接收数据并处理成json包的C++程序
时间: 2023-05-15 09:07:25 浏览: 57
可以使用C语言中的json-c库来处理数据并生成json包。以下是一个简单的示例代码:
#include <stdio.h>
#include <stdlib.h>
#include <json-c/json.h>
int main() {
char* data = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";
struct json_object* obj = json_tokener_parse(data);
printf("Name: %s\n", json_object_get_string(json_object_object_get(obj, "name")));
printf("Age: %d\n", json_object_get_int(json_object_object_get(obj, "age")));
printf("City: %s\n", json_object_get_string(json_object_object_get(obj, "city")));
json_object_put(obj);
return 0;
}
这个程序接收一个包含json数据的字符串,使用json_tokener_parse函数将其解析为一个json对象,然后可以使用json_object_object_get函数获取对象中的属性值。最后,使用json_object_put函数释放对象的内存。
相关问题
C++实现TCp传输json数据源码示
以下是一个简单的示例程序,演示如何使用C++实现TCP传输JSON数据:
```cpp
#include <iostream>
#include <cstring>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <unistd.h>
#include <json/json.h>
int main() {
// 创建socket
int sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sockfd < 0) {
std::cerr << "Error creating socket." << std::endl;
return -1;
}
// 设置服务器地址和端口
struct sockaddr_in serv_addr;
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
serv_addr.sin_port = htons(12345);
// 连接服务器
if (connect(sockfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) {
std::cerr << "Error connecting to server." << std::endl;
return -1;
}
// 构造JSON对象
Json::Value root;
root["name"] = "John";
root["age"] = 30;
root["city"] = "New York";
// 序列化JSON对象为字符串
std::string json_str = root.toStyledString();
// 发送JSON字符串
if (send(sockfd, json_str.c_str(), json_str.length(), 0) < 0) {
std::cerr << "Error sending data." << std::endl;
return -1;
}
// 关闭socket
close(sockfd);
return 0;
}
```
在此示例中,我们使用了第三方库JsonCpp来构造和序列化JSON对象。使用send函数将JSON字符串发送到服务器端口12345。请注意,此示例仅演示了如何发送数据,服务器端应该有相应的代码来接收数据并进行处理。
c++实现一个能够接收HTTP请求并处理邮件数据的代理服务器
要实现一个能够接收HTTP请求并处理邮件数据的代理服务器,需要以下步骤:
1. 创建一个C++程序,包含HTTP服务器和邮件客户端的代码。
2. 通过HTTP服务器接收HTTP请求,解析请求头和请求体,获取需要处理的邮件数据。
3. 使用邮件客户端连接邮件服务器,将需要处理的邮件数据发送给邮件服务器。
4. 等待邮件服务器的响应,将响应数据返回给HTTP客户端。
以下是一个简单的示例程序,使用Boost库实现HTTP服务器和邮件客户端:
```c++
#include <iostream>
#include <string>
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
#include <boost/bind.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/property_tree/ptree.hpp>
#include <openssl/ssl.h>
#include <openssl/err.h>
using namespace boost::asio;
using namespace boost::asio::ip;
using namespace boost::property_tree;
class proxy_server {
public:
proxy_server(io_service& io_service, int port, const std::string& mail_server, int mail_port)
: io_service_(io_service), acceptor_(io_service, tcp::endpoint(tcp::v4(), port)), mail_server_(mail_server), mail_port_(mail_port) {
start_accept();
}
private:
void start_accept() {
socket_ptr sock(new tcp::socket(io_service_));
acceptor_.async_accept(*sock, boost::bind(&proxy_server::handle_accept, this, sock, boost::asio::placeholders::error));
}
void handle_accept(socket_ptr sock, const boost::system::error_code& error) {
if (!error) {
boost::asio::async_read_until(*sock, request_, "\r\n\r\n", boost::bind(&proxy_server::handle_read, this, sock, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}
start_accept();
}
void handle_read(socket_ptr sock, const boost::system::error_code& error, size_t bytes_transferred) {
if (!error) {
std::istream stream(&request_);
std::string line;
getline(stream, line);
std::vector<std::string> parts;
boost::split(parts, line, boost::is_any_of(" "));
if (parts.size() == 3) {
std::string method = parts[0];
std::string path = parts[1];
std::string version = parts[2];
ptree headers;
std::string header_line;
while (getline(stream, header_line) && header_line != "\r") {
std::vector<std::string> header_parts;
boost::split(header_parts, header_line, boost::is_any_of(":"));
if (header_parts.size() == 2) {
std::string header_name = header_parts[0];
std::string header_value = header_parts[1];
headers.add(header_name, header_value);
}
}
std::string content;
if (headers.get_optional<std::string>("Content-Length")) {
size_t content_length = boost::lexical_cast<size_t>(headers.get<std::string>("Content-Length"));
boost::asio::read(*sock, request_, boost::asio::transfer_exactly(content_length - bytes_transferred));
std::istream content_stream(&request_);
getline(content_stream, content);
}
std::string mail_data = parse_mail_data(content);
std::string mail_server = mail_server_ + ":" + boost::lexical_cast<std::string>(mail_port_);
boost::asio::io_service mail_io_service;
tcp::resolver mail_resolver(mail_io_service);
tcp::resolver::query mail_query(mail_server, "smtp");
tcp::socket mail_socket(mail_io_service);
boost::asio::connect(mail_socket, mail_resolver.resolve(mail_query));
boost::asio::write(mail_socket, boost::asio::buffer("DATA\r\n"));
boost::asio::read_until(mail_socket, reply_, "\r\n");
boost::asio::write(mail_socket, boost::asio::buffer(mail_data + "\r\n.\r\n"));
boost::asio::read_until(mail_socket, reply_, "\r\n");
std::string response = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nContent-Length: 18\r\n\r\nMail sent to " + mail_server_;
boost::asio::write(*sock, boost::asio::buffer(response));
}
}
}
std::string parse_mail_data(const std::string& content) {
ptree json;
std::istringstream is(content);
read_json(is, json);
std::stringstream ss;
ss << "From: " << json.get<std::string>("from") << "\r\n";
ss << "To: " << json.get<std::string>("to") << "\r\n";
ss << "Subject: " << json.get<std::string>("subject") << "\r\n";
ss << "\r\n";
ss << json.get<std::string>("body");
return ss.str();
}
private:
io_service& io_service_;
tcp::acceptor acceptor_;
boost::asio::streambuf request_;
boost::asio::streambuf reply_;
std::string mail_server_;
int mail_port_;
};
int main(int argc, char** argv) {
SSL_load_error_strings();
SSL_library_init();
if (argc != 4) {
std::cerr << "Usage: " << argv[0] << " <port> <mail_server> <mail_port>" << std::endl;
return 1;
}
try {
io_service io_service;
proxy_server server(io_service, atoi(argv[1]), argv[2], atoi(argv[3]));
io_service.run();
}
catch (std::exception& e) {
std::cerr << e.what() << std::endl;
}
return 0;
}
```
以上只是一个简单的示例程序,实际应用中还需要进行更多的错误处理和安全性保护。