[Linux C] libwebsocket 隨手筆記

此篇稍為記錄一下在C上面時做websocket時遇到的問題...


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(a)  callback function

return 0;

之前不小心return ;造成websocket的connection都無法建立


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(b)libwebsocket_write

想要將資料寫出去必須使用libwebsocket_write的函式回傳

下面來個簡單的範例！

char *text = "Hello World!";
   int len = strlen (text) + 1;
   unsigned char *buf = malloc(LWS_SEND_BUFFER_PRE_PADDING + len + LWS_SEND_BUFFER_POST_PADDING);
   /* copy string including terminating NUL */
   memcpy (buf + LWS_SEND_BUFFER_PRE_PADDING, text, len );
   libwebsocket_write(wsi, buf + LWS_SEND_BUFFER_PRE_PADDING, len, LWS_WRITE_TEXT);
   free(buf);