[英]Connecting to UDP server from Nodejs
我已经用C语言编写了一个UDP服务器,并且尝试使用以下客户端代码从nodejs连接到它:
const dgram = require('dgram');
const server = dgram.createSocket('udp4');
server.on('error', (err) => {
console.log(`server error:\n${err.stack}`);
server.close();
});
server.on('message', (msg, rinfo) => {
console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
});
server.on('listening', () => {
const address = server.address();
console.log(`server listening ${address.address}:${address.port}`);
});
server.bind(3000);
服务器也在端口3000上运行,执行nodejs代码时出现此错误:
client error:
Error: bind EADDRINUSE 0.0.0.0:3000
at state.handle.lookup (dgram.js:242:18)
at process._tickCallback (internal/process/next_tick.js:63:19)
at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3
为什么会这样呢?
谢谢
也许您可以尝试以下代码,这将创建一个UDP客户端并将一条消息发送到您的服务器,我假设它位于localhost,端口3000上。
它还将打印任何响应:
client.js:
const dgram = require("dgram");
const PORT = 3000;
const HOST = '127.0.0.1';
const message = Buffer.from("Hey there!!", "utf8");
const client = dgram.createSocket('udp4');
client.on("message", function (message, remote) {
console.log(`UDP message received from: ${remote.address}:${remote.port} - ${message}`);
});
client.send(message, 0, message.length, PORT, HOST, function(err, bytes) {
if (err) {
console.error(`UDP message send error:`, err);
} else {
console.log(`UDP message sent to ${HOST}:${PORT}`);
}
});
如果愿意,也可以尝试使用Node.js服务器进行测试,这是来自Node.js文档的一些经过修改的代码:
server.js:
const dgram = require('dgram');
const server = dgram.createSocket('udp4');
server.on('error', (err) => {
console.log(`server error:`, err);
server.close();
});
server.on('message', (msg, rinfo) => {
console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
// Echo message back to client
server.send("I got a message from you: " + msg, rinfo.port);
});
server.on('listening', () => {
const address = server.address();
console.log(`server listening ${address.address}:${address.port}`);
});
server.bind(3000);
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