痛饮的PHP包装使用指针，C code是一个数组 [英] swig-php wrapper uses pointer, c code is an array

问题描述

我使用痛饮生成一个PHP扩展调用到一个C共享库。我能得到最多的事除了以下情况，工作...

I am using SWIG to generate a PHP extension that calls into a 'c' shared lib. I am able to get most things to work except the following situation...

在我的'C'code我宣布一个函数（请注意，结构和功能的名称已更改为保护无辜者）：

In my 'c' code I declare a function as (Please note that structure and function names have been changed to protect the innocent):

int getAllThePortInfo(EthernetPort *ports);

在此情况下，参数的端口的实际上是EthernetPort结​​构的阵列。在另一个'C'节目，我可以把它称为像这样...

In this case, the parameter ports is actually an array of EthernetPort structures. In another 'c' program, I could have called it like this...

EthernetPort ports[4];
int rval = getAllThePortInfo(ports);
<etc>
<etc>

这工作正常。然后我跑痛饮，我生成共享库，以及所有建立良好。我让PHP code，我可以打电话...

This works fine. Then I run SWIG, generate my shared lib, and all builds well. I get php code that I can call...

$ports = new_ethernetport();
$rval = getAllThePortInfo($ports);

这会导致PHP抛出以下错误： PHP：免费（）：无效的指针：0x099cb610

This causes PHP to throw the following error : php: free(): invalid pointer: 0x099cb610

所以，我试图做这样的事情...

So, I tried to do something like...

$ports = array(new_ethernetport(), new_ethernetport(), new_ethernetport(), new_ethernetport());
$rval = getAllThePortInfo($ports);

但随后PHP抱怨......
PHP致命错误：在getAllThePortInfo的参数1类型错误。预计SWIGTYPE_p_EthernetPort

我认为正在发生的是，PHP（和痛饮）不指针与数组之间的区别，并在包装​​，它是想指向一个单一结构的时候，在现实中，它是一个结构数组。

What I think is happening is that PHP (and SWIG) do not differentiate between pointers and arrays, and in the wrapper, it is thinking 'pointer to a single structure', when, in reality, it is an array of structures.

有什么在PHP中我能做什么？分配的内存块，我可以为存储多个结构的空间使用？

Is there something in PHP I can do? Allocate a chunk of memory that I can use as a space to store more than one structure?

是否与痛饮东西我可以做，使我的包装明白了我的意图更好？

Is there something with SWIG I can do to make my wrapper understand my intentions better?

我真的会AP preciate任何建议。谢谢你。

I truly would appreciate any suggestions. Thanks.

推荐答案

carrays.i答案的确抱到我的问题...

carrays.i indeed hold the answer to my question...

在痛饮接口文件，我有以下行...

In the SWIG interface file, I have the following lines...

%include <carrays.i>
%array_functions(EthernetPort, ethernetPortArray);
%include "my_lib.h"

my_lib.h包含EthernetPort结​​构的typedef，以及函数声明...

"my_lib.h" contains the typedef for the EthernetPort structure, as well as the function declaration...

#define NUM_ETHERNET_PORTS 4

typedef struct {
    int number;
    mode_t mode;
} EthernetPort;

int getAllThePortInfo(EthernetPort *ports);

运行SWIG和建立共享库后的 my_lib.so ，我可以使用下面的PHP code ...

After running SWIG and building the shared lib my_lib.so, I can use the following PHP code...

$ports = new_ethernetPortArray(NUM_ETHERNET_PORTS);
$rval = getAllThePortInfo($ports);

$port0 = ethernetPortArray_getitem($ports, 0);
$pnum = ethernetport_number_get($port1);
$pmode = ethernetport_mode_get($port1);

// port1 port2 port3 etc etc 

delete_ethernetPortArray($ports);

PHP函数的 new_ethernetPortArray ethernetPortArray_getitem ethernetport_number_get ethernetport_mode_get delete_ethernetPortArray 全部由痛饮基础上创建的.i文件。

The php functions new_ethernetPortArray, ethernetPortArray_getitem, ethernetport_number_get, ethernetport_mode_get, delete_ethernetPortArray were all created by SWIG based on the .i file.

另一个好处SWIG能是利用＃在我的PHP code（例如NUM_ETHERNET_PORTS）定义的，让我为我的一些常见的数据一个地方。我喜欢。 ： - ）

The other benefit SWIG enables is the use of #define's in my php code (e.g. NUM_ETHERNET_PORTS), allowing me a single place for some of my common data. I like that. :-)

干杯。

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