- #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include <pthread.h>
#include <libwebsockets.h>
//协议回调函数之 callback_http
static int callback_http(struct lws *wsi,
enum lws_callback_reasons reason, void *user,
void *in, size_t len)
{
return 0;
}
static int websocket_write_back(struct lws *wsi_in, char *str, int str_size_in) //此函数从别处借来,再此非常感谢
{
if (str == NULL || wsi_in == NULL)
return -1;
int n;
int len;
unsigned char *out = NULL;
if (str_size_in < 1)
len = strlen(str);
else
len = str_size_in;
out = (unsigned char *)malloc(sizeof(unsigned char)*(LWS_SEND_BUFFER_PRE_PADDING + len + LWS_SEND_BUFFER_POST_PADDING));
//* setup the buffer*/
memcpy (out + LWS_SEND_BUFFER_PRE_PADDING, str, len ); //要发送的数据从此处拷贝
//* write out*/
n = lws_write(wsi_in, out + LWS_SEND_BUFFER_PRE_PADDING, len, LWS_WRITE_TEXT); //lws的发送函数
// printf("[websocket_write_back] %s\n", str);
//* free the buffer*/
free(out);
return n;
}
//callback_dumb_increment
static int callback_dumb_increment(struct lws *wsi,
enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
int temp = 0;
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
printf("connection established\n");
break;
case LWS_CALLBACK_RECEIVE: {
printf("received data: %s\n", (char *) in);
lws_close_reason(wsi, LWS_CLOSE_STATUS_GOINGAWAY,
(unsigned char *)"seeya", 5);
}
break;
case LWS_CALLBACK_SERVER_WRITEABLE://此处会调用的前提是:lws_callback_on_writable_all_protocol(context,&protocols[1]);被循环调用,如本程序的最后面
printf("writeable+45\n");
websocket_write_back(wsi ,"shfjksahfhie",12);
sleep(1);
break;
default:
break;
}
return 0;
}
//注册协议,一种协议,对应一套处理方案(类似驱动中的设备树)
static struct lws_protocols protocols[] = {
/* first protocol must always be HTTP handler */
{
"http-only", /* name */
callback_http,/* callback */
// sizeof (struct per_session_data__http),/* per_session_data_size */
0, /* max frame size / rx buffer */
},
{
"dumb-increment-protocol",
callback_dumb_increment,
// sizeof(struct per_session_data__dumb_increment), (一帧数据包的大小,注释表示无限制,由实际发送的数据的大小来决定)
10,
/* rx buf size must be >= permessage-deflate rx size
* dumb-increment only sends very small packets, so we set
* this accordingly. If your protocol will send bigger
* things, adjust this to match */
},
{ NULL, NULL, 0, 0 } /* terminator */
};
int main(void)
{
int port = 9988;//端口号
struct lws_context_creation_info info;//上下文对象的信息
struct lws_context *context;//上下文对象指针
int opts = 0;//本软件的额外功能选项
volatile int force_exit = 0;
unsigned int ms, oldms = 0;
int n = 0;
//设置info,填充info信息体
memset(&info,0,sizeof(info));
info.port = port;
info.iface=NULL;
info.protocols = protocols;
info.extensions = NULL;
info.ssl_cert_filepath = NULL;
info.ssl_private_key_filepath = NULL;
info.ssl_ca_filepath = NULL;
info.gid = -1;
info.uid = -1;
info.options = opts;
info.ka_time = 0;
info.ka_probes = 0;
info.ka_interval = 0;
context = lws_create_context(&info);//创建上下文对面,管理ws
if (context == NULL) {
printf(" Websocket context create error.\n");
return -1;
}
printf("starting server with thread: %d...\n", lws_get_count_threads(context));
while(1)
{
// struct timeval tv;
// gettimeofday(&tv, NULL);
/*
* This provokes the LWS_CALLBACK_SERVER_WRITEABLE for every
* live websocket connection using the DUMB_INCREMENT protocol,
* as soon as it can take more packets (usually immediately)
*/
// ms = (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
// if ((ms - oldms) > 50) {
// lws_callback_on_writable_all_protocol(context,
// &protocols[1]);
// oldms = ms;
// }
lws_callback_on_writable_all_protocol(context,&protocols[1]);//激活 case LWS_CALLBACK_SERVER_WRITEABLE 分支,没有此句,则不能往外发送数据,只有写了此句,才能往客户端发送数据。
lws_service(context, 50);//启动ws服务
}
usleep(10);
lws_context_destroy(context);
return 0;
}
libwebsockets之简单服务器代码
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转载自blog.csdn.net/qq_39101111/article/details/79025438
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