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Each of these classes represents a table name in the contacts.db database, and each table is responsible for describing its own URI structure. Plus, a corresponding Columns interface is defined for each class to identify the column names, such as PeopleColumns. Let s revisit the cursor that is returned: it contains zero or more records. Column names, order, and type are provider specific. However, every row returned has a default column called _id representing a unique ID for that row.

You can use the position information in the lexbuf to tell where you are in a file, which is the only way to know where a given error occurred. Unfortunately, there are no built-in commands that make accessing this information easier.

Before you access one, you should know a few things about an Android cursor: A cursor is a collection of rows. You need to use moveToFirst() because the cursor is positioned before the first row.

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import android.app.Activity; public class TestMultipartPost extends Activity { public void executeMultipartPost()throws Exception { try { InputStream is = this.getAssets().open("data.xml"); HttpClient httpClient = new DefaultHttpClient(); HttpPost postRequest = new HttpPost("http://192.178.10.131/WS2/Upload.aspx"); byte[] data = IOUtils.toByteArray(is); InputStreamBody isb = new InputStreamBody(new ByteArrayInputStream(data),"uploadedFile"); StringBody sb1 = new StringBody("someTextGoesHere"); StringBody sb2 = new StringBody("someTextGoesHere too"); MultipartEntity multipartContent = new MultipartEntity(); multipartContent.addPart("uploadedFile", isb); multipartContent.addPart("one", sb1); multipartContent.addPart("two", sb2); postRequest.setEntity(multipartContent); HttpResponse res =httpClient.execute(postRequest); res.getEntity().getContent().close(); } catch (Throwable e) { throw e; } } }

You need to know the column names. You need to know the column types. All field-access methods are based on column number, so you must convert the column name to a column number first. The cursor is a random cursor (you can move forward and backward, and you can jump). Because the cursor is a random cursor, you can ask it for a row count. An Android cursor has a number of methods that allow you to navigate through it. Listing 3 21 shows you how to check if a cursor is empty, and how to walk through the cursor row by row when it is not empty.

The lexing functions will throw a Failure exception if they encounter problems, but this error is often not as informative as you might hope. You can catch this error and (using the lexbuf position commands) try to recover. You can also report what exactly caused the error and treat it like a bug. When you are first writing a lexer (especially if it is complicated), this is probably the best way to handle this situation. Transition Table Size There is a limit of 32,767 transitions. If you exceed that limit, you will get an error such as this one: ocamllex: transition table overflow, automaton is too big. There are ways of reducing your automaton size, so you are not out of luck if you get this error. If you have a lexer with a huge number of keywords, you might want to use the following kind of function to handle it. This situation is quite common, and the function presented is the canonical way to handle the problem. You first must define a lookup table in the header. You can use whatever container you want to use. In this example, a hashtable is used. { let keywords = Hashtbl.create 100 (* load up the keyword table with the keyword to token mapping *) let _ = List.iter (fun (keyword, token) -> Hashtbl.replace keywords keyword token) [ "keyword1", KWD1; "keyword2", KWD2; (* all the keywords are not shown *) "keywordN", KWDN ] } rule token = parse ['A'-'Z' 'a'-'z']['A'-'Z' 'a'-'z' '0'-'9' '_']* as id { try Hashtbl.find keyword_table id with Not_found -> STRING(id) }

Listing 3 21. Navigating Through a Cursor Using a while Loop if (cur.moveToFirst() == false) { //no rows empty cursor return; } //The cursor is already pointing to the first row //let's access a few columns int nameColumnIndex = cur.getColumnIndex(People.NAME); String name = cur.getString(nameColumnIndex); //let's now see how we can loop through a cursor while(cur.moveToNext()) { //cursor moved successfully //access fields }

Note The multipart example uses several .jar files that are not included as part of the Android runtime. To

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