以下是一些使用 AE 实现网络编程、多线程编程和异步编程等方面应用的示例。
网络编程：
使用 AE 可以方便地实现网络编程，例如，可以使用 AE 实现一个简单的 TCP 服务器，如下所示：
服务端代码
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "ae.h"
#define PORT 5000
// accept 回调函数，用于接收新连接
void acceptTcpHandler(aeEventLoop *loop, int fd, void *clientdata, int mask) {
// 接收新连接
int clientfd = accept(fd, NULL, NULL);
if (clientfd == -1) {
fprintf(stderr, "accept failed, errno: %d\n", errno);
return;
}
// 为新连接添加读事件
aeCreateFileEvent(loop, clientfd, AE_READABLE, readTcpHandler, NULL);
}
// 读事件回调函数，用于接收客户端发送的数据
void readTcpHandler(aeEventLoop *loop, int fd, void *clientdata, int mask) {
char buffer[1024];
// 读取客户端发送的数据
int nread = read(fd, buffer, sizeof(buffer));
if (nread == -1) {
fprintf(stderr, "read failed, errno: %d\n", errno);
close(fd);
aeDeleteFileEvent(loop, fd, AE_READABLE);
return;
} else if (nread == 0) {
close(fd);
aeDeleteFileEvent(loop, fd, AE_READABLE);
return;
}
buffer[nread] = '\0';
// 打印接收到的数据
printf("read data: %s\n", buffer);
}
int main() {
// 创建 AE 实例
aeEventLoop *loop = aeCreateEventLoop(1024);
if (loop == NULL) {
fprintf(stderr, "create event loop failed\n");
exit(EXIT_FAILURE);
}
// 创建监听套接字
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
fprintf(stderr, "create socket failed, errno: %d\n", errno);
exit(EXIT_FAILURE);
}
// 绑定监听套接字到指定端口
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(PORT);
if (bind(sockfd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
fprintf(stderr, "bind failed, errno: %d\n", errno);
exit(EXIT_FAILURE);
}
// 开始监听
if (listen(sockfd, 1024) == -1) {
fprintf(stderr, "listen failed, errno: %d\n", errno);
exit(EXIT_FAILURE);
}
// 为监听套接字添加读事件
if (aeCreateFileEvent(loop, sockfd, AE_READABLE, acceptTcpHandler, NULL) == -1) {
fprintf(stderr, "create file event failed, errno: %d\n", errno);
exit(EXIT_FAILURE);
}
// 进入事件循环
aeMain(loop);
// 销毁 AE 实例
aeDeleteEventLoop(loop);
return 0;
}
客户端代码
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 5000
int main() {
// 创建套接字
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
fprintf(stderr, "create socket failed, errno: %d\n", errno);
exit(EXIT_FAILURE);
}
// 连接服务器
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(SERVER_IP);
addr.sin_port = htons(SERVER_PORT);
int ret = connect(sockfd, (struct sockaddr*)&addr, sizeof(addr));
if (ret == -1) {
if (errno == EINPROGRESS) {
// 连接正在进行中，需要等待连接完成或者超时
fd_set rset, wset;
FD_ZERO(&rset);
FD_SET(sockfd, &rset);
wset = rset;
struct timeval tv;
tv.tv_sec = 5; // 超时时间 5 秒
tv.tv_usec = 0;
ret = select(sockfd + 1, &rset, &wset, NULL, &tv);
if (ret == -1) {
fprintf(stderr, "select failed, errno: %d\n", errno);
close(sockfd);
exit(EXIT_FAILURE);
} else if (ret == 0) {
fprintf(stderr, "connect timeout\n");
close(sockfd);
exit(EXIT_FAILURE);
} else {
int error = 0;
socklen_t len = sizeof(error);
getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &error, &len);
if (error != 0) {
fprintf(stderr, "connect failed, errno: %d\n", error);
close(sockfd);
exit(EXIT_FAILURE);
}
}
} else {
fprintf(stderr, "connect failed, errno: %d\n", errno);
close(sockfd);
exit(EXIT_FAILURE);
}
}
// 发送数据
const char *data = "hello, world";
int nwrite = write(sockfd, data, strlen(data));
if (nwrite == -1) {
fprintf(stderr, "write failed, errno: %d\n", errno);
close(sockfd);
exit(EXIT_FAILURE);
}
// 接收数据
char buffer[1024];
int nread = read(sockfd, buffer, sizeof(buffer));
if (nread == -1) {
fprintf(stderr, "read failed, errno: %d\n", errno);
close(sockfd);
exit(EXIT_FAILURE);
} else if (nread == 0) {
fprintf(stderr, "server closed connection\n");
close(sockfd);
exit(EXIT_FAILURE);
}
buffer[nread] = '\0';
// 打印接收到的数据
printf("received data: %s\n", buffer);
// 关闭套接字
close(sockfd);
return 0;
}
