ASP.NET Web PDF Document Viewer/Editor Control Library

Figure 2-17. The Http Handlers section of ASP .NET configuration within the MMC IIS snap-in This tool, when used in the context of a specific IIS application, generates an entry in the web.config file of that application. From within Visual Studio .NET, open the web.config and you can see the entry the configuration tool has made: <httpHandlers> <add path="*.dom" verb="*" type="DomHandler" /> </httpHandlers> Now make a request for any file with a DOM extension from within the IIS application. The dynamically generated image using the filename should appear. This handler can now be used from within any application as the src attribute of an image tag.

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UTL_FILE.FCLOSE: This procedure closes an open file. The syntax is UTL_FILE.FCLOSE ( file IN OUT FILE_TYPE ); The parameter is as follows: file: An active file handle returned by an FOPEN call Now we are ready to look at some working examples. First, we create a directory object under which the files will be manipulated by UTL_FILE: benchmark@ORA10G> create or replace directory my_dir as 'C:\TEMP'; We then declare the buffer and file handle variables: benchmark@ORA10G> declare 2 l_buffer varchar2(32767); 3 l_file_handle utl_file.file_type; We open the file test_bfile.txt in read mode with a maximum line size of 256: 4 5 begin l_file_handle := utl_file.fopen( 'MY_DIR', 'test_bfile.txt', 'R', 256 );

> SimpleTokensLex.token lexbuf;; val it : SimpleTokensLex.token = EOF > SimpleTokensLex.token lexbuf;; Microsoft.FSharp.Core.FailureException: End of file on lexing stream

Then in a loop we invoke UTL_FILE.GET_LINE() to get each line and print it out. At the end of the file, the exception NO_DATA_FOUND is raised, at which point we invoke the UTL_FILE.FCLOSE() method to close the file. 7 8 9 10 11 12 13 14 15 This This This This loop utl_file.get_line( l_file_handle, l_buffer ); dbms_output.put_line( l_buffer ); end loop; exception when no_data_found then utl_file.fclose( l_file_handle ); end; / is a test. is line number 2. is line number 3. is the final line.

Summary

Lexers generated by fslex keep track of partial information about the position of the most recently accepted token within the source stream of characters. In particular, the StartPos and EndPos properties on the LexBuffer type return Lexing.Position values. A partial signature of this position type is as follows: type Position with // The file name associated with the input stream. member FileName : string // The line number in the input stream, assuming fresh // positions have been updated by modifying the EndPos // property of the LexBuffer as each newline is lexed. member Line : int // The character number in the input stream member AbsoluteOffset : int // The column number marked by the position. member Column : int // Convert a position just beyond the end of a line to a // position at the start of the next line. member NextLine : position ... end In some cases, certain lexer actions must perform extra bookkeeping. In particular, the lexer should update the EndPos property of the LexBuffer each time a newline marker is processed (this is left up to the lexer since the interpretation of newline characters can differ between various lexers). In particular, you can change the endOfLine rule in the lexer in Listing 16-3 to make this update: | newline { lexbuf.EndPos <- lexbuf.EndPos.NextLine; token lexbuf }

PL/SQL procedure successfully completed. Next we write to a file. We create a new file called my_file.txt automatically by opening the file in write mode and use UTL_FILE.PUT_LINE to put some lines in the file. Finally, we close the file by invoking the UTL_FILE.FCLOSE() function. The code is as follows: benchmark@ORA10G> declare 2 l_buffer varchar2(32767); 3 l_file_handle utl_file.file_type; 4 begin

You can now experiment with this updated lexer in F# Interactive and examine the StartPos and EndPos properties after fetching each token:

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The ASP .NET Framework is a completely extensible application hosting architecture that is hosted by Internet Information Server (IIS). The main points of extensibility are pre- and post-processors in the request pipeline, and the capability to associate HTTP handlers with different URL patterns. Dozens of hooks are provided to extend the pipeline. These hooks can be trapped using either a type that inherits from HttpApplication or by implementing the IHttpModule interface.