{"id":174745,"date":"2024-11-07T23:24:37","date_gmt":"2024-11-07T15:24:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/174745\/"},"modified":"2024-11-07T23:24:38","modified_gmt":"2024-11-07T15:24:38","slug":"%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8c%e8%aa%9e%e8%a8%80%e7%8d%b2%e5%8f%96%e7%b6%b2%e9%a0%81on%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9f-c-%e7%8d%b2%e5%8f%96%e7%b6%b2%e9%a0%81json%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/174745\/","title":{"rendered":"\u5982\u4f55\u5229\u7528C\u8a9e\u8a00\u7372\u53d6\u7db2\u9801ON\u6578\u64da\u5eab\uff1f (c \u7372\u53d6\u7db2\u9801json\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8c%e8%aa%9e%e8%a8%80%e7%8d%b2%e5%8f%96%e7%b6%b2%e9%a0%81json%e6%95%b8%e6%93%9a%e5%ba%ab-WbDRkbxnYe\">\u5982\u4f55\u5229\u7528C\u8a9e\u8a00\u7372\u53d6\u7db2\u9801JSON\u6578\u64da\u5eab<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0c\u5f9e\u7db2\u9801\u7372\u53d6\u6578\u64da\u5df2\u6210\u70ba\u8a31\u591a\u61c9\u7528\u7a0b\u5e8f\u548c\u670d\u52d9\u7684\u6838\u5fc3\u529f\u80fd\u3002C\u8a9e\u8a00\u4f5c\u70ba\u4e00\u7a2e\u9ad8\u6548\u7684\u7de8\u7a0b\u8a9e\u8a00\uff0c\u96d6\u7136\u4e0d\u5982Python\u7b49\u8a9e\u8a00\u5728\u7db2\u7d61\u7de8\u7a0b\u4e2d\u6d41\u884c\uff0c\u4f46\u5b83\u4ecd\u7136\u53ef\u4ee5\u7528\u4f86\u7372\u53d6\u7db2\u9801\u4e0a\u7684JSON\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528C\u8a9e\u8a00\u4f86\u7372\u53d6\u7db2\u9801\u4e0a\u7684JSON\u6578\u64da\u5eab\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u4ee3\u78bc\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afjson%ef%bc%9f-WbDRkbxnYe\">\u4ec0\u9ebc\u662fJSON\uff1f<\/h2>\n<p>JSON\uff08JavaScript Object Notation\uff09\u662f\u4e00\u7a2e\u8f15\u91cf\u7d1a\u7684\u6578\u64da\u4ea4\u63db\u683c\u5f0f\uff0c\u6613\u65bc\u4eba\u985e\u95b1\u8b80\u548c\u7de8\u5beb\uff0c\u540c\u6642\u4e5f\u6613\u65bc\u6a5f\u5668\u89e3\u6790\u548c\u751f\u6210\u3002\u5b83\u901a\u5e38\u7528\u65bc\u7db2\u7d61\u61c9\u7528\u7a0b\u5e8f\u4e2d\uff0c\u4f5c\u70ba\u5ba2\u6236\u7aef\u548c\u670d\u52d9\u5668\u4e4b\u9593\u7684\u6578\u64da\u50b3\u8f38\u683c\u5f0f\u3002JSON\u7684\u7d50\u69cb\u985e\u4f3c\u65bcJavaScript\u5c0d\u8c61\uff0c\u4f7f\u7528\u9375\u503c\u5c0d\u4f86\u8868\u793a\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%8d%b2%e5%8f%96%e7%b6%b2%e9%a0%81%e6%95%b8%e6%93%9a%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%ad%a5%e9%a9%9f-WbDRkbxnYe\">\u7372\u53d6\u7db2\u9801\u6578\u64da\u7684\u57fa\u672c\u6b65\u9a5f<\/h2>\n<p>\u8981\u4f7f\u7528C\u8a9e\u8a00\u7372\u53d6\u7db2\u9801\u4e0a\u7684JSON\u6578\u64da\uff0c\u901a\u5e38\u9700\u8981\u9075\u5faa\u4ee5\u4e0b\u6b65\u9a5f\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528HTTP\u8acb\u6c42\u7372\u53d6\u7db2\u9801\u5167\u5bb9\u3002<\/li>\n<li>\u89e3\u6790\u7372\u53d6\u7684\u6578\u64da\uff0c\u63d0\u53d6JSON\u90e8\u5206\u3002<\/li>\n<li>\u5c07JSON\u6578\u64da\u8f49\u63db\u70ba\u53ef\u7528\u7684\u6578\u64da\u7d50\u69cb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8c%e8%aa%9e%e8%a8%80%e9%80%b2%e8%a1%8chttp%e8%ab%8b%e6%b1%82-WbDRkbxnYe\">\u4f7f\u7528C\u8a9e\u8a00\u9032\u884cHTTP\u8acb\u6c42<\/h2>\n<p>\u5728C\u8a9e\u8a00\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u5eab\u4f86\u9032\u884cHTTP\u8acb\u6c42\uff0c\u5176\u4e2d\u6700\u5e38\u7528\u7684\u662flibcurl\u3002libcurl\u662f\u4e00\u500b\u5f37\u5927\u7684\u5eab\uff0c\u652f\u6301\u591a\u7a2e\u5354\u8b70\uff0c\u5305\u62ecHTTP\u3001HTTPS\u7b49\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528libcurl\u9032\u884cHTTP GET\u8acb\u6c42\u7684\u57fa\u672c\u793a\u4f8b\uff1a<\/p>\n<pre><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n#include &lt;string.h&gt;\n#include &lt;curl\/curl.h&gt;\n\nsize_t WriteCallback(void *contents, size_t size, size_t nmemb, void *userp) {\n    ((struct String *)userp)-&gt;ptr = realloc(((struct String *)userp)-&gt;ptr, \n        ((struct String *)userp)-&gt;len + size * nmemb + 1);\n    if (((struct String *)userp)-&gt;ptr == NULL) {\n        printf(\"not enough memory (realloc returned NULL)n\");\n        return 0;\n    }\n    memcpy(&amp;(((struct String *)userp)-&gt;ptr[((struct String *)userp)-&gt;len]), contents, size * nmemb);\n    ((struct String *)userp)-&gt;len += size * nmemb;\n    ((struct String *)userp)-&gt;ptr[((struct String *)userp)-&gt;len] = '';\n    return size * nmemb;\n}\n\nint main(void) {\n    CURL *curl;\n    CURLcode res;\n    struct String {\n        char *ptr;\n        size_t len;\n    };\n    struct String s;\n    s.len = 0;\n    s.ptr = malloc(s.len + 1);\n    s.ptr[0] = '';\n\n    curl_global_init(CURL_GLOBAL_DEFAULT);\n    curl = curl_easy_init();\n    if(curl) {\n        curl_easy_setopt(curl, CURLOPT_URL, \"http:\/\/example.com\/data.json\");\n        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);\n        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&amp;s);\n        res = curl_easy_perform(curl);\n        curl_easy_cleanup(curl);\n    }\n    curl_global_cleanup();\n\n    printf(\"%sn\", s.ptr);\n    free(s.ptr);\n    return 0;\n}\n<\/code><\/pre>\n<h2 id=\"%e8%a7%a3%e6%9e%90json%e6%95%b8%e6%93%9a-WbDRkbxnYe\">\u89e3\u6790JSON\u6578\u64da<\/h2>\n<p>\u7372\u53d6\u5230JSON\u6578\u64da\u5f8c\uff0c\u63a5\u4e0b\u4f86\u9700\u8981\u89e3\u6790\u9019\u4e9b\u6578\u64da\u3002C\u8a9e\u8a00\u4e2d\u6709\u591a\u500b\u5eab\u53ef\u4ee5\u7528\u4f86\u89e3\u6790JSON\uff0c\u4f8b\u5982cJSON\u548cjson-c\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528cJSON\u89e3\u6790JSON\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>#include &lt;cjson\/cJSON.h&gt;\n\n\/\/ \u5047\u8a2ds.ptr\u5305\u542b\u4e86\u7372\u53d6\u7684JSON\u6578\u64da\ncJSON *json = cJSON_Parse(s.ptr);\nif (json == NULL) {\n    printf(\"Error parsing JSONn\");\n    return 1;\n}\n\n\/\/ \u7372\u53d6\u67d0\u500b\u5b57\u6bb5\u7684\u503c\ncJSON *field = cJSON_GetObjectItem(json, \"field_name\");\nif (cJSON_IsString(field) &amp;&amp; (field-&gt;valuestring != NULL)) {\n    printf(\"Field value: %sn\", field-&gt;valuestring);\n}\n\ncJSON_Delete(json);\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-WbDRkbxnYe\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u4ee5\u4e0a\u6b65\u9a5f\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528C\u8a9e\u8a00\u6210\u529f\u7372\u53d6\u4e26\u89e3\u6790\u7db2\u9801\u4e0a\u7684JSON\u6578\u64da\u3002\u96d6\u7136C\u8a9e\u8a00\u5728\u7db2\u7d61\u7de8\u7a0b\u4e2d\u7684\u61c9\u7528\u4e0d\u5982\u5176\u4ed6\u9ad8\u7d1a\u8a9e\u8a00\u666e\u904d\uff0c\u4f46\u5176\u9ad8\u6548\u6027\u548c\u9748\u6d3b\u6027\u4f7f\u5176\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u4ecd\u7136\u662f\u4e00\u500b\u4e0d\u932f\u7684\u9078\u64c7\u3002\u5982\u679c\u60a8\u9700\u8981\u7a69\u5b9a\u7684\u670d\u52d9\u5668\u4f86\u904b\u884c\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0c\u4ee5\u78ba\u4fdd\u60a8\u7684\u6578\u64da\u7372\u53d6\u904e\u7a0b\u9806\u5229\u9032\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528C\u8a9e\u8a00\u7372\u53d6\u7db2\u9801\u4e0a\u7684JSON\u6578\u64da\uff0c\u5be6\u73fe\u6578\u64da\u5eab\u7684\u9ad8\u6548\u8a2a\u554f\u8207\u8655\u7406\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-174745","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174745","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=174745"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174745\/revisions"}],"predecessor-version":[{"id":174746,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174745\/revisions\/174746"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=174745"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=174745"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=174745"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}