I want to extract text from a specified pdf area with itextsharp. I know there is an example http://sourceforge.net/p/itextsharp/code/HEAD/tree/book/iTextExamplesWeb/iTextExamplesWeb/iTextInAction2Ed/Chapter15/ExtractPageContentArea.cs#l35. The core code is like this:
RenderFilter[] filter = {new RegionTextRenderFilter(rect)};
ITextExtractionStrategy strategy = new FilteredRenderListener(new LocationTextExtractionStrategy(), filter);
string text = PdfTextExtractor.GetTextFromPage(reader, i, strategy);
However, vs2012 shows me that "cannot convert implicitly from FilteredRenderListener to ITextExtractionStrategy ". I tried to do explicit conversion. But failed. Could anyone help me? Do I use a wrong itextsharp version? Thanks so much!
Your line looks like this:
ITextExtractionStrategy strategy = new FilteredRenderListener(new LocationTextExtractionStrategy(), filter);
but the corresponding lines from the sample you reference look like this:
ITextExtractionStrategy strategy;
...
strategy = new FilteredTextRenderListener(
new LocationTextExtractionStrategy(), filter
);
I.e. the sample uses a FilteredTextRenderListener while you only use a FilteredRenderListener. The former actually extends the latter to also implement ITextExtractionStrategy.
Thus, simply use FilteredTextRenderListener instead of FilteredRenderListener.
Related
With the nDepend API, would something like the following be possible?
I want to keep a watch out for instances where our object factory has been bypassed and a concrete class is being instantiated directly.
Obviously I'd need to be able to filter out things like:
StringBuilder stringBuilder = new StringBuilder();
perhaps by adding to the Where clause type names to exclude, or namespaces in which to check, but I want to make sure we see:
IMyCustomType item = ObjectFactory.Get<IMyCustomType>();
and not this:
MyCustomType item = new MyCustomType();
Thanks.
Maybe such code rule below could help you, hopefully it is understandable enough to not have to comment it:
warnif count > 0
let ctors = Application.Namespaces.WithNameLike("Namespaces1*").ChildMethods().Where(m => m.IsConstructor)
let codeThatMustNotCallCtors = Application.Namespaces.WithNameLike("Namespaces2*").ChildMethods()
from m in codeThatMustNotCallCtors.UsingAny(ctors)
select new { m, ctorsCalled = m.MethodsCalled.Intersect(ctors ) }
I am new to JSON and using the JSONObject.cs from the Unity Assets Store to decode the JSON file. I put the JSONObject.cs in the Standard Assets folder, the example.js is in Scripts folder. When I tested the example (in javascripts) in Unity:
var encodedString: String = "{\"field1\": 0.5,\"field2\": \"sampletext\",\"field3\": [1,2,3]}";
var j: JSONObject = new JSONObject(encodedString);
it has a compiler error, which is said:
BCE0024: The type 'JSONObject' does not have a visible constructor that matches the argument list '(String)'.
Do I need to declare the JSONObject class in example file again? Any thoughts would be very much appreciated!
After working 2 hours into this ... I have found the problem.
So, the C# class of JSONObject has a constructor (which you and me were using) with optional arguments. So as I understand from my tries calling it from Javascript won't work unless you send the optionals.
I have made it work by suppling the defaults on the call from JS.
This is the Contructor:
public JSONObject(string str, int maxDepth = -2, bool storeExcessLevels = false, bool strict = false) {
Parse(str, maxDepth, storeExcessLevels, strict);
}
Instead of calling from JS like this:
var obj: JSONObject = new JSONObject("{json here}");
Call it sending the same defaults that constructor have:
var obj: JSONObject = new JSONObject("{json here}", -2, false, false);
In that way you won't be using the defaults and it works (I know is agly, but I don't have time to do more work arounds... so here is the solution if some one got the same issue)
Can you provide more info?
The error you have says that you can't just add the string as a parameter to the constructor. Maybe you can just construct the JSonObject and then find a relevant method for decoding the Json string?
I'm trying to convert an entire column values into a arrayList using ormlite on android, is this possible, with direct api?
Using raw results i get close, but not quite:
GenericRawResults<String[]> rawResults =
getHelper().getMyProcessDao().queryRaw(
queryBuild.selectColumns("nid").prepareStatementString());
List<String[]> result = rawResults.getResults();
Hrm. I'm not sure this is what you want. However, one way to accomplish what you ask for specifically is through by using the RawRowMapper which can be passed to ORMLite's DAO method: dao.queryRaw(String, Rowmapper, String...).
Something like the following should work:
RawRowMapper<Integer> mapper = new RawRowMapper<Integer>() {
public Integer mapRow(String[] columnNames, String[] resultColumns) {
// maybe you should verify that there _is_ only 1 column here
// maybe you should handle the possibility of a bad number and throw
return Integer.parseInt(resultColumns[0]);
}
};
GenericRawResults<Integer> rawResults =
getHelper().getMyProcessDao().queryRaw(
queryBuild.selectColumns("nid").prepareStatementString(), mapper);
List<Integer> list = rawResults.getResults();
Hi,
I'm developing an Eclipse plugin. I
need to find all the references in the
source using AST's or jdt.core.dom
or something like that. I need this
references like ASTNodes in order to
get the parent node and check several
things in the expression where
references are involved.
Thanks beforehand.
Edited:
I want to concrete a little more, My problem is that I try to catch some references to a constant but... I have not idea how I can do to catch in the matches this references. I need check the expressions which the references to a determined constant are involved. I only get the source of the method where they are used.
I think the problem is the scope or the pattern:
pattern = SearchPattern.createPattern(field, IJavaSearchConstants.REFERENCES);
scope = SearchEngine.createJavaSearchScope(declaringType.getMethods());
Thanks beforehand!
I used something like:
Search for the declaration of an
method, returns an IMethod
Search for references to the
IMethod, record those IMethods
For each IMethod returned, create an
AST from its compilation unit
Searching for declarations or references looks like the following code.
SearchRequestor findMethod = ...; // do something with the search results
SearchEngine engine = new SearchEngine();
IJavaSearchScope workspaceScope = SearchEngine.createWorkspaceScope();
SearchPattern pattern = SearchPattern.createPattern(searchString,
IJavaSearchConstants.METHOD, IJavaSearchConstants.DECLARATIONS,
SearchPattern.R_EXACT_MATCH);
SearchParticipant[] participant = new SearchParticipant[] { SearchEngine
.getDefaultSearchParticipant() };
engine.search(pattern, participant, workspaceScope, findMethod,
monitor);
Once you have your IMethod references, you can get to the AST using:
ASTParser parser = ASTParser.newParser(AST.JLS3);
parser.setResolveBindings(true);
if (methodToSearch.isBinary()) {
parser.setSource(methodToSearch.getClassFile());
} else {
parser.setSource(methodToSearch.getCompilationUnit());
}
CompilationUnit cu = (CompilationUnit) parser.createAST(null);
See http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.isv/guide/jdt_int_core.htm for more details on java search, the java model, and the AST.
I have a very simple mapping function called "BuildEntity" that does the usual boring "left/right" coding required to dump my reader data into my domain object. (shown below) My question is this - If I don't bring back every column in this mapping as is, I get the "System.IndexOutOfRangeException" exception and wanted to know if ado.net had anything to correct this so I don't need to bring back every column with each call into SQL ...
What I'm really looking for is something like "IsValidColumn" so I can keep this 1 mapping function throughout my DataAccess class with all the left/right mappings defined - and have it work even when a sproc doesn't return every column listed ...
