JohnDye的最新贡献

根据RJ Sunderman的这篇文章，当你轮询ArcGIS服务器的特征并使用获取增量更新方法时，输入将维护内存中的缓存。有没有办法查询这个缓存来确定底层的增量是什么?在我的例子中，我想创建一个GeoEvent服务，它将每5分钟轮询一个Feature service进行更新。当它确定对服务进行了更新(添加了一个或多个特性，编辑了一个或多个特性，或两者的某种组合)时，我希望它实际地将返回的特性与内存中的缓存进行比较，并编译实际的更改，以便将它们作为新特性写入“Change-Log”特性服务。如果没有一种方法来查询内存中的缓存(这是我的期望)，是否有另一种方法来确定更改的性质?我们希望非常细粒度地跟踪对某些服务所做的每一个更改。我们尝试使用soi来实现这一点，并且在一定程度上取得了成功，但是缺少对托管服务的支持已经成为了一个障碍，因为我们正在非常努力地摆脱联邦服务。 ．.．查看更多

有人知道FieldInfo类中的addField方法是做什么的吗?关于它的文档并不是特别有用。我想知道这是否可能是一个非常有效的方法，将一个字段添加到一个特征层。 ．.．查看更多

今天我在组装一个工具箱工具时，遇到了一个有趣的问题。import arcpy class Toolbox (object): def __init__ (self): """定义工具箱(工具箱的名称是.pyt文件的名称)"自我。标签= "工具箱"自我。alias = "" #与工具箱self相关的工具类列表。工具(对象):def __init__ (self): """定义工具(工具名是类的名称)。"自我。label = "工具"自我。Description = "" self。canRunInBackground = False def MessageBox (self, Title, Message, ButtonStyle = 0, MessageboxType = "NOICON"): """用给定的标题和指定的ButtonStyle和MessageboxType引发一个系统模式的消息框。用于从在后台线程上操作的Python工具箱工具中引发消息框。input: Title (String)消息框的标题Message (String)消息框中显示的消息ButtonStyle (Integer)值:按钮显示:0 OK(默认)1 OK | Cancel 2 Abort | Retry | Ignore 3 Yes | No | Cancel 4 Yes | No 5 Retry | No 6 Cancel | Try Again | Continue MessageboxType (String)值:描述: NOICON No icon is displayed in the Messagebox INFO An Information Icon is displayed QUESTION A Question Mark Icon is displayed WARNING A Warning Icon is displayed ERROR An Error Icon is displayed OUTPUTS: Button Clicked (Integer) Value returned indicates the buttonpressed by the user Return Value Button Pressed 1 OK 2 Cancel 3 Abort 4 Retry 5 Ignore 6 Yes 7 No 10 Try Again 11 Continue """ if MessageboxType == "NOICON" : MB_STYLE = 0x00 elif MessageboxType == "INFO" : MB_STYLE = 0x40 elif MessageboxType == "QUESTION" : MB_STYLE = 0x20 elif MessageboxType == "WARNING" : MB_STYLE = 0x30 elif MessageboxType == "ERROR" : MB_STYLE = 0x10 else : raise Exception ( "Invalid 'MessageboxType' value" ) if ButtonStyle not in range ( 0 , 7 ) : raise Exception ( "Invalid 'ButtonStyle' value" ) import ctypes buttonPressed = ctypes . windll . user32 . MessageBoxA ( 0 , Message , Title , ButtonStyle | MB_STYLE | 0x40000 ) return buttonPressed def getParameterInfo ( self ) : """Define parameter definitions""" param0 = arcpy . Parameter ( displayName = "Input Features" , name = "in_features" , datatype = "GPString" , parameterType = "Required" , direction = "Input" ) param0 . filter . type = "ValueList" param0 . filter . list = [ "Butter" , "Milk" , "Bread" ] params = [ param0 ] return params def isLicensed ( self ) : """Set whether tool is licensed to execute.""" return True def updateParameters ( self , parameters ) : """Modify the values and properties of parameters before internal validation is performed. This method is called whenever a parameter has been changed.""" if parameters [ 0 ] . value : self . MessageBox ( "Selected Parameter" , parameters [ 0 ] . valueAsText ) return def updateMessages ( self , parameters ) : """Modify the messages created by internal validation for each tool parameter. This method is called after internal validation.""" return def execute ( self , parameters , messages ) : """The source code of the tool.""" arcpy . AddMessage ( "Parameter 0: " + parameters [ 0 ] . valueAsText ) return There's nothing crazy going on here. Only thing out of the ordinary is that MessageBox function. Here's the weird thing. My updateParameters function has some logic to raise a Messagebox that displays the value selected by the user in param0. Works fine except that for some reason, the value is being sliced - I'm only getting the first letter of the selected parameter. I also added an AddMessage function to the execute function to print the selected parameter to the Results Window. That actually gives me the full value, so perhaps it is my Messagebox function that is slicing it but I don't think so. Anyone have any insight? ．.．查看更多