使用Matlab读取JSON对象 [英] Read JSON objects with Matlab

问题描述

我想使用Matlab从json文件中读取内容，并将所有内容作为对象存储在数据"中.导入后，如果对象中可用，我需要遍历所有对象并提取特定值.

I want to read from a json file with Matlab and store everything in "data" as objects. After import, I need to iterate through all and extract specific values, if it's available in the object.

JSON(源):

{
    "eid": 44000, 
    "dpm_id": {
        "dpm": "fm", 
        "pwr": "main"
    }, 
    "fpga_id": 3189637128, 
    "fpga_ver": 3104379702, 
    "boot_id": 0, 
    "pbs_ver": "PBS 2012-05-07 16:41"
}
{
    "sid": 1, 
    "hk1": {
        "bela_mode": "pbs_mode", 
        "pbs_version": "version 1.3", 
        "scet": "2038-01-19T03:14:08", 
        "ref_time": "0:00:00", 
        "tc_received": 2, 
        "tc_exec": 2, 
        "tc_err_ack": 0, 
        "tc_err_exec": 1, 
        "tm_total": 1, 
        "tm_sent": 1, 
        "tm_dropped": 0,
        ....

Matlab(导入，

Matlab (import, according to this website, resp. Class):

fname = 'FileName.json';
fid = fopen(fname);
raw = fread(fid,inf);
str = char(raw');
fclose(fid);

data = JSON.parse(str)

问题/问题:

如您所见，Matlab仅读取第一个方括号/字段的内容.即使我不知道有多少个括号/字段，我该如何导入?

As you see, Matlab only reads the content of the first brackets/field. How can I import ALL brackets/fields, even if I don't know how many there are?

data = 

         eid: 44000
      dpm_id: [1x1 struct]
     fpga_id: 3.1896e+09
    fpga_ver: 3.1044e+09
     boot_id: 0
     pbs_ver: 'PBS 2012-05-07 16:41'

谢谢！

推荐答案

您正在尝试读取无效的json文件.我建议使用 jsonlint 进行快速验证.

You are trying to read a json file, which is not valid. I recommend to use jsonlint for a quick verification.

您的json看起来像

{
    "skipped":"A"    
}
{
    "skipped":"B"
}

这不是有效的语法，因为它描述了两个对象.在第一个}之后，解析器期望文件结尾，因为json文件包含一个对象.

That is not a valid syntax, because it describes two objects. After the first } the parser expects the end of file because a json file contains one object.

可能的解决方法是:

[
    {
        "skipped": "A"
    },
    {
        "skipped": "B"
    }
]

或

{
    "aa": {
        "skipped": "A"
    },
    "bb": {
        "skipped": "B"
    }
}

这篇关于使用Matlab读取JSON对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！