和Python,JavaScript等高级语言一样,PHP也可以通过C/C++编写扩展功能。这里分享下如何构建一个简单的PHP扩展,以及如何调用第三方DLL库。
参考原文:Making PHP Barcode Extension with Dynamsoft Barcode SDK
使用Visual Studio 2012构建PHP扩展
Windows PHP的安装包本身不包涵头文件,所以要构建PHP扩展,必须下载PHP的源码。在Windows上,要编译PHP,以及构建PHP扩展都必须使用对应的Visual Studio,不然会出现大量的错误。在这里我们使用Visual Studio 2012去构建PHP 5.6的扩展。步骤如下:
下载PHP 5.6的源码以及VC11 build版本。
创建一个空的Win32工程,应用类型选择DLL。
添加头文件路径:
F:\php_pack\php-5.6.10-srcF:\php_pack\php-5.6.10-src\ZendF:\php_pack\php-5.6.10-src\win32F:\php_pack\php-5.6.10-src\TSRMF:\php_pack\php-5.6.10-src\main
添加库路径:
F:\php_pack\php-5.6.10-Win32-VC11-x86\dev
添加依赖:
php5ts.lib
创建php_dbr.h:
#pragma once #include "zend_config.w32.h" #include "php.h"
创建php_dbr.cpp:
#include "php_dbr.h" ZEND_FUNCTION(DecodeBarcodeFile); zend_function_entry CustomExtModule_functions[] = { ZEND_FE(DecodeBarcodeFile, NULL) {NULL, NULL, NULL}}; zend_module_entry CustomExtModule_module_entry = { STANDARD_MODULE_HEADER, "Dynamsoft Barcode Reader", CustomExtModule_functions, NULL, NULL, NULL, NULL, NULL, NO_VERSION_YET, STANDARD_MODULE_PROPERTIES}; ZEND_GET_MODULE(CustomExtModule) ZEND_FUNCTION(DecodeBarcodeFile){ RETURN_STRING("No Barcode detected", true);}
添加宏定义:
ZEND_DEBUG=0ZTS=1ZEND_WIN32PHP_WIN32
如果不添加,会出现很多错误。
现在build工程就可以生成php_dbr.dll了。
使用Dynamsoft Barcode SDK创建PHP Barcode Extension
来看一下如何通过PHP扩展调用第三方的DLL库:
添加Dynamsoft Barcode SDK的头文件和库文件路径到工程属性中
通过SDK的C/C++接口解码Barcode,并把结果转换成PHP可读数据:
#include "php_dbr.h" #include "If_DBR.h"#include "BarcodeFormat.h"#include "BarcodeStructs.h"#include "ErrorCode.h" #ifdef _WIN64#pragma comment(lib, "DBRx64.lib")#else#pragma comment(lib, "DBRx86.lib")#endif void SetOptions(pReaderOptions pOption, int option_iMaxBarcodesNumPerPage, int option_llBarcodeFormat){ if (option_llBarcodeFormat > 0) pOption->llBarcodeFormat = option_llBarcodeFormat; else pOption->llBarcodeFormat = OneD; if (option_iMaxBarcodesNumPerPage > 0) pOption->iMaxBarcodesNumPerPage = option_iMaxBarcodesNumPerPage; else pOption->iMaxBarcodesNumPerPage = INT_MAX; } ZEND_FUNCTION(DecodeBarcodeFile); zend_function_entry CustomExtModule_functions[] = { ZEND_FE(DecodeBarcodeFile, NULL) {NULL, NULL, NULL}}; zend_module_entry CustomExtModule_module_entry = { STANDARD_MODULE_HEADER, "Dynamsoft Barcode Reader", CustomExtModule_functions, NULL, NULL, NULL, NULL, NULL, NO_VERSION_YET, STANDARD_MODULE_PROPERTIES}; ZEND_GET_MODULE(CustomExtModule) ZEND_FUNCTION(DecodeBarcodeFile){ array_init(return_value); // Get Barcode image path char* pFileName = NULL; int iLen = 0; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &pFileName, &iLen) == FAILURE) { RETURN_STRING("Invalid parameters", true); } // Dynamsoft Barcode Reader: init int option_iMaxBarcodesNumPerPage = -1; int option_llBarcodeFormat = -1; pBarcodeResultArray pResults = NULL; ReaderOptions option; SetOptions(&option, option_iMaxBarcodesNumPerPage, option_llBarcodeFormat); // decode barcode image file int ret = DBR_DecodeFile( pFileName, &option, &pResults ); if (ret == DBR_OK) { int count = pResults->iBarcodeCount; pBarcodeResult* ppBarcodes = pResults->ppBarcodes; pBarcodeResult tmp = NULL; // loop all results for (int i = 0; i < count; i++) { tmp = ppBarcodes[i]; // convert format type to string char format[64]; sprintf (format, "%d", tmp->llFormat); // (barcode type, result) add_assoc_string(return_value, format, tmp->pBarcodeData, 1); } // Dynamsoft Barcode Reader: release memory DBR_FreeBarcodeResults(&pResults); } else { RETURN_STRING("No Barcode detected", true); } }
现在我们需要写一个PHP的测试脚本,并把DLL部署到PHP中。
一个简单的PHP Barcode Reader:
<?php $filename = "F:\\git\\Dynamsoft-Barcode-Reader\\Images\\AllSupportedBarcodeTypes.tif"; if (file_exists($filename)) { echo "Barcode file: $filename \n"; $resultArray = DecodeBarcodeFile($filename); if (is_array($resultArray)) { foreach($resultArray as $key => $value) { print "format:$key, result: $value \n"; print "*******************\n"; } } else { print "$resultArray"; } } else { echo "The file $filename does not exist";} ?>
打开php.ini初始化文件,加入:
[Dynamsoft Barcode Reader]extension=php_dbr.dll
现在要把生成的DLL拷贝到{PHP root directory}\ext。如果你同时把DynamsoftBarcodeReaderx86.dll也拷贝到这个目录下,PHP会找不到这个DLL,报出如下错误:
如何修复这个问题?你只要把第三方的DLL拷贝到PHP根目录下即可。现在再试一次:
源码
https://github.com/yushulx/Dynamsoft-Barcode-Reader/tree/master/samples/PHP

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