Using reader As SqlDataReader = cmd.ExecuteReader()
Dim product As Product
While reader.Read()
product = New Product()
product.ID = Convert.ToInt32(reader("ProductID"))
product.SupplierID = Convert.ToInt32(reader("SupplierID"))
product.CategoryID = Convert.ToInt32(reader("CategoryID"))
product.ProductName = Convert.ToString(reader("ProductName"))
product.QuantityPerUnit = Convert.ToString(reader("QuantityPerUnit"))
product.UnitPrice = Convert.ToDouble(reader("UnitPrice"))
product.UnitsInStock = Convert.ToInt32(reader("UnitsInStock"))
product.UnitsOnOrder = Convert.ToInt32(reader("UnitsOnOrder"))
product.ReorderLevel = Convert.ToInt32(reader("ReorderLevel"))
productList.Add(product)
End While
Also check out this extension method I wrote for use on data commands:
public static void Fill<T>(this IDbCommand cmd,
IList<T> list, Func<IDataReader, T> rowConverter)
{
using (var rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
list.Add(rowConverter(rdr));
}
}
}
You can use it like this:
cmd.Fill(products, r => r.GetProduct());
Where "products" is the IList<Product> you want to populate, and "GetProduct" contains the logic to create a Product instance from a data reader. It won't help with this specific problem of not having all the fields present, but if you're doing a lot of old-fashioned ADO.NET like this it can be quite handy.
Although connection.GetSchema("Tables") does return meta data about the tables in your database, it won't return everything in your sproc if you define any custom columns.
For example, if you throw in some random ad-hoc column like *SELECT ProductName,'Testing' As ProductTestName FROM dbo.Products" you won't see 'ProductTestName' as a column because it's not in the Schema of the Products table. To solve this, and ask for every column available in the returned data, leverage a method on the SqlDataReader object "GetSchemaTable()"
If I add this to the existing code sample you listed in your original question, you will notice just after the reader is declared I add a data table to capture the meta data from the reader itself. Next I loop through this meta data and add each column to another table that I use in the left-right code to check if each column exists.
Updated Source Code
Using reader As SqlDataReader = cmd.ExecuteReader()
Dim table As DataTable = reader.GetSchemaTable()
Dim colNames As New DataTable()
For Each row As DataRow In table.Rows
colNames.Columns.Add(row.ItemArray(0))
Next
Dim product As Product While reader.Read()
product = New Product()
If Not colNames.Columns("ProductID") Is Nothing Then
product.ID = Convert.ToInt32(reader("ProductID"))
End If
product.SupplierID = Convert.ToInt32(reader("SupplierID"))
product.CategoryID = Convert.ToInt32(reader("CategoryID"))
product.ProductName = Convert.ToString(reader("ProductName"))
product.QuantityPerUnit = Convert.ToString(reader("QuantityPerUnit"))
product.UnitPrice = Convert.ToDouble(reader("UnitPrice"))
product.UnitsInStock = Convert.ToInt32(reader("UnitsInStock"))
product.UnitsOnOrder = Convert.ToInt32(reader("UnitsOnOrder"))
product.ReorderLevel = Convert.ToInt32(reader("ReorderLevel"))
productList.Add(product)
End While
This is a hack to be honest, as you should return every column to hydrate your object correctly. But I thought to include this reader method as it would actually grab all the columns, even if they are not defined in your table schema.
This approach to mapping your relational data into your domain model might cause some issues when you get into a lazy loading scenario.
Why not just have each sproc return complete column set, using null, -1, or acceptable values where you don't have the data. Avoids having to catch IndexOutOfRangeException or re-writing everything in LinqToSql.
Use the GetSchemaTable() method to retrieve the metadata of the DataReader. The DataTable that is returned can be used to check if a specific column is present or not.
Why don't you use LinqToSql - everything you need is done automatically. For the sake of being general you can use any other ORM tool for .NET
If you don't want to use an ORM you can also use reflection for things like this (though in this case because ProductID is not named the same on both sides, you couldn't do it in the simplistic fashion demonstrated here):
List Provider in C#
I would call reader.GetOrdinal for each field name before starting the while loop. Unfortunately GetOrdinal throws an IndexOutOfRangeException if the field doesn't exist, so it won't be very performant.
You could probably store the results in a Dictionary<string, int> and use its ContainsKey method to determine if the field was supplied.
I ended up writing my own, but this mapper is pretty good (and simple): https://code.google.com/p/dapper-dot-net/