I have an mxd file that I've loaded into ArcMap. When finished loading, there are several layers; some of which that have multiple feature classes. The end result is listing all the filepaths/locations/source of each feature class, but for now, I just need to know how to list all the feature classes that are loaded. And when I say list, they can really just be output to the screen via message boxes. I know I'll need to loop through each layer, but utilizing the right interface and accessing ArcMaps properties is where I get lost.
Any help on this would be greatly appreciated. I'm still learning ArcObjects and how it all works and in desperate need of help. Thanks in advance.
This would be an example in C# to loop through all layers and if it's a feature layer, get until the workspace to get the path or whatever from it:
/* Make a list of all feature classes. */
List<ILayer> layers_list = new List<ILayer>();
IMap map = get_map();
IEnumLayer enumLayer = map.get_Layers(null, true);
ILayer layer = null;
while (layer = enumLayer.Next() != null) {
// we're looking for a feature class only
if (layer is IFeatureLayer) {
try {
IFeatureClass fclass = ((IFeatureLayer)layer).FeatureClass;
IFeatureLayer featureLayer = (IFeatureLayer)layer;
// Get the dataset and workspace of the feature class
IDataset ds = (IDataset)fclass;
IWorkspace ws = (IWorkspace)ds.Workspace;
// Do something with the workspace, like getting the path or
// whatever...
} catch (Exception e) {
MessageBox.Show("Layer ' " + layer.Name + "': \n\n" + e.Message);
}
}
}
Related
I am trying to automate and create a Canoe simulation.
My usecase :
I have a configuration (LibraryTest.cfg) with a CAN Network and a node ACAN in the network. I want to create another node BCAN automatically into the existing configuration along with ACAN. I am trying this using C# .NET Canoe Library for this.
CANoe.Application mApp;
CANoe.Measurement mMsr;
CANoe.Networks mNet;
mApp = new CANoe.Application();
string ConfigFile=
"C:\\Users\\deepasreeraj\\Desktop\\GAC\\TestUnit1\\LibraryTest.cfg";
try
{
mApp.Open(ConfigFile, true, true);
mMsr = (CANoe.Measurement)mApp.Measurement;
mNet = mApp.Networks;
CANoe.Simulation mSim = mApp.Simulation;
if (mNet != null)
{
if(mNet != null)
{
int count = mNet.Count;
for (int i = 0; i < count; i++)
{
mNet.Add("BCAN");
string Nodename = mNet[i].NetworkInterfaces;
}
}
}
}
catch (System.Exception ex)
{
System.Console.WriteLine(ex.Message);
}
}
In this, while the code reaches mNet.Add("BCAN"); it gives an exception "The method or operation is not implemented." Can someone please help me with this?
If you want to add a node, the Networks property is wrong.
You have to use mApp.Configuration.SimulationSetup.Buses.Nodes. There you can call Add to add a new node.
Just check the page Technical References -> COM Interface -> Object Hierarchy in the CANoe help for the complete API Reference.
