Question

我使用curl发送JSON格式的JSON字符串来发布JSON数据。

我使用了以下curl命令：

curl -H "Content-Type: application/json" -d '{ "Mode":"Auto","Type":"Single","IP":"9.9.9.9","FirmwarePath":""}' http://1.1.1.1/cgi-bin/update_firmware.cgi

输出上述命令：

<h1>{ "Mode":"Auto","Type":"Single","IP":"9.9.9.9","FirmwarePath":""} </h1><h1>Check Mode</h1><h1>Auto</h1><h1>Single</h1><h1 /><h1>Here Mode</h1><h1>{ "Mode":"Auto","Type":"Single","IP":"9.9.9.9","FirmwarePath":""}</h1><h1>Check Input</h1><h1>Inside Firmware updates</h1><h1>In CheckFirmware</h1><h1>curl -s --digest --basic -u root:UOIYTm7Aw52Z "http://9.9.9.9/axis-cgi/operator/param.cgi?action=list&group=Properties.Firmware.Version" | cut -d'=' -f2</h1><h1>cam Firm:5.50.4.2
</h1><h1>DB Firm: </h1>Status: 200
Content-Type: application/json; charset=ISO-8859-1

{"ReqStatus":{"Status":"Firmware is upto date or Firmaware update mode is off.","IP":null}}

所以，它运作良好＆amp;给了我一个预期的输出。

现在我想将此输出存储在文本文件中。所以，我已经制定了C程序来实现这个目标：

#include <stdio.h>
#include <curl/curl.h>

size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream) {
    size_t written = fwrite(ptr, size, nmemb, stream);
    return written;
}

int main(void) {
    CURL *curl;

    FILE *fp = fopen("request.txt","w");
    CURLcode res;

    curl = curl_easy_init();

    char* jsonObj = "{\"Mode\":\"Auto\",\"type\":\"Single\",\"IP\":\"9.9.9.9\",\"FirmwarePath\":\"""\"}";
    puts(jsonObj);
    struct curl_slist *headers = NULL;
    curl_slist_append(headers, "Accept: application/json");
    curl_slist_append(headers, "Content-Type: application/json");
    curl_slist_append(headers, "charsets: utf-8");

    curl_easy_setopt(curl, CURLOPT_URL, "http://1.1.1.1/cgi-bin/update_firmware.cgi");

    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT");
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, jsonObj);
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,write_data);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA,fp);

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);
    return res;
}

但是当我打开request.txt文件执行这个C程序后，我看到了意外的输出。

request.txt文件的内容：

<h1>Software error:</h1>

malformed JSON string, neither array, object, number, string or atom, at character offset 0 (before "(end of string)") at /var/www/cgi-bin/update_firmware.cgi line 496

<p>
For help, please send mail to the webmaster (<a href="mailto:root@localhost">root@localhost</a>), giving this error message 
and the time and date of the error.

</p>

我想发送的JSON数据是：

{  
   "Mode":"Auto",
   "Type":"Single",
   "IP":"9.9.9.9",
   "FirmwarePath":"" 
}

我在这里做错了什么？

Answer 1

[min]="data.startDate"

删除该选项。您的命令行没有设置任何自定义方法，但使用POST（由curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT");隐含）。

jsonObj字符串末尾的引号之间存在一些混淆，应该是：

-d

C中格式错误的JSON字符串错误

1 个答案: