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PHP Extension Writing
11
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typedef struct _zval_struct {
zvalue_value value;
zend_uint refcount;
zend_uchar type;
zend_uchar is_ref;
} zval; 
Full Reference
•Has a value of 1 (one)
•zval shared by 1 or more labels
•If one label wants to make a 
change, it does so, causing other 
labels to see the new value.
$a = 123;
$b = &$a;
value.lval = 123
refcount = 2
type = IS_LONG
is_ref = 1
$a
$b
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Online C# Tutorial to Insert, Delete and Update Fields in PDF Document
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Can save pdf form data - VB.NET PDF Field Edit library: insert, delete, update pdf form field in vb.net, ASP.NET, MVC, Ajax, WPF
How to Insert, Delete and Update Fields in PDF Document with VB.NET Demo Code
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PHP Extension Writing
12
Börger, Schlüter
typedef struct _zval_struct {
zvalue_value value;
zend_uint refcount;
zend_uchar type;
zend_uchar is_ref;
} zval; 
Full Reference
•Has a value of 1 (one)
•zval shared by 1 or more labels
•If one label wants to make a 
change, it does so, causing other 
labels to see the new value.
$a = 123;
$b = &$a;
$b = 456;
value.lval = 456
refcount = 2
type = IS_LONG
is_ref = 1
$a
$b
C# PDF File Merge Library: Merge, append PDF files in C#.net, ASP.
Append one PDF file to the end of another and save to a single PDF file. Thus, C#.NET PDF document merge library control can be counted as an efficient
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VB.NET PDF File Merge Library: Merge, append PDF files in vb.net
This library DLL can efficiently enable developers to merge two or more PDF document into one and then save as another PDF document using Visual Basic
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PHP Extension Writing
13
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Creating PHP 5 Extensions
þ
Most PHP 4 exts will build in PHP5 w/o Changes
þ
ext_skel can be used to generate a basic skeleton
marcus@zaphod src/php5/ext $ ./ext_skel --extname=util
Creating directory util
Creating basic files: config.m4 .cvsignore util.c php_util.h CREDITS 
EXPERIMENTAL tests/001.phpt util.php [done].
To use your new extension, you will have to execute the following steps:
1.  $ cd ..
2.  $ vi ext/util/config.m4
3.  $ ./buildconf --force
4.  $ ./configure --[with|enable]-util
5.  $ make
6.  $ ./sapi/cli/php -f ext/util/util.php
7.  $ vi ext/util/util.c
8.  $ make
Repeat steps 3-6 until you are satisfied with ext/util/config.m4 and
step 6 confirms that your module is compiled into PHP. Then, start 
writing code and repeat the last two steps as often as necessary.
Necessary for non cvs source 
(e.g. release packages)
C# PDF Convert to Word SDK: Convert PDF to Word library in C#.net
Quick to remove watermark and save PDF text, image, table, hyperlink and bookmark to Word without losing format. Password protected PDF file can be printed
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How to C#: Basic SDK Concept of XDoc.PDF for .NET
You can generate thumbnail image(s) from PDF file for quick viewing and further to load a PDF document from file or query data and save the PDF document.
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PHP Extension Writing
14
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Files in your extension
þ
You need at least two code files
þ php_yourext.h
The header needed by php
þ php_yourext.c
The main extension code
('php_' prefix for .c is not necessary)
þ
You need two configuration files
þ config.m4
Used under *nix
þ config.w32
Used under windows
þ
Optional files
þ .cvsignore
List of files to be ignored by CVS
þ CREDITS
First line ext name 2nd line all authors
þ EXPERIMENTAL If available the API is not yet stable
þ package2.xml
Required for PECL extensions
þ README
Probably good to provide some lines
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Form Process. Data: Read, Extract Field Data. Data: Auto Fill-in Field Data. Field: Insert NET RasterEdge WPF PDF Viewer, users can save PDF modifications and
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VB.NET PDF: Basic SDK Concept of XDoc.PDF
You can generate thumbnail image(s) from PDF file for quick viewing and further to load a PDF document from file or query data and save the PDF document.