I am trying to make shapefiles with point geometries using GDAL. I am following the example given here. I am using Microsoft Visual Studio and the programming language is C#. For now, I am just making one point at the origin and I'm viewing the resulting shapefiles in QGIS. For some reason, I am not being able to view the point which I make. I have tried making a polygon too but I am facing the same problem. Below is the code I have written:
public void testSF(Dataset ds)
{
Console.WriteLine("Writing ERSI shapefile");
// Registering drivers
OSGeo.OGR.Ogr.RegisterAll();
OSGeo.OGR.Driver driverSH = OSGeo.OGR.Ogr.GetDriverByName("ESRI Shapefile");
if (driverSH == null)
{
Console.WriteLine("Cannot get drivers. Exiting");
System.Environment.Exit(-1);
}
Console.WriteLine("Drivers fetched");
// Creating a shapefile
OSGeo.OGR.DataSource dataSourceSH = driverSH.CreateDataSource("ERSI_TEST_ShapeFile.shp", new string[] { });
if (dataSourceSH == null)
{
Console.WriteLine("Cannot create datasource");
System.Environment.Exit(-1);
}
Console.WriteLine("Shapefile created");
// Creating a point layer
OSGeo.OGR.Layer layerSH;
layerSH = dataSourceSH.CreateLayer("PolygonLayer", null, OSGeo.OGR.wkbGeometryType.wkbPoint, new string[] { });
if (layerSH == null)
{
Console.WriteLine("Layer creation failed, exiting...");
System.Environment.Exit(-1);
}
Console.WriteLine("Polygon Layer created");
// Creating and adding attribute fields to layer
OSGeo.OGR.FieldDefn fdefnName = new OSGeo.OGR.FieldDefn("Name", OSGeo.OGR.FieldType.OFTString);
fdefnName.SetWidth(32);
OSGeo.OGR.FieldDefn fdefnGPS = new OSGeo.OGR.FieldDefn("GPS", OSGeo.OGR.FieldType.OFTString);
fdefnGPS.SetWidth(32);
if (layerSH.CreateField(fdefnName, 1) != 0)
{
Console.WriteLine("Creating Name field failed");
System.Environment.Exit(-1);
}
if (layerSH.CreateField(fdefnGPS, 1) != 0)
{
Console.WriteLine("Creating GPS field failed");
System.Environment.Exit(-1);
}
Console.WriteLine("Fields created and added to layer");
OSGeo.OGR.Feature featureSH = new OSGeo.OGR.Feature(layerSH.GetLayerDefn());
featureSH.SetField("Name", "This is a NAME");
featureSH.SetField("GPS", "Test GPS point");
// Outer Ring
// Methodology: Create a linear ring geometry, add it to a polygon geometry. Add polygon geometry to feature. Add feature to layer
OSGeo.OGR.Feature feature = new OSGeo.OGR.Feature( layerSH.GetLayerDefn() );
OSGeo.OGR.Geometry geom = OSGeo.OGR.Geometry.CreateFromWkt("POINT(0.0 0.0)");
feature.SetGeometry(geom);
layerSH.CreateFeature(feature);
}
This code adds a point to the polygon layer at 0.0 and 0.0. However, when I open the resulting layer in QGIS, I can not see/locate the point. Any help would be appreciated.
I have tested your code with last GDAL release and it works.
You have to close the datasource (call Dispose method) to update the file with the created geometry otherwise you will just view an empty file.
I think You are missing to define the spatial reference
Hi I have a Outlook com addin that is doing some simple searching tricks for me. I am part way through putting it together but I am having issues with it running out of memory. The process is very simple and basically loops through an outlook folder checking each mailItem for a match. given the loop reinitialize the variables each time I would have expected the garbage collector to keep up but when I watch the memory it loses ~10m/sec until the system is out of memory and I get unhandled exceptions.
This is part of the code
private void FindInFolder(Outlook.MAPIFolder FolderToSearch)
{
Outlook.MailItem mailItem;
Outlook.MAPIFolder ParentFolder;
int counter = 0;
StatusBar.Text = "Searching in Folder " + FolderToSearch.FolderPath + "/" + FolderToSearch.Name;
StatusBar.Update();
this.Update();
foreach (COMObject item in FolderToSearch.Items)
{
counter++;
if (counter % 100 == 0)
{
StatusBar.Text = FolderToSearch.FolderPath + "/" + FolderToSearch.Name + " item " + counter + " of " + FolderToSearch.Items.Count;
StatusBar.Update();
if (counter % 1000 == 0)
{
GC.Collect();
}
}
if (item is Outlook.MailItem)
{
mailItem = item as Outlook.MailItem;
if (IsMatch(mailItem))
{
if (mailItem.Parent is Outlook.MAPIFolder)
{
ParentFolder = mailItem.Parent as Outlook.MAPIFolder;
ResultGrd.Rows.Add(mailItem.EntryID, ParentFolder.FolderPath, mailItem.SenderName, mailItem.Subject, mailItem.SentOn);
}
}
}
mailItem = null;
}
}
Which calls
private Boolean IsMatch(Outlook.MailItem inItem)
{
Boolean subBool = false;
Boolean NameBool = false;
try
{
if (null != inItem)
{
if (SubjectTxt.Text != "")
{
if (inItem.Subject.Contains(SubjectTxt.Text))
{
subBool = true;
}
}
else
{
subBool = true;
}
if (NameTxt.Text != "")
{
if (inItem.Sender != null)
{
if (inItem.Sender.Name.Contains(NameTxt.Text))
{
NameBool = true;
}
}
}
else
{
NameBool = true;
}
return subBool && NameBool;
}
}
catch (System.Runtime.InteropServices.COMException ce)
{
if (ce.ErrorCode == -2147467259)
{
//DO nothing just move to the next one
}
else
{
MessageBox.Show("Crash in IsMatch error code = " + ce.ErrorCode + " " + ce.InnerException);
}
}
return false;
}
Please excuse all the error catching part at the bottom and the GC.collect they are some of my attempts to work out what is wrong and free up memory.
