Xu ,
There can be 3 approaches for sending the XML file / contents thru
network
1) FTP the Xml File
2) Send the XML as a String Buffer using libxml2 APIs
3) Send a fixed size buffer which reads the Xml file at Source (
line by line or of a buffer size ) in a Loop till EOF is encountered.
Use the 3rd Approach if Xml file to send is quite large.
-------------------- Approach 2 ---------------------
In the 2nd approach at the Sender 1st get xmlDocPtr of the Xml by using
xmlParseFile(const char* filename
Then pass it to the API xmlDocDumpFormatMemory(xmlDocPtr ptrXMLDoc,
xmlChar** pmemXmlbuff, int* pnBufSize, int nFormat)
Pass nFormat = 1 to get the Indented representation of the XML string.
Say I have the Buffer & Size Vars as ........
xmlChar *xmlbuff;
int nBuffersize;
I use the above API like
xmlDocDumpFormatMemory(xmlParseFile("XMLFileName.xml"), &xmlbuff,
&nBuffersize,1)
Sender can then send this data to the client in 2 steps.
First it sends the size of the XML bufer ..... Something like......
char dataBuf[1024];
memset( data,0,sizeof(data) );
sprintf( data,"%d", nBuffersize);
send (SOCKET(Windows) or SD(Unix), (const char*) data , sizeof(data), 0
);
Reciever then collects the size of the XML Buffer
recv(SOCKET(Windows) or SD(Unix), (const char*) data , sizeof(data), 0
);
int nBufSize = atoi(data);
Once he has the size he can do
char* pXmlBuf = new char[nBufSize];
Sender now sends the whole XmlBuffer
if ( nBuffersize > 0 )
send (SOCKET(Windows) or SD(Unix),(const char*)xmlbuff
,nBuffersize, 0 );
Remember also to free the XML buffer at the sender
xmlFree(xmlbuff);
Reciever now gather this XML buffer.....
recv(SOCKET(Windows) or SD(Unix), pXmlBuf, sizeof(nBufSize), 0 );
Once Reciever has both he can Parse the In-Memory XML buf using
xmlParseMemory(pXmlBuf , nBufSize).
-------------------- Approach 3 ---------------------
I guess u r using this approach to send a fix size buffer by reading Xml
file at source using File API.
U send it in a loop till EOF is encountered.
In the reciever u r using a loop to recv all data & parsing.
In the 1st call xmlParseMemory() works fine , but in 2nd since Xml Data
send is not from start but somewhere from middle so
xmlParseMemory() fails
Alternatively u can keep on appending data to a file & later parse that
using xmlParseFile() which works allright.
[xml] xmlParseMemory() problem
________________________________
* From: "Xu Xiaogang-a19881" <nickxu motorola com>
* To: <xml gnome org>
* Subject: [xml] xmlParseMemory() problem
* Date: Sun, 1 Jun 2008 18:12:34 +0800
________________________________
size=2 width="100%" align=center>
Hi Experts,
I am using xmlParseMemory() to parse the content retrieved from the
network, which is not well formatted.
xmlParseMemory() can work for the first call.
But if I create a loop to keep parsing the content continuously,
this function will return NULL from the second call. If I save the
content to a file, and use xmlParseFile() to parse the contents in the
same loop. It can work. The libxml2 lib I use is libxml2-2.6.30 on
Window XP.
I am not sure whether there is more clean work than xmlFreeDoc()
when using xmlParseMemory().
Regards
-Xiaogang
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