Ubuntu上轻松实现PHP扩展

对比Windows，Linux上实现PHP扩展要简单轻松的多。

参考原文：How to Make PHP Barcode Reader on Linux

作者：Xiao Ling

翻译：yushulx

几步构建PHP Barcode扩展

安装DBR。

要构建PHP扩展，一定要使用对应版本的源码：

php –v

下载PHP源码。

解压代码，切换到ext目录：

cd ~/Downloads/php-5.5.9/ext

创建扩展dbr:

./ext_skel --extname=dbrcd dbr

编辑config.m4，添加头文件和库文件路径：

PHP_ARG_ENABLE(dbr, whether to enable dbr support, dnl Make sure that the comment is aligned: [  --enable-dbr           Enable dbr support]) if test "$PHP_DBR" != "no"; then   PHP_ADD_LIBRARY_WITH_PATH(DynamsoftBarcodeReaderx64, /home/xiao/Dynamsoft/BarcodeReader4.0/Redist, DBR_SHARED_LIBADD)    PHP_ADD_INCLUDE(/home/xiao/Dynamsoft/BarcodeReader4.0/Include)   PHP_SUBST(DBR_SHARED_LIBADD)   PHP_NEW_EXTENSION(dbr, dbr.c, $ext_shared) fi

编辑dbr.c:

#ifdef HAVE_CONFIG_H#include "config.h"#endif #include "php.h"#include "php_ini.h"#include "ext/standard/info.h"#include "php_dbr.h" #include "If_DBR.h"#include "BarcodeFormat.h"#include "BarcodeStructs.h"#include "ErrorCode.h"#include  /* If you declare any globals in php_dbr.h uncomment this:ZEND_DECLARE_MODULE_GLOBALS(dbr)*/ /* True global resources - no need for thread safety here */static int le_dbr; /* {{{ dbr_functions[] * * Every user visible function must have an entry in dbr_functions[]. */const zend_function_entry dbr_functions[] = {    PHP_FE(DecodeBarcodeFile,   NULL)       /* For testing, remove later. */    PHP_FE_END  /* Must be the last line in dbr_functions[] */};/* }}} */ /* {{{ dbr_module_entry */zend_module_entry dbr_module_entry = {#if ZEND_MODULE_API_NO >= 20010901    STANDARD_MODULE_HEADER,#endif    "dbr",    dbr_functions,    PHP_MINIT(dbr),    PHP_MSHUTDOWN(dbr),    PHP_RINIT(dbr),     /* Replace with NULL if there's nothing to do at request start */    PHP_RSHUTDOWN(dbr), /* Replace with NULL if there's nothing to do at request end */    PHP_MINFO(dbr),#if ZEND_MODULE_API_NO >= 20010901    PHP_DBR_VERSION,#endif    STANDARD_MODULE_PROPERTIES};/* }}} */ #ifdef COMPILE_DL_DBRZEND_GET_MODULE(dbr)#endif /* {{{ PHP_INI *//* Remove comments and fill if you need to have entries in php.iniPHP_INI_BEGIN()    STD_PHP_INI_ENTRY("dbr.global_value",      "42", PHP_INI_ALL, OnUpdateLong, global_value, zend_dbr_globals, dbr_globals)    STD_PHP_INI_ENTRY("dbr.global_string", "foobar", PHP_INI_ALL, OnUpdateString, global_string, zend_dbr_globals, dbr_globals)PHP_INI_END()*//* }}} */ /* {{{ php_dbr_init_globals *//* Uncomment this function if you have INI entriesstatic void php_dbr_init_globals(zend_dbr_globals *dbr_globals){    dbr_globals->global_value = 0;    dbr_globals->global_string = NULL;}*//* }}} */ /* {{{ PHP_MINIT_FUNCTION */PHP_MINIT_FUNCTION(dbr){    /* If you have INI entries, uncomment these lines     REGISTER_INI_ENTRIES();    */    return SUCCESS;}/* }}} */ /* {{{ PHP_MSHUTDOWN_FUNCTION */PHP_MSHUTDOWN_FUNCTION(dbr){    /* uncomment this line if you have INI entries    UNREGISTER_INI_ENTRIES();    */    return SUCCESS;}/* }}} */ /* Remove if there's nothing to do at request start *//* {{{ PHP_RINIT_FUNCTION */PHP_RINIT_FUNCTION(dbr){    return SUCCESS;}/* }}} */ /* Remove if there's nothing to do at request end *//* {{{ PHP_RSHUTDOWN_FUNCTION */PHP_RSHUTDOWN_FUNCTION(dbr){    return SUCCESS;}/* }}} */ /* {{{ PHP_MINFO_FUNCTION */PHP_MINFO_FUNCTION(dbr){    php_info_print_table_start();    php_info_print_table_header(2, "dbr support", "enabled");    php_info_print_table_end();     /* Remove comments if you have entries in php.ini    DISPLAY_INI_ENTRIES();    */}/* }}} */ // Barcode formatconst char * GetFormatStr(__int64 format){    if (format == CODE_39)        return "CODE_39";    if (format == CODE_128)        return "CODE_128";    if (format == CODE_93)        return "CODE_93";    if (format == CODABAR)        return "CODABAR";    if (format == ITF)        return "ITF";    if (format == UPC_A)        return "UPC_A";    if (format == UPC_E)        return "UPC_E";    if (format == EAN_13)        return "EAN_13";    if (format == EAN_8)        return "EAN_8";    if (format == INDUSTRIAL_25)        return "INDUSTRIAL_25";    if (format == QR_CODE)        return "QR_CODE";    if (format == PDF417)        return "PDF417";    if (format == DATAMATRIX)        return "DATAMATRIX";     return "UNKNOWN";} PHP_FUNCTION(DecodeBarcodeFile){    array_init(return_value);     // Get Barcode image path    char* pFileName = NULL;    bool isNativeOuput = false;    bool isLogOn = false;    int iLen = 0;     if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sb|b", &pFileName, &iLen, &isNativeOuput, &isLogOn) == FAILURE) {        RETURN_STRING("Invalid parameters", true);    }     if (isLogOn)    {        printf("params: %s, %d, %d\n", pFileName, iLen, isNativeOuput);    }     // Dynamsoft Barcode Reader: init    __int64 llFormat = (OneD | QR_CODE | PDF417 | DATAMATRIX);    int iMaxCount = 0x7FFFFFFF;    int iIndex = 0;    ReaderOptions ro = {0};    pBarcodeResultArray pResults = NULL;    int iRet = -1;    char * pszTemp = NULL;     // Initialize license    iRet = DBR_InitLicense("84D34246FC1BC4BDD4078D71FCB5A3AA");    printf("DBR_InitLicense ret: %d\n", iRet);    ro.llBarcodeFormat = llFormat;    ro.iMaxBarcodesNumPerPage = iMaxCount;     // Decode barcode image    int ret = DBR_DecodeFile(pFileName, &ro, &pResults);    if (ret == DBR_OK)    {        int count = pResults->iBarcodeCount;        pBarcodeResult* ppBarcodes = pResults->ppBarcodes;        pBarcodeResult tmp = NULL;        char result[2048] = {0};        int i = 0;        if (count == 0)        {            add_next_index_string(return_value, "No Barcode detected", true);        }         // loop all results        for (; i < count; i++)        {            char barcodeResult[1024];             // A barcode result.            tmp = ppBarcodes[i];            {                // Working with PHP array: http://php.com/manual/en/internals2.variables.arrays.php                zval *tmp_array;                // Initialize zval                MAKE_STD_ZVAL(tmp_array);                array_init(tmp_array);                // Add format & value to an array                add_next_index_string(tmp_array, GetFormatStr(tmp->llFormat), true);                add_next_index_string(tmp_array, tmp->pBarcodeData, true);                // Add result to returned array                add_next_index_zval(return_value, tmp_array);            }        }         // Dynamsoft Barcode Reader: release memory        DBR_FreeBarcodeResults(&pResults);         if (isLogOn && isNativeOuput)        {            printf("Native result: %s\n", result);        }         if (isNativeOuput)        {            add_next_index_string(return_value, result, true);        }    }    else    {        add_next_index_string(return_value, "No Barcode detected", true);    } }

要独立构建PHP扩展模块，需要使用phpize。安装开发包：

sudo apt-get install php5-dev

构建PHP扩展模块：

phpize./configuremake

C90规范不支持布尔类型。如果看到错误“unknown type name ‘bool’”，加上头文件：

#include 

动态链接库dbr.so会自动生成到目录modules下面：

简单的PHP Barcode应用

创建reader.php:

安装刚才编译出来的扩展：

sudo make install

把安装之后的路径(/usr/lib/php5/20121212/dbr.so)加入到php.ini文件中：

locate php.ini

通过命令找寻php.ini文件会发现有好几个相关的。到底用哪个呢？可以随便选一个或者新建一个。我选择了php.ini-production ：

extension=/usr/lib/php5/20121212/dbr.so

运行PHP barcode reader，记得带上php.ini的文件路径：

php -c /usr/share/php5/php.ini-production reader.php

源码

https://github.com/dynamsoftlabs/linux-php-barcode-reader-