Note also FindInFolder is called by a new thread so I can interact with results while it continues to search.
What I have tried so far:
Making variables local to function not class so the are retrievable by G, however the most used variable in 'item' as it is part of foreach it must be declared that way.
every 1000 mailItems do a manual GC, this made no difference at all.
For some reason it needs alot of memory just looping through the items and GC never frees them up.
Please also note I am using netoffice not VSTO for Com addin.
First of it all: This is NetOffice code and you dont need Marshal.ReleaseComObject in NetOffice. (Moreover, its useless to call ReleaseComObject here) Use Dispose() for the instance instead.
Keep in your mind: NetOffice handle COM proxies for you (Thats why its allowed to use two 2 dots in NetOffice).
In your case its internaly stored as:
// FolderToSearch
-- Items
--Enumerator
-- Item
-- Item
-- ....
Use item.Dispose() at the end of each loop to remove/free the item instance or use the following after foreach
FolderToSearch.Dipose()
// dispose folder instance and all proxies there comes from
FolderToSearch.DisposeChildInstances()
// dispose all proxies there comes from but keep the folder instance alive
Next:
The Items enumerator here is a custom enumerator(given by NetOffice)
However it works fine with small amount of items but dont do this in a more
heavier scenario(may exchange server and thousands of items). The local workstation/program can't handle this in memory. For this reason Microsoft provides only the well kown GetFirst/GetNext pattern. In NetOffice it looks like:
Outlook._Items items = FolderToSearch.Items;
COMObject item = null;
do
{
if (null == item)
item = items.GetFirst() as COMObject;
if (null == item)
break;
// do what you want here
item.Dispose();
item = items.GetNext() as COMObject;
} while (null != item);
This should works as well.
When working with COM objects from C#, there were 2 tricks that I used to prevent memory and COM object reference counts from building:
Use System.Runtime.InteropServices.Marshal.ReleaseComObject() to release COM objects as you are done with them. This forces a COM "release" on the object.
Do not foreach to iterate through a COM collection. foreach holds on to an enumerator object, which prevents other objects from being released.
So, instead of this:
foreach (COMObject item in FolderToSearch.Items)
{
// ....
}
do this:
Items items = FolderToSearch.Items;
try
{
for (int i = 0; i < items.Count; ++i)
{
COMObject item = items[i];
try
{
// work
}
finally
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(item);
}
}
}
finally
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(items);
}
These tips helped me reduce memory and object consumption.
Disclaimer: I cannot attest to whether this is good practice or not though.
First, I'd recommend using the Find/FindNext or Restrict methods of the Items class instead of iterating through all items in the folder. For example:
Sub DemoFindNext()
Dim myNameSpace As Outlook.NameSpace
Dim tdystart As Date
Dim tdyend As Date
Dim myAppointments As Outlook.Items
Dim currentAppointment As Outlook.AppointmentItem
Set myNameSpace = Application.GetNamespace("MAPI")
tdystart = VBA.Format(Now, "Short Date")
tdyend = VBA.Format(Now + 1, "Short Date")
Set myAppointments = myNameSpace.GetDefaultFolder(olFolderCalendar).Items
Set currentAppointment = myAppointments.Find("[Start] >= """ & tdystart & """ and [Start] <= """ & tdyend & """")
While TypeName(currentAppointment) <> "Nothing"
MsgBox currentAppointment.Subject
Set currentAppointment = myAppointments.FindNext
Wend
End Sub
See the following articles for more information and sample code:
How To: Use Find and FindNext methods to retrieve Outlook mail items from a folder (C#, VB.NET)
How To: Use Restrict method to retrieve Outlook mail items from a folder
Also you may find the AdvancedSearch method of the Application class helpful. The key benefits of using the AdvancedSearch method are listed below:
The search is performed in another thread. You don’t need to run another thread manually since the AdvancedSearch method runs it automatically in the background.
