Question

我在Action Script 3中有一个UDP套接字程序，在Flash CS6中编译Adobe Air并且我一直收到错误

TypeError：错误＃1009：无法访问空对象引用的属性或方法。在Untitled_fla :: MainTimeline / fl_MouseClickHandler（）[Untitled_fla.MainTimeline :: frame1：64]

这是我的代码：

import flash.display.Sprite; 
import flash.events.DatagramSocketDataEvent; 
import flash.events.Event; 
import flash.net.DatagramSocket; 
import flash.utils.ByteArray; 

var datagramSocket:DatagramSocket; 

//The IP and port for this computer 
var localIP:String = iploc.text; 
var localPort:int = portloc.value; 

//The IP and port for the target computer 
var targetIP:String = ipto.text; 
var targetPort:int = portto.value; 

function DatagramSocketExample() 
{ 
    //Create the socket 
    datagramSocket = new DatagramSocket(); 
    datagramSocket.addEventListener( DatagramSocketDataEvent.DATA, dataReceived ); 

    //Bind the socket to the local network interface and port 
    datagramSocket.bind( localPort, localIP ); 

    //Listen for incoming datagrams 
    datagramSocket.receive(); 

    //Create a message in a ByteArray 

} 

function dataReceived( event:DatagramSocketDataEvent ):void 
{ 
    //Read the data from the datagram 
    trace("Received from " + event.srcAddress + ":" + event.srcPort + "> " + 
        event.data.readUTFBytes( event.data.bytesAvailable ) );
        rcv.text = event.data.readUTFBytes( event.data.bytesAvailable )
} 



sendbtn.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler);

function fl_MouseClickHandler(event:MouseEvent):void
{
var data:ByteArray = new ByteArray(); 
    data.writeUTFBytes(msg.text); 

    //Send the datagram message 
    datagramSocket.send( data, 0, 0, targetIP, targetPort); 

}

请帮帮我。

Answer 1

我认为ipto是一个动态文本字段，设置为＆＃34;输入文本＆＃34;但是什么是portto？

如果它也是动态文本字段，您应该尝试从中获取字符串并将其转换为整数。

var targetIP:String = ipto.text; 
var targetPort:int = (int)portto.text;

另外，请务必检查ipto和portto是否是实际的实例名称而不只是其符号名称。

我有时倾向于创建文本字段而忘记选择实例名称。

Answer 2

为什么呢？ - 因为你还没有调用DatagramSocketExample()函数。所以它没有设置addEventListener()和bind()这里有一些有效的测试代码。绑定到localhost 127.0.0.1和相同的端口，以便您可以看到它通过dataReceived()事件函数接收数据。

import flash.display.Sprite;
import flash.events.DatagramSocketDataEvent;
import flash.events.Event;
import flash.net.DatagramSocket;
import flash.utils.ByteArray;

var datagramSocket: DatagramSocket;
var localIP: String = "127.0.0.1";
var localPort: int = 1;
var targetIP: String = "127.0.0.1";
var targetPort: int = 1;

datagramSocket = new DatagramSocket();
datagramSocket.addEventListener(DatagramSocketDataEvent.DATA, dataReceived);
datagramSocket.bind(localPort, localIP);
datagramSocket.receive();

var data: ByteArray = new ByteArray();
data.writeUTFBytes("Test data");
datagramSocket.send(data, 0, 0, targetIP, targetPort);

function dataReceived(event: DatagramSocketDataEvent): void {
    trace("Received from " + event.srcAddress + ":" + event.srcPort + "> " + event.data.readUTFBytes(event.data.bytesAvailable));
}

UDP数据报套接字不通过并给出null错误

2 个答案: