PHP传递C结构数据throught socket编程 [英] php passing c struct data throught socket programming

问题描述

如何让一个PHP套接字客户端需要执行socket_sendto到Linux下C插槽服务器，具有以下结构

How to make a php socket client that needs to perform socket_sendto to linux C socket server which has following struct

typedef struct
{
  UI2             todo;   
  char            rz[LNG_RZ + 1]; 
  char            saId[LNG_SAT_ID + 1]; 
  char            user[LNG_USER + 1]; 
  char            lang[LANGLEN + 1]; 
  SI4             result;       
  UI4             socket;  
  char            text[LNG_ALLG + 1]; 
  char            filename[MAX_PATHLEN];
}  dmsAuf_Head;        

显然，PHP被称为不支持结构如何传递C数据使用PHP插座

Obviously, PHP is known not to support struct how can I pass the c data to socket using php

我知道有一招用，使C结构对象下方的方法：

I know there is a trick to make c struct object using the method below:

class dmsAuf_Head {
  public            todo;            
  public            rz    
  public            saId    
  public            user    
  public            lang    
  public            result;                         
  public            socket;        
  public            text   
  public            filename 
}

$obj = new dmsAuf_Head();

，但这不会采取属性的尺寸的关心？任何recommnedation？

but this would not take care of the size of the attribute? Any recommnedation?

如何在发送前serialzied一切???

How to serialzied everything before sending???

建议，由交流电插座服务器的开发人员，他们正在使用下面的C code发送值到c socket服务器：

As proposed by the developer of the c socket server, they are using the following c code to send value to the c socket server:

 rval = send(dms_aufHead->socket, (char *) dms_aufHead, sizeof(dmsAuf_Head), 0);

所以，我怎么能发送使用PHP，而不是dms_aufHead数据？

So how can I send dms_aufHead data using php instead?

建议，由交流电插座服务器的开发人员，他们正在使用下面的C code发送值到c socket服务器：

As proposed by the developer of the c socket server, they are using the following c code to send value to the c socket server:

rval = send(dms_aufHead->socket, (char *) dms_aufHead, sizeof(dmsAuf_Head), 0);

所以，我怎么能发送使用PHP，而不是dms_aufHead数据？

So how can I send dms_aufHead data using php instead?

如果（例如）$ Rz为什么只有3炭（对于这种情况下），而不是13 char用作期望的长度？我应该怎么输出PHP？

What if (for example) $rz is only 3 char(for this case) instead of 13 char as desired length? what should I output for PHP?

推荐答案

您需要 FWRITE 中的数据以正确的顺序。在包功能将非常有用。

You'll need to fwrite the data in the proper order. The pack function will be useful.

http://us2.php.net/pack

fwrite($sock, pack('v', 0x1234)); // send a 16 bit integer

当然，你有关于如何的C结构是建立（填充等），目标机器期待字节顺序，依此类推要小心。

Of course you have to be careful regarding how the C structure is built (padding, etc), the endianness the target machine is expecting, and so on.

由于所有的，它通常是两个系统更好地简单地读/写所需的数据顺序，并在手动结构（由字段字段）填写，而不是试图的fread / fwrite的结构本身作为一个大块。在PHP端，它可能看起来像：

Because of all that, it is usually better for both systems to simply read/write the data needed sequentially and fill in the structures manually (field by field), as opposed to trying to fread/fwrite the structure itself as one big block. On the PHP side, it may look like:

class dmsAuf_Head {
  public            $todo;            
  public            $rz;    
  public            $saId;    
  public            $user;    
  public            $lang;    
  public            $result;                         
  public            $socket;        
  public            $text;   
  public            $filename; 

  public function send($sock)
  {
    fwrite($sock, pack('v', $this->todo));
    // .. fwrite the rest
  }
}

$foo = new dmsAuf_Head();
$foo->send($sock);

（注意，你可以建立一个单一的打包字符串并把它在一个去，如果你使用多个参数。）

(Note that you can build a single packed string and send it all in one go if you use multiple arguments.)

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