我读过WebSockets适用于iOS 4.2及更高版本。我可以验证确实存在WebSocket对象。但我找不到一个可在手机上运行的WebSocket示例。
例如http://yaws.hyber.org/websockets_example.yaws会使Mobile Safari应用程序崩溃。有没有人让WebSockets在手机上成功运作?
答案 0 :(得分:11)
我可能已经找到了解决方案。当您通过wifi设置代理时,Mobile Safari仅与websockets崩溃。
答案 1 :(得分:6)
支持,但请记住iOS Safari浏览器实现的标准,它不是RFC 6455,而是HyBi-00 / Hixie-76。
您也可以使用此浏览器进行测试:http://websocketstest.com/
同时查看这篇包含大部分版本信息的帖子:https://stackoverflow.com/a/2700609/1312722
OBS!,这是一个老答案。 我已经查看了这篇文章中提到的与browserstack.com结合的网页:
全部使用RFC 6455
答案 2 :(得分:3)
我有类似的问题,甚至看过这篇文章找到它的修复程序。对我而言,它与无线连接无关。它似乎是websockets的iOS实现中的一个错误(甚至是当前版本5.1)。打开一堆XCode的调试,我发现它与内存管理有关,因为我会得到一些“发送到解除分配的实例的消息”。很可能有一个对象没有正确的引用计数,并且过早地清理过。
此博客有很多关于问题症状及其调试方法的重要信息,但没有解决方法:http://dalelane.co.uk/blog/?p=1652
最终,我发现了这种解决方法,我的应用程序几乎完全停止了崩溃。
me = this // strange javascript convention
this.socket = new WebSocket(url);
// put onmessage function in setTimeout to get around ios websocket crash
this.socket.onmessage = function(evt) { setTimeout(function() {me.onMessageHandler(evt);}, 0); };
答案 3 :(得分:2)
我让他们使用Chrome和Safari,iPhone和iPad(以及其他移动设备,但我猜你不介意它们)。这是我正在使用的Javascript代码:
<script language="javascript" type="text/javascript">
var wsUri = document.URL.replace("http", "ws");
var output;
var websocket;
function init()
{
output = document.getElementById("output");
wsConnect();
}
function wsConnect()
{
console.log("Trying connection to " + wsUri);
try
{
output = document.getElementById("output");
websocket = new WebSocket(wsUri);
websocket.onopen = function(evt)
{
onOpen(evt)
};
websocket.onclose = function(evt)
{
onClose(evt)
};
websocket.onmessage = function(evt)
{
onMessage(evt)
};
websocket.onerror = function(evt)
{
onError(evt)
};
}
catch (e)
{
console.log("Exception " + e.toString());
}
}
function onOpen(evt)
{
alert("Connected to " + wsUri);
}
function onClose(evt)
{
alert("Disconnected");
}
function onMessage(evt)
{
alert('Received message : ' + evt.data);
}
function onError(evt)
{
alert("Error : " + evt.toString());
}
function doSend(message)
{
websocket.send(message);
}
window.addEventListener("load", init, false);
调用doSend()函数完成从客户端到服务器的数据发送。从服务器接收数据也有效,我已经从自定义C ++服务器进行了测试。
答案 4 :(得分:1)
这是一个工作样本
<!DOCTYPE html>
<meta charset="utf-8" />
<head>
<title>WebSocket Test</title>
<script language="javascript" type="text/javascript">
var websocket;
function OpenWebSocket()
{
try {
websocket = new WebSocket(document.getElementById("wsURL").value);
websocket.onopen = function(evt) { onOpen(evt) };
websocket.onclose = function(evt) { onClose(evt) };
websocket.onmessage = function(evt) { onMessage(evt) };
websocket.onerror = function(evt) { onError(evt) };
}
catch(err) {
writeToScreen(err.message);
}
}
function CloseWebSocket()
{
websocket.close();
}
function FindWebSocketStatus()
{
try {
if (websocket.readyState == 1){
writeToScreen("Websocket connection is in open state")
}
else if (websocket.readyState == 0){
writeToScreen("Websocket connection is in connecting state")
}
else{
writeToScreen("Websocket connection is in close state")
}
}
catch(err) {
writeToScreen(err.message);
}
}
function FindWebSocketBufferedAmount(){
try {
writeToScreen(websocket.bufferedAmount)
}
catch(err) {
writeToScreen(err.message);
}
}
function SendMessageThroughSocket(){
doSend(document.getElementById("wsMessage").value);
}
function onOpen(evt)
{
writeToScreen("Socket Connection Opened");
}
function onClose(evt)
{
writeToScreen("Socket Connection Closed");
}
function onMessage(evt)
{
writeToScreen('<span style="color: blue;">SERVER RESPONSE: ' + evt.data+'</span>');
}
