C#udp发送接收问题

做一只好猿 2015-07-30 04:44:01

我现在的一个项目，是用C#UDP写的，我是主端，要求为了维持通信，我先发0给下位机。如果下位机收到，则回0给我，然后就这样从1一直发到255，即我发1，如果对方收到1，则再回给我1，然后我继续发2，一直到255，到255之后又从1重新开始，发送的内容为三个字节，第一个是1到255，后边两个字节时消息长度，也就是说如果长度大于三，则作为消息长度处理，以下是我的代码，现在问题是收到的数据不全，比如能收到1，就收不到2和3，求大神帮忙看看
private void ReceiveHandle1()
{
//接收数据处理线程
if (mySocket1 == null || mySocket1.Available < 1)
{
Thread.Sleep(200);
}
//接收UDP数据报，引用参数RemotePoint获得源地址
rlen1 = mySocket1.ReceiveFrom(receiveBytes1, ref RemotePoint1);
while (NormalFlag1 == true)
{
cirSendBytes1[0] = (byte)0; //先发0,如果对方收到0.并回复我0，则正常（纯通讯包）
mySocket1.SendTo(cirSendBytes1, cirSendBytes1.Length, SocketFlags.None, RemotePoint1);
if (cirSendBytes1[0] == receiveBytes1[0])
{
if (rlen1 > 3)
{
manualtransform(receiveBytes1, rlen1); //作为消息函数处理
NormalFlag1 = false;
break;
}
NormalFlag1 = false;
break;
}
}

while (RunningFlag1)
{

for (int i = 1; i <= 5; i++)
{
if (mySocket1 == null || mySocket1.Available < 1)
{
Thread.Sleep(200);
continue;
}
//接收UDP数据报，引用参数RemotePoint获得源地址
rlen1 = mySocket1.ReceiveFrom(receiveBytes1, ref RemotePoint1);

cirSendBytes1[0] = (byte)i;
mySocket1.SendTo(cirSendBytes1, cirSendBytes1.Length, SocketFlags.None, RemotePoint1);

if (cirSendBytes1[0] == receiveBytes1[0])
{
if (rlen1 > 3)
{
MessageBox.Show("成¨功匹配");
//manualtransform(receiveBytes1,rlen1);
convert1(receiveBytes1);
continue;
}
System.Threading.Thread.Sleep(50);//没什么意思，单纯的执行延时，一个周期为50ms
continue;
}
else if ((cirSendBytes1[0] != receiveBytes1[0]) && (cirSendBytes1[0] != (byte)0))//
{
MessageBox.Show("没?收º?到Ì?，ê?再¨´发¤¡é");
System.Threading.Thread.Sleep(200);//等待4个周期，看是否能收到，收到则继续，收不到则重发
// rlen1 = mySocket1.ReceiveFrom(receiveBytes1, ref RemotePoint1); //再收
if (cirSendBytes1[0] == receiveBytes1[0])
{
continue; //收到了
}
else
{
mySocket1.SendTo(cirSendBytes1, cirSendBytes1.Length, SocketFlags.None, RemotePoint1);//没收到，重发
}
}
else
{
MessageBox.Show("主¡Â端?复¡ä位?");
byte a = 0x01;
cirSendBytes1[0] = Convert.ToByte(cirSendBytes1[0] + a);
mySocket1.SendTo(cirSendBytes1, cirSendBytes1.Length, SocketFlags.None, RemotePoint1);//主端复位
}
}
}
}

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