags Users Badges Unanswered Ask Question _ Geographic Information Systems Stack Exchange is a question python arcgis book and answer site for cartographers, geographers and GIS professionals. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted https://blogs.esri.com/esri/arcgis/2008/12/01/tips-and-tricks-error-handling-in-python-script-tools/ up and rise to the top Displaying raised error messages to user in ArcGIS Geoprocessing Results window? up vote 13 down vote favorite 1 Can print statements raised from a custom exception be displayed in the Geoprocessing Results window? I modified a script that I found that takes two inputs from a user, finds the associated feature, then zooms to the feature. The tool works fine. I am trying to make http://gis.stackexchange.com/questions/4918/displaying-raised-error-messages-to-user-in-arcgis-geoprocessing-results-window it more user-friendly by automatically formatting the inputs to have the correct amount of characters. I added a messagebox that tells the user if they have too many characters in the input box, but I used easygui to create that (a Python library for GUIs). Instead, I would like to use the gp results window to display the message. I thought that I formatted the raise and except statements correctly but the tool runs and I get a completed result and not my error message. I tried the arcpy help from esri and did not get the results I was looking for. class BadInputError(Exception): pass # Import arcpy module import arcpy, sys, string from arcpy import env try: def checkInput(inp): mNCount = len(inp) trigger = 0 while trigger == 0: if mNCount == 4: trigger = 1 elif mNCount > 4: inp = '' trigger = -1 raise BadInputError elif mNCount == 3: inp = '0' + inp trigger = 1 elif mNCount == 2: inp = '00' + inp trigger = 1 elif mNCount == 1: inp = '000' + inp trigger = 1 return inp # Script arguments MapNumber = arcpy.GetParameterAsText(0) MapNumber = checkInput(MapNumber) ParcelNumber = arcpy.GetParameterAsText(1) ParcelNumber = checkInput(ParcelNumber) Expression = (""" "MAP" = '%s' AND "PARCEL" = '%
Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business http://gis.stackexchange.com/questions/135920/arcpy-logging-error-messages Learn more about hiring developers or posting ads with us Geographic Information Systems Questions Tags Users Badges Unanswered Ask Question _ Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Join http://gis.humboldt.edu/OLM/GSP_318/05_2_CallingArcGIS_FromPython.html them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Arcpy logging error messages up vote 2 down python arcgis vote favorite I am trying to write any error messages that arise in my script and record it in a text file. When I check my errorLog, the error messages are not recorded. Below is my code: Note the parameter 'filePath' is the file path to the file that produced the error. except: addError = arcpy.GetMessages(2) with open(errorLog, 'a') as errorMsg: errorMsg.write('%s, %s\n' % (filePath,addError)) If someone could assist with some insight, it would greatly be appreciated. arcpy error python arcgis tutorial log share|improve this question asked Feb 19 '15 at 0:38 TsvGis 1,491627 so errorLog is a file path to the log file and filePath is a string that contains some useful information... seems right to me, the using statement ensures the file is open and closed so you shouldn't need a flush()... the only thing I can think of is perhaps there's an override for open that is unintentional (like GDAL.open or os.open), what imports do you have? Could the file be locked? –Michael Miles-Stimson Feb 19 '15 at 0:55 Hi, the imports are arcpy, os, time and datetime. mmm now that you have mentioned imports I think I am missing one - poss. tracebak. –TsvGis Feb 19 '15 at 2:20 add a comment| 3 Answers 3 active oldest votes up vote 6 down vote I've written a python log handler that I'm more than happy to share. The idea being that you can use the standard Python logging framework and also have the messages reflected back to ArcGIS through the arcpy messages. import logging import logging.handlers import arcpy class ArcPyLogHandler(logging.handlers.RotatingFileHandler): """ Custom logging class that bounces messages to the arcpy tool window as well as reflecting back to the file. """ def emit(self, record): """ Write the log message """ try: msg = record.msg.format(record.args) except: msg = record.msg if record.levelno >= logging.ERROR: arcpy.AddError(msg) elif record.levelno >= logging.WARNING: arcpy.AddWarning(m
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A Windows error is an error that happens when an unexpected condition occurs or when a desired operation has failed. When you have an error in Windows, it may be critical and cause your programs to freeze and crash or it may be seemingly harmless yet annoying.
A stop error screen or bug check screen, commonly called a blue screen of death (also known as a BSoD, bluescreen), is caused by a fatal system error and is the error screen displayed by the Microsoft Windows family of operating systems upon encountering a critical error, of a non-recoverable nature, that causes the system to "crash".
One of the biggest causes of DLL's becoming corrupt/damaged is the practice of constantly installing and uninstalling programs. This often means that DLL's will get overwritten by newer versions when a new program is installed, for example. This causes problems for those applications and programs that still need the old version to operate. Thus, the program begins to malfunction and crash.
Computer hanging or freezing occurs when either a program or the whole system ceases to respond to inputs. In the most commonly encountered scenario, a program freezes and all windows belonging to the frozen program become static. Almost always, the only way to recover from a system freeze is to reboot the machine, usually by power cycling with an on/off or reset button.
Once your computer has been infected with a virus, it's no longer the same. After removing it with your anti-virus software, you're often left with lingering side-effects. Technically, your computer might no longer be infected, but that doesn't mean it's error-free. Even simply removing a virus can actually harm your system.
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Windows Operating Systems:
Compatible with Windows XP, Vista, Windows 7 (32 and 64 bit), Windows 8 & 8.1 (32 and 64 bit), Windows 10 (32/64 bit).