SWIG typedef 识别 [英] SWIG typedef recognition

问题描述

我也尝试在 PHP 中使用我的 C++ 类.在我的 C++ 代码中，我将 typedef 声明为:

I am trying too use my C++ class in PHP. in my C++ code I have declared the typedef as:

typedef unsigned char byte;

所以我打算让 SWIG 在包装类中考虑我的 typedef，我的接口文件是这样的:

so I intended to let SWIG consider my typedef in wrapper class, my interface file is something like this:

%module xxx

typedef unsigned char byte;

%include "xxx.h"

....

%{

typedef unsigned char byte;

#include "xxx.h"

%}

在我的测试代码中，我将类型称为:

and in my test code I refer to type as:

byte *data;

但我有以下错误:

Fatal error: Class 'unsigned_char' not found in xxx.php

P.S:我也在我的接口文件中包含了stdint.i"，但得到了同样的错误

P.S: I also include "stdint.i" in my interface file but got the same error

有什么想法吗?

推荐答案

我可以确认您展示的界面是可行的并且适用于简单的情况，例如我写了下面的头文件来测试:

I can confirm that the interface you've shown is viable and works for simple cases, e.g. I wrote the following header file to test:

byte *make() { return NULL; }
void consume(byte *data) {}

并使用了接口:

%module xxx

typedef unsigned char byte;

%include "xxx.h"

%{
typedef unsigned char byte;

#include "xxx.h"
%}

我能够使用以下 PHP 编译和测试:

Which I was able to compile and test with the following PHP:

<?php
include("xxx.php");
$r = xxx::make();
xxx::consume($r);
?>

它按预期工作.

有几点需要注意:

1. 一般来说，我倾向于编写您想要传递给模块的代码(即 %{ %} 中的位在 %include 之前.
2. 我倾向于使用标准的 int 类型之一，而不是为 byte 使用您自己的 typedef，例如uint8_t

3. 从你的问题中不清楚你打算如何使用 byte *data - 大概它是一个数组，在这种情况下你会想要 向您的界面添加更多代码.(或者最好仍然使用 std::vector 因为它是 C++):

1. In general I would be inclined to write the code you want passed through to the module (i.e. the bits inside the %{ %} before your %include.
2. Rather than using your own typedef for byte I'd be inclined to use one of the standard int types, e.g. uint8_t

3. It's not clear from your question quite how you intend to use byte *data - presumably it's an array in which case you'll want to add a little more code to your interface. (Or better still use std::vector<byte> since it's C++):

%module xxx

%{
typedef unsigned char byte;

#include "xxx.h"
%}

%include <carrays.i>

%array_class(byte,ByteArray);

typedef unsigned char byte;

%include "xxx.h"

然后可以在 PHP 中用作:

Which can then be used in PHP as:

$a = new ByteArray(100);
$a->setitem(0, 1);
$a->setitem(1, 2); //...
xxx::consume($a->cast());

ByteArray 是 SWIG 提供的实用程序类，用于保存和包装 byte 的原始 C 数组.

ByteArray is a utility class provided by SWIG to hold and wrap a raw C array of bytes.

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