private void Capture_task()
{
try
{
IntPtr adhandle = packet_capture.InitCapture();
int count = 0;
int temp_sec = 0, temp_usec = 0;
while (iscapturing)
{
Packet_Info temp = packet_capture.CapturePacket(adhandle);
if (temp == null)
{
continue;
}
if (count == 0)
{
temp_sec = temp.tv_sec;
temp_usec = temp.tv_usec;
}
temp.Time = temp.tv_sec - temp_sec + (float)(temp.tv_usec - temp_usec) / 1000000;
temp.Number = ++count;
Dispatcher.BeginInvoke(new InsertPacket(packets.Add), temp);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
public static Packet_Info CapturePacket(IntPtr adhandle)
{
int res;
IntPtr pkt_data = new IntPtr();
IntPtr header = new IntPtr();
res = pcap_next_ex(adhandle, ref header, ref pkt_data);
if (res == 0)
{
return(null);
}
if (res == -1 || res == -2)
{
StringBuilder errbuf = pcap_geterr(adhandle);
throw new InvalidOperationException(errbuf.ToString());
}
pcap_pkthdr header_s = Marshal.PtrToStructure <pcap_pkthdr>(header);
byte[] packet = new byte[header_s.len];
Marshal.Copy(pkt_data, packet, 0, header_s.len);
Packet_Info temp = new Packet_Info(packet, header_s.tv_sec, header_s.tv_usec);
return(temp);
}