Part III Running Web Applications in VS .NET

Creator PDF 417 in VS .NET Part III Running Web Applications
Part III Running Web Applications
Recognize PDF417 In .NET
Using Barcode Control SDK for .NET Control to generate, create, read, scan barcode image in VS .NET applications.
The first time you access http://your_server_name/firstone, the module is run for the first time and the $callCounter variable is incremented Subsequent calls (via your browser s refresh button) increase the request count The count is only increasing for the child process that is servicing your request, however Another child process starts the counter from zero; the $callCounter is really not shared among the child processes In other words, although the module code is shared among the Apache children, the data is not shared Whenever the SimpleAPIpm module is called, Apache passes a request object called $r to the handler() method The handler() method acts as the point-of-entry for the module Code outside the method is only executed if the hander() method directly or indirectly requires it For example, in the following code, method_one() and method_two() are called because handler() requires them:
Creating PDF417 In .NET Framework
Using Barcode printer for Visual Studio .NET Control to generate, create PDF 417 image in Visual Studio .NET applications.
sub handler { my $r = shift; method_one(); method_two(); return OK; } sub method_one { # something useful } sub method_two { # something useful }
PDF417 Reader In .NET Framework
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
The handler() method must return an Apache status code such as OK, DECLINED, DONE, NOT_FOUND, FORBIDDEN, AUTH_REQUIRED, or SERVER_ERROR You can find a complete list of Apache status constants in the Constantspm file supplied with mod_perl Use the locate Constantspm command to locate the file, or use your system s file finder utility to locate it On Linux systems running Perl 560, the file path is /usr/lib/perl5/site_perl/ 560/i386-linux/Apache/Constantspm
Barcode Encoder In .NET
Using Barcode maker for VS .NET Control to generate, create barcode image in Visual Studio .NET applications.
Using CGIpm to Write mod_perl Modules
Barcode Scanner In Visual Studio .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Most people who use Perl with Apache know how to use the CGIpm module for writing CGI scripts in Perl Thankfully, the CGIpm author realized that people who are used to using this module might want to still use it in a non-CGI environment
PDF-417 2d Barcode Generator In Visual C#
Using Barcode generator for VS .NET Control to generate, create PDF 417 image in .NET framework applications.
16 Using Perl with Apache
PDF417 Encoder In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create PDF 417 image in ASP.NET applications.
such as mod_perl, so the module s author made sure that this module is very usable under mod_perl For example, Listing 16-2 shows a CGIpm version of the SimpleAPIpm module, which is now called SimpleAPIUsingCGIpm
Creating PDF417 In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create PDF 417 image in Visual Studio .NET applications.
Listing 16-2: A Simple Example that Uses a CGIpm Module in a mod_perl Module
Draw USS Code 128 In Visual Studio .NET
Using Barcode maker for .NET framework Control to generate, create Code 128B image in VS .NET applications.
package Development::SimpleAPIUsingCGI; use strict; use Apache::Constants qw(:common); use CGI (-compile: all); my $callCounter = 0; sub handler { my $query = new CGI; print $query->header; print $query->start_html( Simple Perl API Example Using CGIpm ), $query->h1( Simple Perl API Example Using CGIpm Module ), $query->hr, $query->p( Process ID: $$ ), $query->p( Request count: $callCounter ), $query->hr, $query->end_html; $callCounter++; return OK; } 1;
USS-128 Printer In VS .NET
Using Barcode creation for VS .NET Control to generate, create EAN / UCC - 14 image in .NET framework applications.
Avid CGIpm developers will notice that I used the -compile: all option when telling Perl that I want to use the CGIpm module Here Perl is told to compile all CGIpm code once during the initial loading of the module during server startup This ensures that all CGIpm features are readily available to the SimpleAPIUsingCGIpm module No more time will be necessary to compile any CGIpm-specific code during a request cycle Of course, if you do not use a lot of features of CGIpm, you can use
Bar Code Printer In .NET Framework
Using Barcode printer for .NET Control to generate, create barcode image in Visual Studio .NET applications.
Part III Running Web Applications
UPC - 8 Creation In Visual Studio .NET
Using Barcode generation for .NET Control to generate, create EAN8 image in .NET framework applications.
CGI qw(-compile :standard), or CGI qw(-compile :standard :html3), and so on, to reduce memory usage by CGIpm itself Remember that keeping a lot of unused code in memory wastes your system resources
Code 39 Creation In VB.NET
Using Barcode maker for VS .NET Control to generate, create Code 39 image in Visual Studio .NET applications.
Also notice that the CGI object, $query, is created within the handler() method This is necessary because if you create a CGI object outside the handler() method in the global section of the module, such as the $callCounter, the object will be created once for the first request and it will only have that request s information For example, if you move the my $query = new CGI; line outside of the handler() method and place it right after the my $callCounter = 0; line, the script will treat each subsequent request after the initial request as the same request Thus, if you need to access the query string information using the $query->param() method, you will only get the data for the first request because the $query object is not created for each request This is why it is very important that you create the request-specific $query object within the handler() method as shown in Listing 16-2 The SimpleAPIUsingCGIpm module provides the same functionality as the SimpleAPIpm and can be run via the http://your_server_name/cgipm_example URL after you add the following lines to httpdconf and restart the server:
Making EAN-13 Supplement 5 In VS .NET
Using Barcode printer for ASP.NET Control to generate, create EAN / UCC - 13 image in ASP.NET applications.
# Configuration for running mod_perl modules PerlModule Development::SimpleAPIUsingCGI <Location /cgipm_example> SetHandler perl-script PerlHandler Development::SimpleAPIUsingCGI </Location>
Printing UCC - 12 In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create UCC - 12 image in ASP.NET applications.
Barcode Drawer In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Create EAN / UCC - 14 In Visual C#
Using Barcode generation for Visual Studio .NET Control to generate, create GS1-128 image in .NET applications.
DataMatrix Printer In VS .NET
Using Barcode creation for ASP.NET Control to generate, create ECC200 image in ASP.NET applications.