BCL easyConverter SDK
easyConverter SDK Usermanual
PDF-to-HTML Programming API  |  Download Free Trial  |  Contact Us to Purchase

Native PHP API

In addition to the standard COM API, easyConverter SDK is also available as a native PHP API. The interface layer is written in 100% PHP 5 code. The API does not rely on any COM objects.

Although customers may freely study the full PHP source code, we strongly discourage everyone from making any modifications to this code. Note that the PHP layer is just an Application Binary Interface, which is subject to change without notice.

Usage

The native PHP API is a thin interface around a binary executable. It is very similar to the native .NET API, with the exception of some language-specific differences.

In order to use PDF2HTML, just import the library by adding require("PDF2HTML.php");. The PDF2HTML SDK is inside the BCL\easyConverter\HTML\ namespace. PDF2HTML.php can be found under C:\Program Files\BCL Technologies\easyConverter SDK 5\Html.

When an error occurs, an exception of type PDF2HTMLException is thrown.

The PDF2HTML class has a destructor, which means it is automatically disposed when the object goes out of scope. That makes memory management trivial, just make sure you are not holding on to the variable when you are no longer using the SDK.

If the customer's application crashes, the system automatically closes all pipes belonging to the process, which means all related worker processes automatically quit as well.

The minimal PHP sample code looks like this:

<?php
require("PDF2HTML.php");
$pdf2html = new BCL\easyConverter\HTML\PDF2HTML();
try
{
   $pdf2html->ConvertToHTML("c:\\test\\input.pdf", "c:\\test\\output.html");
}
catch(BCL\easyConverter\HTML\PDF2HTMLException $ex)
{
   echo $ex->getMessage(), "\n";
}
?>

PDF2HTML's constructor is designed to never throw exceptions. That's because it does not launch a worker process and does not create a named pipe, it merely initializes a few variables to their default values. In other words, creating a PDF2HTML object is extremely lightweight, like creating a Color object.

However, as soon as you do anything else, it instantly launches a worker process.

Notification Events

Notification events in the native PHP API are slightly different than in the native .NET API. Here is an example that catches OnPageStart, which is called before converting each page:

function handlePageStart($pageNumber, $pageCount, $fileName) { echo "Page ", $pageNumber, " of ", $pageCount, "...\n"; return BCL\easyConverter\HTML\cnvResponse::CNV_CONTINUE; }

$pdf2html = new BCL\easyConverter\HTML\PDF2HTML();
try
{
   $pdf2html->OnPageStart = handlePageStart;
   $pdf2html->ConvertToHTML("c:\\test\\input.pdf", "c:\\test\\output.html");
}
catch(BCL\easyConverter\HTML\PDF2HTMLException $ex)
{
   echo $ex->getMessage(), "\n";
}

Launch Timeout

Launching the worker process and connecting the named pipe should happen very fast, in milliseconds. However, under an abnormally heavy load, the computer may not have enough cycles to perform this task in a timely fashion.

The Native PHP API has an internal timeout built in. The default value is 1 minute. This is because a server may momentarily slow down so much that it is not responding for seconds, but it usually recovers after a while.

The default timeout value can be changed via PDF2HTML's launchTimeout member (in milliseconds). This must be performed immediately after the creation of the PDF2HTML object.

$pdf2html = new BCL\easyConverter\HTML\PDF2HTML();
try
{
   $pdf2html->launchTimeout = 60000;
   $pdf2html->ConvertToHTML("c:\\test\\input.pdf", "c:\\test\\output.html");
}
catch(BCL\easyConverter\HTML\PDF2HTMLException $ex)
{
   echo $ex->getMessage(), "\n";
}

Upon timeout an exception is thrown, and the SDK cannot be used. Another attempt may be made later.