Possibility to search for any item types: mail, appointment, calendar, notes etc. in any location, i.e. beyond the scope of a certain folder. The Restrict and Find/FindNext methods can be applied to a particular Items collection (see the Items property of the Folder class in Outlook).
Full support for DASL queries (custom properties can be used for searching too). You can read more about this in the Filtering article in MSDN. To improve the search performance, Instant Search keywords can be used if Instant Search is enabled for the store (see the IsInstantSearchEnabled property of the Store class).
You can stop the search process at any moment using the Stop method of the Search class.
Second, I always suggest releasing underlying COM objects instantly. Use System.Runtime.InteropServices.Marshal.ReleaseComObject to release an Outlook object when you have finished using it. Then set a variable to Nothing in Visual Basic (null in C#) to release the reference to the object. You can read more about that in the Systematically Releasing Objects article.
If you want to use GC, you need to call the Collect and WaitForPendingFinalizers methods twice.
Matt, you still don't release all objects in the code. For example:
for (int i = 0; i < FolderToSearch.Items.Count; ++i)
{
COMObject item = FolderToSearch.Items[i];
The Items property of the Folder class returns an instance of the corresponding class which should be released after. I see at lease two lines of code where the reference counter is increased.
We're creating a WPF app in which we execute python scripts from different Test Stations and show the output in its corresponding output panel, To run the scripts in parallel we are using Task but when we run the scripts in parallel from the stations, We are getting the output of other stations also into the station that is started first, we're using the following code,
private void ZmqStatusListener(string endPoint)
{
using (Context context = new Context())
{
StatusPort = string.Empty;
TestResultPort = string.Empty;
using (Socket server = context.Socket(SocketType.REP))
{
try
{
if (isStatusContextActive == false || isPortChanged == true)
{
server.Bind(endPoint);
isStatusContextActive = true;
}
}
catch (ZMQ.Exception ex)
{
if (ex.Errno != 100)
{
string IPCPort = _globalParameters.GlbParam.GlbParamIpcStartPort;
if (IPCPort == string.Empty)
{
IPCPort = "0";
}
if (endPoint == EditorConstants.PortAddress.PortPrefix + IPCPort)
{
StatusPort = endPoint;
TestReultError = EditorConstants.CommonMessageTypes.TestReultError + ex.Message + EditorConstants.CommonMessageTypes.StackTraceMessage + ex.StackTrace;
}
StopExecOfScript(default(object));
isCancelledtask = true;
ScriptStatusDesc = new ScriptStatusDesc()
{
Status = "Failed",
statusDescription = "Failed"
};
}
}
while (true)
{
string message = server.Recv(Encoding.UTF8);
UpdateTestResults(message);
server.Send(" ACK", Encoding.UTF8);
// if (message == "Test Passed")
//break;
}
}
}
}
and for testing purpose we're breaking the while loop in this code based on a test message we kept in the python script, then we are able to get the output in the respective station correctly but this way we can only run in a synchronous fashion which we don't want as we require to run the test stations in parallel and the while loop should not break as it should be listening for the response.
We were able to solve the issue by getting clues doing a sample app to reproduce the issue and to first know whether our ClrZmq pattern was correct for us or not and it is correct. The resolution we followed is that when we needed to bind that data to its corresponding View's Model object in its ViewModel so had to retrieve View's DataContext which is of Type ISomeXViewModel for the particular TestStation using an Id of that TestStation we did this cos all of our TestStations are dynamically added and we even store it to be accessed wherever necessary. This issue was caused to due multiple instances of UserControls so we explicitly needed to update the TestStation manually with a little more effort.
