我設法解析ok。但現在我無法獲得我需要的值 。我可以獲取元素和屬性。但無法獲得價值。 我想獲得在該XML框架的價值是20使用xml解析器獲取xml數據expat
/* track the current level in the xml tree */
static int depth = 0;
/* first when start element is encountered */
void start_element(void *data, const char *element, const char **attribute)
{
int i;
for(i = 0; i < depth; i++)
{
printf(" ");
}
printf("%s", element);
for(i = 0; attribute[i]; i += 2)
{
printf(" %s= '%s'", attribute[i], attribute[i + 1]);
}
printf("\n");
depth++;
}
/* decrement the current level of the tree */
void end_element(void *data, const char *el)
{
depth--;
}
int parse_xml(char *buff, size_t buff_size)
{
FILE *fp;
fp = fopen("start_indication.xml", "r");
if(fp == NULL)
{
printf("Failed to open file\n");
return 1;
}
XML_Parser parser = XML_ParserCreate(NULL);
int done;
XML_SetElementHandler(parser, start_element, end_element);
memset(buff, 0, buff_size);
printf("strlen(buff) before parsing: %d\n", strlen(buff));
size_t file_size = 0;
file_size = fread(buff, sizeof(char), buff_size, fp);
/* parse the xml */
if(XML_Parse(parser, buff, strlen(buff), XML_TRUE) == XML_STATUS_ERROR)
{
printf("Error: %s\n", XML_ErrorString(XML_GetErrorCode(parser)));
}
fclose(fp);
XML_ParserFree(parser);
return 0;
}
<data>
<header length="4">
<item name="time" type="time">16</item>
<item name="ref" type="string">3843747</item>
<item name="port" type="int16">0</item>
<item name="frame" type="int16">20</item>
</header>
</data>
Output from parsing
Element: data
Element: header length= '4'
Element: item name= 'time' type= 'time'
Element: item name= 'ref' type= 'string'
Element: item name= 'port' type= 'int16'
Element: item name= 'frame' type= 'int16'
在方法「handle_data」 malloc的大小應爲長度+ 1。 – Hyndrix 2014-02-03 17:37:25