Windows上PHP扩展的实现,部署及应用

2019独角兽企业重金招聘Python工程师标准>>>

PHP对扩展的编写要求非常严格。如果没有按照官方文档，使用对应的PHP版本，PHP源码版本，以及Visual Studio版本，即使能够在Windows上成功编译DLL，也会因为版本不匹配报错，从而无法运行。之前只写了如何编写扩展，这里会分享下如何使用Nginx+PHP+DBR（Dynamsoft Barcode Reader）来搭建一个简单的Web条形码应用。

参考原文：How to Create a Web Barcode Reader App with PHP and Nginx

作者：Xiao Ling

翻译：yushulx

软件下载

Nginx
PHP
Dynamsoft Barcode Reader SDK

步骤1：PHP Barcode扩展实现

使用Dynamsoft Barcode SDK来快速创建一个PHP扩展php_dbr.dll。具体步骤可以参考：使用C/C++编写PHP Extension。

步骤2：PHP扩展部署和环境配置

把生成的php_dbr.dll拷贝到%PHP%\ext中。

把DynamsoftBarcodeReaderx86.dll拷贝到%PHP%根目录下。

打开%php%\php.ini文件添加扩展描述：

extension=php_dbr.dll

如果有文件上传的需求，可以修改一下最大文件上传的尺寸：

upload_max_filesize=20M

步骤3：如何在Nginx中配置PHP

为了让Nginx支持PHP，打开%nginx%\conf\nginx.conf添加：

location ~ \.php$ {root           html;fastcgi_pass   127.0.0.1:9000;fastcgi_index  index.php;fastcgi_param  SCRIPT_FILENAME <Your Web App Folder>/$fastcgi_script_name;include        fastcgi_params;}

如果上传文件尺寸太大，会出现下面的错误：

nginx 413 Request Entity Too Large

这个时候需要修改Nginx配置：

client_max_body_size 50M;

步骤4：Web条形码应用

创建index.php：

<!DOCTYPE html>
<html>
<head><title>Dynamsoft PHP Barcode Reader</title><script src="jquery-1.11.3.min.js"></script><script src="tiff.min.js"></script>
</head>
<body>
<H1>Dynamsoft PHP Barcode Reader</H1>
<form action="dbr.php" method="post" enctype="multipart/form-data">Select barcode image:<input type="file" name="readBarcode" id="readBarcode" accept="image/*"><br><input type="submit" value="Read Barcode" name="submit">
</form>
<div id="tiff"></div>
<div id='image'></div>
<script>function reset() {$("#image").empty();$("#tiff").empty();}var input = document.querySelector('input[type=file]');input.onchange = function() {reset();var file = input.files[0];var fileReader = new FileReader();// get file extensionvar extension = file.name.split('.').pop().toLowerCase();var isTiff = false;if (extension == "tif" || extension == "tiff") {isTiff = true;}fileReader.onload = function(e) {if (isTiff) {console.debug("Parsing TIFF image...");//initialize with 100MB for large filesTiff.initialize({TOTAL_MEMORY: 100000000});var tiff = new Tiff({buffer: e.target.result});var tiffCanvas = tiff.toCanvas();$(tiffCanvas).css({"max-width": "800px","width": "100%","height": "auto","display": "block","padding-top": "10px"}).addClass("TiffPreview");$("#tiff").append(tiffCanvas);}else {var dataURL = e.target.result, img = new Image();img.src = dataURL;$("#image").append(img);}}if (isTiff) {fileReader.readAsArrayBuffer(file);}elsefileReader.readAsDataURL(file);}
</script></body>
</html>

为了支持tiff文件的加载显示，我们可以使用tiff js library.。

创建dbr.php用于接收上传文件，并且调用PHP条形码扩展接口来解码：

<?php
// create absolute file path
function file_build_path(...$segments) {return join(DIRECTORY_SEPARATOR, $segments);
}
$file = basename($_FILES["readBarcode"]["name"]);
echo "<p>$file</p>";
if ($file != NULL && $file != "") {// get current working directory$root = getcwd();// tmp dir for receiving uploaded barcode images$tmpDir = "uploads/";if (!file_exists($tmpDir)) {mkdir($tmpDir);}$target_file = $tmpDir . basename($_FILES["readBarcode"]["name"]);$isSuccessful = true;$fileType = pathinfo($target_file,PATHINFO_EXTENSION);if (!$isSuccessful) {echo "Fail to read barcode";} else {if (move_uploaded_file($_FILES["readBarcode"]["tmp_name"], $target_file)) {// dynamsoft barcode reader$path = file_build_path($root, $target_file);/** Description:* array DecodeBarcodeFile( string $filename , bool $isNativeOutput [, bool $isLogOn ] )** Return Values:* If barcode detected, $array[0] is an array.*/$resultArray = DecodeBarcodeFile($path, false);if (is_array($resultArray[0])) {$resultCount = count($resultArray);echo "Total count: $resultCount\n";for($i = 0; $i < $resultCount ; $i++) {$result = $resultArray[$i];echo "<p>Barcode format: $result[0], value: $result[1]</p>";}}else {echo "<p>$resultArray[0]</p>";}// delete the uploaded barcode imageunlink($path);} else {echo "Fail to read barcode.";}}
}
?>

运行php-cgi：

%php%\php-cgi.exe -b 127.0.0.1:9000 -c %php%\php.ini

运行Nginx：

%nginx%\nginx.exe

打开localhost:8080/index.php:做测试：

源码

https://github.com/dynamsoftsamples/php-barcode-reader

转载于:https://my.oschina.net/yushulx/blog/547333