C編寫的輕量級json庫：parson

parson是一個采用C編寫的輕量級JOSN庫。

特性

• Full JSON support
• Lightweight (only 2 files)
• Simple API
• Addressing json values with dot notation (similiar to C structs or objects in most OO languages, e.g. "objectA.objectB.value")
• C89 compatible
• Test suites
</ul>

解析JSON

Here is a function, which prints basic commit info (date, sha and author) from a github repository.

void print_commits_info(const char *username, const char *repo) {
    JSON_Value *root_value;
    JSON_Array *commits;
    JSON_Object *commit;
    size_t i;

    char curl_command[512];
    char cleanup_command[256];
    char output_filename[] = "commits.json";

    /* it ain't pretty, but it's not a libcurl tutorial */
    sprintf(curl_command, 
        "curl -s \"https://api.github.com/repos/%s/%s/commits\" > %s",
        username, repo, output_filename);
    sprintf(cleanup_command, "rm -f %s", output_filename);
    system(curl_command);

    /* parsing json and validating output */
    root_value = json_parse_file(output_filename);
    if (json_value_get_type(root_value) != JSONArray) {
        system(cleanup_command);
        return;
    }

    /* getting array from root value and printing commit info */
    commits = json_value_get_array(root_value);
    printf("%-10.10s %-10.10s %s\n", "Date", "SHA", "Author");
    for (i = 0; i < json_array_get_count(commits); i++) {
        commit = json_array_get_object(commits, i);
        printf("%.10s %.10s %s\n",
               json_object_dotget_string(commit, "commit.author.date"),
               json_object_get_string(commit, "sha"),
               json_object_dotget_string(commit, "commit.author.name"));
    }

    /* cleanup code */
    json_value_free(root_value);
    system(cleanup_command);
}

Calling print_commits_info("torvalds", "linux"); prints:

Date       SHA        Author
2012-10-15 dd8e8c4a2c David Rientjes
2012-10-15 3ce9e53e78 Michal Marek
2012-10-14 29bb4cc5e0 Randy Dunlap
2012-10-15 325adeb55e Ralf Baechle
2012-10-14 68687c842c Russell King
2012-10-14 ddffeb8c4d Linus Torvalds

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