C语言libyaml基于文档的解析示例。

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C语言libyaml基于文档的解析示例。

#C语言libyaml基于文档的解析示例。| 来源: 网络整理| 查看: 265

libyaml安装说明，请参照

https://github.com/yaml/libyaml

不过官网的示例，真是不太好找实现的样例，找了大半天，都不知道示例在搞啥，也许我不太深刻吧，果然国外人的思维和中国人不一样。

其次就是解决一个非常简单的事情，读这个配置，把参数取出来就可以了，其余的不要折腾。

直接上代码了。

先搞个db.yaml的文件样子

db_server: "localhost" db_password: "test" db_username: "abc" national_rail_username: test national_rail_password: wibble languages: - Ruby - Perl - Python websites: YAML: yaml.org Ruby: ruby-lang.org Python: python.org Perl: use.perl.org

main.c

#include #include typedef struct Conf { char* db_server; char* db_pass; char* db_user; char* rail_user; char* rail_pass; } Conf; Conf* readConf(char* filename) { FILE* fh = fopen(filename, "r"); yaml_parser_t parser; yaml_token_t token; Conf* conf = malloc(sizeof(Conf)); if (!yaml_parser_initialize(&parser)) fputs("Failed to initialize parser!\n", stderr); if (fh == NULL) fputs("Failed to open file!\n", stderr); yaml_parser_set_input_file(&parser, fh); do { /* As this is an example, I'll just use: * state = 0 = expect key * state = 1 = expect value */ int state = 0; char** datap; char* tk; yaml_parser_scan(&parser, &token); switch(token.type) { case YAML_KEY_TOKEN: state = 0; break; case YAML_VALUE_TOKEN: state = 1; break; case YAML_SCALAR_TOKEN: tk = token.data.scalar.value; if (state == 0) { /* It's safe to not use strncmp as one string is a literal */ if (!strcmp(tk, "db_server")) { datap = &conf->db_server; } else if (!strcmp(tk, "db_password")) { datap = &conf->db_pass; } else if (!strcmp(tk, "db_username")) { datap = &conf->db_user; } else if (!strcmp(tk, "national_rail_username")) { datap = &conf->rail_user; } else if (!strcmp(tk, "national_rail_password")) { datap = &conf->rail_pass; } else { printf("key: %s\n", tk); } } else { *datap = strdup(tk); } break; default: break; } if (token.type != YAML_STREAM_END_TOKEN) yaml_token_delete(&token); } while (token.type != YAML_STREAM_END_TOKEN); yaml_token_delete(&token); yaml_parser_delete(&parser); fclose(fh); return conf; } int main(){ char *filename = "db.yaml"; struct Conf *conf = readConf(filename); printf("%s,%s\n",conf->db_server,conf->db_user); return 0; }

ok，就这样取出来就可以了。

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C语言libyaml基于文档的解析示例。

C语言libyaml基于文档的解析示例。

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