【C++】获取url参数

一时失言乱红尘 2024-04-01 10:27 55阅读 0赞

### 获取url参数 ###

#### 代码示例 ####

可自行改造

/**
     * C++ 获取url参数, a=1&b=2&c=3
     *
     * @param url_args
     * @param url_params
     * @return
     */
    int get_url_args(map<string, string> &url_args, string &url_params) {
        
        if (url_params.empty()) {
        
            return -1;
        }
    
        string key;
        string val;
    
        size_t last_pos = 0;
        size_t amp_pos = 0;  /* & == amp;*/
        size_t equal_pos = 0;
    
        while ((equal_pos = url_params.find('=', last_pos)) != string::npos) {
        
            amp_pos = url_params.find('&', last_pos);
            if (amp_pos == string::npos) {
        
                amp_pos = url_params.length();
            }
    
            key = url_params.substr(last_pos, equal_pos - last_pos);
            val = url_params.substr(equal_pos + 1, amp_pos - (equal_pos + 1));
    
            url_args[key] = val;
    
            last_pos = amp_pos + 1;
    
            if (last_pos >= url_params.length()) {
        
                break;
            }
        }
        return 0;
    }

#### 测试 ####

int main() {
        
        map<string, string> url_args;
        string url_params = "cdncode=18907E7BE0798990%2F&index=2&xxxxx=18840&yyyyy=30000&brs=760272&bre=1190603&ver=4&stdfrom=5000";
        get_url_args(url_args, url_params);
        //map<string, string>::iterator it = url_args.begin();
        auto it = url_args.begin();
        for (; it != url_args.end(); it++) {
        
            cout << it->first << "=" << it->second << endl;
        }
    
        return 0;
    }

#### 运行结果 ####

bre=1190603
    brs=760272
    cdncode=18907E7BE0798990%2F
    index=2
    stdfrom=5000
    ver=4
    xxxxx=18840
    yyyyy=30000

### 获取域名 ###

/**
     * C++ 获取域名
     *
     * @param url
     * @param domain
     * @param is_http
     * @return
     */
    int get_domain(const string &url, string &domain, bool is_http) {
        
        if (url.empty()) {
        
            return -1;
        }
    
        domain = "";
    
        const string http = "http://";
        const string https = "https://";
    
        if (url.find(http) != string::npos || url.find(https) != string::npos) {
        
            string::size_type start_pos = is_http ? http.length() : https.length();
            string::size_type end_pos = url.find("/", start_pos);
            if (end_pos != string::npos) {
        
                domain = url.substr(start_pos, end_pos - start_pos);
            } else {
        
                domain = url.substr(start_pos);
            }
    
        }
    
        return 0;
    
    }

#### 测试 ####

int main() {
        
        string http_domain;
        get_domain("http://aaa.bbb.com/1.mp4", http_domain, true);
        cout << http_domain << endl;
    
        string https_domain;
        get_domain("https://111.222.333", https_domain, false);
        cout << https_domain << endl;
        return 0;
    }

#### 运行结果 ####

aaa.bbb.com
    111.222.333