Sample Code Snippet
private void BindTestResult(string xmlPayLoad)
{
// converting xmlPalLoad to a class/model object
ITestStationViewModel viewModel = (ITestStationViewModel)((IView)DynamicTestStationsGrid.Children[StationNumber].Content).DataContext;
// IView class has DataContext property so I am type casting the Content which is ContentControl to IView type first and later to ITestStationViewModel
viewModel.TestStationModel = xmlPayLoadModel;
}
Thanks.
I can't sort this weird issue out and I have tried anything and everything I can think of.
I got 5 pages, everyone of them passing variables with navigation this way:
Pass:
NavigationSerice.Navigate(new Uri("/myPage.xaml?key=" + myVariable, UriKind.Relative));
Retrieve:
If (NavigationContext.QueryString.ContainsKey(myKey))
{
String retrievedVariable = NavigationContext.QueryString["myKey"].toString();
}
I open a list on many pages and one of the pages automatically deletes an item from the list actualProject (actualProject is a variable for a string list). Then, when I go so far back that I reach a specific page - the app throws an exception. Why? I have no idea.
The code that deletes the item:
// Remove the active subject from the availible subjects
unlinkedSubjects.Remove(actualSubject);
unlinkedsubjectsListBox.ItemsSource = null;
unlinkedsubjectsListBox.ItemsSource = unlinkedSubjects;
Then the page that throws the exception's OnNavigatedTo event:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if (NavigationContext.QueryString.ContainsKey("key"))
{
actualProject = NavigationContext.QueryString["key"];
try
{
//Read subjectList from IsolatedStorage
subjectList = readSetting(actualProject) != null ? (List<String>)readSetting(actualProject) : new List<String>();
//Put the subjectList into the subjectListBox
subjectListBox.ItemsSource = subjectList;
//Set the subjectsPageTitle to the "actualProject" value, to display the name of the current open project at the top of the screen
subjectsPageTitle.Text = actualProject;
}
catch (Exception)
{
if (language.Equals("en."))
{
// Language is set to english
MessageBox.Show("Couldn't open the project, please try again or please report the error to Accelerated Code - details on the about page");
}
else if (language.Equals("no."))
{
// Language is set to norwegian
MessageBox.Show("Kunne ikke åpne prosjektet, vennligst prøv igjen eller rapporter problemet til Accelerated Code - du finner detaljer på om-siden");
}
}
}
}
Exception:
_exception {System.ArgumentException: Value does not fall within the expected range.} System.Exception {System.ArgumentException}
My theory:
The app kind of loads the currently opened and modified List. Is that possible? No idea.
So there are a number of ways to pass data between pages.
The way you have chosen is the least suggested.
You can use the PhoneApplicationService.Current dictionary but this is messy also if you have a ton of variables, doesn't persist after app shut down and could be simplified.
I wrote a free DLL that kept this exact scenario in mind called EZ_iso.
You can find it here
Basically what you would do to use it is this.
[DataContractAttribute]
public class YourPageVars{
[DataMember]
public Boolean Value1 = false;
[DataMember]
public String Value2 = "And so on";
[DataMember]
public List<String> MultipleValues;
}
Once you have your class setup you can pass it easily between pages
YourPageVars vars = new YourPageVars { /*Set all your values*/ };
//Now we save it
EZ_iso.IsolatedStorageAccess.SaveFile("PageVars",vars);
That's it! Now you can navigate and retrieve the file.
YourPageVars vars = (YourPageVars)EZ_iso.IsolatedStorageAccess.GetFile("PageVars",typeof(YorPageVars));
This is nice because you can use it for more than navigation. You can use it for anything that would require Isolated storage. This data is serialized to the device now so even if the app shuts down it will remain. You can of course always delete the file if you choose as well.
Please make sure to refer to the documentation for any exceptions you have. If you still need help feel free to hit me up on twitter #Anth0nyRussell or amr#AnthonyRussell.info