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PHP Extension Writing
15
Börger, Schlüter
dnl $Id: $
dnl config.m4 for extension YOUREXT
PHP_ARG_ENABLE(yourext, enable YourExt suppport,
[  --enable-yourext
Enable YourExt], no)
if test "$PHP_YOUREXT" != "no"; then
AC_DEFINE(HAVE_YOUREXT, 1,[Whether YourExt is present])   
PHP_NEW_EXTENSION(yourext, php_yourext.c, $ext_shared)
fi 
config.m4
þ
PHP Dev is picky about coding style
þ Read CODING_STANDARDS in php-src
þ Watch your whitespace
þ Align your PHP_ARG_ENABLE output
þ
Make your extension default disabled
þ 'phpize' or 'pear install' will enable it automatically
VB.NET PDF Library SDK to view, edit, convert, process PDF file
Offer professional PDF document metadata editing APIs, using which VB.NET developers can redact, delete, view and save PDF metadata. PDF Document Protection.
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C# PDF Convert to Tiff SDK: Convert PDF to tiff images in C#.net
NET PDF to TIFF conversion control, C# developers can render and TIFF with specified zoom value and save it into The magnification of the original PDF page size
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PHP Extension Writing
16
Börger, Schlüter
config.m4
þ
You can prevent the ext from becoming shared
dnl $Id: $
dnl config.m4 for extension YOUREXT
PHP_ARG_ENABLE(yourext, enable YourExt suppport,
[  --enable-yourext
Enable YourExt], no)
if test "$PHP_YOUREXT" != "no";then
if test "$ext_shared" = "yes"; then
AC_MSG_ERROR(Cannot build YOUREXT as a shared module)
fi
AC_DEFINE(HAVE_YOUREXT,1,[Whether YourExt is present])   
PHP_NEW_EXTENSION(yourext, php_yourext.c, $ext_shared)
fi 
VB.NET PDF Page Extract Library: copy, paste, cut PDF pages in vb.
VB.NET: Extract PDF Pages and Save into a New PDF File. You can easily get pages from a PDF file, and then use these pages to create and output a new PDF file.
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C# PDF Page Delete Library: remove PDF pages in C#.net, ASP.NET
control SDK is a mature component on the market, which can also provides doc.Save(outPutFilePath Demo Code: How to Delete Consecutive Pages from PDF in C#.
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PHP Extension Writing
17
Börger, Schlüter
config.w32
þ
Windows configuration uses JScript
// $Id: $
// vim:ft=javascript
ARG_ENABLE("yourext", "YourExt support", "yes");
if (PHP_YOUREXT == "yes") {
if (PHP_YOUREXT_SHARED) {
ERROR("YOUREXT cannot be compiled as a shared ext");
} 
AC_DEFINE("HAVE_YOUREXT", 1, "YourExt support");
EXTENSION("yourext", "php_yourext.c");
} 
PHP Extension Writing
18
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Extension .h file
þ
Declares data for static linking and 
symbol exports
/* License, Author, CVS-Tag, Etc... */
#ifndef PHP_YOUREXT_H
#define PHP_YOUREXT_H
#include "php.h"
extern zend_module_entry yourext_module_entry;
#define phpext_yourext_ptr &yourext_module_entry
/* Only needed if you'll be exporting symbols */
#ifdef PHP_WIN32
# define YOUREXT_API __declspec(dllexport)
#else
# define YOUREXT_API
#endif
/* Place for globals definition */
#endif /* PHP_YOUREXT_H */
PHP Extension Writing
19
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Layout of the .c file
þ
Header: License, Authors, CVS-Tag, ...
þ
Includes
þ
Structures and defines not in header
þ
Helper Functions
þ
PHP Functions
þ
Globals Handling
þ
MINFO
þ
MINIT, MSHUTDOWN
þ
RINIT, RSHUTDOWN
þ
Function table
þ
Module Entry
PHP Extension Writing
20
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Includes
þ
Include path: 
þ <PHP Root>/
þ <PHP Root>/Zend
þ <PHP Root>/main
þ <PHP Root>/ext/<Your Extension>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "ext/standard/php_string.h"
#include "php_yourext.h" 
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