ASP.NET PDF Viewer using C#, VB/NET

exit 1 let directory = args[1] let pattern = args[2] for fileName in Directory.GetFiles(directory, pattern) do // Open a file stream for the file name use inputReader = File.OpenText(fileName) // Create a lex buffer for use with the generated lexer. The lex buffer // reads the inputReader stream. let lexBuffer = Lexing.from_text_reader Encoding.ASCII inputReader // Open an output channel let outputFile = Path.ChangeExtension(fileName,"html") use outputWriter = (new StreamWriter(outputFile) :> TextWriter) // Write the header fprintfn outputWriter "<html>\n<head></head>\n<pre>" // Run the generated lexer Text2htmllex.convertHtml outputWriter lexBuffer // Write the footer fprintfn outputWriter "</pre>\n</html>\n" do main() You can produce an F# source file from the previous lexer definition by running this: fslex text2htmllex.fsl This produces text2htmllex.fs, which contains the implementation of the lexer convertHtml. This lexer is imperative, in that it prints to an output stream instead of returning tokens. The signature of the entry point to the generated lexer is as follows:

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import; import; import; import java.sql.PreparedStatement; import java.sql.CallableStatement; import java.sql.ResultSet; import oracle.sql.BLOB; import book.util.JDBCUtil; import book.util.Util; class DemoBlobOperations { public static void main(String args[]) { Util.checkProgramUsage( args ); Connection conn = null; try { // following gets connection; sets autocommit to true conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); We invoke the following three methods in the main() method: _readBlob(): Reads a BLOB value _writeBlob(): Writes to a BLOB value, replacing the characters from the beginning _appendToBlob(): Appends a string value to a BLOB At the end of main() method, we commit the changes: _readBlob( conn ); _writeBlob( conn ); _appendToBlob( conn ); conn.commit(); } catch (Exception e) { JDBCUtil.printExceptionAndRollback(conn, e ); } finally { // release resources associated with JDBC in the finally clause. JDBCUtil.close( conn ); } }

The old tried and true. This handler is responsible for mapping the URL of the request for an ASPX page to the type that services the request. Provides a page directive infrastructure to simplify the mapping of a requested URL to a custom handler (see the Creating an Http Handler section that follows). This handler simply streams the file requested to the client. It s what IIS would do by default. The advantage to this handler is that requests for static content (HTM, JPG, GIF, and so forth) can be mapped to the Framework; therefore, requests for these files go through the entire Http pipeline. This strategy can be used to secure static content when using Forms-based security. The Web Services handler. Depending on the request type and URL, this handler generates the testing interface, generates Web Services Description Language (WSDL) documents, and takes Simple Object Access Protocol (SOAP) messages off the wire and invokes the appropriate method on an instance of the type described in the request. The remoting handler. Takes SOAP or binary streams off the wire, invokes the method, and serializes the .NET type back to the caller. This handler simply returns an HTTP status of 403, causing a Forbidden file type extension to be raised on the client. It s a simple way to secure files of certain types on the server. Do you have an XML architecture where all eXtensible Stylesheet Language Transformation (XSLT) is done on the server Map *.xml to this handler and no one can pull down the raw XML that lives on your server.

The method _readBlob() begins by declaring variables outside the try catch block: /* demos how to read from a BLOB in the database. */ private static void _readBlob( Connection conn ) throws SQLException, IOException { PreparedStatement pstmt = null; ResultSet rset = null; InputStream byteStream = null; try { We declare our query string that selects the BLOB column whose length is 4,000 bytes from the table blob_table: String stmtString = "select blob_col from blob_table "+ " where id = "; pstmt = conn.prepareStatement( stmtString ); pstmt.setInt( 1, 1 ); rset = pstmt.executeQuery(); while( ) { To read a BLOB, we first use the method getBlob() in the ResultSet interface. We then use the standard method getBinaryStream() in the Blob interface to get an InputStream. Finally, we use standard Java streams functionality to get the data as follows (note how we convert the resulting byte array to a String by using the appropriate String constructor to display the ASCII characters): BLOB blob = (BLOB) rset.getBlob( 1 ); byteStream = blob.getBinaryStream(); byte [] byteArray= new byte [10]; int numOfBytesRead = 0; int bytesRead = -1; while( (bytesRead = byteArray ) ) != -1 ) { System.out.print( new String(byteArray, 0, bytesRead)); numOfBytesRead += bytesRead; } System.out.println("total bytes read: " + numOfBytesRead ); } } finally { if( byteStream != null ) byteStream.close(); JDBCUtil.close( pstmt); JDBCUtil.close( rset); } }

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