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我正在通過C websocket庫libwebsockets客戶端示例。C websocket庫,libwebsockets
但我不明白示例的目的是什麼。
Here就是這個例子,這個例子有兩個連接(代碼爲wsi_dumb
和wsi_mirror
),這兩個連接都是我認爲的,我不知道第二個連接的目的是什麼。
使用第一個連接(在代碼wsi_dumb
),它似乎等待來自服務器的請求與libwebsocket_service()
然後...什麼與第二個連接(在代碼wsi_mirror
)?
下面是我說的代碼的一部分。
wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
"/", argv[optind], argv[optind],
protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
/*
* sit there servicing the websocket context to handle incoming
* packets, and drawing random circles on the mirror protocol websocket
*/
n = 0;
while (n >= 0 && !was_closed) {
n = libwebsocket_service(context, 1000);
if (wsi_mirror == NULL) {
/* create a client websocket using mirror protocol */
wsi_mirror = libwebsocket_client_connect(context, address, port,
use_ssl, "/", argv[optind], argv[optind],
protocols[PROTOCOL_LWS_MIRROR].name, ietf_version);
mirror_lifetime = 10 + (random() & 1023);
fprintf(stderr, "opened mirror connection with %d lifetime\n", mirror_lifetime);
} else {
mirror_lifetime--;
if (mirror_lifetime == 0) {
fprintf(stderr, "closing mirror session\n");
libwebsocket_close_and_free_session(context,
wsi_mirror, LWS_CLOSE_STATUS_GOINGAWAY);
/*
* wsi_mirror will get set to NULL in
* callback when close completes
*/
}
}
}