"Hi, I have the client and Udp server communicate with each other.Now im not getting the exception "The existing connection was forcibly closed by the remote host".This is because i have defined the server in a separate project." - Most likely because you are using UDP and not TCP (if thats what was used before) UDP doesnt care about "connections" etc, it just sends/recieves to/from endpoints. Not because you moved the server part into a seperate project... "The client is now able to communicate with 1 server at one ip and port.But i want the client to call another UDP server at another port but same ip.For eg:the client is communicating with udp server at port 10001.After every 15 secs the client should connect with the servers at different ports(10002,10003 etc)" - You will have to define another endpoint for the UDP sending socket (client) with a different port, tis all. If you still are having problems, please post up some code; it might help clear things up.

modified on Saturday, March 14, 2009 1:30 PM

No, but you could milk a heck of alot of information about topics if you designed a bot to do it for multiple forums/locations...

Original post:Guys, cant you tell a bot when you see one? EDIT: Correction! "Yo Member 3493799, cant you tell a human when you see one?" ;P

What protocol are you using?

Opening a good old Port may be the solution to many a networking problem ;-)

Cheers, that makes sense, will change it accordingly.

Used breakpoints, saw the values and they were correct. newText was highlighted in red though when I got to the" chatView.Text = newText" (dont know what that means: VS2008). myName = "test" myText = "ETST13245"

newText "\r\Test\0\0\0\0\0\0\0: ETST13245\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" string

Tried it, didnt work :( Heres the packet decoding scheme: myName = dataSender myText = dataMessage

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct rawCncPacket
{
// IP
public byte IPVerLen;
public byte IPTOS;
public short IPLength;
public short IPID;
public short IPOffset;
public byte IPTTL;
public byte IPProtocol;
public short IPChecksum;
public int IPSrcAddr;
public int IPDestAddr;
// UDP
public short UDPsourcePort;
public short UDPdestPort;
public short UDPLength;
public short UDPcheckSum;
// CNC
public int CNCpacketDirection;
public int CNCpacketNumber;
public int CNCpacketSource;
public int CNCpacketDest;
public short CNCpacketPort;
public short CNCpacketHeaderEnd;
// Data
public byte dataType; // 1
public byte[] dataSenderBytes;
public string dataSender; // 12
public byte[] dataMessageBytes;
public string dataMessage; // 24
public int dataPackOne;
public int dataPackTwo;
public byte dataPackEnd;

                public rawCncPacket(byte\[\] packet)
                {
                    // IP Header section
                    System.IO.MemoryStream stm = new System.IO.MemoryStream(packet, 0, 94);
                    System.IO.BinaryReader rdr = new System.IO.BinaryReader(stm);
                    IPVerLen = rdr.ReadByte();
                    IPTOS = rdr.ReadByte();
                    IPLength = rdr.ReadInt16();
                    IPID = rdr.ReadInt16();
                    IPOffset = rdr.ReadInt16();
                    IPTTL = rdr.ReadByte();
                    IPProtocol = rdr.ReadByte();
                    IPChecksum = rdr.ReadInt16();
                    IPSrcAddr = rdr.ReadInt32();
                    IPDestAddr = rdr.ReadInt32();
                    // UDP header section
                    UDPs

I know! Nothing works in combination. Heck, even when I remove the newline stuff and just have myName + myText, it only shows myName... weirdest thing ever..

Did you use Socket.beginAccept?

Below is my code to add a chat message to a multiline text box. I have tested the parameters, when I run them on messagebox's they output the proper value, but when I combine them: "chatView.Text = chatView.Text + Environment.NewLine + myName + ": "+ myText;" Only "myName" shows up on each line. What am i doing wrong?

public delegate void chatMessageCallBack(string myName, string myText);
private void chatMessage(string myName, string myText)
{
chatView.Text = chatView.Text + Environment.NewLine + myName + ": "+ myText;
}
private void addChatMessage(string myName, string myText)
{
if (chatView.InvokeRequired)
{
chatMessageCallBack d = new chatMessageCallBack(chatMessage);
Invoke(d, new object[] { myName, myText });
}
else
{
chatView.Text = chatView.Text + Environment.NewLine + myName + ": " + myText;
}
}

Just a note for anyone else who comes across this issue and sees this thread: The solution provided by Luc does NOT WORK with LayoutKind.Explicit, it only works with LayoutKind.Sequential, and with the FieldOffset()'s removed (obviously). This is the compiling + working code:

[StructLayout(LayoutKind.Sequential, Pack = 1, Size = 66, CharSet = CharSet.Ansi)]
public struct chatOne
{

                public int packetType; //4
                public int packetNumber; //4
                public int packetSource; //4
                public int packetDestination; //4
                public short packetPort; // 2
                public ushort packetInfoEnd; // 2
                public byte dataId; // 1
                \[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 11)\]
                public string dataSender; // 11
                public byte dataPadOne; // 1
                \[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 23)\]
                public string dataMessage; // 23
                public short dataPart; // 2
                public int dataEndCodeOne; // 4
                public int dataEndCodeTwo; // 4

                public chatOne(int dst, short port, string sender, string message)
                {
                    packetType = 1192961;
                    packetNumber = 0;
                    packetSource = 0;
                    packetDestination = dst;
                    packetPort = IPAddress.HostToNetworkOrder(port);
                    packetInfoEnd = 43521;                      
                    dataId = 10;
                    dataSender = sender;
                    dataPadOne = 0;
                    dataMessage = message;
                    dataPart = 206;
                    dataEndCodeOne = 10209786;
                    dataEndCodeTwo = 6658;
                }
            }

Thank you! It worked perfectly! Very much appreciated

I would suggest: 1. Finding the previously added button and setting the new X relative to that through iteration/foreach. 2. Referencing the last control in the Controls list (might be the last one) using the length/count of the list.

modified on Sunday, February 22, 2009 9:12 AM

Looks like your building buttons on top of each other. Isn't it always going to set the location to the same place for every button?

Getting compile (Overwritten area/contains Object field @ offset 21) I want a string that is of length 11 (sender) and a string that is of length 23 (message). Any help is appreciated; I cant see the problem. [StructLayout(LayoutKind.Explicit, Pack = 1, Size = 66, CharSet = CharSet.Ansi)] public struct chat { [FieldOffset(0)] public int packetType; //4 [FieldOffset(4)] public int packetNumber; //4 [FieldOffset(8)] public int packetSource; //4 [FieldOffset(12)] public int packetDestination; //4 [FieldOffset(16)] public short packetPort; // 2 [FieldOffset(18)] public ushort packetInfoEnd; // 2 [FieldOffset(20)] public byte dataId; // 1 [FieldOffset(21)] public string dataSender; // 11 [FieldOffset(32)] public byte dataPadOne; // 1 [FieldOffset(33)] public string dataMessage; // 23 [FieldOffset(56)] public short dataPart; // 2 [FieldOffset(58)] public int dataEndCodeOne; // 4 [FieldOffset(62)] public int dataEndCodeTwo; // 4 public chat(int dst, short port, string sender, string message) { packetType = 1192961; packetNumber = 0; packetSource = 0; packetDestination = dst; packetPort = IPAddress.HostToNetworkOrder(port); packetInfoEnd = 43521; dataId = 10; dataSender = sender; dataPadOne = 0; dataMessage = message; dataPart = 206; dataEndCodeOne = 10209786; dataEndCodeTwo = 6658; } }