使用C/C++编写PHP Extension

WBOY
Release: 2016-06-23 13:32:36
Original
1869 people have browsed it

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
Copy after login

添加库路径:

F:\php_pack\php-5.6.10-Win32-VC11-x86\dev
Copy after login

添加依赖:

php5ts.lib
Copy after login

创建php_dbr.h

#pragma once #include "zend_config.w32.h"    #include "php.h"
Copy after login

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);}
Copy after login

添加宏定义:

ZEND_DEBUG=0ZTS=1ZEND_WIN32PHP_WIN32
Copy after login

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);    } }
Copy after login

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";} ?>
Copy after login

打开php.ini初始化文件,加入:

[Dynamsoft Barcode Reader]extension=php_dbr.dll
Copy after login

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


Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template