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October 3, 2023 15:03
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An example of emscripten with WebSocket.
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| // $ em++ -lwebsocket.js -o index.html main.cpp | |
| #include <emscripten/emscripten.h> | |
| #include <emscripten/websocket.h> | |
| #include <stdio.h> | |
| EM_BOOL onopen(int eventType, const EmscriptenWebSocketOpenEvent *websocketEvent, void *userData) { | |
| puts("onopen"); | |
| EMSCRIPTEN_RESULT result; | |
| result = emscripten_websocket_send_utf8_text(websocketEvent->socket, "hoge"); | |
| if (result) { | |
| printf("Failed to emscripten_websocket_send_utf8_text(): %d\n", result); | |
| } | |
| return EM_TRUE; | |
| } | |
| EM_BOOL onerror(int eventType, const EmscriptenWebSocketErrorEvent *websocketEvent, void *userData) { | |
| puts("onerror"); | |
| return EM_TRUE; | |
| } | |
| EM_BOOL onclose(int eventType, const EmscriptenWebSocketCloseEvent *websocketEvent, void *userData) { | |
| puts("onclose"); | |
| return EM_TRUE; | |
| } | |
| EM_BOOL onmessage(int eventType, const EmscriptenWebSocketMessageEvent *websocketEvent, void *userData) { | |
| puts("onmessage"); | |
| if (websocketEvent->isText) { | |
| // For only ascii chars. | |
| printf("message: %s\n", websocketEvent->data); | |
| } | |
| EMSCRIPTEN_RESULT result; | |
| result = emscripten_websocket_close(websocketEvent->socket, 1000, "no reason"); | |
| if (result) { | |
| printf("Failed to emscripten_websocket_close(): %d\n", result); | |
| } | |
| return EM_TRUE; | |
| } | |
| int main() { | |
| if (!emscripten_websocket_is_supported()) { | |
| return 0; | |
| } | |
| EmscriptenWebSocketCreateAttributes ws_attrs = { | |
| "wss://echo.websocket.org", | |
| NULL, | |
| EM_TRUE | |
| }; | |
| EMSCRIPTEN_WEBSOCKET_T ws = emscripten_websocket_new(&ws_attrs); | |
| emscripten_websocket_set_onopen_callback(ws, NULL, onopen); | |
| emscripten_websocket_set_onerror_callback(ws, NULL, onerror); | |
| emscripten_websocket_set_onclose_callback(ws, NULL, onclose); | |
| emscripten_websocket_set_onmessage_callback(ws, NULL, onmessage); | |
| } |
It works fine for me, but I had to use another echo server, I used the one from this page: http://websockets.chilkat.io/
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Doesn't work at all: