node.js TypeError:Path必须是字符串。收到空

时间:2016-06-13 12:17:25

标签: node.js sockets

我最近在使用socket.io,node.js和express.js的javascript。 这是服务器代码。



var
    port = +process.argv[2] || 8080,

    sanitizer = require('validator').sanitize,
    express = require('express'),

    server = express.createServer(),
    io = require('socket.io').listen(server),
    chat = io.of('/chat'),
    canvas = io.of('/canvas')
;

function sanitize(string) {
    return sanitizer(string).entityDecode()
}

server.listen(port);

server.get(/(^\/.*$)/, function(request, response) {
    var fileName = request.params[0];
    if (fileName == '/')
        fileName = '/index.html';
    response.sendfile(__dirname + '/client' + fileName);
});

io.sockets.on('connection', function(socket) {
    socket.on('setName', function (name) {
        name = sanitize(name);
        socket.set('name', name);
        socket.broadcast.emit('receive', {
            sender:'Server',
            message:name + ' has joined.'
        })
    });

    socket.on('send', function (message) {
        socket.get('name', function(error, name) {
            if (name)
                socket.broadcast.emit('receive', {
                    sender:name,
                    message:sanitize(message)
                })
        })
    });

    socket.on('draw', function (command) {
        io.sockets.emit('draw', command)
    });

    socket.on('updateCursor', function(position) {
        socket.get('name', function(error, name) {
            if (name)
                socket.broadcast.emit('updateCursor', {
                    name:name,
                    position:position
                });
        });
    });

    socket.on('disconnect', function() {
        socket.get('name', function(error, name) {
            if (name) {
                socket.broadcast.emit('receive', {
                    sender:'Server',
                    message:name + ' has left.'
                });
                socket.broadcast.emit('removeCursor', name);
            }
        })
    });
});




我能够成功设置服务器,但是当我在浏览器上使用localhost时,出现以下错误:

  

TypeError:Path必须是字符串。收到null       在assertPath(path.js:8:11)       在win32.join(path.js:221:5)       在exports.send(C:\ Users \ Akshay \ Desktop \ whiteboard-master \ whiteboard-master \ node_modules \ express \ node_modules \ connect \ lib \ middleware \ static.js:127:20)       在ServerResponse.res.sendfile(C:\ Users \ Akshay \ Desktop \ whiteboard-master \ whiteboard-master \ node_modules \ express \ lib \ response.js:186:3)       在C:\ Users \ Akshay \ Desktop \ whiteboard-master \ whiteboard-master \ server.js:23:14       在回调(C:\ Users \ Akshay \ Desktop \ whiteboard-master \ whiteboard-master \ node_modules \ express \ lib \ router \ index.js:272:11)       在param(C:\ Users \ Akshay \ Desktop \ whiteboard-master \ whiteboard-master \ node_modules \ express \ lib \ router \ index.js:246:11)       传递(C:\ Users \ Akshay \ Desktop \ whiteboard-master \ whiteboard-master \ node_modules \ express \ lib \ router \ index.js:253:5)       在Router._dispatch(C:\ Users \ Akshay \ Desktop \ whiteboard-master \ whiteboard-master \ node_modules \ express \ lib \ router \ index.js:280:5)       在Object.Router.middleware [作为句柄](C:\ Users \ Akshay \ Desktop \ whiteboard-master \ whiteboard-master \ node_modules \ express \ lib \ router \ index.js:45:10)

我使用不稳定的v0.5.8 windows二进制版本的节点开发了这个。 但我目前正在运行4.4.5版本。

请帮助我,我哪里出错了?

1 个答案:

答案 0 :(得分:0)

从您粘贴的示例代码中判断一下有点困难,因为您的堆栈跟踪引用了index.js中的第45行作为问题的来源(C:\Users\Akshay\Desktop\whiteboard-master\whiteboard-master\node_modules\express\lib\router\index.js:45:10)但是当我查看您的示例/时在IDE中粘贴代码,它没有做任何事情。对sendfile的唯一调用(在堆栈跟踪中进一步引用)在脚本中较早。

假设这是您问题的位置,您应该console.log()或以其他方式调试您尝试发送给访问者的路径/文件名的值。请注意,在Windows中,路径分隔符为\而不是/。您应该使用path.join()来形成所服务文件的最终路径。 ExpressJS的例子说明了这一点:

app.get('/', function(req, res) {
    res.sendFile(path.join(__dirname, 'index.html'));
});