minixml3.1库的使用

大家好，这几天我使用minixml 3.1库解析了xml格式数据，由于是头一次使用，且时间比较紧，总结的比较简陋。

libmxml.so解析xml数据时的内存布局如下图，以下面简单例子说明：

加载方式为：mxmlLoadString(NULL, pacData, MXML_OPAQUE_CALLBACK);

采用 MXML_OPAQUE_CALLBACK方式，跟采用MXML_NO_CALLBACK、MXML_TEXT_CALLBACK方式是不一样的

 

解析代码如下：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iconv.h>
#include "mxml.h"

#define EL_RESP               "Response"
#define EL_CMDTYPE            "CmdType"
#define EL_NAME               "Name"
#define EL_DEVICEID           "DeviceID"

int parsexml(char *pacData)
{
    mxml_node_t *root = mxmlLoadString(NULL, pacData, MXML_OPAQUE_CALLBACK);
    mxml_node_t    *resp = mxmlFindElement(root, root, EL_RESP, NULL, NULL, MXML_DESCEND_FIRST);
    mxml_node_t    *node = NULL;
    char* pkey[] = { EL_CMDTYPE, EL_NAME, EL_DEVICEID };
    int i = 0, icount =sizeof(pkey) / sizeof(pkey[0]);
    node = mxmlFindElement(resp, root, pkey[0], NULL, NULL, MXML_DESCEND_FIRST);
    for(; i < icount; i++)
    {
        mxml_node_t* child = mxmlGetFirstChild(node);
        const char* pvalue = mxmlGetOpaque(node);
        const char* pvalue1 = mxmlGetOpaque(child);
        printf("*** %d. %s:[%s] [%s]
", i+1, pkey[i], pvalue, pvalue1);
        node = mxmlFindElement(node, root, pkey[i + 1], NULL, NULL, MXML_NO_DESCEND);
    }
    
    return 0;
}

int main(int argc, char* argv[])
{
    char *cfgpath = "./ljt.xml";
    FILE* pfile = fopen(cfgpath, "r");
    if(NULL == pfile)
    {
        printf("*** failed to open file %s
", cfgpath);
        return 0;
    }
    char acData[1500] = { 0 };
    fseek(pfile, 0, SEEK_END);
    long long llsize = ftell(pfile);
    fseek(pfile, 0, SEEK_SET);
    fread(acData, llsize, 1, pfile);
    fclose(pfile);
    printf("*** filesize = %lld
", llsize);
    printf("%s
", acData);
    
    parsexml(acData);

    return 0;
}