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Explanation in .NET Get pdf417 2d barcode in .NET Explanation




How to generate, print barcode using .NET, Java sdk library control with example project source code free download:
Explanation using .net toget pdf417 in asp.net web,windows application Microsoft Excel 1. The user-defi .net framework barcode pdf417 ned filehandle FOO will be used to send output from your Perl script to the UNIX command tr, which will translate lowercase letters to uppercase.

. 2. The print fun ction sends the string hello there to the output filter filehandle FOO; that is, the string is piped to the tr command. The string, after being filtered, will be sent to the screen with all the characters translated to uppercase.

Example 10.22..

(The Text File) PDF417 for .NET $ cat emp.names 1 Steve Blenheim 2 Betty Boop 3 Igor Chevsky 4 Norma Cord 5 Jon DeLoach 6 Karen Evich (The Script) #!/usr/bin/perl 1 open(FOO, ".

sort +1 tr "[a-z]" "[A- PDF417 for .NET Z]""); # Open output filter 2 open(DB, "emp.names"); # Open DB for reading 3 while(<DB>){ print FOO ; } 4 close FOO; (Output) 2 BETTY BOOP 3 IGOR CHEVSKY 5 JON DELOACH 6 KAREN EVICH 4 NORMA CORD 1 STEVE BLENHEIM.

Explanation 1. The user-defi pdf417 2d barcode for .NET ned filehandle FOO will be used to pipe output to the UNIX command sort, and the output of sort will be piped to the tr command.

The sort +1 command sorts on the second field, where fields are words separated by whitespace. The UNIX tr command translates lowercase letters into uppercase letters..

2. The open function creates the filehandle DB and attaches it to the UNIX file emp.names. 3. The expressio .net framework pdf417 2d barcode n in the while loop contains the filehandle DB, enclosed in angle brackets, indicating a read operation.

The loop will read the first line from the emp.names file and store it in the $_ scalar variable. The input line will be sent through the output filter, FOO, and printed to the screen.

The loop will iterate until end of file is reached. Note that when the file is sorted by the second field, the numbers in the first column are no longer sorted..

4. The close function closes the filehandle FOO. Sending the Output of a Filter to a File In the previous example, what if you had wanted to send the output of the filter to a file intead of to STDOUT You can"t send output to a filter and a filehandle at the same time, but you can redirect STDOUT to a filehandle. Since, later in the program, you may want STDOUT to be redirected back to the screen, you can first save it or simply reopen STDOUT to the terminal device by typing open(STDOUT, ">/dev/tty"); Example 10.23.

. #!/usr/bin/perl # Program to redirect STDOUT from filter to a UNIX file $ = 1; # Flush bu ffers $tmpfile = "temp"; open(DB, "data") . die qq/Can"t op pdf417 for .NET en "data": $!\n/; # Open DB for reading open(SAVED, ">&STDOUT") . die "$!\n"; # S ave stdout open(STDOUT, ">$tmpfile" ) . die "Can"t open visual .net pdf417 2d barcode : $!\n"; open(SORT, ". sort +1") . die; # Open out .net framework pdf417 2d barcode put filter while(<DB>){ print SORT; # Output is first sorted and then sent to temp. } close SORT; open(STDOUT, ">&SAVED") .

die "Can"t open "; print "Here we are printing to the screen again.\n"; # This output will go to the screen rename("temp","data");. 1 2 3 4 5 6 7 8 9 10 11 12 13. Explanation 1. The $ variable guaran tees an automatic flush of the output buffer after each print statement is executed. (See autoflush module in Appendix A.).

2. The scalar $tmpfile is assigned temp to be used later as an output file. 3. The UNIX data file is opened for reading and attached to the DB filehandle. 4. STDOUT is bei .NET PDF-417 2d barcode ng copied and saved in another filehandle called SAVED.

Behind the scenes, the file descriptors are being manipulated.. 5. The temp file is being opened for writing and is assigned to the file descriptor normally reserved for STDOUT, the screen. The file descriptor for STDOUT has been closed and reopened for temp.

. 6. The output fi VS .NET PDF417 lter will be assigned to SORT.

Perl"s output will be sent to the UNIX sort utility. . 7. The DB filehandle is opened for reading. 8. The output filehandle will be sent to the temp file after being sorted. 9. Close the loop. 10. Close the output filter. 11. Open the standard output filehandle so that output is redirected back to the screen. 12. This line prints to the screen because STDOUT has been reassigned there. 13. The temp file is renamed data, overwriting what was in data with the contents of temp. Input Filter When creating a filehandle with the open function, you can also open a filter so that input is piped into Perl. The command ends with a pipe symbol..

Format open(FILEHANDLE, COMMAND ); Example 10.24. 1 2 3 4. #!/bin/perl # Scriptname: infilter open(INPIPE, "date "); $today = < ;INPIPE> "; print $today; close(INPIPE);. # Windows (2000/NT) use:.
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