Latest Contributions by MarkCederholm

How do you set an output parameter (e.g. a feature set) in the execute method of a tool in a Python toolbox?  I've tried setting parameters = output and arcpy.SetParameter(n, output) and neither work.  For example, the following script works fine in a regular toolbox: import arcpy try:     arcpy.env.workspace = "in_memory"     # Get parameters     Input_Features = arcpy.GetParameterAsText(0)     Buffers = arcpy.CreateUniqueName("Buffer")     # Perform buffer     arcpy.Buffer_analysis(Input_Features, Buffers,         "100 Feet", "FULL", "ROUND", "NONE", "")     OutFeatureSet = arcpy.FeatureSet()     OutFeatureSet.load(Buffers)     arcpy.SetParameter(1, OutFeatureSet) except Exception, ErrorDesc:     sErr = "ERROR:\n" + str(ErrorDesc)     arcpy.AddError(sErr) But I can't get the output to work in a Python toolbox: import arcpy import os class Toolbox(object):     def __init__(self):         self.label = "Runtime Tools"         self.alias = ""         # List of tool classes associated with this toolbox         self.tools = [BufferTest] class BufferTest(object):     def __init__(self):         self.label = "Buffer Test"         self.description = "Create buffers"         self.canRunInBackground = False     def getParameterInfo(self):         params = []         param0 = arcpy.Parameter(             displayName = "Input Features",             name = "inputFeatures",             datatype = "Feature Set",             parameterType = "Required",             direction = "Input")         param0.value = os.path.join(os.path.dirname(__file__),             "FC_Templates.gdb\PointTemplate")         params.append(param0)         param1 = arcpy.Parameter(             displayName = "Buffers",             name = "buffers",             datatype = "Feature Set",             parameterType = "Derived",             direction = "Output")         params.append(param1)         return params     def execute(self, parameters, messages):         try:             arcpy.env.workspace = "in_memory"             # Get parameters             Input_Features = parameters[0].valueAsText             Buffers = arcpy.CreateUniqueName("Buffer")             # Perform buffer             arcpy.Buffer_analysis(Input_Features, Buffers,                 "100 Feet", "FULL", "ROUND", "NONE", "")             OutFeatureSet = arcpy.FeatureSet()             OutFeatureSet.load(Buffers)             # parameters[1] = OutFeatureSet             arcpy.SetParameter(1, OutFeatureSet)         except Exception, ErrorDesc:             sErr = "ERROR:\n" + str(ErrorDesc)             messages.addErrorMessage(sErr)         return What am I doing wrong?  Thanks! ... View more

I've noticed that row objects tend not to like to travel outside the scope of a search loop, even if the unique option is set.  For example, this code works OK:    foreach (Row r in tab.Search("*", "", RowInstance.Unique))    {     this.Manipulate(r);     tab.Update(r);     break;    } Whereas this can crash with a protected memory violation:    Row row = null;    foreach (Row r in tab.Search("*", "", RowInstance.Unique))    {     row = r;     break;    }    if (row != null)    {     this.Manipulate(row);     tab.Update(row);    } This seems to go against common programming sense, but obviously code design can accommodate this. ... View more

I have an empty point feature class and I add a feature using the following code:    tab = gdb.OpenTable("\\" + sClassName);    row = tab.CreateRowObject();    row.SetString("TITLE", "Hwy 69/access road");    row.SetString("DETAIL", "there is no valve here");    pt = new Point(1239977, 12558523);    pb = new PointShapeBuffer();    pb.Setup(ShapeType.Point);    pb.point = pt;    row.SetGeometry(pb);    tab.Insert(row);    tab.Close(); I can read the feature just fine using the following code:    tab = gdb.OpenTable("\\" + sClassName);    foreach (Row r in tab.Search("*", "1 = 1", RowInstance.Recycle))    {     pb = r.GetGeometry();     pt = pb.point;     Console.WriteLine("x=" + pt.x.ToString() + ",y=" + pt.y.ToString());     string s = r.GetString("TITLE");     Console.WriteLine("TITLE=" + s);     s = r.GetString("DETAIL");     Console.WriteLine("DETAIL=" + s);    }    tab.Close(); But when I try to preview the feature class in ArcCatalog or open it in ArcMap (10.0SP4), I get "Error opening feature class, General function failure".  Any idea what I might be doing wrong? (I'm using API 1.2) ... View more

Is there a way to change the maximum map scale so that you can zoom in closer? ... View more

I'd like to see da support spatial queries (i.e. using a geometry class, since not all geodatabases support spatial SQL). ... View more