ListLayers error

[PROBERT68]

I am having an syntax error from Pyscripter here and not sure why but I have a shapefile at the top of the TOC list which is the first and should be number zero  when writing a listlayers as a zero  but I still get the error .

The error is :

Traceback (most recent call last):

  File "C:\Student\python\GeoTIFF.py", line 16, in <module>

    gridlayer = arcpy.mapping.ListLayers(mxd,'JERGRIDINDEX', df,)[0]

IndexError: list index out of range

Take a look here the sytanx:: gridlayer = arcpy.mapping.ListLayers(mxd,'JERGRIDINDEX', df,)[0]

[JakeSkinner]

Hi Robert,

Would you be able to post all of your code?  This will help troubleshoot this faster.

[PROBERT68]

Here you go:

mport arcpy.mapping, os

mxd = arcpy.mapping.MapDocument (r"E:\workspace\Test.mxd")

arcpy.env.workspace = r"E:/workspace/images/"

df = arcpy.mapping.ListDataFrames(mxd)[0]

df.scale = 40000

gridlayer = arcpy.mapping.ListLayers(mxd,'JERGRIDINDEX', df,)[0]

arcpy.SelectLayerByAttribute_management(gridlayer, "NEW_SELECTION")

for row in arcpy.SearchCursor(gridlayer):

  df.panToExtent(row.shape.extent)

  arcpy.RefreshActiveView()

  filename = "E:/workspace/images/" + \

    str(row.getValue("PageNumber")).zfill(4) + ".tif"

  arcpy.mapping.ExportToTIFF(mxd, filename, df, df_export_width= 65000, df_export_height=30000,geoTIFF_tags=True)

##  arcpy.mapping.ExportToTIFF(mxd, filename, df, df_export_width= 1280, \

##    df_export_height=440, geoTIFF_tags=True)

print arcpy.GetMessages()

[JakeSkinner]

Everything looks correct, unless you are mis-spelling the layer name.  However, since you want the first layer, you will not have to specify a name.  Try the following:

gridlayer = arcpy.mapping.ListLayers(mxd,'', df,)[0]

One thing I did just notice is the arcpy.env.workspace.  Since you are specifying an 'r' before the path, you will want to change the forward slashes to backslashes.  Ex:

arcpy.env.workspace = r"E:\workspace\images"

[PROBERT68]

I did the same thing what you suggest. I can try and run it from Python window but Pyscripter should be able to recongize it.  Can I run this script from Pyscripter rather than in python window ?

[JakeSkinner]

Yes, you should be able to run this in Pyscripter.

[PROBERT68]

How can I sync this Pyscripter to Arcmap ?

[JakeSkinner]

I'm not quite sure what you mean.  When the code is executed in Pyscripter, you will not see the map's extent updated.  However, you should still have the TIFF file created.

[PROBERT68]

I am thinking maybe it is not working.How can Pyscripter communicate with ArcMap if I write these codes ?

[GusMartinka]

Check out the Execute and debug your tool section for help attaching pyscripter to ArcMap for debugging.