libxml2里如何实现xml的对齐的格式化输出

wenlq

文档里说的怎么不起效果呢。
新增节点都是连在一起的
Function: xmlDocDumpFormatMemory
void        xmlDocDumpFormatMemory                (xmlDocPtr cur,                                          xmlChar ** mem,                                          int * size,                                          int format)
Dump an XML document in memory and return the #xmlChar * and it's size. It's up to the caller to free the memory with xmlFree(). Note that @format = 1 provide node indenting only if xmlIndentTreeOutput = 1 or xmlKeepBlanksDefault(0) was called

cur: the document
mem: OUT: the memory pointer
size: OUT: the memory length
format: should formatting spaces been added

Function: xmlSaveFormatFileEnc
int        xmlSaveFormatFileEnc                (const char * filename,                                          xmlDocPtr cur,                                          const char * encoding,                                          int format)
Dump an XML document to a file or an URL.

filename: the filename or URL to output
cur: the document being saved
encoding: the name of the encoding to use or NULL.
format: should formatting spaces be added.
Returns: the number of bytes written or -1 in case of error. Note that @format = 1 provide node indenting only if xmlIndentTreeOutput = 1 or xmlKeepBlanksDefault(0) was called

[ 本帖最后由 wenlq 于 2008-2-28 17:02 编辑 ]

wenlq

经过测试可以通过了。

xmlSaveCtxtPtr 那种方式是xmllint --format 时采用的方式。

1. 
   
2.     #include <stdio.h>
   
3. 
   
4.     #include <string.h>
   
5. 
   
6.     #include <iconv.h>
   
7.     #include <libxml/tree.h>
   
8.     #include <libxml/xmlsave.h>
   
9.     #include <libxml/parser.h>
   
10.     #include <libxml/xpath.h>
    
11.     #include <libxml/xpathInternals.h>
    
12. 
    
13. int main(int argc,char** argv)
    
14. {
    
15.     xmlDocPtr doc;
    
16.     xmlSaveCtxtPtr ctxt;
    
17.     int saveOpts = 0;
    
18. 
    
19.     if(argc<2)
    
20.     {
    
21.      printf("argc must be 2 or above.\n");
    
22.      return -1;
    
23.     }
    
24.     xmlKeepBlanksDefault(0);
    
25. 
    
26.     doc = xmlParseFile(argv[1]);
    
27.     if (doc == NULL)
    
28.     {
    
29.         printf("Error: unable to parse file: [%s]\n",argv[1]);
    
30.         return -1;
    
31.     }
    
32.     xmlSaveFormatFileEnc("ll",doc,doc->encoding,1);
    
33. 
    
34.     saveOpts |= XML_SAVE_FORMAT;
    
35.     ctxt = xmlSaveToFilename(argv[2] ? argv[2]:"-", doc->encoding, saveOpts);
    
36.     if (ctxt != NULL) {
    
37.         if (xmlSaveDoc(ctxt, doc) < 0) {
    
38.             fprintf(stderr, "failed save to %s\n", argv[2]);
    
39.         }
    
40.         xmlSaveClose(ctxt);
    
41.     }
    
42.     else {
    
43.             fprintf(stderr, "failed save to %s\n", argv[2]);
    
44.     }
    
45. 
    
46.     xmlFreeDoc(doc);
    
47.     xmlCleanupParser();
    
48.     return 0;
    
49. 
    
50. }
    
51. 
    
52. 
    

复制代码

wenlq

补充一点，新增节点时，
如
  <hello>
    <nn1>
      <OKKK>Oktest</OKKK>
      <what>what ....what </what>
    </nn1>
    <nn2>hellotext2</nn2>
    <nn3>hellotext3</nn3>
  </hello>
新增节点hello,nn1,以下函数的最后参数content要用NULL,不能用空串“”。否则就变连一起了。

1. 
   
2. <hello><nn1><OKKK>Oktest</OKKK><what>what ....what </what></nn1><nn2>hellotext2</nn2><nn3>hellotext3</nn3></hello>

复制代码

xmlNodePtr xmlNewChild(xmlNodePtr parent,  xmlNsPtr ns,
const xmlChar * name, const xmlChar * content)

[ 本帖最后由 wenlq 于 2008-3-14 14:18 编辑 ]