function onError(evt)
{
writeToScreen('<span style="color: red;">ERROR:</span> ' + evt.data);
}
function doSend(message)
{
try{
writeToScreen("CLIENT SENT: " + message);
websocket.send(message);
}
catch(err) {
writeToScreen(err.message);
}
}
function writeToScreen(message)
{
var output = document.getElementById("output");
var pre = document.createElement("p");
pre.style.wordWrap = "break-word";
pre.innerHTML = message;
output.appendChild(pre);
}
</script>
</title>
</head>
<body>
<table>
<tr>
<td>
WebSocket URL
</td>
<td>
<input type="text" id="wsURL" value="ws://echo.websocket.org/"/>
</td>
</tr>
<tr>
<td>
WebSocket Message
</td>
<td>
<input type="text" id="wsMessage" value="Hi"/>
</td>
</tr>
<tr>
<td colspan="2" style="text-align:left;">
<input type="button" value="Open Socket Connection" onclick="OpenWebSocket();"/>
</td>
</tr>
<tr>
<td colspan="2" style="text-align:left;">
<input type="button" value="Send Message" onclick="SendMessageThroughSocket();"/>
</td>
</tr>
<tr>
<td colspan="2" style="text-align:left;">
<input type="button" value="Close Socket Connection" onclick="CloseWebSocket();"/>
</td>
</tr>
<tr>
<td colspan="2" style="text-align:left;">
<input type="button" value="Find Socket Status" onclick="FindWebSocketStatus();"/>
</td>
</tr>
<tr>
<td colspan="2" style="text-align:left;">
<input type="button" value="Find Socket Buffered Amount" onclick="FindWebSocketBufferedAmount();"/>
</td>
</tr>
</table>
<div id="output"></div>
</body>
</html>
创建自己的套接字服务器也很简单只需安装 Node.js 和 socket.io 然后通过 npm继续安装Web套接字
#!/usr/bin/env node
var WebSocketServer = require('websocket').server;
var http = require('http');
var server = http.createServer(function(request, response) {
console.log((new Date()) + ' Received request for ' + request.url);
response.writeHead(404);
response.end();
});
server.listen(8888, function() {
console.log((new Date()) + ' Server is listening on port 8888');
});
wsServer = new WebSocketServer({
httpServer: server,
// You should not use autoAcceptConnections for production
// applications, as it defeats all standard cross-origin protection
// facilities built into the protocol and the browser. You should
// *always* verify the connection's origin and decide whether or not
// to accept it.
autoAcceptConnections: false
});
function originIsAllowed(origin) {
// put logic here to detect whether the specified origin is allowed.
return true;
}
wsServer.on('request', function(request) {
if (!originIsAllowed(request.origin)) {
// Make sure we only accept requests from an allowed origin
request.reject();
console.log((new Date()) + ' Connection from origin ' + request.origin + ' rejected.');
return;
}
var connection = request.accept();
console.log((new Date()) + ' Connection accepted.');
connection.on('message', function(message) {
if (message.type === 'utf8') {
console.log('Received Message: ' + message.utf8Data);
connection.sendUTF('Message received at server:'+message.utf8Data);
}
else if (message.type === 'binary') {
console.log('Received Binary Message of ' + message.binaryData.length + ' bytes');
connection.sendBytes(message.binaryData);
}
});
connection.on('close', function(reasonCode, description) {
console.log((new Date()) + ' Peer ' + connection.remoteAddress + ' disconnected.');
});
});
将上述文件另存为.js并从终端或命令提示符 node filename.js 运行
上面的文件就像我们首先使用节点创建了一个http服务器然后我们将创建的http服务器实例传递给Websocketserver然后传递给Socket.iO实例
答案 5 :(得分:1)
我正在调试一个类似的问题,并发现如果你使用https来获取网页,那么如果你使用传递,那么iOS将陷入困境:&#34; ws:&#34;协议到WebSocket。如果你使用&#34; wss:&#34;一切都会奏效,没有陷阱。