libxml2如何解析xml格式的字符串-白红宇

libxml2如何解析xml格式的字符串

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发布时间：2019-05-25

本文共 2749 字，大约阅读时间需要 9 分钟。

libxml2

xmlReadMemory

xmlParseMemory

网上的大部分关于xml的文章都是处理xml文件的，就没直接处理xml字符串的说明。

下面是用libxml2解析xml格式的字符串的函数顺序：

1. xmlParseMemory，字符串转为XML文档

2. xmlDocGetRootElement，获取XML文档根节点

3. xmlStrcmp，比较XML字符串，与strcmp差不多

4. curr = curr->xmlChildrenNode，节点指针指向第一个子节点

5. curr = curr->next，XML节点指针指向下一个兄弟节点

6. xmlNodeGetContent，获取XML节点的内容

7. xmlFreeDoc，释放节点，与free差不多

贴段代码作为参考：

#include 
   
      #include 
    
       #include 
     
          #include "soapH.h"  #include "ExchangeRateWebServiceSoap12.nsmap"    #define FIELD_LEN 16    int conv_charset(const char *dest, const char *src, char *input, size_t ilen, char *output, size_t olen) {      iconv_t conv = iconv_open(dest, src);      if ( conv == (iconv_t) -1 )          return -1;      memset(output, 0, olen);      if ( iconv(conv, &input, &ilen, &output, &olen) )          return -1;      iconv_close(conv);      return 0;  }    int main(int argc, char **argv) {      if ( argc != 2 && argc != 3 ) {          printf("Usage: %s type [end_point]\n", argv[0]);          printf("\ttype = A : all rate\n");          printf("\ttype = B : basic rate\n");          printf("\ttype = C : cross rate\n");          exit(-1);      }        struct soap soap;      soap_init(&soap);      // don't set is OK      //soap_set_mode(&soap, SOAP_C_UTFSTRING);        struct _ns1__getExchangeRate request;      struct _ns1__getExchangeRateResponse response;        request.theType = argv[1];      char *endpoint = NULL;      if ( argc == 3 )          endpoint = argv[2];      if ( soap_call___ns3__getExchangeRate(&soap, endpoint, NULL, &request, &response) == SOAP_OK ) {          int len = strlen(response.getExchangeRateResult->__any);          xmlDocPtr pdoc = xmlParseMemory(response.getExchangeRateResult->__any, len);          xmlNodePtr root = xmlDocGetRootElement(pdoc);          xmlNodePtr curr = root;          while ( xmlStrcmp(curr->name, (const xmlChar *) "getExchangeRate") )              curr = curr->xmlChildrenNode;          for ( curr = curr->xmlChildrenNode; curr; curr = curr->next ) {              xmlNodePtr data;              for ( data = curr->xmlChildrenNode; data; data = data->next ) {                  char ifield[FIELD_LEN];                  char ofield[FIELD_LEN];                  strcpy(ifield, xmlNodeGetContent(data));                  if ( conv_charset("GBK", "UTF-8", ifield, strlen(ifield), ofield, FIELD_LEN) )                      printf("%s\t%s\n", data->name, ifield);                  else                      printf("%s\t%s\n", data->name, ofield);              }              printf("\n");          }          xmlFreeDoc(pdoc);      }      else {          soap_print_fault(&soap, stderr);      }    //    soap_destroy(&soap);      soap_end(&soap);      soap_done(&soap);      return 0;  }